Identifying shift drums....... - MVAgusta.net
 
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post #1 of 8 (permalink) Old 07-27-2011, 09:57 AM Thread Starter
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Identifying shift drums.......

Did a search and couldn't find anything saying how to identify a shift drum. I found part numbers but MV is so bad about putting part numbers on things i couldn't find anything on the drums i have. These are currently still attached to transmissions. Which, by the way, would be nice to be able to find out if the trans are oem gears or close ratio.

If anyone can help me get this figured out that'd be great.
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post #2 of 8 (permalink) Old 07-27-2011, 06:54 PM
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Maybe adding pictures would help ?

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post #3 of 8 (permalink) Old 07-27-2011, 07:11 PM
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varium, here you go:

the stock transmission 1st gear is 38X13 or 2.923:1
the CR transmission 1st gear is 37X14 or 2.642:1

so just count the teeth on 1st gear, the ones farthest to the right

see the button head rivet in the drum?

if the closest groove is a straight section its normal pattern

if the closest groove ends at the rivet its a reverse pattern drum

this is in neutral, simple right?



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post #4 of 8 (permalink) Old 07-28-2011, 11:58 AM Thread Starter
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Had to wait for the rain to pass to get some decent pics. Below is on of the shift drums from both sides.



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post #5 of 8 (permalink) Old 07-28-2011, 12:00 PM Thread Starter
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knurl: You are speaking of the gear on the top in this pic, right? The one furthest away from the mounting plate.


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post #6 of 8 (permalink) Old 07-28-2011, 12:02 PM
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Come on Noel, I'm waiting . No really, I want to know too.

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post #7 of 8 (permalink) Old 07-28-2011, 01:25 PM
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?

varium, yes farthest from the plate or or the right side of the bike

thats a reverse pattern drum on a stock ratio transmission (if i counted 38 teeth correctly)


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post #8 of 8 (permalink) Old 07-29-2011, 01:27 PM Thread Starter
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Thanks for the confirmation. Looks like i have 2 reverse shift drums on standard tranny sets.
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