PinchiPancho
Cadet
- Joined
- Jul 26, 2004
- Messages
- 6
I have a 89 merc 100hp outboard (Serial # C139951)that runs good in forward and reverse. It runs very rough and backfires only when in idle. I have had the compression checked and it was 110 on the top two plugs and 105 on the lower two. <br /><br />I was told that it might caused by dirty carbs but I am not sure. Any suggestions on how I can get it to idle smoothly? <br /><br />Can this poor idle be cause by a bad fuel pump? It will not run properly with the original fuel filter and I've had to replace it with a much smaller filter to make it run better. <br /><br />Any suggestions would be greatly appreciated.<br /><br />Please post or email me your suggestion. <br /><br />thanks,<br />edwin<br />erivas3@lausd.k12.ca.us