Mrs Nudey's new bike

[MSTRS:Me]

They would be the ones known only as GPZ/GPXs. The EX may have had changes other than just styling and 17s...
I believe there was a race class way back, such as today's Pro-twins, and the Kwakas used to clean up.

[T.W.R]

From what John at Boyle Kawasaki was telling me, apparently the early 500's (the 16" wheel ones) are lot quick than the later ones.

The one my mate had was the pearl white with red seat & black rims model and it'd run to an indicated 215km/h, enough to keep a SE katana honest anyhows used to be funny watching them scrapping with eachother as they were complete opposites : very slightly built dude on the Kat & a Gorilla on the GPZ

[nudemetalz]

I always remember in the late 80's there used to be a pink and green GPz500 race in the F3 class (Bill, you may remember this). It was blardy fast and used to clean up.

[Grumph]

That was Tony McMurdo from Wgtn - won F3 2nd & 3rd seasons on that thing.
First time he brought it South - to the GP - I had a ride in practise. Frame (VF750) flexed badly.
Showed up at my slow speed because I'm about 30Kg heavier than Tony...1 inch high reinforcing added on the top of the frame spars for the next season.

Still got my race one in the barn - should probably hook it out & rebuild it for pre 89..

If the missus gets bored with it as a 400 I've probably got enough spares to put a 500 top end on it for you - and some spare cams for the Megacycle profile Kelford copied for me.

[nudemetalz]

Ah Tony McMurdo, that's the fellah !!!

The 400 has a different bore and stroke to the 500 so top ends wouldn't be interchangeable I would think.

[Grumph]

Ran a rule over a 400 once - the barrells appear to be the same height so I'd imagine longer rods.I know the gudgeons are the same size and the top end stud spacing is the same. Cam chain length is the same too.
Would't be a full 500 - but worth doing if the bits were available at the right price.