Standard bore is 64mm and stroke is 57mm giving a capacity if 183.3cc. Maximum oversize piston from Suzuki is 65mm but aftermarket piston are up to 66mm, giving a displacement of 195cc.
More help and information at suzukits.com
Cheers
Nigel in NZ
64mm
82MM is standard bore and 71.2MM is the Stroke
As far as I know bore and stroke is 66x57 but check to make sure.
64mm is standard but piston are available in 0.5mm oversizes up to 66mmMore help at the SuzukiTS.com forumNigel in NZ
The bore and stroke is---3.740 bore and 3.480 stroke. STOCK 305
What is the standard bore size of a 1987 suzuki rm250 1987
4.310 bore X 4.250 stroke -- basically a 454 bored .060 over with a 1/4 inch longer stroke crankshaft as compared to the 4.250 stock bore size and 4.000 inch stroke of a 454. Just as an aside FYI, 427's have the same stock bore size as a 454's but have a 3.760 stroke.
.7853x bore x bore x stroke x #of clyinders
4.000 inches -- same bore size as a Chevy 350, the difference is a 327 uses a 3.250 stroke and the 350 uses a 3.480 stroke.
3.68 bore x 3.126 stroke
You bore and stroke any piston internal combustion engine the same way. You replace the crankshaft with one with a longer stroke, or have the stock crank machined to increase its stroke. You also have to bore the cylinders to whatever size you want, within the limits of the cylinders, and use shorter connecting rods and larger pistons that match the diameter of the bore. Then you reassemble with the proper size main bearings and piston rings, and you have an engine with larger displacement.
Primarily the bore size. The 305 has a bore of 3.74 and the 350 is a 4.0 bore. They share the same stroke on the crank. And no, you can't bore a 305 to a 4.0 bore.