jb-chainsaws
Pinnacle OPE Member
so I picked up an 038 mag today with a scored top end, hoping to resurrect it.
I've got a company that can re plate cylinders at a good price as a friend who owns a trials bike shop uses them a lot, so I get mates rates.
However I'm not sure what to do about the piston. I noticed that an 064 piston fits well with about 50 thou higher up ring lands, and about a 15 thou higher however sadly the skirt is too narrow. If it wasn't for the skirts I could run a nasty compression set up with only a small pop up, and without messing with the timing too much. The stock 064 piston skirt is wide enough to close the exhaust port, however I wouldn't be able to widen it any which bothers me. I could lower it considerably without free porting due to the longer skirt, however I appreciate this wouldn't help as much as a wider port.
My question is this, do I run an 038 mag aftermarket piston, or an 064 meteor (I don't know if they make meteors for the mag) ? Do I go for a compression setup with stock width low exhaust and a narrow than I'd like intake with wider & lower transfers, or do I go for wide exhaust, wide intake, but more machining to get the squish I want? The 064 higher ring lands would let me remove that tongue from the middle of the intake, as the rings wouldn't come down into the port.
Or as a curveball do I get an 046 meteor and see how that looks in comparison? Thoughts?
Scoring
038 mag mahle
064 KS piston
I've got a company that can re plate cylinders at a good price as a friend who owns a trials bike shop uses them a lot, so I get mates rates.
However I'm not sure what to do about the piston. I noticed that an 064 piston fits well with about 50 thou higher up ring lands, and about a 15 thou higher however sadly the skirt is too narrow. If it wasn't for the skirts I could run a nasty compression set up with only a small pop up, and without messing with the timing too much. The stock 064 piston skirt is wide enough to close the exhaust port, however I wouldn't be able to widen it any which bothers me. I could lower it considerably without free porting due to the longer skirt, however I appreciate this wouldn't help as much as a wider port.
My question is this, do I run an 038 mag aftermarket piston, or an 064 meteor (I don't know if they make meteors for the mag) ? Do I go for a compression setup with stock width low exhaust and a narrow than I'd like intake with wider & lower transfers, or do I go for wide exhaust, wide intake, but more machining to get the squish I want? The 064 higher ring lands would let me remove that tongue from the middle of the intake, as the rings wouldn't come down into the port.
Or as a curveball do I get an 046 meteor and see how that looks in comparison? Thoughts?
Scoring
038 mag mahle 064 KS piston
. In this chainsaw forum there is a Tech section...in that you will find a threads on cleaning up "aluminium transfer " the "Mastermind" way. ..have a look and like me you will never bother with acid again. Worth a look and a try ??
