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It’s a shame that the 1980 YZ125 cylinders exhaust is offset to the side because that would be an ideal direct bolt-on without going to the mad IT175 cheater cylinder.
Has anyone ever heard of anybody managing to sweat a 125cc iron sleeve into a smaller base cylinder? That would give a starting point of 56mm (123cc) with plenty of room for overbores.
The Shop
Regarding the forks, i think the disc is a bit of overkill. Given the nature of the bike and the power delivery, the more you can stay off the brakes and carry corner speed, the better you'll go! Maybe the earlier 175 forks could be an option, then make a twin-leading shoe front brake fit? See the guy in the pic above has fitted the IT swing arm, i might give that mod a go.
I too thing think the disc is overkill but looks trick as hell.
Watch the youtube vids of those former factory riders on these bikes and it seems they never use the brakes.
I mean.......you want to keep these bikes light as possible.
Why is it you want a old yz100 again? They make bikes with all those things on them already
It was a great day up there with the evos although a bit warm for me
Pit Row
The YZ 100 is my secret desire a couple of friends had them in schoolboys but I ended up with a Kx 80 to then upgrade to a cr in 84
There are very few about
I would go for the 175cc, its only cheating if you win..
You've got cheaters and you've got losers.
Seems that the inner bronze bushing within the clutch basket/hub is just a bit worn, The clutch assembly rocks/wobbles on the spriral grooved insert as a result of the bushing wear. It's ever so slight but it's one of those things that bugs me. Now then, is there a way to press the bushing out of the hub and replace it? If not, maybe the bushing can be knurled to "tighten up" the tolerance and eliminate the wobble. FYI, the grooved insert fits nicely over the drive shaft and is not a cause of the problem.
Looking forward to a few upgrades from this post.
Greg
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