Wont idle

[RKR]

Just finished top end rebuild..everything runs fine except it wont idle.when in neutral ..but before rebuild idle was fine.. i turned idle screw until it would hold idle but then it always wants to slowly idle up faster abd faster until i hav to let clutch out.any suggestions?

 

[Quadrider10]

Sounds like an airleak in the motor. Do a leak down test, and make sure it jetting is correct. Put the aircrew to 1.5 turns out from full in.

 

[Quadrider10]

Do not ride it or run it till leak test is done and there r no leaks

 

[RKR]

So its not a carb issue then?

 

[Quadrider10]

Most likely not. It's most likely an air leak. Leak test it, and come back with it result. Just DO NOT run it. An airleak will destroy it new New top end. If the leak test comebacks and u have no leaks, do a plug. Chop to confirm ye jetting. Why mods do u have?

 

[Blaaster]

Why was it rebuilt?

It is a must, that every rebuild of 2 stroke motor be leak tested.

Then if passing leak test, adjust idle before doing a plug chop.

Idle adjusting.

Start with air screw 1.5 turns out.

Set idle screw so that it has some sort of idle.

Warm up motor and then set idle screw for a fast idle.

Adjust air screw either way to get the fastest idle.

Adjust air screw a little at a time leaving 10 secs to allow the motor to respond.

Re adjust idle screw for desired idle .

 

[RKR]

Ok thankx guys..awesome info on the leak down....but it idles now...jus took some fine adjusting between idle and air screw.

 

[Quadrider10]

Ok thankx guys..awesome info on the leak down....but it idles now...jus took some fine adjusting between idle and air screw.

I would still do the leak test. Better be agate then sorry. And buying a new top end.

 

[Blaaster]

Ok thankx guys..awesome info on the leak down....but it idles now...jus took some fine adjusting between idle and air screw.

It is great that it now idles.

Take a tip from an old fart, it is now time for the compulsary, after rebuild leak down test.

Then plug chop to confirm jetting, you most certainly do not want to do another rebuild.