Kawi2strokes.com Forum

Been hard to find good old days are over.

i've seen multiples on eBay over the past few months.....all doing well over 500.00 and as high as 800.00. I guess it depends on how bad you need one?

I am bidding on one now will see.

Can always fit a H1 trans in it....

I have never found an H1 transmission, save the H1R, to be strong enough for an H2. Some of the ratios are close, but the root diameters and number of gear flutes is lacking for the extra torque of even a stock H2 street bike.

I remember back at the end of 1972, when we all went to the factory, I asked Ken Yoshida why they hadn't done a 6 speed transmission, and he told me "too expensive", so, I asked, cost to build the full transmission, shafts, bearings spacers, gears shift drum, forks, circlips, the whole trans, related to U.S dollars of the day, wait for it, American funds for the whole transmission, $59.00, give or take a quarter of a dollar. The 6 speed would have brought the production costs to well over $68.00, U.S. funds.

Think about that.

Later, I asked Yogi from the Z1 assembly line why they didn't slather a line of Kawasaki Bond case seal on Z1 rubber inlet carb manifolds before bolting the manifolds to the head, as they got hot, bowed out, and leaked. Those leaks caused a fair amount of labor time in the dealerships to pull the carbs, and manifolds, add sealer, reassemble, all on warrantee funding. The answer I got, "that would cost the factory about a dollar, U.S. funds, TOO EXPENSIVE"

ONE DOLLAR MORE, and about a minute of added engine build time.

Yeah, what Dave said, a H1 box doesn't really work in a H2. I have done it before and there is enough difference in ratios to make a difference to how everything works. It's not happy in the lower gears. I mean why did Kawasaki bother to build another gearbox for the H2!? (I know they turn at different speeds etc.)

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"One day, your life will flash before your eyes. Make sure it's worth watching." : anon.

Ratios between both headsets are virtually same, the way they get there is the difference.

H1 has less area, and more teeth than same gear in an H2, because the finer teeth of the H1 cannot take the torque the H2 develops.

H2 with H2 gearbox, drag race with Z1....Win. H2 with H1 gearbox, drag race with same Z1...Lose. Not many have made this change to a street H2, the lower ratios are more linear in a H2 box.

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"One day, your life will flash before your eyes. Make sure it's worth watching." : anon.

Many have gone with the H1 trannies in H2s with no problems.

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

I'd think a stock H2 engine would be fine with the H1 transmission. After all, your 84 RWHP H1 stresses the trans more than that.

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If it surges, that's normal, upshift.