1981 ATC 250R Issues!

[250twostroker]

Hello, I cannot figure my 250r out. It runs great, but i cannot get it to idle, it has great compression, stock fatty, and stock silencer, new spark flug, no air leaks. I have taken the carb off and cleaned it.

[4cfed]

take the intake off the carb on the air box side and look to see if the slide is coming all the way down, work the throttle to make sure its not binding and keeping the slide hung open

[250twostroker]

its nice and smooth, it doenst idle high or stick, just no matter how much i turn in the idle screw its just not enough.

[4cfed]

so it wont idle as in wants to die????

[250twostroker]

yep, i have to keep it runnin myself or itll just die, otherwise it runs great, rides weelies real nice

[4cfed]

could be worn out reeds, or to rich on the pilot, you try adjusting the throttle cable?

[250twostroker]

reeds sit flat, and it does smoke alot when i try to keep it idiling, but when i run it, it dont smoke much

[4cfed]

if it smokes more than what you think it should than it could be way way rich on the pilot,.... let me look and see if i have a 'cold' vid of my 81 250r



edit... only vids i have of are slow speed riding to wide open throttle

[250twostroker]

Well i also have a little kx60 pit bike, and it doesnt smoke near as much as this at idle...

[cr480r]

try turning the air screw out... if it doesnt help a pilot change may be required.. a bike will never idle if the pilot circuit is adjusted/jetted incorrectly

[250twostroker]

ok, ill mess around with it tmrw and see what i come up with. I also have another question. I am needing 9" wheels for the back and a 10" narrow for the front, any suggestions?

[4cfed]

ok, ill mess around with it tmrw and see what i come up with. I also have another question. I am needing 9" wheels for the back and a 10" narrow for the front, any suggestions?

i beleve... 200x conversion on the front... well that will get you a 11 front.. and rears... 200x hubs/ 250x 300ex 400ex hubs and wheels... i think

[250twostroker]

did any have 10 in front? I have two 9" tires off a 300ex and two 10" fronts, i want a skinny up front.

[4cfed]

search for the 200x conversion.. i know a member on here was sellin his 1st gen r with the conversion.. he could help you more on it

[MonroeMike]

Read this thread, it may help.

http://www.3wheelerworldforums.com/showthread.php?t=55086

[250twostroker]

well, got it to idle by changing the jets, but now i cant ride it! :cry: I was ridin up and down my driveway poppin wheelies, nothin crazy, and i came up towrds the barn just crusin and it bogged out.. So I went to kick it over and no compression! :wondering: So i pushed it into the barn, pulled the head, the top of piston and cylinder looked good from never being rerbuilt, felt the inside of the cylinder and its groved :mad: so then i took the cylinder off and I guess with never bein apart the circlips got weak, it had dropped a circlip and scarred everything up, time for a rebuild, i am hopeing i can get away with the first O.S of 70.50mm but might have to go to 71mm

[CanadianRednex]

Good luck boring it 71mm! thats like 1/4 of a foot

[250twostroker]

umm, stock is a 70mm bore i didnt know 1mm (71mm bore) oversize is 3 inches???

[CanadianRednex]

haha, i know man! I was playing with ya