Really really rough idle

[Back_Slash]

hey I have a 2012 jonway gator, I know that doesn't really matter since it's all a Chinese gy6. I got the scooter from someone it didn't idle at all. I've had to put in a new crank, air filter, vairator, clutch, belt, timing chain, a new 72cc bbk, new rocker arms, new carb, new bendix, new starter relay, mirrors, studs and new kick start. After all this, it will still not idle and won't go above 30 mph. I set the valve lash at .003, where I could just hardly pull out the feeler gauge, never adjusted valves on anything else so not sure if that's right or not. Please help! It's been 4 months now and nothing! And I'm all out of money!

[Back_Slash]

It will idle now, just a real rough idle, it will die at 2k rpm, it will go from 3k to 4k then down to 2k and sometimes go up to 5k, it will idle at 5k when first started but once it warms up the idle will drop and go crazy

[Firehawk989]

Sounds like your carb is way out of whack adjustment wise. What size main jet is in there? what is your a/f screw set at? and what is your needle position? Also you should make sure there are no cracks in you intake or vacuum hoses, make sure your vacuum petcock is working properly, carb is getting enough fuel, carb float height is correct, etc.

Also for valve lash, you don't need to crank it down on the feeler gauge too hard. Should still be fairly easy to pull the gauge out once you have the adjuster nut tightened.

[tcthomp66]

The other place I would check is the vacuum hoses and your gaskets/seals. I know this may sound ridiculous to bring up, but sometimes it's easy to overlook the easy stuff.