Jump to content
Sign in to follow this  

fouled spark plug ??? 2010 sxf 450

Recommended Posts

Well 2nd ride today got to the track hit the e-start, choke for a second turned off the choke and the bike spit and puttered then just quit. Took about an hour to find the problem and found my plug was fouled, very wet. Whats up with that on a 4 stroke, never had that happen on any of my 4 strokes in 5 years, all Jap bikes? I seen this on a 2 stroke, pretty common, but not a 4 stroke. Motor has a bout 4 hrs on it now. I did change the pilot jet to a 45 from the factory setting, it was way to lean, should I go back now thats it's broken in?

Thanks...

Share this post


Link to post
Share on other sites

The #42 PJ isn´t too lean at all. Do this test ; Try to start your bike (with the #45 PJ ) without the choke the first time you start it for the day . If it starts then your PJ is too rich. Where did you get the idea the #42 PJ being lean in the first place ?

Share this post


Link to post
Share on other sites

The mechanic at the dealer put it on. He took it out in their field out back of their shop came right back and slapped a new pilot jet in. You think its running to rich now and that's what fouled my plug after break in?. I'll tell them to put the stock jet back in or I'll do it. It was popping "bad" when he 1st rode it and would not idle at all, just FYI. The 45 pj seemed to help at the time...

Share this post


Link to post
Share on other sites

Hey Villie,

Update, won't start without the choke on. "cold" didn't need the choke the rest of the day after it was warmed up.

Share this post


Link to post
Share on other sites

Put the #42 PJ back in and check the fuel screw. Open it to 2 turns out. And give that "mechanic" a kick in the ass next time you see him. Since that expert has been the one working on your bike there´s a change there´s some dirt in the carb. Plastic shavings from the tank or something. Something that a real mechanic is supposed to check out before the shop delivers the bike. I would clean the carb thoroughly before changing to correct PJ. That´s actually job for that mechanic but maybe it´s better you do it yourself.

Want to make your bike run like Champ ? Get a JD kit for it. No more quesswork if the jetting is correct or not.

FYI - i live in Sweden and i´ve ridden my bike countless times in zero /sub zero celsius temps (cold enough so i need to cover the rads to get my bike in running temp) and there´s never been any reason to change over to #45 PJ eventhough the weather sure is colder than what you ever get over there in FLA. So i can´t imagine you needing to do that either.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

  • Similar Content

    • By Urbanpoacher
      Hello everyone, I am new to the page and to the world of ktm. I recently purchased a used 2008 ktm xcfw with a 300 big bore kit, not sure who made or installed the kit. I am looking to see if there is any way to buy a new carb that is set up for this bike with the 300 BB. Any help would be great. The fuel inlet is leaking and there are a ton of stripped screws so I’m thinking getting a new carb might be the best way to go but i don’t really have the skill or knowledge to tune and jet a stock one myself. Thank you!
    • By christophe19912
      i am currently checking valve clearance on 2013 sxf 250 with 70 hrs. bike was bought new and never been apart(as far as i know). when setting TDC the notch on the crank when it is aligned to the whole, has the cam gear marks intake totally up and exhaust totally down. are these the wrong marks to look at or am i missing something. bike does run just a little difficult to start.
    • By gyodock
      2016 KTM 350xc-f - Olins Fork Cartridge Inserts, FMF 4.1 RCT Muffler, Pro Circuit Linkage Arm, Torc1 Reaction Shift and Rear Brake Lever, P3 Carbon Pipe Guard, Acerbis Skid Guard, Mobie Linkage Guard, Acerbis Swing-arm Guards, RYD Crew Aluminum Handguards, Sicass Racing Tail Light Kit with Flush Mount LED Rear Turn Signals, Sicass Racing Handguards with Built-in LED Turn Signals, Rental Sprockets, Trail-Tech Stator Upgrade, ktmandhusky.com Fuel Rail and Anti-vibration Bar Ends, Guts Seat Cover, USB Charging Port, Misc Anodized Orange Aluminum Bling. My wife is getting jealous of the attention I am giving my bike!
    • By Dandeliongardens
      Hey all. I’m a newbie here so let me know if  I’m in the wrong place. 
      I’ll get straight down to it. I’m in the market for a new bike and have been thinking about what’s going to be best for me for a long time. Until recently I finally came to the conclusion that a new YZ250FX is my best option. My last bike was 2015 Yz250f which I loved.
      Now just yesterday I saw a local dealer advertise left over 17’ FX350’s for almost the same price as the YZ. What appeals to me about the Husky is that extra grunt. What doesn’t appeal to me is the suspension and handling and the reliability of the machine. Now I’ve never owned a KTM or Husky so I am basing those two factors on word of mouth only. Like I said, I loved my Yz250f and felt very at home on it, it has probably been the best bike I’ve owned to date. Yamaha reliability is also second to none which adds to my peace of mind on purchasing the YZ. One thing I wish it had was more power though. Obviously it’s only a 250f so you can’t expect it to go like a 450 (not really interested in 450s).
      I ride mostly trails and the occasional day at the mx track. The trails I ride are gravel based, loose, rocky, single trail, and also wide, fast, flowing, sand trails which is where I think my yz250f really shined, and where I had the most fun. I’m only a small rider at 145lbs which is why I’ve steered away from 450s. 
      I’ve read a few forums and others have said the ktm and Husky 350s are unbeatable on the trail which is why I am in this dilemma.
      So basically what I’m trying to decide on is if that extra power is worth compromising for the YZ suspension, handling and usability. Feel free to make any other suggestions, including other bikes as I was also considering the YZ250X 2T.
      Thanks guys
       
    • By Dutch84
      I got about 6 months on my 350 xcf-w. I ride a lot of tight, rocky,rutty, slippery single track in South west PA. The only things I've added are suspension, bark busters, skid plate and disc protectors. I purchased a trail tech mapping switch but hesitant to add it as I heard the dealer needs to unlock the ECU and am not sure how much of a benefit it will be. I have a Scott steering dampner I'm going to add. I'm also looking at exhaust options for my riding conditions. What do you guys think about the items listed and what suggestions do you have?
×