Q: Well hello and thanks for the best site in SA. I also understand that you guys are quite good with classic bikes, hence this mail.
I’ve just bought an old 1978 Kawasaki Z1R, which I’ve restored to near perfect condition, including brand new Bridgestone tyres, with the correct sizes from the Kawasaki manual.
The bike runs sweet but once I get above 150/160kmh the bike weaves quite badly. I’ve tried everything from tyre pressures to lowering, and raising, the front end by ‘slipping’ the forks through the front triple-clamps – but the problem remains.
So, do you informative guys have any answer to this, or, what I could I try next?
A: We presume that wheel bearings, head bearings, swing-arm bearings, chain alignment and the like are all correct seeing as you’ve fully restored the bike. The new Bridgestone tyres are the correct size so that’s not the problem, but we know what is.
During the late 70s not much attention was paid to aerodynamics on road-based motorcycles, especially the Z1R with its huge ‘bikini’ fairing. Believe it or not this is the problem. Do yourself a favour and take it off, exposing all your clocks and stuff, and go for a ride. Problem cured Lenny….
It’s just something you’ll have to live with because Bill used to own one and discovered the same problem, and cure…