PumpkinHumper Posted September 28, 2005 For the last few weeks when I start the kids bike it has started realy hard. Starts and stalls. Have to do this like 15x to keep it running. Once I get it to stay running by working the throttle and holding it at a higher idle it coughs thru the carb once in a while. Once it warms up this all goes away and it runs / idles good. Just starting cold it does this. I cleaned the air filter. Cleaned the carb and jets real good with carb cleaner and air. Checked the valve clearances. Whats the deal? Maybe a valve going bad causing the missfiring. This is an 03 and has the poop rode out of it including a season of MX this year. It may be time for a rebuild. Big bore kit, hot cam, carb, redo valves....Hmmmm Share this post Link to post Share on other sites
yzfthumper61 Posted September 28, 2005 that or you can buy my 2005 ttr 90 off of me for like 900 bucks but all it needs is a new swing arm bolt whih i ordered it like a week ago and or i have an 2005 yzf250 for salf its real fast set up for a pro and has fmf exaust on it ill let it go for 5000 and thats cheap conncidering the 800 dollar exaust and oll the motor work on it Share this post Link to post Share on other sites
PumpkinHumper Posted September 28, 2005 Ahhh no. I think not. This is the last year for the 90. Hes moving up next year. Share this post Link to post Share on other sites
titoheadfaceman Posted September 29, 2005 check the timing of the cam chain. sounds like it could be off maybe Share this post Link to post Share on other sites
mitchwilliams Posted October 1, 2005 Does kind of sound like a timing issue. That would be quick to check and easy to fix! Good luck. Share this post Link to post Share on other sites
