Charley Posted May 25, 2009 Share Posted May 25, 2009 I have a 75 HP. Yamaha (1997) 2 stock. Has a rough idle it will kill at closed thoutle. It runs rough intil 4500 RPM Runs fine from their on up. Put new plugs in. Any ideas? Quote Link to comment Share on other sites More sharing options...
overdalimit Posted May 26, 2009 Share Posted May 26, 2009 Check the timing, clean the carbs, check the compression, make sure the gas is fresh, run the old stand by seafoam through it and let us know if it made any difference at all. You want to do the easy stuff before you dig deeper. Quote Link to comment Share on other sites More sharing options...
Charley Posted May 26, 2009 Author Share Posted May 26, 2009 Gas, I been fishing a nummber of times put 15 gal. of gas in thurs. I run seaform a number a times in a season. Its ran great all year so far. Was on Leech all the day before. Again ran great. Quote Link to comment Share on other sites More sharing options...
marine_man Posted May 26, 2009 Share Posted May 26, 2009 Sounds like you need to clean your carbs out... sounds like the low speed jet is partially clogged / plugged.marine_man Quote Link to comment Share on other sites More sharing options...
Charley Posted May 26, 2009 Author Share Posted May 26, 2009 What would clog a jet on a carb? Quote Link to comment Share on other sites More sharing options...
jeffreyd Posted May 27, 2009 Share Posted May 27, 2009 dirt in fuel, varnish from old fuel, piece of hose that came off several things. Quote Link to comment Share on other sites More sharing options...
marine_man Posted May 27, 2009 Share Posted May 27, 2009 Absolutely.... most notable varnish from old fuel.marine_man Quote Link to comment Share on other sites More sharing options...
Charley Posted May 27, 2009 Author Share Posted May 27, 2009 Even if you store it with seafoam in in it? Quote Link to comment Share on other sites More sharing options...
marine_man Posted May 27, 2009 Share Posted May 27, 2009 It's possible...It kind of depends on if there was some buildup prior to storing it with seafoam, or if there's gunk in the carbs (which seafoam wouldn't do too much for).marine_man Quote Link to comment Share on other sites More sharing options...
BoxMN Posted May 27, 2009 Share Posted May 27, 2009 That is what was wrong with my 25hp, after I bought new fuel line, new gas tank, rebuilt fuel pump... all it needed was a shot of air through the jet... doh! Easy fix, I would measure how far the jet is from "all the way tight" - I put tape on screwdriver and then count the turns, its a bit easier to keep track for me Then take an air compressor and give it a shot or two of air. Worked perfect for me. Good luck. Quote Link to comment Share on other sites More sharing options...
Charley Posted May 27, 2009 Author Share Posted May 27, 2009 Well took it too Hannays the diaphragm was bad. One thing they told me was the corn whiskey gas they are selling is not good for outbroads. Quote Link to comment Share on other sites More sharing options...
jeffreyd Posted May 28, 2009 Share Posted May 28, 2009 heck it is not good for anything boxmn. not even drinkin Quote Link to comment Share on other sites More sharing options...
marine_man Posted May 28, 2009 Share Posted May 28, 2009 The diaphragm in the fuel pump?Glad to hear you got it squared away.marine_man Quote Link to comment Share on other sites More sharing options...
Charley Posted May 28, 2009 Author Share Posted May 28, 2009 Marineman- In the carb. Quote Link to comment Share on other sites More sharing options...
BoxMN Posted May 29, 2009 Share Posted May 29, 2009 Is there a diaphragm in the carb?... I don't recall seeing one in the ones I did, but there could be a combo carb/fuel pump I guess.I do recall needing a new daiphragm in my Dad's motor when I was young, but I can't recall any more than that. Glad its working again for you! Quote Link to comment Share on other sites More sharing options...
marine_man Posted May 29, 2009 Share Posted May 29, 2009 No, I don't believe there's a diaphragm in the carb.marine_man Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now ↓↓↓ or ask your question and then register. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.