Quote Originally Posted by xboxrox View Post
Hello frogzmax ~ welcome to this place

ROUGH IDLE (assuming good ignition good spark plugs good compression good fuel)

1) valve lash not correct ~ are the lifters noisy ~ Rislone engline flush & oil change & hy-per lube ZINC
2) carburetor air/fuel idle mixture adjust ~ shoot for highest reading on a vacuum gauge
3) visually check air cleaner thermo valve being open with warm engine & air filters not clogged
4) visually check choke plate is open with warm engine
5) check warm engine idle RPM with a tach
6) check warm engine initial timing with timing light
7) check for vacuum leaks with hand vacuum pump ~ especially test the distributor vacuum actuator & secondary throttle actuator
8) check the carburetor to intake flange connection for leaks ~ use teflon plumbers tape sparingly on threads of loose bolts
9) clean & remove any electrical silicone grease from the TPS & carburetor control wiring harness connections
10) it's possible the carburetor needs work ~ rubber diaphragms wear out over time regardless of mileage on the vehicle
11) DIY carburetor rebuild or buy a rebuilt carb from a vendor close by your location <~ keep going back for replacement warranty carbs
12) check out my member page with Mikuni carburetor photo albums (more photos coming soon)

Thanks for joining here frogzmax

Hey thanks for the response
thats a huge list to check much appreciated

1) valves arent noisey engine drives very quiet
2)adjusted this a little seemed to help a bit but without vacuum gage
3)have not checked thermo valve air cleaner replaced
4)have not checked
5)not checked
6)timing was a bit retarded i have it now between 10-7 ran better than before
havent checked the rest yet but will, also going to check out your page
thank you!

the old fuel filter was filled with dirt so I think I may need to clean out the gas tank and lines. I am hoping the rough running is partially due to bad ignition timing. is there anyway to check the ignition coil is working properly?