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  #1 (permalink)  
Old 08-31-2012, 11:17 PM
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Starter and Jackshaft Help...

Hello all, Im building a 250 pro street with a 100 inch RevTech (dont hate me) and a generic 5 speed trans, Im ready to purchase a starter and jack shaft but am unsure of the correct year for both items, I.E. 84-98 or 99-06, does anybody have any idea of how to tell by looking at the trans, or maybe the difference between the two starters also jackshaft teeth count, is this determined by number of teeth on starter ring?

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Old 09-01-2012, 11:09 AM
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Stick to mid 90's to 99'. For example FXST(C) 95' etc
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Old 09-02-2012, 06:20 AM
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Quote:
Originally Posted by IHCKoy View Post
Stick to mid 90's to 99'. For example FXST(C) 95' etc
+1. also, only problem i ever noticed is a BDL drive and a Spyke starter don't play well together. both are fine with other products, and when i called them, they both blamed the other, but just don't use that combo.
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Old 09-02-2012, 11:55 AM
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I've been hearing that alot from diff cats about the belt drives. I stuck to the oe chain drive, was cheaper and straight forward imo.
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Old 09-02-2012, 12:39 PM
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your primary kit is what determines what starter and jackshaft is needed. Either you have a 90-93 or a 94 and later style
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Old 09-03-2012, 05:20 AM
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Quote:
Originally Posted by IHCKoy View Post
I've been hearing that alot from diff cats about the belt drives. I stuck to the oe chain drive, was cheaper and straight forward imo.
definitely a matter of personal preference. after 10 years of constant leaks on my old shovelhead primary drive, i used a chain primary on the first chopper i built, and it even leaked at first, then got it sealed, but still decided i preferred a primary belt for no fluid, easier accessability if needed, etc. to each their own.
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Old 09-03-2012, 05:54 AM
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1989 to 1993 primary drives have a 66 tooth ring gear, and a larger diameter jack shaft bolt that goes into the starter and the starter shaft has a larger diameter thread inside for the bolt. I believe the bushing in the outer primary cover that supports the end of the jackshaft when engaged is also a different size than 1994 to 2006
1994 to 2006 primary drives (94 to 2005 on Dyna's) have a 10 tooth jackshaft for the 102 tooth ring gear and use a smaller diameter bolt into the starter. 1994 to 2006 starters are pretty much all the same. Some aftermarket starters come with two jack shaft bolts of two lengths and are tapped twice so either jacksahft can be used.
If your clutch has a 66 tooth ring gear you need a 9 tooth jackshaft, 102 tooth ring gear will need a 10 tooth ring gear.

Last edited by homemade; 09-03-2012 at 05:58 AM.. Reason: clearification
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Old 09-03-2012, 09:35 AM
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Thanks Homemade, thats what i was looking for.
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Old 09-03-2012, 02:25 PM
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89-93 is 1/4x20

94-06 is smaller 10/24 threads
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