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Buell Forum » Old School Buell » M2 Cyclone » Archive through July 18, 2012 » 2000 M2 Reduced Torque at 4500 rpm « Previous Next »

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Buellathebuzzer
Posted on Sunday, April 15, 2012 - 09:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So, I've been taking an 2000 M2 back to stock parts and recently replaced the carb & breadbox and put the stock exhaust system back on.

What I notice now is that I loose torque at around 4500 rpm. I have no dyno, but it's pretty remarkable drop.

Is this typical? Or is there something wrong in the setup.
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Dave_02_1200
Posted on Sunday, April 15, 2012 - 12:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The stock muffler allows my M2 to pull strongly well past 5000 RPM.

My Buell Race Muffler was only better at high RPM and I seldom rev it high enough to benefit from it.

Check the jetting, mixture screw setting, and shim the needle if necessary to get a good mixture.

They were way too lean from the factory and getting the mixture right throughout the range makes a huge difference.
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Jayvee
Posted on Tuesday, April 17, 2012 - 11:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Are the cams stock?
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Littlebuggles
Posted on Tuesday, April 17, 2012 - 01:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Air/fuel mix screw @ 2.5 turns out.

Double check you main jet size on that carb, you say put stock carb in, does that imply stock jetting?

The stock setup has a noticeable drop in power from 3-35/3800 rpms, so I kinda wonder if Jayvee is onto something there.

Double check your static timing?
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Buellistic
Posted on Tuesday, April 17, 2012 - 06:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Littlebuggles:

Way to go on saying to check the IGNITION TIMING which is the first thing to check !!!
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Buellathebuzzer
Posted on Tuesday, April 17, 2012 - 09:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

it's a brand new 28017-00Y so the jet is the stock jet.
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