Author Topic: Who makes good cylinder, piston rings, for 372 and 390xp's?  (Read 793 times)

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Offline mdavlee .

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If you used a good bit of assembly lube on the rings it could be reading a bit high. Run it as is and then check it after it cools down again.

Offline KilliansRedLeo

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Tim and 660,  question for you both.  Are either of you using a base gasket or copper shim?   And what is the squish on your saws? 

Also, I did not try to start it yesterday, wanted the gasket in a tube to set up before fuel gets at it.
Al, I am running no gasket, (Yamabond4) and been a while since I built that saw but my notes say that the target was .020 and I settled on .023 and 198PSI. I am going to build up another one for a customer after the holidays, I let you know the numbers on that saw also.
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Offline 660magnum

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I didn't put my saw together and have no clue but always assumed it didn't.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline alsled

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I did put a lot of oil in the jug befor pulling it over.  I also had no bar on it.  put bar on it and with the oil drained out I can pull it no issue.

Next new problem, can't keep it running, I turn the low speed adjustment screw 5 turns out and it does nothing, its running lean, now to take the carb apart.  This bugger is slowly testing my patience.

Offline Cut4fun

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I didn't put my saw together and have no clue but always assumed it didn't.

If your talking about the 52mm big bore with 064 piston. Snoopy put that saw together. I think he used Threebond 1194, but you would need to look. I know it's sealer, just not sure what he used.  (or maybe my mind dont remember and is wrong)  :-[ :D
I measured it but dont remember. The squish on that one could still be tightened a little (take off the base). But seen no reason to on a work saw.
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Offline 660magnum

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In a lot of the after market cylinders, The nipple for the impulse line is loose in the bottom of the cylinder and you may have a air leak in that area? Sounds like a air leak or you have pushed sealer material up over the end of the impulse line inside your cylinder and the pump in your carb is not working well?
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline alsled

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Pulled the hi and low speed screws out, shot some carb cleaner through it all is good!

I have the BB and the 51 with a new piston and ring idling outside  right now.

When the BB cools down I'll check compression.

Offline alsled

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660, I blew air through the impulse line after assembly to clear out the passage just in case.  the carb had some crap in it read my post above

Offline KilliansRedLeo

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OK, the BB had to have run out of fuel by now. So, what is the latest?
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline alsled

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All seems good Tim, got the bugs worked out, need to put it at some wood.  Didn't check the comp after it cooled down, I got into some other things.   

 

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