I found this, which puts my fear to rest that it may have handled like a pig.
https://www.facebook.com/post.classi...72827293031693
With the removable r/h lower frame tube, I will attempt to put the stripped frame on to the motor(1135 to start with) & see if it fits, as its probably easier to wield 8kg's of frame than 100kg's of engine.
It had a 16 on the front and a 18 on the rear by the time that you take into account the tyre widths and profile changes onto modern 17's it will have the same ground clearance. Question is what forks and wheels did the original run anyway?
Do you know what the SSX400 had 17 front and rear in 125GP/ MOTO 3 sizes anyway.
Front Tyre
110/80-17
Rear Tyre
130/80-17
Close enough looking if it had std wheels and the same widths or maybe wider than a GSX1100ef of the era
Koosman used to widen std GSXR wheels in the states the same way as they used to do steel car wheels here in the 70's and 80's.
He even used to even change the sizes using different beads
The advice from Rob to use 17's is pragmatic - and realistic. Also I believe he loves the Moriwaki on 17's rather than the original 18's...
i wouldn't use Impulse rims even if they look like what was used. From memory they're 3 inch front and 3.5 rear, but more importantly the wheel bearings are too close together. On a light bike, no problem, heavy bike and they cut out quickly cos of the narrow load bearing base. Saw it frequently in the 90's when scrutineering as they were a popular wheel to use.
At the time I'd think the original bike used the GSXR400 forks. They're 38mm stanchions and actually a pretty good fork even if they have a crude anti dive.
My 500 kawasaki F3 bike uses those sliders on the Kawa stanchions to get twin disc fitting.
yep....I've got to know well the man who helped write the Aussie Pre 82 rules years ago. He said they allowed 17 inch wheels in to give riders a sporting chance of staying upright and not hurting themselves. His view was that 17's would give the grip to go with the motors they would inevitably build (usually first, before the chassis....)
Personally I am more concerned with Bobs bike looking right, rather than his personal safety.
Why the heck did they use impulse wheels on other bikes (when they didn't have too) they are bloody ugly.
Was it just because all the original impulses engines had fried their alternators?
The RG500 Had a 17 inch rear rim but it looks narrower than a Impulse as it carried a 120 tyre.
Found these GSX600-F 88-97
Front tyre: 110/80-17
Rear tyre: 140/80-17
this is the air cooled bike Grumph was referring to ealier
it had the air cooled GSX1000 donk in a works frame in 1984
Its called the XR41
http://www.good-bits.co.uk/2015/02/s...41-gs1000r-f1/
http://www.good-bits.co.uk/wp-conten...2/IMG_4883.jpg
http://www.good-bits.co.uk/wp-conten...2/IMG_4883.jpg
http://www.good-bits.co.uk/wp-conten...2/IMG_4857.jpg
It's being built for pre 89 period. marvics were pretty common here and oz in race circles anyway, by the mid 80's so a Marvic lookalike type of rim will be acceptable.
Impulses got written off in big numbers for many reasons. 17's were not that plentiful in reasonable widths at wreckers in NZ so Impulse rims appeared on a lot of BEARS bikes among others. At any given Canty meeting in the late 80's I'd toss out at least one bike with shot wheel bearings.
wrong....The XR41's the poms raced in TTF1 had the 8V GS1000 motor in (like the picture) until F1 went 750. Then they put the GSX750 motor in for a couple of years till the GSXR750 came out. Then the bikes were sold off. In the US yoshimura used the GS1000 motor until their F1 went 750 when I believe they concentrated on Superbike till the GSXR came out. Don't know if yosh USA ever got the alloy frame at all. They raced the GSX1000 Katanas in Superbike of course.
I'm very grateful for all the input & no doubt this thread will shape my decisions on what to use in the build.
It just occurred to me that I could build it as a road legal race replica, that would probably be more fun & useable than coming 7th in pre '89, it's unlikely to get near the front runners. Although it's another rego to keep up on & I do have plenty of road bikes, oh, and race bikes.
What a dilemma.
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