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I have it on good authority that there was such a thing, an oversized cylender/sleeve and piston set, the whole top-half, minus head, that was supposed to bring the displacement up to almost 1500cc's. I was told this by 3 people, one the owner builder of one, and the owner and builder of another, (so 3 experts on 2 bikes) that this was done to these. I rode one of these (this is the one that the owner got from the builder becasue the original owner who comissioned it, took it for a 5 minute test ride, brought it back pale and shaking, and without a word simply left it, and wasnt ever heard from agian... must have really scared him!) and it sounds like the truth, that sucker was really fast, and just sounded bigger, period. I know that the GS1000's were about the only things that gave the Harley-Davidson's any real competition in motorcycly drag racing for at least a decade, so there had to be an aweful lot of performance parts made for them, but I havent had a lot of luck finding any info. I just bought myself a '78 GS1000 (previously owned a '79 GS1000, a GS750, GS550 and a GS650) and I'll need to do the usual mods, anyway, thought I'd ask if anyone knows what I'm talking about.
The usual mods include (this is based only on my own experience, stuff that they just plain have to have done to them to be ridable) for ALL older Suzuki's: The addition of a ground wire from the regulator/rectifier to the ground on the battery- these were inproperly grounded by design oversight- rubber bushgings between that and the frame, and the only ground connection.... no more dead battery syndrome
For any Suzuki's prior to 1980, the retrofitting of a 1980 or later electronic ignition system, bye-bye breaker-points.
And the introduction of 30wt fork oil: I had the "assembly" pamphlet that the dealers got from Suzuki (this is the one that instructed how to take what came in the crate, and assemble to what you'd see on the showroom floor, they come "some assembly required", to fit in a smaller crate), and they actually said to mix 30wt motor oil and automatic tranny fluid 50/50 for the front forks, and that should have been how they were sold new, that is litterally what the factory instructed the dealers to use for the new bikes!
Last: My GS650 came to me with 4 into 4 chrome pipes with "cherrybomb" type exhaust tips/mufflers (though completely hollow when I got it) installed by one of it's previous owners, I just LOVED those (they were why I got the thing), unfortunately, they were too small to fit anything larger, anyone ever heard of 4 into 4 exhausts for a GS1000?
The usual mods include (this is based only on my own experience, stuff that they just plain have to have done to them to be ridable) for ALL older Suzuki's: The addition of a ground wire from the regulator/rectifier to the ground on the battery- these were inproperly grounded by design oversight- rubber bushgings between that and the frame, and the only ground connection.... no more dead battery syndrome
For any Suzuki's prior to 1980, the retrofitting of a 1980 or later electronic ignition system, bye-bye breaker-points.
And the introduction of 30wt fork oil: I had the "assembly" pamphlet that the dealers got from Suzuki (this is the one that instructed how to take what came in the crate, and assemble to what you'd see on the showroom floor, they come "some assembly required", to fit in a smaller crate), and they actually said to mix 30wt motor oil and automatic tranny fluid 50/50 for the front forks, and that should have been how they were sold new, that is litterally what the factory instructed the dealers to use for the new bikes!
Last: My GS650 came to me with 4 into 4 chrome pipes with "cherrybomb" type exhaust tips/mufflers (though completely hollow when I got it) installed by one of it's previous owners, I just LOVED those (they were why I got the thing), unfortunately, they were too small to fit anything larger, anyone ever heard of 4 into 4 exhausts for a GS1000?
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