1980 gs 850 l

[Jerrybigrig]

Having a proformance problem..runs at idle ..get about to an 1/8-1/4 throttle dies out..had the carbs apart several times..cleaned out completely..tried changing out jets several times..even took off this carb set put on a different carb set ..supposedly from an 1100..no better no worse..it does this with factory air box on or off..I have some take off cdi boxes ..changed them out ..no better no worse ..choke partially on..choke off ..doesn't matter..140 psi of compression between all 4 cylinders..was parked in a barn for at least 10 yrs..after doing all this ..I though maybe a mouse nest in exhaust system..pulled 4 into 1 dystem apart at the collecter started it up ..no debris in pipes no debris in muffler..

Any ideas ..??

[KiwiAlfa156]

Have you checked the fuel tap? Could be blocked/faulty. Run it on an auxillary tank and see if the problem goes away.