Re: 9.9 Johnson Carb Question

[joesnuffy]

I have noticed that magneto timing on these motors is also very important to get them to idle correctly. When the carb roller cam follower is lined up with the timing index mark (not really sure what mark on timing plate is called that roller rides on to open carb) the carb butterly should be shut and be on the verge of opening once you advance the timing a tad more. The carb butterly has to be shut when lined up with that timing index mark to make the carb use the low speed circuit correctly at idle speed on those particular motors. I have almost pulled my hair out getting mine to idle correctly that was a crucial part of it.

The bearing needle valve and the needle valve retainer must also be in good condition for a good idle. As someone mentioned carb cleaner destroys them. I destroyed a brand new needle valve retainer in seconds with carb cleaner.

Good grounds on all ignition components are also critical as you mentioned. All 3 of mine were salt water motors and the grounds especially for the ignition coils had to be cleaned up with sand paper and a file. If in doubt thoroughly clean all the grounds then you can rule that out. The component might be bad but not the ground.

Just my 2 cents and I hope that helps,

Joe

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