SuzukiSavage.com - installed the 55 pilot yesterday

azjay Serious Thumper Offline aridzona... its a dry heat Posts: 816 Gender:	installed the 55 pilot yesterday 05/10/06 at 07:11:24 i did not get the results i was hoping for. the idle adjust is now set for less than 1 turn out, and the backfire does not seem to have resolved itself. i guess i'll return to the 52.5, and look for exhaust leak/air leak. any suggetions? similar experiences?
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Savage_Rob Serious Thumper Alliance Member Offline Mechanically Inclined Amateur Posts: 6972 Texas (Dallas area) Gender:	Re: installed the 55 pilot yesterday Reply #1 - 05/10/06 at 07:47:48 Backfire drove me nuts adjusting/readjusting the carb until I replaced the gasket between the cylinder head and the header.
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SeattleSavage

Ex Member

Re: installed the 55 pilot yesterday
Reply #2 - 05/10/06 at 16:53:22

Are any of the holes in your swiss cheese airbox cover on the carburator side of the cover? This will cause many undesirable effects. Make sure your filter is seated properly. If you have the sportster muff 152.5 and 55 pilot, you should probably at least go with the K&N stock replacement. Check the vacuum hose from petthingy for cracks/leaks. Check the clamps on the carb head and carb to airbox, you don't want those leaking either.

Kevin

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azjay

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aridzona...
its a
dry heat

Posts: 816

Gender: male

Re: installed the 55 pilot yesterday
Reply #3 - 05/11/06 at 06:14:22

rob, i replaced the header gasket when i un-muffled the exhaust. they're cheap, i might do it again just to eliminate it.
seattle, the holes are all on the filtered side, clamps are tight, i'll check for vacuum leaks. i'm not convinced that an air filter wiil cause a low rpm/mid range problem, but i'll keep it mind.
thanks both

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dyna muff,1/2 spacer,152.5,55,drilled air box,idle mix,spark plug door,harley bars & seat,spitfire windshield,turn signal,dunlops,man.pethingy,ISO pegs,engine cage,hiway pegs,support 81

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klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: installed the 55 pilot yesterday Reply #4 - 05/11/06 at 09:23:38 I agree an air filter would be a top end thing. Clive W
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Steve530

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2005 No Login

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Posts: 452
Knoxville, TN
Gender: male

Re: installed the 55 pilot yesterday
Reply #5 - 05/13/06 at 22:04:57

Have you tried re-torqueing the exhaust bolts? When I installed the Dyna muffler, I bought a new header gasket. I torqued it carefully. I rode it a couple of days. Finally I got back around to checking the header bolts and found they loose enough to remove without a wrench.

So I torqued them again. I asked about it here, and someone told me that you need to re-torque them. It actually took about 4 times until the bolts remained tight. Apparently the gasket has to crush and the torque spec is not high enough to do that in one pass.

This solved my header bluing problem. It's sort of golden now. Backfiring is all gone, except for one last gasp on shutdown.

Does anyone undertand why an exhaust leak causes a backfire?

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'97 Black / 1/2 white spacer
155 main jet / 55 pilot jet / Dyna muffler
snorkel removed / K&N drop in / seat raised
Slipstreamer SS30 windshield

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Brewbrother

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Re: installed the 55 pilot yesterday
Reply #6 - 05/14/06 at 19:34:06

Steve530 wrote on 12/31/69 at 16:00:05:

Have you tried re-torqueing the exhaust bolts? When I installed the Dyna muffler, I bought a new header gasket. I torqued it carefully. I rode it a couple of days. Finally I got back around to checking the header bolts and found they loose enough to remove without a wrench.

So I torqued them again. I asked about it here, and someone told me that you need to re-torque them. It actually took about 4 times until the bolts remained tight. Apparently the gasket has to crush and the torque spec is not high enough to do that in one pass.

This solved my header bluing problem. It's sort of golden now. Backfiring is all gone, except for one last gasp on shutdown.

Does anyone undertand why an exhaust leak causes a backfire?

Think about why that condition would be bad for an air pump and you have your anwser.

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Opportunities multiply as they are seized.
No spacer,60 pilot jet, 155 main jet, plug door, sportster muffler, k&n drop in, iridium plug, brake pedal mod,de-badged, Dunlops, bullet turn signals.

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