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Found 120 results

  1. Wow, it's been a few years since I've been on here. Glad to see old farts like greyracer are still on here helping guys out. I recently had an experience that I had to pass along though so I thought I'd log in here and see what's up. I was going through one of my favorite bikes, my "old" '06 YZ450. (I recently rode a couple '17 KTM's and it made me appreciate my YZ even more.) While I was freshening up the suspension, I thought I'd lower it a little bit in the process. I've always been happy with the suspension on that bike so I didn't want to go crazy with big changes, just a little tweaking. Anyway, I needed some shock oil and seals and I wanted to see if anyone local had any in stock. (Something that is getting harder and harder to do. For the local SF Bay Area people, we just lost Zoom Cycles, THE go-to parts and accessories store for the last 45 years.) I do a little google searching and find Dave Johnson of Smart Performance is local to me. I give him a call and sure enough, he has everything I would possibly need for any suspension work I wanted to do. He puts together an order and I drive over to pick it up. I'm greeted by an obviously VERY intelligent, articulate, helpful and nice guy. I show him what I'm doing and he gives me tons of ideas and suggestions. I leave with everything I would need to build the shock and fill it with oil and nitrogen myself. The next day I realize that having a guy that's done hundreds, if not thousands of shock rebuilds purge the oil of bubbles in a vacuum chamber he built just for that purpose would probably be better than me trying to do it myself. I asked him if he would vacuum and charge the shock and he said no problem, bring it down! When I went back to have him do the shock, I also brought my fork parts to ask him about lowering ideas. Again, he gave me a ton of excellent information and some upgrade parts to put into the forks in the process. I left with a filled and charged shock in my hand that I had 100% confidence in it being filled perfectly with all air purged properly. I then spent some time on my lathe making a couple spacers for lowering the forks. Just for the h#ll of it, I thought I'd send him some pictures of what I came up with. AGAIN, he gave me his invaluable input and suggestions and it pushed me to make another set of spacers that I could be absolutely positive would work perfectly and dependably. I'm generally a pretty independent thinker and worker. When somebody influences me to be BETTER than I think I can be or do, that impresses me A LOT. Dave's suggestions and thoughts "pushed" me to do a better job and come up with a better final solution. For that, I wanted to return the favor by letting everyone know my personal experience with Dave and Smart Performance. I know this won't come as a surprise to many here, but I just thought I'd share anyway. I'm a HUGE fan of smart people openly sharing knowledge, and Dave is absolutely one of those people. Thanks Dave! John (aka gmtech16450yz everywhere else on the web. Google search that or "john's sky redline".)
  2. So I have a 2007 Yamaha YZ450f that I bought a few months ago. I took the bike out to desert for the first time, it was running PERFECT I was riding it for about 30 minutes and then all of a sudden it just started popping and was backfiring no matter what RPM I was at. I came to a stop and it just died, I started it up again, and I found the only way to keep it alive was by using the throttle. When I got home (sea level) I looked at the carb and noticed that the fuel screw fell out and was MISSING! I figured it must have fallen out while I was riding, So right away I bought a new Factory Effex fuel screw. When my new fuel screw arrived I installed it, and adjusted it 2 turns out. When I started the bike up with the new fuel screw, NOTHING CHANGED the motor wouldn't idle unless I had my hand on the throttle and was constantly backfiring on every RPM. So now I have the carburetor removed and taken apart, I could clearly see all the jets were clear. There is one thing that I noticed, a piece inside the carburetor was chipped off. When I took apart the carburetor the chip never fell out so I'm assuming whoever was working on the bike last must have dropped the carb and chipped it. After that I unscrewed the sparkplug, the sparkplug came out WET with fuel, figure this is due to such a rich mixture. I'm beginning to think that when the fuel screw fell out a piece of dust may have gone in it's hole and gotten into the circuit. Here's a picture of that chipped piece I was talking about. The fuel inlet needle looks good
  3. Do an average rider feel any difference riding a 2014 vs 2015 !? is there any big plus buying 2015 or even 2016 model compare to 2014!? I had sold my 2011 yz450f , and tried couple of other manufacture bikes, but at the end i am getting back to YZ . now i need some advice from experts : i have 2 option : either buying a 2014 around 2900SEK(3600$) or a 2015 yz450f for 34000SEK(4200$) . should i go for 2015 or just save money by buying 2014 model !?
  4. My bike has been running noticibly hot latley, then I noticed my coolant was low. This is the first time I've had to change coolant on my Yz450f and I'm not sure what I should go with. I have some Preston 50/50 lying around, but I'm not sure how safe that is for my bike. I've heard good things about engine ice and water wetter, but I want something that is available locally. Also, I live in south Florida where it is always hot, so I don't need a coolant that goes very low below freezing. Thanks for the help.
  5. With an all-new engine, new frame, new bodywork, electric start, power tuner smartphone app and more, YZ450F is ready to take motocross to a whole new level! The 2018 Yamaha YZ450F, you and your bike connected as one. http://yamaha.us/YYZ450F
  6. My friend bought a brand new Yz450f and he said he started noticing a scratching sound coming from the front brake science day one. According to him, overtime his front brakes have gotten worse and worse. Currently the brake lever can almost touch the grips when you pull it making it feel "squishy" and it brakes pretty bad. I tried to help diagnose the problem but I don't know much about brakes. Any ideas of what it could be? Thanks in advance.
  7. So, since I got this 2005 YZ450F a few months ago, it's had a bad hot restart issue. Cleaned the carb and replaced the a/p diaphragm and it was better for awhile, but every once in awhile would still fall on its face and not want to restart. Then 2 weeks ago in Moab, I had a horrible hot stall and restart problem. So, when I got back I went and did my valve adjustment and every thing is in spec now. Cam marks, and flywheel marks all line up, chain and tensioner were in good shape so reused. I researched the jetting section of this forum, and have dropped from 165 main to a 160, 45 pilot to 42, and stock NFLR needle from clip position 4 to clip position 3. Fuel screw 1.25 turns out. Now throttle response is good, except a little flat off closed idle. Weird thing is now when I hit the kill switch, 2 seconds after the motor stops turning, it shoots a flame past the spark arrester. Also when revving, there is a single loud pop when closing throttle, but not much popping when riding on decel. I figure that is because the pilot is still too fat and should be dropped to a 40 or 38. Despite making all these changes for the better, the stalling and restarting has gotten worse. Today was my first ride since the valves and jetting, and she was running great! Best midrange response it's had. But then out of nowhere after an hour or so of riding. It kept stalling for no reason, and was acting very weird on restarting. It was as if the plug had fouled, but it was a brand new plug. After several minutes of kicking, finally restarted. Went back to the truck and took a break, and didn't want to restart. Finally got it started and ran fine for 10 minutes, then stalled on a trail going downhill like I hit the kill switch. Rolled for 20 feet still in gear and it never restarted. Was stranded in the back field of my local track for 20 minutes, finally got it restarted and got back to the main area. Went to do a lap on the track, and as I was pulling on, same thing, just fell on its face. Also, many times while kicking, bike would fire for a few revolutions, then nothing for another 10 kicks. So does this sound like the ignition coil is crapping out? Always runs like an angry ape after initial startup, pulling the front wheel no problem and great throttle response.
  8. Hey everyone , I have a few basic questions that I have researched a bit but wouldn't mind a second input from anyone that has one. my bike is 2016 yzf450 60th anv, Before this when I was a teen I rode a 125 among other things such as be narly quads and fast fast skidoos. Im not a new rider just been out of the dirtbike scene for 5 years. so far my upgrades are just: -aftermarket foot pegs -renthal intellilever gen 2 unbreakable clutch/ front brake with perch (some how I managed to brake both within the first week but warranty replaced them) -bark buster jet handgaurds (to not have the levers snap on me again) -some black engine plugs -aftermarket grip seat and I bought the tuner. hour meter so mostly just cosemetic to this point. First question is me being 6 foot, 215 can the stock suspension be adjusted properly for me (I ride trails not tracks but do hit the odd jump) or what should I invest in? For an aftermarket exhaust what are the few I should have my eyes on? is a recluse a good option seeing as I do hit the trails 90percent of my riding ? My 450 does want to stall anytime I'm not riding it hard. Or is a heavier fly wheel a better option? Will either one mess with the snappy power ? I think I just need more seat time but I get insane pump from my bike enough to numb my hand slightly. I'm thinking of changing my grips to some softer ones but is there anything else I could attempt to do to fix this or just get on it and ride more any other mods and parts I should invest in? Basically have the luck of having the money to really make this bike complete and set up for me just need some guidance. thanks for the read and any tips or instructions !
  9. I start my motocross challenge with 2011 YZ450F . although i had many years experience with heavy cubic MC , from the first start i underestand it have so much power . and the first try MX track was scary and i decide to sell it . but as i am a stubborn person , i keep pushing and learning whit this bike . + mapping it as soft as possible and now i am getting better . last weekend i tried a rmz250 and was amazed how well i can drive it, but i didnt like it there was no power in it . now i need help : my friend suggest me to change to a 250 2 stroke : so how dose it feel to change from 450 4t to 250 2 stroke !? it is getting even harder !? or should i just not give up and keep pushing and learning with a 450 !? or maybe i just go to 20 4 stroke !?
  10. Dear friends, my bike is running perfectly the first 30-45 mins. Then it begins not being able to hold idle or low rpm's. It goes down and up between 1500 and 2100 rpm, and most of the times it dies. I did valves adjustments, replaced the Fuel Pump, ECU (CDI), HV coil, stator, spark plug, kill switch and checked the gas cap vent. I had my Power Tuner connected during a ride and as soon as the issue arises I checked the S/D error code, but it is always 0. I also cleaned the Air filter, all sensor connectors and let the injector to be cleaned by a professional. My mechanic ran out of ideas. We guess it is either electrical or fuel (!) related. Somebody told me to check the Fuel Coil (?), located under the seat on the frame, but I've never seen one there and perhaps this relates to a 2014 model!?. I suspect also the Air Pressure Sensor, and since it is the same as the Atmospheric Sensor I interchaged them and will check it today. Thanks for any possible hint. Regards from Temuco, Chile, Gerardo
  11. I am racing the Baja1000 for the first time this year on a team. All of the guys I am racing with have years of experience and have raced on teams and iron manned the race. Most of the guys I will be racing with have KTM or Hondas but I myself have the 2010 Yamaha YZ450F. I am looking for any recommendations on setting the bike for baja. I am an advanced rider, my style is somewhat aggressive, I weigh 180lbs and am 6'1. I am looking to maximize my fuel capacity, connect a light, kickstand, and tires. I am curious about gearing, and mapping for the bike as well as any other ideas you want to throw my way.
  12. Hey guys I was wondering what bike I should get I havnt rode since I was in 7th grade but I had a kx 85 so I was experienced with riding I could pin the bike on tracks so I'm not completely new to riding now I'm 6,2 190 I was contemplating what bike to get, should I go with a yz 125 or should I go with a yzf450, I would never sell the 450 prob have it forever thank you tell me your opinions plz!!
  13. Hi Folks! I decided that I am tired of my 06 WR250F having horrible damping (i.e. none at all) and so am going to upgrade the suspension. My questions for you are, 1. Is it worth it, given the age of the bike and cost of the parts, to find old 06-07 YZ250F SSS twin chamber forks and shock and rebuild/upgrade them, or just install a gold valve or similar in my single chamber WR forks? I like the idea of bolting on YZ TC forks and shock, but the cost at this point for them both runs about $500-$600 and they are guaranteed to be clapped out and need a full rebuild/upgrade, just like my WR forks/shock. 2. Race Tech offers a compression gold valve available, but not a rebound gold valve. Can you tell me why this is? I would like both, of course. 3. Will YZ450F components work as well? If so, what year range? 4. Ohlins drop in cartridges look awesome, but front and rear would cost the worth of the bike ;-) Thank you for the help!
  14. Hi All, I have run across an interesting bike trade that I would really like some guidance/feedback/opinions on. First, let me give you some background on my riding style and type of terrain we (myself and my boys) ride on. I am the type of rider that feels like I can go faster, jump higher and turn better, watching Supercross on Saturday nights only makes it worse, but in reality, I am a weekend basher. We ride mostly at local (Tampa) MX tracks (Tampa MX, Ocala Hardrock, and Spyder Mx) along with some trail riding on our 50 acer property here in tampa. I am planning to add a few jumps and berms to the trail track to make it more fun. My son's are very similar, but less fearful on getting hurt. They can get hurt and not negatively affect the income for the home. Needless to say, we like to have fun and use MX as a bonding sport for all of us. Now, I would say that my role has turned more into the family/friend mechanic. We have bought a sold 12 bikes in the last 14 months, so I do like buying a bike, resurrecting it, making sure it is mechanically sound and looks good. It then gets sold, and I move on to the next one. Consider it therapy for me! I recently picked up a 2011 YZ450f, and I really like the bike. The 450 completed the "Class" trifecta for us (2007 CR125r, 2014 KX250f and the YZ450f). However, I have always has a soft spot in my heart for Hondas. I have found a 2015 CRF250r that looks like it is in really GREAT condition, almost equally as the 450 I have (still have to take a look at it). He is interested in trading for the 450. I know that bikes go through their "great" years and "not so great" years. How is the 2015 CRF250r? Reliable? Good reviews? Is the 2015 a year that was awesome or one to stay away from? 2015 CRF250r - Pretty stock except the full dual Yohsi Exhaust system (rs-9), protaper bars and some ubreakable levers. Other than that, it is mostly stock, minus a few cosmetic upgrades. 2011 YZ450f - Pretty stock as well except the Yoshi slip-on silencer, brand new chain, works connection radiator braces, rebuilt suspension, all new plastics and graphics (arrive tomorrow). Bunch of cosmetic upgrades. Would you personally consider trading a 2011 yz450f for a 2015 CRF250r? Thoughts? Thanks in advance!
  15. Looking for some help. I want to convert my 2010 Yz450f into a road legal enduro bike and was wondering if anyone on here has done it and can shed some light on the conversion. I have already applied for the v55/5 and waiting on a dating leter and nova check to be sent to me from Yamaha. I need to get the bike ready for an MOT and it is currently just an MX bike with a pro moto stand. If anyone could supply me with a list of the exact parts I need which would fit the bike would be a great help. Cheers, Lewis.
  16. i have a 2004 yz450f and i am having issues with my clutch, i have to float the gears to ride it because the clutch wont work at all, i dont know whats wrong with it, i tore apart the clutch basket and all the friction plates look fine
  17. Oh... Just a video of me disposing of a dry rotted Michelin Starcross.
  18. i have a 2013 CRF450R and for next year i wanna buy a 2016 bike . 2016 honda is off my list . i am looking for a 2016 yz450f or KX450f . my heart is with YZ450 , but from people around and magazin comment i am wondering if it is a good choice !? dose it realiy feel heavy in front and steering into corners is a big problem !? is KX450f really better !? what is your experience with YZ450f !? which one should i buy !?
  19. So I stripped one of the screws on my reservoir cap for my front brakes. Anyone have any techniques for taking stripped screws out? I'm planning on replacing the whole reservoir cap with an aftermarket one, but I still need to get of the one I have on now. Thanks The aftermarket cap if anyone was curious: http://www.motosport.com/ride-engineering-front-brake-reservoir-cap?mmy=yamaha;yz450f;2017
  20. Reasons that i loved my yamaha : Two weeks ago I bought a 2013 CRF450R . after riding it for couple of time , i do miss my ex-YZ for couple of reasons: 1. its powerful engine , specially in low end 2.how easy and good the clutch was 3.its easy to change map on yamaha with GYTR power tuner 4.for me its a better looking bike compare to other brands. 5. yamaha forums of course in compare to my YZ , the CRF450R is superb in handling and easy to ride . i miss my yamaha low/mid end torque , but i am still fast with honda or even ridding better with honda. it feel like a 250 in the wood and trails, but the biggest problem for me is how stiff is the clutch ( i have a new clutch cable and OEM clutch spring). one thing that i do really appreciate is this forum, which is more active and i usually get response to my posts and questions .
  21. I’m sure there are questions about this already, but I am in a hurry to buy a set of Warp 9 supermoto rims for my 2009 Wr250F. However, the rims came off of a 2009 Yz450F and I’m not sure if the hubs will fit on my Wr. Any help is appreciated. Thanks!
  22. Okay so ever since I bought the bike a few months ago it always started up 1st try as long as I was at TDC (obviously I'd miss it sometimes so sometimes 2-3 kicks). The bike runs perfect is what I am trying to get across. Last night, 5/22/19 bike was running perfectly, and towards the end of the night (30mins before track closed) I went to truck to take a break and jumped back on it and it wouldn't start. So weird... So kicked a few more times, nothing. Waited around 20mins and tried again, still nothing. I dug further and decided to check the spark on the spark plug, spark plug looked like shit for one (see attached images) and I tried to get a spark out of it and I couldn't, bought one from AutoZone for $5 and came back and tested spark, saw a spark, great, put together bike and tried to kick a few times, nothing... So I ended up checking the valve clearances and they seemed fine and in spec Put everything back together again and at this point I was like hm... lets see what happens if I put a little bit of gas, about 1/2 of the top of a water bottle worth into the cylinder. Put the sparkplug back in and kicked it once and it started! Left it on for a few minutes to let it idle / rev it a little then I shut it off, re assembled the rest of the bike then sat back down on it once I was done and kicked it and started up first try again. So my question is, why all of the sudden did it start to seem perfectly fine?? Did that little bit of gas somehow unclog something along the way when it fired up the first time? I was just so confused because I really didn't do anything except replace the spark plug.
  23. I’ve got my 18 yz450f with a camso snowbike kit on it and it’s ran with no issues all season. This last ride the starter was being funny and the starter clutch went out. It was running perfectly fine before then. I got a new starter clutch in and went to fire it up and it just cranked and cranked and cranked with no start. I pulled the spark plug and it has good spark. I removed the fuel line and checked the pump and the pump is working fine. I tried starting with the cold start switch on and off. With the throttle at full and without touching it. I’m at a bit of a loss, the bike started and ran perfectly fine 2 weeks ago just before I replaced the starter clutch. I have been very good with maintenance on this bike, oil changed every othe snowbike ride and filter changed with it. I have a snowbike intake on it’s just a filter sock on an open tube(this has been on all season without issues). There are no codes showing on my app. any help? Im not sure what to check next. I need to get this fixed so I can ride it Saturday lol.
  24. I own a 2008 Yz450f and the bike only leaks fuel out of the overflow at the bottom of the carb when the bike is running. I have worked on a lot of bikes and done my fair share of carb work and I can't seem to figure this one out. When the bike sits with the fuel on it never leaks and when I take the bowl off and push the float up and turn the fuel on the needle keeps the fuel back so the needle isn't the problem and the float is not too high or it wold leak when the big is shut off. It didn't leak before and I took the carb apart to do some jet work and it has leaked ever sense.
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