Kawasaki H1a 500 Fork springs

Kawasaki H1a 500 Fork springs

Postby chris33 » Sun Nov 30, 2014 4:08 pm

Hi all

I'm currently restoring the above machine. Not far off. But I'd like to get the best from the front end. I've fitted bronze bushes and a taper head bearings fitted.

Does anybody know if anyone stocks fork springs for these early Ceriani 34mm fork?

If I get no joy, I will have to fit the later front end and probably run an 18" front wheel, but that's just an idea for now as I'd like to keep it looking original.

I'd like to find progressive one and maybe fit emulators as I read good things about these.

I've tried Hagons, hyper pro, John Ludz and a German company but cant remember the name. I've also found it really difficult even trying to get information out of other sellers about spring rates and sizes, it seems to be rocket science. As some other machines have similar forks just laterally thinking.

Any ideas from fellow owners would be really good as I don't fancy riding a 43 year old pogo stick.
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Re: Kawasaki H1a 500 Fork springs

Postby chris33 » Sat Dec 06, 2014 4:46 pm

Anybody?
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Re: Kawasaki H1a 500 Fork springs

Postby ja-moo » Sat Dec 06, 2014 8:07 pm

Get in touch with Works performance shocks. Ask for Andre and give him the outside diameter of your springs and length. Do not talk with anyone else or they will say they have nothing........
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Re: Kawasaki H1a 500 Fork springs

Postby chris33 » Sun Dec 07, 2014 5:47 pm

Would anybody who has ridden the early 500 with the 34mm forks recommend having a slightly heavier fork springs. I have a measurement of 0.827kg/mm or 46lbin so far, snatched from the internet but nothing concrete. I have found race spec doing a spring correct at length and for a 35mm fork at 1kg/mm.

Any info would be great.
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Re: Kawasaki H1a 500 Fork springs

Postby Hal » Sun Dec 07, 2014 8:53 pm

Why don't you ride it first and then go from there? I think you will find quite a number of other shortcomings with it, and further up the list if you are so concerened with the front end springs. :up
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Re: Kawasaki H1a 500 Fork springs

Postby eman » Sun Dec 07, 2014 10:45 pm

Just ride it as it is, learn to live with bucking, weaving and wobbles that's the character of the bike and makes it exciting. :)
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Re: Kawasaki H1a 500 Fork springs

Postby chris33 » Mon Dec 08, 2014 6:39 pm

What other issues have you had with the H1? What should I concentrate on? as I've just lifted the engine out.

I've ridden old machines mostly Yamaha RD's aircooled stuff and a Suzuki and there is always scope for making it better without bolting on a complete different set up.
Even just fitting new parts to make it ride like it should do and not with 40 years wear.

I thought id sort out the front end while I have the engine out, getting the crank sorted the only bit I cant do in my garage.

I know the forks are pretty basic internally (really basic). But my front springs are really old and frankly past it. You guys who have ridden it, do you think it's soft on the front springs?

I know changing fork oil to heavier or lighter has trade offs. so not going down that route.

Just trying to get a bench mark really and experiences from others. I know Maxton will do a slip in cartridge at the cost of a few pennies and some but I'm not racing the machine. Something I might consider if I get no joy down the simple route.
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Re: Kawasaki H1a 500 Fork springs

Postby Hal » Mon Dec 08, 2014 9:38 pm

I don't know of any specifics with the earlier forks, but I do know people have made improvements to the later disc brake ones - not with spring changes but by modifying the dampers.
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Re: Kawasaki H1a 500 Fork springs

Postby mraxl » Mon Dec 08, 2014 10:05 pm

Modern tyres with proper inflation can make a significant change in the "Pogo" effect. The 15" front is a plus.
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Re: Kawasaki H1a 500 Fork springs

Postby chris33 » Tue Dec 09, 2014 7:41 pm

15" front? is this the rim size? How does that ride, turn in quicker more twitchy?
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