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Worn rings

old guy

Love me some Husqvarna
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Picked up an 05 372 last week,starts & runs great but seemed a little lackluster.
Put the tach on it, 12800,we can do better than that,got it to 13200, won't go higher, threw a different carb on, same thing, OK, what color is the coil? Sure nuff, it's blue 13300, my first limited coil.
Next I checked compression 130, kinda low.
Today I pulled the top off to see if it had 1.2 or 1.5 millimeter thick rings,I've been bit by this before, they were 1.2, the ring gap was .020 just above the intake port, time for new rings.
Piston has wear, but is good, cyl. is perfectly good. The rings have slight Mark's on the edges that I can catch a nail on, there are no corresponding Mark's in the cyl.20181006_095312.jpg 20181006_095233.jpg
Well, I gotta go order some rings, here's pics of the top ring, I've not seen those letters on a ring before, but then I have't seen that many rings.20181006_095312.jpg
 

huskyboy

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Seen that marking on a few rings before. Especially the mahle topends. I think “maw” might possibly be a german manufacturer of some sort or initials regarding mahle?
 

Al Smith

Here For The Long Haul!
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If it's stock porting you may not get it any higher new rings or not .
 

old guy

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If it's stock porting you may not get it any higher new rings or not .
Oh, I know that, but a new top ring will get the comp up to near 150, then I'll have to learn more about tuning in the cut.
I wanna keep this one stock for a while so I have something to compare my other one to which I'm working on.
 
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