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Buell Forum » Old School Buell » Archive through August 27, 2011 » Will a 86-90 4-Speed Sportster Flywheel fit « Previous Next »

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Flyingfinn
Posted on Thursday, August 11, 2011 - 09:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

This may be a dumb question but will a 86-90 4-Speed Sportster Flywheel fit in a 1999 S3 in a S3 .. If so what specifically do I need to make it work .. I got a good deal on this set of wheels and its all i need to get on the road


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Essmjay
Posted on Friday, August 12, 2011 - 10:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Not a dumb question, and I don't know the answer. I do know the 99 S3 has a lighter flywheel. If you were able to install the older heavy flywheels I wonder if it will give you back the low rpm tractor pulling feel of the S2.
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Blks1l
Posted on Friday, August 12, 2011 - 01:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Might also reduce some vibes, I don't know the answer, but I would think they should be interchangable, might try the XL Forum.
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Natexlh1000
Posted on Friday, August 12, 2011 - 02:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm pretty sure they altered the oil scraper of the cases to work with the thinner wheels.

I don't think you can just slap it in there without cutting aluminum.
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Oldog
Posted on Saturday, August 13, 2011 - 10:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Contact 1313 he may know, also try Fireman Jim
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Phat_j
Posted on Saturday, August 13, 2011 - 01:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

not a dumb question at all, 4 speed flywheels were the same as the older 5 speed wheels, but, with the changes to the pressed together flywheels, it will not "bolt in" however where there is a will, there is a way, but at that point it no longer becomes a "good deal".... short answer, no
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Notblues2
Posted on Saturday, August 13, 2011 - 02:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It won't work because a 4-speed has a completely different left side shaft from a 5-speed (of any year).

The pressed assembly came out in 2000 and it's very easy to put one of these into a 1999 motor if you find one.

(Message edited by notblues2 on August 13, 2011)
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