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About MXKyle

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    TT Silver Member

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    Adventure Racing

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  1. MXKyle

    Convert a 2018 YZ450 -> 2019 YZ450

    No way of knowing for me because I don't have a part break down that goes below the cartridge assembly itself. I do know the entire cartridge is different to the point that it is not a drop in change. They added a second O-ring groove at the top and that changed the length of the cartridge. I swapped the shim stack assembly, the plastic sleeve and the spring from the 2019 to the original 2018 cartridge. Took about a minute after I saw what was needed. After that its as easy as any fluid change.
  2. MXKyle

    Convert a 2018 YZ450 -> 2019 YZ450

    Yes, the spacers are cheap so why not swap them. Actually, only one side changed so you only need one. As a Vet Expert I personally couldn't tell the difference but maybe if you are a pro you can. I also updated the forks compression shim stack (cost a lot more) to the 2019 variant. This was golden. Made it a whole new bike. With the 2019 cartridges my 2018 is by far the best bike I have ever ridden. I did the cartridges first and tested before changing the spacer so I would be able to know how much each change affected the handling. As I said, I felt no difference when I swapped the spacer but it was already at the 'incredible' level so I'm happy. __KT__
  3. I'm now using a Just1 full carbon. It's the most comfortable helmet I have ever put on. Like most good helmets you can buy different size cheek pieces for custom fit. KT
  4. I'm not a Honda guy but if I was you I would go with a CR500 engine. When you get done I want to ride it!!!! KT
  5. MXKyle

    Should I adjust the 2018 yz450f forks?

    I just had this argument with a buddy that picked up his new 2018 YZ last week. He didn't like how his bike was handling on the first day out but he insisted that he wanted to ride the bike and break in the suspension before adjusting it. I told him he was nuts and should have made the changes I recommended from my one years experience on the bike before he ever started it up. After the argument I did convince him to at least check the shock sag. It was 130mm because he weights 230. I have no doubt his bike handled like crap. He will probably need stiffer springs. At least set the sag before riding. It effects every part of how that bike handles. You may have to adjust it again when it is broke in but it is worth the extra effort. I also would start with the forks set to what Motocross Action recommended. KT
  6. MXKyle

    2018 yz450f handling issues

    Heal up fast and get back on that bike. I spent months trying to tune that feeling out of my bike with no luck. It wasn't really noticeable on hard pack but in loose disturbed dirt the bike wasn't confidence inspiring when dropping in and seemed a little squirlly on exit when under power. When the 2019 came out and won all the shootouts I decided the only real change was the fork valving so I bought just the 2019 cartridges as soon as they became available. Turned my scoot into a new bike! Absolutely killing all the turns now regardless how they look and took seconds off my lap times. So in my opinion to make it a great bike the 2018 forks need revalving . Either pay a competent shop or fix it yourself like I did. __KT__
  7. MXKyle

    YZ 450 DIET no thanks

    Exactly why I made the statement that the steel frames were lighter. I automatically made the assumption but would rather have found some printed backup than a calculation because I know most don't have the background to understand it. You obviously do. BTW - I feel kind of foolish being schooled on materials. I'm a working senior mechanical engineer and I spend a good bit of time doing structural analysis for fatigue limits. I am currently designing training simulators and other goodies for the F35 that require lots of structural analysis to prove they will be safe throughout their 20 year life cycle. --KT--
  8. MXKyle

    YZ 450 DIET no thanks

    The problem with regurgitating things I've read over the years is that someone is likely to call me on it. Then I have to go and do actual research. A quick search shows the KTM and Husky are indeed using chromoly steel which is 41xx. Not sure which alloy. Comparing the weights of the aluminum vs steel bike frames has been discussed at length here at Thumpertalk. I'll look around and see if there is any real data to back up what I thought were facts. At any rate KTM is touting that the frame on their new 250F is 2.2 LBS lighter than the lightest aluminum frame of their competition. But you are right that Aluminum is 1/3 the weight and 1/3 the strength of steel so the frames should be about the same weight to achieve the same strength and durability. Within a couple of pounds I guess. That is why I point to the engine as the place Yamaha needs to try to remove the weight and get closer to the KTM/Husky. --KT--
  9. MXKyle

    YZ 450 DIET no thanks

    Found it in the MXA archives: Q: HOW RADICALLY DIFFERENT WAS THE 2005 YZ125 ENGINE FROM THE 2004? A: They only shared two parts, the kickstarter and clutch plates. Everything else was ash-canned. Yamaha’s goal was to build the lightest 125 two-stroke possible and since the engine was the heaviest part of the motorcycle, it was the best place to start. The 2005 YZ125 engine was four pounds lighter than the 2004 YZ125 engine. That’s impressive. Q: HOW CREATIVE WAS YAMAHA’S ALUMINUM FRAME AT THE TIME? A: It’s was a work of art. Yamaha wasn’t gung-ho to jump on the aluminum bandwagon. They had a steel frame that was good. Their bikes had class-leading handling. They didn’t want to play follow the leader. According to inside sources, before Yamaha’s engineers could switch to aluminum they had to prove that there wouldn’t be any depreciation in strength, handling or feel. Weight savings was the big carrot. Yamaha eschewed the ubiquitous Delta Box twin-spar design and, instead, opted for a very innovative plug-and-play aluminum frame that mimicked a steel frame, but did it with only eight separate pieces. There isn’t a single tube on the 2005 frame. It uses forgings, castings and extrusions. The 2005 Yamaha YZ125 frame was 4-1/2 pounds lighter than the 2004 frame. The 4-stoke engine is physically a lot bigger than the 2-stroke engine and in my opinion can more easily shed weight than the 2-stroke did back in the day. --KT--
  10. MXKyle

    YZ 450 DIET no thanks

    I had a 2003 125 then a 2005 and bought a 2006 just for the fork improvement. Yes, I recall the frame was slightly lighter but the motor was incredibly smaller and lighter on the new generation 2-strokes. I remember the magazines harping on how much weight was reduced due to the motor redesign. Not sure if those articles are still around. I'll try to find one. They also say now that aluminum frame is one of the main reasons they can't get the weight down to the KTM/Husky level today. The aluminum frames are much heavier than the mild steel ones. At least that is what they say. I have personally never weighed one. --KT--
  11. MXKyle

    YZ 450 DIET no thanks

    How can anyone not say, "Lighter would be better"? I have ridden the new KTM and I just couldn't get comfortable. I tried the new KX too. The KTM was noticeably lighter but not better for my height, weight and riding style. Not better for me but obviously better for many others. I went with the 2018 YZ because I was instantly comfortable which I think is most important. That being said I am disappointed it is so heavy. I fully believe it can be 10 LBS lighter. I had the engine completely apart on a YZ450 a couple of years ago and was astounded at how much extra aluminum is in there. I keep waiting for Yamaha to do the same engine reducing effort that took 12 LBS off the 2-strokes 14 years ago. Those bikes didn't instantly become less durable. Hell, I still have a 2006 YZ125 that I thrash every once in a while and it remains bulletproof. They had used the same basic engines for 15 years and then poof they were 10 lbs lighter. Please do that for the 450! Kyle T.
  12. Everyone asking these questions should start by telling us their weight and riding level. Those two pieces of information completely change the setup for each rider. Smacker undoubtedly is a lot lighter than I am because a softer spring simply wouldn't work for my, ahem, mature physique. --KT--
  13. MXKyle

    Crate 2018 YZ450 Setup

    I picked mine up in the crate too. As a long time Yamaha guy I know that the pivot points just don't come with enough grease. I took the time to grease the swing arm pivot, the rear shock linkage and the steering head bearings. I also popped the seals off the front wheel bearings and filled them with waterproof grease. I also oiled the filter to make sure it was good. Like almost everyone I am running 105mm of rear sag and raised the forks 5mm in the clamps. I have already forgotten what I settled on for fork and shock settings but I will look them up when I get home. It took a bit for me to get the bike to really bite in the turns but it does now and it is unreal how much fun I am having. _EDIT_ I tried both Keefersinc and the Motocross Action as starting points but couldn't get the bike to feel like it was planted in the turns. It just felt like the front end was loose as I was dropping into the corners. Actually, it was good but not great. Eventually, I went in one click in on the slow speed compression on the shock (something Keefersinc and Motocross Action didn't do) and suddenly I had a great turning bike. So I am a 190 LB vet expert motocrosser and I am really happy with the forks at 9 out on the compression and 10 out on the rebound. The shock I have set at a 1/4 turn stiffer on the high speed compression and 1 click harder on the slow speed compression. The shock rebound I left stock. I had a 2014 and really liked the Travis Preston map so I dialed in the 2018 Preston map before even starting the bike and have been very happy with it. --KT--
  14. MXKyle

    2018 supercross yz450f

    I've had to spend a lot of time with lawyers lately and I'm afraid some of it rubbed off.
  15. MXKyle

    2018 supercross yz450f

    I'm a mechanical engineer myself and I hate when people say they are engineers without giving their specialization. Engineers are trained in distinct specializations. In our office we have all the different disciplines and they are all great at their focus but each has to rely on the other disciplines to make a capable product. We also have to keep the different disciplines separated to keep them from fighting. So just saying you are an engineer leaves out too much information. So just for the record, what kind of engineer are you? --KT--