bigbassbrent
Cadet
- Joined
- Apr 10, 2005
- Messages
- 18
Hi ALL<br /><br />I have 15 hp johnson that starts, runs great/fine at low speed, but as soon as I try to go fast the engine revs up and immediately revs back down again, and unless I turn the gas lever back to slow speed, the engine will turn off. I checked to make sure I don't have a tank, gas line, connector problem but that isn't the case (same issue no matter whose tank I use). I checked to make sure the fuel filter wasn't plugged up, but it is clean. I checked for fuel leaks but can't see/smell any. <br /><br />Is this a carb problem??? I don't know much about carbs but maybe some else does???? Can you help??? It is a 1980's Johnson. THanks in advance!!! Brent
<br /><br />Sounds like there's a restriction in your main jet. That's on the bottom of the carb and dirt or varnish can partially block it and not allow enough gas to pass. They're very simple carbs. If you've ever had one apart from a lawnmower, you wouldn't run into any suprises. A manual might help. You can find them at many public libraries.