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Old 07 May 2014, 16:03   #1
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Country: UK - England
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tohatsu 9.8 fixed

My 2 stroke 9.8 had been running a bit rough since I bought it last summer. Not wanting to idle and a bit lumpy. On researching it seemed like the carb was the place to head so I stripped it removing the jets/tubes etc and rubber bits and soaked it for a few hours in MEK then gave it a blow out with carb cleaner. I also took the little fuel pump apart , more out of curiosity as to what it looked like inside , but really glad I did as I found the source of the carb problems. A tiny screw that held a spring plate in had corroded badly and was a regular rust farm . Which im betting had been wreaking havoc in the carb. I cleaned it up temporarily till I source a new one with wire wool and now engine is idling better , but think last owner had obviously messed with the mixture screw and idle screw to compensate for the running problems caused by the blocked carb . So will need to have a look at those. Any one any advice? have adjusted the idle screw so it just idles without stalling but not sure what to do with the mixture screw.
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Old 07 May 2014, 16:24   #2
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IIRC there is no user serviceable mixture screw on the 9.8 (or it is sealed up somewhere)?
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Old 07 May 2014, 16:28   #3
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Its definitely there , clearly visible . I think ! there is one screw which adjusts the throttle start position or least throttle position if that makes sense. Im calling this one the idle screw. Then there is another which doesn't connect to a likage going inside the body of the carb , this I believe to be the lean/rich mixture screw. I believe the 4 strokes don't have an accessible mixture screw
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