Pootler
My GPZ400r has the clutch rattle at idle that Kawas seem to get. Is it worth worrying about? from what Ive read overseas you just ignore it but am happy to replace the clutch later on as funds allow our not bother. Clutch functions fine.
The attached pic is one of my mufflers, is it worth trying to debaffle it? Will it improve HP? Not really looking for more noise.
Originally Posted by Katman
Pootler
I will add the pic this time.
Low personal B.M.E.P.
The rattle is actually the shock absorbing backplate. These Kawas have rubber shock absorbing inserts in the backplate rather than the more usual springs. The rubber takes a pemanent set giving a certain amount of free movement.
Many years ago I replaced the rubbers with a set of urethane inserts I made up. Worked well but probably too much work to be cost effective when the standard fix is simply to turn up the idle....
As soon as you debaffle the mufflers you're going to be asking about carburation problems......
Pootler
OIC. Ive not had it apart. Only get it at cold idle.
Im happy to re-jet carbs to suit if there are real gains to be had.
No8 Wire Extraordinaire
Why would there be any gains? Its an 80s 400, it is what it is.
Don't you look at my accountant.
He's the only one I've got.
Pootler
As in they are quicker than modern 400s, yes i agree.
No8 Wire Extraordinaire
what is a modern 400? do the japs still make em for the local market?, thought they had given up bikes.
Don't you look at my accountant.
He's the only one I've got.
Jam and tarts....
If you need a clutch basket, try find if a ZZR400k one will fit, I've got a complete clutch with new linings and spare second hand linings I'll be happy to get some money stuff for? Clutch springs included
Off to google.
Alloy, stainless and Ti polishing.
Bling your bike out!
PM me
Pootler
Wonder if they fix the rattle useing springs?If you need a clutch basket, try find if a ZZR400k one will fit, I've got a complete clutch with new linings and spare second hand linings I'll be happy to get some money stuff for? Clutch springs included
Off to google.
Jam and tarts....
Possibly? Could even be a loose hub nut on the clutch?
I can't find a parts fiche for the GPZ400 so can't compare part numbers
Alloy, stainless and Ti polishing.
Bling your bike out!
PM me
Smarty pants... since ages ago
Some gain with an aftermarket exaust system maybe ... with correct jetting done at the same time. Hacking the old one, usually just gives you more noise ... even with re-jetting. Single figure % of horse-power increase's ...
Make the most of what you have ... you should keep up with bigger bikes under 180 km/hr. Through the windy's ... be ahead ...
When life throws you a curve ... Lean into it ...
Jam and tarts....
Not any modern ones
Alloy, stainless and Ti polishing.
Bling your bike out!
PM me
Pootler
From the post above sounds like something to do with Rubber being used instead of springs. Lots on internet about the noise and most say just bring up the idle.Possibly? Could even be a loose hub nut on the clutch?
I can't find a parts fiche for the GPZ400 so can't compare part numbers
Pootler
Dont really want more noise so will ride it as it is. Will check plugs to see how she is doing at the moment.
Smarty pants... since ages ago
More would depend on the rider ... more than the bike ... Unless it's a Ducati ... then you don't try.Not any modern ones
When life throws you a curve ... Lean into it ...
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