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 Post subject: Shift fork wear
PostPosted: Mon Apr 04, 2016 2:16 pm 

Joined: Thu Sep 29, 2011 9:44 pm
Posts: 37
Location: Taylor Mill KY
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How bad is too bad?


Last edited by kawboy on Mon Apr 04, 2016 6:13 pm, edited 1 time in total.

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 Post subject: Re: Shift for wear
PostPosted: Mon Apr 04, 2016 2:17 pm 

Joined: Thu Sep 29, 2011 9:44 pm
Posts: 37
Location: Taylor Mill KY
The upper fork is in pretty nice shape

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 Post subject: Re: Shift fork wear
PostPosted: Mon Apr 04, 2016 6:16 pm 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
If you can feel any kind of grooving, then it needs to be replace. heat discoloration hasn't been a problem.

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........


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 Post subject: Re: Shift fork wear
PostPosted: Mon Apr 04, 2016 8:40 pm 

Joined: Thu Sep 29, 2011 9:44 pm
Posts: 37
Location: Taylor Mill KY
Good deal. I can probably get away with replacing one lower fork then. The discolored one isn't really worn very much. The other lower is worn pretty deep.


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 Post subject: Re: Shift fork wear
PostPosted: Thu Jul 20, 2017 7:17 am 
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Joined: Tue Jul 12, 2011 11:39 am
Posts: 78
Location: Cleveland, Ohio
Ja-Moo wrote:
If you can feel any kind of grooving, then it needs to be replace. heat discoloration hasn't been a problem.


Not trying to hijack this thread but was going to post up the exact subject and found this thread...attached is a pic of my forks...the one closest to my depth gage appears to have the most wear...as shown, the wear pattern is only .009" deep...

Are these at all servicable in that I have access to a surface grinder...can I redress the surfaces that have the wear marks? Are there service limits? Though I do have very minor wear/grooving, is .010 going to break the bank in order to clean them up?


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 Post subject: Re: Shift fork wear
PostPosted: Thu Jul 20, 2017 8:44 am 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
As I posted , if you can feel a groove, it's done for in my book. I think someone does refurbishing now, not sure who though.

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........


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 Post subject: Re: Shift fork wear
PostPosted: Thu Jul 20, 2017 9:42 am 
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Joined: Tue Jul 12, 2011 11:39 am
Posts: 78
Location: Cleveland, Ohio
Ja-Moo wrote:
As I posted , if you can feel a groove, it's done for in my book. I think someone does refurbishing now, not sure who though.


I sort of figured--I was only asking because it is less than .010".

In order to do a weld build up, it would most likely require a preheat 250 to 400, and a TIG process utilizing high nickel wire...and then and extremely controlled cool down period with jackets or heated sand...then of course the grinding to finish. From all of the reading I've done these forks seem to be one of the weak points of this tranny.

Has there ever been a group buy affording some discount? Looks like I'll be in the market soon :roll:

I might look to try and repair them myself.

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 Post subject: Re: Shift fork wear
PostPosted: Thu Jul 20, 2017 10:06 am 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9826
Location: North Central NC
John, he was asking about grinding them about 0.010" to get rid of the roughness, not whether he can use them as-is. I'd think that would work great, but I have little transmission experience, so my opinion might not be worth much.

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 Post subject: Re: Shift fork wear
PostPosted: Thu Jul 20, 2017 10:18 am 
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Joined: Wed Jun 08, 2011 10:23 pm
Posts: 3821
Location: Colorado Springs, CO. USA
A couple of vendors sell new ones for H1 and H2 (so far as a set). Little pricey but if ya need'em ---- buy'em.
Diablo for example says:
"New shift forks ...... common problem and well known weakness of the H1 and H2 triples is the transmission shift forks.
Very high quality remanufactured using the latest in metallurgical advancements".

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 Post subject: Re: Shift fork wear
PostPosted: Thu Jul 20, 2017 10:56 am 
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Joined: Tue Jul 12, 2011 11:39 am
Posts: 78
Location: Cleveland, Ohio
BarryB wrote:
A couple of vendors sell new ones for H1 and H2 (so far as a set). Little pricey but if ya need'em ---- buy'em.
Diablo for example says:
"New shift forks ...... common problem and well known weakness of the H1 and H2 triples is the transmission shift forks.
Very high quality remanufactured using the latest in metallurgical advancements".


I saw those Barry--I appreciate the nudge and vendor info...ultimately If I have to hemmorage the money I would probably go with Diablo :think: ideally they would live on forever given routine maintenance, etc...what are some of the primary causes for grooving and the wear patterns to develop?
Improper or lack of shimming?
Rough finish on the gear faces that could be cleaned up?
Thrashing? :lol:

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