Big bore kits gs450

[Guest]

looking for any info on a big bore kit for a 1982 GS450T

[BassCliff]

Greetings and Salutations!!

Hi Mr. TyFerris,

I don't think there's any such thing as a big bore kit for a 450. If you've got the skill I suppose you could put in a pair of GS500 pistons. The motors are very similar. But for all the expense and time, I think it would be cheaper and easier just to buy a bigger bike.

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[Mekanix]

Well, how brave are you ?

http://www.thegsresources.com/_forum/showthread.php?t=172422

More info:

http://www.thegsresources.com/_forum/showthread.php?t=170287

After 1980 i believe the gs400 425, 450, 500 have the same base engine and only change the cylinder block and head. Before 1980 the block had roller bearings and the head configuration doesn't line up properly with anything after 1980.

If you bore your cylinders from 71mm to 74mm that would make it a 486cc.

75mm would make it a 500cc and you would only have 2 mm sidewall left.

I'm assuming that you have a 4mm sidewall when the bore is stock at 71mm.


Big bore kits for 750's can be applied to the twins if you can find them.

http://gszone.biz/pistons.html

The gs4xx piston's have an 18mm wrist pin.

The 1100's have more options for pistons but I'm not sure how the valve recesses would compare and they might require modification.


Cometic makes 450 head gaskets in what ever size bore you want starting at $48 for felt type and $57 for copper reusable gasket.

http://cometic.com/powersports.aspx nothing on the website but if you call them they do have stuff available in their database


It is possible, not cheap, Performance would increase, but would it be enough to satisfy?


Oh one more thing , It has been done

http://www.youtube.com/watch?v=tQEVHd1cSyw

Its a 450 with a 500 cylinder block bored to hold GR650 pistons. That makes it a 527. I think the head is from a 500 but i can be sure which year.