AM jug concern

[RocketRoss57]

Got this AM jug from my cousin. It is a no-name chinese jug. I was looking it over to check squish and noticed that the piston is quite a bit above the exhaust port floor at BDC. Is this normal? By the way this is a 064 with a AM 660 slug and jug.

 

[Wagnerwerks]

Factory? Nope. But if it runs.... Who cares

 

[RocketRoss57]

Factory? Nope. But if it runs.... Who cares

True. Just wondering if it would be robbing me in the long run or would be unnoticeable? Just doesn't seem right.

 

[tree monkey]

no problem, run it

 

[sawgarage]

True. Just wondering if it would be robbing me in the long run or would be unnoticeable? Just doesn't seem right.

There is little/no flow with the piston that low in the port... the big deal on the exhaust side would be free-porting... of course, making sure the ching chong cyl's have a rounded port roof entrance and chamfered edge is important to piston life as well....

 

[drf256]

Looks pretty normal to me. I've seen many saws with a similar geometry, even oem.

 

[RocketRoss57]

Thank you fellers. I appreciate the feedback. There is no free porting and I went over all the ports and chamfered them. I'll continue with assembling the saw and give her hell.

 

[Adirondackstihl]

Yep
Normal
Run it

 

[J_M____]

Looks fine, my 036 looks just about the same with the factory cylinder (with gasket delete)

 

[RocketRoss57]

It lives.

 

[RocketRoss57]

Got to cut with it now. Clutch still not fixed... Just had to though.