Tomos A3 Upgraded, Now Running Poorly

I have a 1991 Tomos Bullet with an A3. I switched the stock dellorto with a 15.15 SHA and added a Techno Bullet pipe. The Stock carb had a 56 main and the new 15.15 has a 68. When I crank her up, she will rev up and idle really high. Which scares me! Idle screw is turned out and throttle cable is not pinched or stuck. It performs poorly aswell and pulls itself on idle. Is the 68 jet causing this high idle and giving it too much gas? What would be a proper jet to try?

Re: Tomos A3 Upgraded, Now Running Poorly

air leak somewhere. run you bike then spray carb cleaner around any places that air could escape. ie. carb/intake or intake/cylinder or cylinder/head or cylinder/case or airfilter/carb. if there are bubbles or your engine dies then there is an air leak.

Re: Tomos A3 Upgraded, Now Running Poorly

It never idled high like this before? I mean would a big jet cause a high idle?

Re: Tomos A3 Upgraded, Now Running Poorly

no but putting on a 15.15 SHA incorrectly might have made an air leak which will make it idle. make sure you have a gasket and the carb is on there tight (don't strip any screws)

Re: Tomos A3 Upgraded, Now Running Poorly

Carb and intake are tight and manifold gasket is intact.

Re: Tomos A3 Upgraded, Now Running Poorly

Tight doesn't mean anything... Does the 15mm have the plastic shim in there? Plus you will probably need to rejet. Did you check to make sure that the throttle slide isn't stuck?

Re: Tomos A3 Upgraded, Now Running Poorly

I sprayed carb cleaner around the carb where it connects to the mani and motor died down. So I must have a leak there...But why everything is tight?

Re: Tomos A3 Upgraded, Now Running Poorly

It's got the shim, but I did port the manifold inlet with a dremmel. I mean I didn't go overboard but the wall is thinner..

Re: Tomos A3 Upgraded, Now Running Poorly

Some carbs are prone to air leaks or the cylinder may just have a leak in the cylinder.

Put RTV silicone to seal the seam on the clamp of the carb.

See photo

1229562472_dellorto17.jpg

Re: Tomos A3 Upgraded, Now Running Poorly

I put RTV on EVERYTHING. I pour that shit all over. Ugly as all hell, but no air leaks!

Re: Tomos A3 Upgraded, Now Running Poorly

I fixed that air leak at the carb with a thicker o-ring and smashing the carb against the intake then tightening it very tight as I pressed it on. I hate SHAs.

Re: Tomos A3 Upgraded, Now Running Poorly

phpg or oko= sweet

SHA=sucks ass

Re: Tomos A3 Upgraded, Now Running Poorly

Well I just bought the SHA so that makes me feel very warm inside...I am going to make it work. I put the stock carb on and lined the shim with some RTV and will try it out in the morning. With the stock cylinder and manifold, I couldn't do a PHPG could I? I'm not into fabricating either...

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