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Discussion Starter · #1 ·
My bike was running great but a slight backfire when letting off the throttle every 100+ miles....But after it sat for a week due to a broke clutch cable it ran bad....Almost like 2-3 cylinders only....My guess the air filter glazed over....

So I bought new ngk plugs and cleaned my filthy wet k&n which prior I thought was clean...But it was really a wet sandy grit....High pressure air and 10 minutes later....Wow....Very Nice...

Has 10-20 percent more power now and lifts even easier then ever before....But still a slight low backfire after letting off the throttle...Even at 20mph...

So I adjusted my power commander 2 according to utube...I noticed it was at full fuel prior and all levels.......I take all three down to middle levels..Turn the bike off and double check the settings and they are still programmed..But still backfires.....

Then I take the K&N out with the cover and drive down the street and it doesnt bog at all...Runs the same.....

Big maybe root cause.....Since cleaning the clogged filter and changing plugs.....I can hear a new or louder reed valve area or modded/cut air box...Similar to either a now complete flowing air system or disconnected emissions tube.....

Dunno...

Sorry for the long and confusing post but all the details are here and nothing left out.....The bike does run super super nice now....
 

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thats wierd,

im having the same issue bike ran great then installed ngk plugs and a K&N air filter and now the bike back fires real bad shoots fireballs out the exhaust. mine kinda bogs and is a little non responsive too but i think thats because i havent gotten a power commander yet. anyways im intrested to hear what goes on so i can fix my back fire problem also
 

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Wow, I run NGK plugs, a K&N, modded stock exhaust, and a PCIII......No probs whatsoever running the Hindle slip-on map
 

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Discussion Starter · #5 ·
I think Ive been told my answer tonight...

LOL....One of those guys you work with and you tell gear head problems to when bored and just for chat....And whatever he says usually just doesnt fit.......

But tonight he asked what fuel my bike needs....And then I know he is right with out any more words.......I say Im running 93 and he says go 89.....

I believe he is right....Too high of an octane so its sparking off in my pipe...

But being able to run withought a filter or air box lid....My previous owners map for my pc2 must take care of that............
 

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I think Ive been told my answer tonight...

LOL....One of those guys you work with and you tell gear head problems to when bored and just for chat....And whatever he says usually just doesnt fit.......

But tonight he asked what fuel my bike needs....And then I know he is right with out any more words.......I say Im running 93 and he says go 89.....

I believe he is right....Too high of an octane so its sparking off in my pipe...

But being able to run withought a filter or air box lid....My previous owners map for my pc2 must take care of that............
Unless I am understanding you wrong, you are telling me to use a lower octane to get rid of a spark knock? Its really supposed to go the other way 'round.
 
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