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Old 03-10-2014, 04:24 PM   #1
Jim Day OP
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YZ fork upgrade

Someone offered me a 98 YZ450 fork to play with. Anyone build a GS with one? Pros? Cons? Looks like the lower bearing ID is larger but the outside OD and taper appear to be correct, upper bearing looks spot on but there might be an issue with the spacing and I think I'll need to do some lathe work and make an adapter. I'm thinking 21 wheel front on a 70s bike, with just enough shaft and swingarm extension to balance it. I might even try to go with a somewhat stock looking 19 on front for more of a scrambler look. I've not looked into it so wheel, disc, and brake (nissin?) info would be appreciated.
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Old 03-10-2014, 04:38 PM   #2
Box'a'bits
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I did an 05 YZ250F fork conversion here. I think the same basic principles apply.
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Old 03-10-2014, 04:44 PM   #3
villageidiot
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you could always reduce the height (and travel) of the yz fork to maintain balance...... shorten up the travel to like 8 inches from 12, and balance the rear to it.
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Old 03-10-2014, 05:11 PM   #4
Jim Day OP
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Quote:
Originally Posted by Box'a'bits View Post
I did an 05 YZ250F fork conversion here. I think the same basic principles apply.
That looks like pretty much the same fork. Late 90s 46MM. So the obvious question is are you happy with it?
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Old 03-10-2014, 05:12 PM   #5
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Originally Posted by villageidiot View Post
you could always reduce the height (and travel) of the yz fork to maintain balance...... shorten up the travel to like 8 inches from 12, and balance the rear to it.
That's exactly what I want to do. Is there a thread on it?
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Old 03-10-2014, 05:38 PM   #6
hardwaregrrl
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Hey Jim, I think Pvangle used a YZ fork on his HP1 build. I feel like it was off of the 426....lemme see if I can find it?


Here it is
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Old 03-10-2014, 06:56 PM   #7
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Originally Posted by hardwaregrrl View Post
Hey Jim, I think Pvangle used a YZ fork on his HP1 build.

Nice build!!!
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Old 03-11-2014, 04:33 AM   #8
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Nice build!!!
It is...but my friend has owned the bike for 2+ years and cannot sell it. I have some access to it if you need specifics.
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Old 03-11-2014, 05:30 AM   #9
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It is...but my friend has owned the bike for 2+ years and cannot sell it. I have some access to it if you need specifics.
Pvangle did a great job, but that thing needs to finish its development. Unfortunately, they never seem to pull back in money what went into them in love.
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Old 03-11-2014, 05:44 AM   #10
hardwaregrrl
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Pvangle did a great job, but that thing needs to finish its development. Unfortunately, they never seem to pull back in money what went into them in love.
It's finished. They rebuilt the trans, carbs, swapped FD, put a tombstone on it, got rid of the tiny Bultaco tank. Not sure what they put on it but it holds more than a gallon....and played with the suspension...front was way too chopperish. But at 4100usd, no one is interested.
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