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Message started by buckeye sound on 05/21/12 at 18:28:00

Title: Engine ping & deeper backfire
Post by buckeye sound on 05/21/12 at 18:28:00

My first post!

I purchased a 2007 S40 earlier this year with about 350 miles on it. After replacing the bad gas and cleaning the carb, the bike ran very well for the next 100 miles. I got some backfire, but not much. However, I decided to remove the plug to check the burn. And, the plug was bright white - lean.

So, I adjusted the idle mixture out a turn, and replaced the white washer in the carb with one about 2/3 the thickness of the original washer.

The result: the bike has a bit more power at low speeds, but now the backfire is deeper in tone and there is an engine knock or ping that didn't exist before when under a load.

Any thoughts on these new conditions that occurred after I did the washer mod? I have tinkered with the idle mixture taking it out as many as 3 1/2 turns with the same results. Considering the bright white plug, I was also planning to change the main jets.

Thanks -- great site, lots of information!!

Title: Re: Engine ping & deeper backfire
Post by justin_o_guy2 on 05/22/12 at 01:51:08

Pulling away from a stop, when mine was new, it would clatter like heck, I just had to keep the revs higher. Once it had 1,000 miles on it, that stuff was almost finished.

Title: Re: Engine ping & deeper backfire
Post by buckeye sound on 05/22/12 at 15:54:00

thanks, the real puzzler for me is that i would expect that making the mixture richer, the likelihood of knock/ping would be less.