more jetting discussion!

Read where patton said stepping up on pilot jets would help with backfire on decel. I've stepped up from 37.5 to 42.5 and bike really likes the extra fuel but it does pop on decel. Checked my plugs and they are darker than they should be, not totally black, and my pipe is sutted (sp?). I feel like I'm already a little rich and should go to the 40's. Any ideas?

You can also get decel pops from a vacuum leak or anything that causes a lean condition. If you have pods or reduced baffle exhaust it can make it lean. Another thing is to make sure the fuel levels in the bowl are correct (clear tube) a low one will make it pop from running lean.

You could try going up anotjher size on the pilots too, but make sure everything else is in order first.

This part:

and bike really likes the extra fuel

makes me wonder if it's still too lean. On my twin, when you go too rich on the pilots it starts to "surge" and run off. If you are still getting improved performance, you may not be there yet.

Make sure the emissions ports are not leaking air. That will cause backfiring on decel. So will any exhaust leak near the head.

Bountyhunter- wouldn't my plugs show lean if it was? Also, my dad was behind me last weekend and said he saw a little smoke when I was getting on it hard. I've only put about 500 miles on a re-ring so could that be my smoke? And loudhvx- with my exhaust I made I could have a little leak! :whistle:

Two sizes up on the pilot jets is quite a bit, I would go with the #40. Yes you will still be smoking at 500 miles. Mine usually stop using oil at about 1000 miles after engine re-build.