Author Topic: Swapping Cranks and Cylinders  (Read 3204 times)

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Offline Al Smith

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Re: Swapping Cranks and Cylinders
« on: November 06, 2012, 02:51:52 pm »
A little fly in the ointment .According to the IPL's the super 250 uses a ball bearing on the clutch side while a standard 250 uses a needle bearing .Which is not to say you can't use a needle with a super crank providing the shaft size is the same ,dunno .

An I-70,Super 44a is a right hand start saw which uses a right thread nut so you don't spin the clutch off starting it ,keyed clutch which has a tendency to tear out the keyway which is why in later years Mac used just the taper to hold the clutch,no key .A standard 250 uses a left hand thread screwed on clutch .

Now then  the rods on a 250 and a super are the same which I assumed them not to be  but they list a different piston so I assume if you use a standard 250 piston with a long throw crank  you'd  chunk it through the head deck .

I-75 have no idea .It's not on my micro film nor in the big black book that weighs 20 pounds .According to Mike Acres site they only made it a year .So reading between the lines it's rare as a hens tooth .

Now before you get the idea you can take a crank from a 650 gear drive here's that deal .They are also rare as a hens tooth .That I know of they were made for 10 months .I have one,Mike Acres has one and there are only two others I've heard of .Besides being a geardrive that crankshaft is not designed to run a direct drive clutch .

 

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