Can I use a big bore piston/cylinder on a stock crank?

[Will'smotobikes19]

I think that's cheaper than belmetric the shipping is alot from them. @ crassius the original motor had the different size thread on either end but they were bent. So I ordered the SBP studs but now since I'm using a different block I need the 1.25 studs. Good thing about the 1 m rod is you can make them as long as you need.

 

[crassius]

yeah, I use up a LOT of threaded rod here : )

 

[Will'smotobikes19]

Got the carb

 

[Will'smotobikes19]

Working on spacer.

hand drills are a pain they always walk. Had to correct it by punching and drilling pilot holes.

 

[Will'smotobikes19]

Almost done have just a hacksaw, drill and small file. Not too bad for hand tools. Cut my finger on the hacksaw though. Just have to break the middle out and do more filing. Might have to lap/sand it depending on where the piston is.

 

[Driver4life]

What about making a 1/8 aluminum plate with 2 thin base gaskets. Would that work?

 

[Will'smotobikes19]

Well 2 years later that crap cylinder dropped the sleeve and permanently locked the engine. THE CYLINDERS ARE PRODUCED INCORRECT DO NOT BUY MZ MIAMI "BIG BORE" cylinder. It is a 38mm NOT a 40mm and has basically no advantages. You need to use a 38mm bottom end engine with the 48mm MZ miami cylinder. The piston rings hit the liner and blow off the top of the piston and then it seizes! much better to have a machine shop make a cylinder the right way.

 

[Spare_Parts]

Well 2 years later that crap cylinder dropped the sleeve and permanently locked the engine. THE CYLINDERS ARE PRODUCED INCORRECT DO NOT BUY MZ MIAMI "BIG BORE" cylinder. It is a 38mm NOT a 40mm and has basically no advantages. You need to use a 38mm bottom end engine with the 48mm MZ miami cylinder. The piston rings hit the liner and blow off the top of the piston and then it seizes! much better to have a machine shop make a cylinder the right way.

2 years? Should have got a 4 stroke!

 

[nJectionz]

2 years? Should have got a 4 stroke!