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one spark plug lean...one rich

4681 Views 8 Replies 4 Participants Last post by  4everrunning
I just installed an Area P full exhaust on my 08 250R as well as a Dynojet kit. I was hoping the recommended settings would work but...of course not. It is running poorly below 4500 RPMs. I have now moved the needle lower and it seems to be running fine now.

However, that is not what this post is about. After removing the spark plugs, that were used with factory settings, one side appears to be running lean while the other running rich. I have not tried to sync the carbs as none of that has been touched. I do know that the factory settings for the fuel/air screw is different for each side. Could that be the reason one side shows rich and the other lean? Should I have the carbs re-synced?

Any advice would be appreciated.

1 - 1 of 9 Posts
Have you checked the gap for both plugs and make sure they're within specs?
1 - 1 of 9 Posts
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