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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through April 15, 2009 » M2 Backfire « Previous Next »

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Klloyd
Posted on Saturday, January 03, 2009 - 09:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I have a 99 m2 and i just changed the gaskets on the rear cylinder(jug up) due to an oil leak. The bike ran fine for about 3 minutes and now it backfires if i rev it past 3500-4000 rpms. I cant test drive it cause my chain isnt here yet. Just looking for some ideas on what it might be.
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Road_thing
Posted on Saturday, January 03, 2009 - 09:33 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Intake seal.

rt
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Klloyd
Posted on Saturday, January 03, 2009 - 09:46 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
thats what i was thinking, im gunna check that out tomorrow. Im also going to chage the header gaskets again theres a slight leak in the rear.
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Klloyd
Posted on Monday, January 05, 2009 - 12:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Wasn't it. Doesnt do it as bad but it still backfires, im gunna change out the plugs and see if that helps at all... Any other ideas??
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Tim
Posted on Monday, January 05, 2009 - 09:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Is this a backfire thru the carb, or popping of the exhaust on decel?

If exhaust is popping, your on the right track with exhaust gaskets. Did you use RTV silicone when you installed the V&H on your header?

If it coming out the carb, did you at anytime move the timing plate? Did you re-connect the Voes vacuum line?
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Klloyd
Posted on Tuesday, January 06, 2009 - 07:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Its popping out of the exhaust, the V&H was on there with no issues before. Gotta wait until tomorrow for the exhaust gaskets cause my local dealer was closed for a week. I double checked all my connections, hoses, wires, screws, bolts... everything. Im gunna do the plugs too, just do it all at the same time to eliminate any possibilities!! Thanks again for all the help.
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Bombardier
Posted on Tuesday, January 06, 2009 - 10:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Sounds like reversion.

Air coming back up the exhaust and igniting unburnt fuel.

I would go with Tim on the RTV sealant for the connections first.
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Klloyd
Posted on Wednesday, January 07, 2009 - 09:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Well i changed the rear exhaust gasket that was leaking and also changed out the plugs.... fixed it!! Thanks for all of the inputs.. now only if my chain conversion kit would get here so i can go ride. Been 8 days still no word if its sent out or not, thanks a lot Orlando Harley, you rock!
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