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M2marc
Posted on Saturday, November 05, 2011 - 02:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have a 2000 M2 with an aftermarket K&N. OEM muffler. I am at least going to up the pilot/slow jet to the 46. my question is can i increase the main to a 200, can I drill out the slide, and can I shim the needle without adding an aftermarket pipe ?
I have done the reading and research but cant find an exact answer.
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Jim2
Posted on Sunday, November 06, 2011 - 01:17 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I hear some people say their 2000 M2 had a 180 main (or was it 190?) and others say theirs have a 200 main as stock from factory. Mine had a 200 main.

I put 45 slow with the 200 main I already had from stock. I still run stock pipe and stock air filter. I road tested before and after I drilled slide and shimmed needle. Much better after the mods.

I think I'm a tad rich during the hot summer days. When it cools down to 67F it's perfect.

I'm at an area that is +/- 25 ft of sea level.
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M2marc
Posted on Sunday, November 06, 2011 - 09:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Last night I could'nt wait for an answer so I just re-jetted and thought that I would start from there. Mine had a stock 195 main so I bumped it up to a 200,bumped up the slow to a 45, drilled the slide, shimmed the needle.

The problem is.... now faint black smoke from the muffler, idle adjust does not raise idle. I pulled the air filter off and let it run and some gas/gas mist was coming out of the carb inlet.

I'm thinking maybe either the main is too big and I should go back to the 195. Or I should remove the shim. is there something else that I might be missing ?

I live in Florida if that info helps at all.

Any advice would be appreciated.
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Ratbuell
Posted on Sunday, November 06, 2011 - 09:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"Idle adjust does not raise the idle" - please clarify. The adjustment screw/cable (early bikes had a screw on the carb, later ones added a remote cable adjuster) is separate from the jetting and is simply a throttle plate stop adjustment. Sounds like you have separate issues here.

Why were you jetting up in the first place?
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Bluzm2
Posted on Sunday, November 06, 2011 - 09:46 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

45 pilot, 190 main is a good place to start.
1 1/2 turns out on the air screw. You did uncap the air screw right?
Shim the needle about .050".
That's about as good as it gets with a stock pipe and intake.
I think a 200 is a bit bit for a stock motor.
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M2marc
Posted on Sunday, November 06, 2011 - 09:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The idle adjust is a remote cable i'll take a closer look and see if its the plate.

I'm just trying to get the best performance out of the bike without going overboard.

Bluzm2
Stock was a 195. The air/fuel mixture screw is out 2 1/2.
maybe i'll try the 195 again instead of the 200.
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Jim2
Posted on Sunday, November 06, 2011 - 11:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Will you notice a main jet size change at idle? Someone chime in.

I started my idle adjust at 2 1/2 turns out but drove that in about 3/4 turn (can't remember how much for sure). I do have a little faint black smoke but only right at start-up, not after.

I also think that my shim came out to about .040, I tried a couple of different washer combinations and that seemed the best for my bike (using only my finely honed butt dyno and keen senses).

I also re-freshed all of the my airbox seals so I know I'm not getting excess air that is not passing through the filter.
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M2marc
Posted on Sunday, November 06, 2011 - 11:26 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Now that you mention it I don't believe the main has anything to do with idle.

I'm using the stock needle which is a one piece needle. I used a shim that I had leftover from another jetted bike. I'm not sure of the size but don't think it should have that much affect.....or will it?

I have an aftermarket A/F mix screw and is tight to screw in. I know it is supposed to be 2 1/2 from lightly seated but it is tight for at least 2 turns to fully seated.
I did check the A/F needle for damage and it is fine.
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Jim2
Posted on Sunday, November 06, 2011 - 04:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm not totally sure but I think the shim has an effect through the entire throttle range from above the idle circuit on up to full throttle. The shim will open up the passage because you are raising a tapered needle a fixed amount. This amounts to the equivalent of buying a different needle with a proportionally thinner taper. The passage is now that much larger around the outside of the needle. As the slide is lifted it takes the needle with it so that the passage is opened more and more as the slide raises. The passage is closed more and more as the slide lowers.
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Ratbuell
Posted on Sunday, November 06, 2011 - 08:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I've never messed with shimming.

S2: 45/195/2.5, thunderstorm heads, X1 cams, S1W race ignition box, Supertrapp muffler.

S1W: 48/195/2.5, stock thunderstorm motor, Buell race kit (complete).

M2L: 45/190/2.5, stock motor, Buell race intake/exhaust, stock ignition.

Dunno what I'm missing by not shimming...but they all run happy and make me grin : )
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Captainkirk
Posted on Sunday, November 06, 2011 - 11:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Main jet has not a damn thing to do with idle.
Idle is controlled by mixture screw and pilot jet.
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