ChillyWaa

Hi - I recently rejetted with #48 pilot jets. The bike runs incredibly well now and has for several hundred miles. However, when coming off hard acceleration it backfires and pops quite loudly. I understand this is the result of a lean mixture.

Am I doing any long term damage? Damaging valves, etc? I love my new performance but I don't want to hurt my hawk.

Does anyone have any insight?

Thanks,
Steve

Jack Flash

Here's a nice thread to read

https://www.superhawkforum.com/forum...ackfire-11214/

sailorjerry

That is a great forum to read through, also just a side note. Check all of your exhaust gaskets.

My bike just recently started popping real bad on decel and I couldnt figure out what the cause was, turned out the exhaust gasket from the rear header to mid pipe had just enough of a leak to let fresh air into the pipe and cause it to pop on decel. I didnt find it till one day I got on her really hard and then lost all power and slowed down and could hear the exhaust leak.

Now that I have replaced the gasket, no more popping.

CrankenFine

Personally I love the occasional popping on decel. I think it's a cool sound that makes my bike noticeably different!

rageohio

I love that sound to it scares women and children

2wheelsagain

If you've gone up in jetting its most likely an exhaust leak.
Usually from the graphite gaskets or even a pin hole in the header pipes.
Whatever it is its letting in oxygen into the hot exhaust mix. If the leak is after the valves it's not doing any damage.
If you've had the PAIRS (or whatever honda calls theirs) system blocked off that could be leaking.

ChillyWaa

I agree, I like the noise.

But since I was tinkering with the carbs, it sounds like I screwed up the PAIR install.

Even though I went up to #48s - is it possible to run lean now by incorrectly correcting a vacuum line or something?

I'll check the front plug tonight and confirm. Thanks for all of your help even if there is some debate in past threads I read.