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Help identifying cylinders/porting.


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Picked these cylinders up for pretty cheap. Cool head and Pistons included. I couldn't find anything when researching the WSM number. Anyone know what the bore based off the piston number? Also is anyone familiar with that logo? Anyway to tell if they are 4mil or stock strike cylinders other than mounting them up? Thanks in advance. b2d375450fc1f72367a124eb4ebabec1.jpgfac1c73ef08e0001fc9a813b8d8eb557.jpg

 

 

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Side pic of the logo, and get photos of the intake, the transfers on the bottom, the ports from the top down and a shot of the exhaust.

 

You mentioned you got a head with it. Are the domes stepped? It would help you know if ya 4mm or not.

 

I believe that is a 65mm piston as well.

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Side pic of the logo, and get photos of the intake, the transfers on the bottom, the ports from the top down and a shot of the exhaust.

 

You mentioned you got a head with it. Are the domes stepped? It would help you know if ya 4mm or not.

 

I believe that is a 65mm piston as well.

I got ya. I havent received them in the mail yet and these were the only two pictures I have. I'll follow up with some more pics when they come in.

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I think those are sleved stock cyls and 70mm bore wsm pistons. The domes can tell you if its 4mm. Be carefull with the studs because they likely have heilicoils and can be a pita if you pull one or they arent straight

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They are big bore right??

Wsm sleeves go to 70.5

On that piston it says wsm 7000

Do you see how the sleeve is so large it goes into the stud threads. Some have heilicoils.

You got them cheap because they are probobly junk. Maybe you can get a time or keen cert to work if those heilicoils are screwed up

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They are big bore right??

Wsm sleeves go to 70.5

On that piston it says wsm 7000

Do you see how the sleeve is so large it goes into the stud threads. Some have heilicoils.

You got them cheap because they are probobly junk. Maybe you can get a time or keen cert to work if those heilicoils are screwed up

Woah. Good eye. Those fuckers prob run hot now that you pointed that out.
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you meen choked worse than they already are. its a shame yamaha didnt widen the bores another 20mm or so

Agreed. If that was the case, you would be seeing 100 hp stock cyls that have curves like JD's redline 4mm with SLP's. There are Spread Bore Cyls and cases for the bigger stroke stuff.

 

This is the exact reason why the modern 250cc stuff can make such good power for their size. One big single cylinder with massive amounts of transfer, all the while there is still tons more material to remove.

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