Posts
9
Joined
3/24/2021
Location
Pelham, NH
US
ReedHockey26
3/24/2021 4:02pm
3/24/2021 4:02pm
Edited Date/Time
3/26/2021 6:59pm
Hey i'm new here. I've had a 2008 crf250r since about April 2020, and the entire time it was weird starting hot. Finally got into the motor and found the exhaust valves were tight, and reshimmed them. Now it wont idle unless the choke is on or the idle is set uncomfortably high. Ive tried changing the jets, there is a 45 pilot, 178 main i believe, and 68 leak. Both exhaust were shimmed to 0.011, and the intakes were set to 0.004 and 0.005, which i'm pretty sure is within spec. I really don't want to have to do a valve job cause those are expensive i'm and unemployed teenager. I try to do all my own work as well instead of bringing it someplace.
It’s really easy to flip the floating plate on the slide, and it looks correct when it’s upside down. If you do this, it won’t idle and will run really weird. I only discovered this after tearing my 07 450 carb apart three or four times trying to figure out what the heck I did, lol.
Paw Paw
FCR Carburetor slide and Vacuum Release Plate (square end MUST be oriented down)
The Shop
Another thing that is a common prob on these bikes, the hot start plunger gets corroded and gunked up with dirt and old grease. The cable needs to be free with some play and the plunger needs to be smooth and greased and close completely when the hot-start lever is released. If it is sticky or hangs up it leaks extra air and the bike will not idle correctly.
Post a reply to: 2008 Crf250r Wont idle