yamaha 30sh 1987

by Chris Kuiper
(Ponoka, Alberta)

My 1987 30SH Yamaha will not throttle up- seems to be starving for fuel. idles great, but starts to miss as i throttle up. lucky to get 10mph now at full throttle. so far i have done the following:


-compression is 120 across all 3 cylinders
-carbs have been torn down and cleaned twice
-timing is set per service manual
-plugs are new and gapped as per manual
-spark tester show spark on all three.
-primer bulb stays hard, does not help to squeeze to get more throttle.

could this be a coil or power pack issue? one of them not working correctly?

thanks for your help.

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