bigshrimpin
Seaman
- Joined
- Jan 22, 2003
- Messages
- 69
I am having trouble with my 88 yamaha 200hp knocking at low RPM's. The knocking seems to begin when I put the engine in gear up to 2200rpm, after running the engine for 15 - 30 seconds in the 1400 to 2200 RPM range the knocking goes away or if I accelerate past 2200rpms the knocking will also go away and won't return until I restart the engine. Whenever I turn the engine off and then start it back up the knocking is back (right in that RPM range). The knocking usually doesn't last more that 15 seconds after the engine has been running. <br /><br />Other history:<br />I recently rebuilt the carbs and replaced the fuel pumps, fuel filter, and lines.<br /><br />Any ideas? <br />I am going to try running higher octane fuel.<br />I am also wondering if it could be a clogged low speed jet one of the carbs? I honestly don't recall if the engine knocked like this before I rebuilt the carbs. I only ran the engine a few times before I did the carbs.