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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through September 10, 2008 » Back fire'n « Previous Next »

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Chichiman
Posted on Thursday, August 21, 2008 - 10:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
just replaced stock air filter on my m2 with k&N,backfires like nuts now.whats up?shouldnt need to rejet for that?had my muffler of recently too,it was a bitch to get back on too so i'm pretty sure its tight with no leaks?
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Reepicheep
Posted on Thursday, August 21, 2008 - 10:57 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Seems like going from a higher restriction filter to a lower restriction filter would benefit from a re-jet. Or at least changing the air fuel mixture.

On my 2000 M2, The main was fine (something huge, forget what) but the low speed jet needed bumped up, and the fuel air mixture screw needed to come out. There is boilerplate in the knowledge vault (200 main jet, 45 low speed jet, 2.5 turns out on the fuel air mixture screw? Better check it, thats a 5 year old memory...)

What year is your M2? Does it have the new "upside down Y" cast exhaust mount? If not, you want it...

(Message edited by reepicheep on August 21, 2008)
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Chichiman
Posted on Thursday, August 21, 2008 - 02:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
my bikes 2002 with the y mount,what is boilerplate? love this bike but it's turning into the domino affect.
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Reepicheep
Posted on Thursday, August 21, 2008 - 03:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Hey! Good for me! I kept it in my profile, where I logged everything I did to the M2... here is what I recored (4300 is the milage I did it at)...

quote:

4300 Replaced slow jet with a 45 (fast jet was already a 200) and turned air mix screw out 2.5 turns. Huge improvement in runnability and seems to run cooler... I view this as a reliability upgrade, not a performance upgrade.

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Chichiman
Posted on Friday, August 22, 2008 - 08:34 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
thanx.anybody got a part number for that jet?
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Packrat
Posted on Friday, August 22, 2008 - 05:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
All you need to know is jet size you need, and what brand carb (and model)...ie; #22.5 pilot jet for Mikuni TM32...Bad news (at least in my area) is that shops don't stock any carb jets..maybe someone here has one they could mail ya!!
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