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wera90ex
Guest
My business card.
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wera90ex
Guest
warning! warning! Just remembered something, if you use the GR 650 pistons in the 450/500. You have to fly cut the pistons for valve clearance. Nothin' big ,about what you have with a GSX400 piston.
Also, You'll have to shave some under the wrist pin to clear the crank. I'm sure I have some pics somewhere I just have to find them.
Sorry,Some of these mods were done 20 years ago and it's a bit hard to remember. Don't worry, it'll happen to you youngins too. Your mind will turn into a fine kitchen tool.....................a sieve. RG
Also, You'll have to shave some under the wrist pin to clear the crank. I'm sure I have some pics somewhere I just have to find them.
Sorry,Some of these mods were done 20 years ago and it's a bit hard to remember. Don't worry, it'll happen to you youngins too. Your mind will turn into a fine kitchen tool.....................a sieve. RG
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Guest
Guest
What was the best combination you've made ?
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jfman
Guest
sweet bikes!
You need to stick around some more as theres many things we can learn from you.
You need to stick around some more as theres many things we can learn from you.
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wera90ex
Guest
The white GS 500 was the best all around performer.
'02 gsxr 750 front end,3.5 wheel,'92 GSXR 600 aluminum swingin' arm/w Penski shock,600 lb spring,4.5 wheel, 555cc motor w/.417 megacycle cams,shim under and 39mm Keihin CR specials with Yoshi exhaust.
As much as I loved ridin' this bike it just wasn't fast enough for the tracks I was riding and the classes I was running in.
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Big Rich
Guest
Sorry I'm late to this thread, but what interferes with the GR pistons exactly? I'm not sure I'm understanding why there would be valve clearance issues.
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Guest
Guest
Wow how did I miss this thread???!!!
Wera... mate I love your business card... which combination is that one?
Wera... mate I love your business card... which combination is that one?
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jfman
Guest
Why is it that the whole GR650 motor doesnt work?
What does the GR650 actualy share with a gs500/450/400?
Also about the GS 500 engine: mekanix said the shift drum is reverse, wich doesnt bother me it would have built-in GP shift. BUT is the rest of the stuff compatible(besides the head) the electronics are compatible or do the old electronic bolt into a gs500? the cases are the same and they will mount up?
What does the GR650 actualy share with a gs500/450/400?
Also about the GS 500 engine: mekanix said the shift drum is reverse, wich doesnt bother me it would have built-in GP shift. BUT is the rest of the stuff compatible(besides the head) the electronics are compatible or do the old electronic bolt into a gs500? the cases are the same and they will mount up?
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Guest
Guest
The GR motor doesn't bolt right up and its too tall to fit in the frame.
But if you want to make it fit there are ways
It doesn't share anything really except for the camshafts and sprockets. Those can be easily swapped out to any of the other bikes but the cam profile isn't that great. Its got lift but really low duration compared to the 500.
Maybe a few bolts are the same but for the most part its a one of a kind beast.
The gs twin base after 1980 is the same up until 2004. Same case and parts. Although some are upgraded a bit with better bushings. The clutch was upgraded and the pushrod was made a two piece.
2004 + have a different lower case to allow for an oil cooler.
The shift drum is one difference, but really it doesn't matter but you do have the choice of which ever one you want to go with.
The oil pump on the 500 got new higher ratio gears for more pressure/volume.
The electronics are a one or the other kind of thing. Use the mechanical advance with the ignitor that doesn't do the advance. Or use the stationary rotor that has the advance curve built into the ignitor. The only difference between the 500 and any other one is how soon it advances. But you can put the plate on any twin 80+ engine and it will fit and bolt up like it was stock.
That means that the gs500 ignition and parts are a direct replacement and upgrade for the gs400-450.
