Uncle Buck Posted April 6, 2010 Report Share Posted April 6, 2010 Picked up an 87 Suzuki DT20 outboard a while back having issues with the carb... it's a mikuni carb anyone have any ideas? getting too much fuel and it's flooding the plugs and it won't idle motor has good compression Link to comment Share on other sites More sharing options...
fishhawk7 Posted April 6, 2010 Report Share Posted April 6, 2010 With the Mikuni carb it sounds like you have some varnish build up from fuel that has sat in the bowl, the best thing to do is remove the carb and strip it down and find out if the needle has stuck open in the seat or if the float has stuck or is no longer boyant. soak the carb in carb cleaner, blow it out with compressed air and re-assemble, pay attention to the small ports and make sure they are free of blockages. If it floods only when under power you may have a reed valve issue or check the engines compression. I hope this helps. Link to comment Share on other sites More sharing options...
Uncle Buck Posted April 6, 2010 Author Report Share Posted April 6, 2010 Had a friend of mine look at it (outboard motor hobbyist) and we took the carb apart, and it looked ok... cleaned it up and blew it out and it helped a bit... also played with the float level a bit can't figure out the high speed jet? screw on the bottom is to drain the float bowl... we were assuming the low speed jet is the top screw behind silencer... not sure, but can't find anything online for this carb... compression was 110/100 Link to comment Share on other sites More sharing options...
vance Posted April 6, 2010 Report Share Posted April 6, 2010 A good source for outboard issues is http://forums.iboats.com/ just go to the yamaha/suzuki repair section,lots of info here if you want to post your specific problem you have to sign up but it is free. vance Link to comment Share on other sites More sharing options...
NANUK Posted April 6, 2010 Report Share Posted April 6, 2010 Seems like varnish issue, try a shock treatment with Seafoam. Link to comment Share on other sites More sharing options...
HTHM Posted April 7, 2010 Report Share Posted April 7, 2010 Seems like varnish issue, try a shock treatment with Seafoam. I agree, perhaps pulling the carb and soaking it overnight or a day or two in carb cleaner will help. Link to comment Share on other sites More sharing options...
Sinker Posted April 7, 2010 Report Share Posted April 7, 2010 Like I said on the other site, SEAFOAM it!! I'm tellin ya, the stuff will clean the whole fuel system. Put a full can in a tank of gas and let 'er smoke!! Get it at NAPA dealers!! If that doesn't work, hit it with a hammer S. Link to comment Share on other sites More sharing options...
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