750 crankshaft assy

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itsfixed

New member
Location
York, PA, USA
Hi guys from south central Pennsylvania, I recently bought a complete nos crankshaft assy for a 750 twin (I hope). I understand there a few slightly different versions. I cannot see any identification numbers. How can I tell what I have? Many thanks.
 
Weigh it and tell us how heavy it is... or post a piccie. :D

Unless it's for a Elettronica SFC, it will fit all other 750s.

piet
 
Hopefully the pictures come through. On a FedEx scale it weighs exactly 33 lbs (14.95 kg). It is a complete assembly with rods and all 4 man bearings.
 

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It's a standard Sf2 type crank - lighter than the Gt/GTl ones - will work in all the 750's with points ignition - the drive side main needs to be a roller type if using in motor after about  number 10500 Regards - Phil
 
Thank you very much!! Laverda in central Pennsylvania is all but non-existent so I bought this crank
while I had the chance. You guys are a fantastic source of information, keep it up!
 
Yes no problem, I paid $500. us dollars for it and I thought that was a good deal. The seller was indeed ebvc, he appears to be a straight up guy. His warehouse is 1 1/2 hrs from where I live so I drove there to see it first. I told him there are a few different cranks, he was not 100% sure what this one was due to no identifying numbers. He offered 100% money back refund if it turned out to be not what I need. I already knew I would buy it no matter what version it was due to its rarity. He showed me his warehouse just FULL of Ducati singles mostly, many earlier twins, numerous Guzzi and a few brit bikes, all looking like barn finds and no apparent runners. He also had a small crate of Laverda pieces, notably several nos cam chains and the like. I looked briefly through the box but perhaps I should look closer?? Me being a just retired VW tech for 39 yrs we have a tentative plan to bring 2 or 3 bikes at a time to my shop to see if I can breathe life back into them. If this works out I'll be a busy man! 
 
phil37 said:
It's a standard Sf2 type crank - lighter than the Gt/GTl ones - will work in all the 750's with points ignition - the drive side main needs to be a roller type if using in motor after about  number 10500 Regards - Phil
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Yeah, interesting ob, Phil. the ring groove on the drive side main is a dead giveaway that it's a ball. I have actually had an 11-ball drive main in my SFC crank for many years an miles with no probs, but wouldn't run a std 8-ball. Anyways, the roller is probably the best option.
Is the GT the only crank that used the stepped crankpin? or was it on the early SFs? (pre SF1 - 1972). Would it only be detectable by measuring the dia of the crankpin at the outside webs (32mm(?) stepped vs 36mm(?) for the parallel)?
 
Would it only be detectable by measuring the dia of the crankpin at the outside webs (32mm(?) stepped vs 36mm(?) for the parallel)? 
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Yes -only way to see without stripping it - would be a good find to make for a (relatively) easy "stroking" operation. Think only very early engines had the 32/36/pin. - Regards - Phil
 
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