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Czed

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I built this 1999 371xp over 4 year's ago the original boot tore and fried the topend.
He wanted a big bore so this is a 21.00 ebay special.
The 371 topend i cleaned it up and is on my china saw #3 runs great.
After heavy use it was his only saw for year's he has a 290 now too the big bore has lost some comp piston20171106_135842.jpg 20171106_135904.jpg 20171108_142754.jpg 20171108_170656.jpg 20171108_164355.jpg
Still looks great though a bit dry he runs 50/1 stihl ultra.
The wash doesn't look good though but it was always a good running saw.
I'm going to refresh it might throw another topend to try out on it I've got a few different china cylinders and put a new muffler after i mod it.
 

Poleman

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Looks good for time and money spent! I'd rering it and go......But I see you are looking at enie meany time with that box full of full of cylinders.

Gonna try your foaming bubble trick too!!!! ;)
 

Czed

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Looks good for time and money spent! I'd rering it and go......But I see you are looking at enie meany time with that box full of full of cylinders.

Gonna try your foaming bubble trick too!!!! ;)
I get a lot of logger's beat to death saw's lol
The foam loosens it then pressure wash does the trick.
Some guy's worry about the precious sticker's though lol
 

Mattyo

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I already did the vid series lol.

The squish was excessive. ... 70 thou. Or so
 

Czed

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That piston doesn't look that worn, rings worn out?
Yes cabers i put in 4 year's ago piston still looks new.
It has a lot of hours on it.
 

Terry Syd

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The wash doesn't look good though but it was always a good running saw.

Here's a trick to try and get the flow equal from each side, shine a light up through the transfers while look through the sparkplug hole and get the transfers to crack open at the same time. You may have to rough up the transfers to get them to reflect enough light, but when you get the light cracking through at the same time on each side, you've got them equal.

For guys that don't have any porting tools, you can nip the top of the piston with a file to get the transfers opening at the same time.
 

Mattyo

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when the cylinder is off the saw, put an old ring in the bore. press the ring down with the piston.... the piston presses evenly on all sides...so the ring will go evenly down to where you want it. put it just beyond the transfers and see if they are even or not.

same thing Terry just said, just a different technique
 

Ktoom

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A co-worker bought a Hutzl 372 kit last month. I guess It ran good for the first tank full and not so good after that. Hes since put on an oem coil and oem carb. Everytime he goes to hit the throttle, it dies out. I tried to walk him through some diagnosis to no avail. He supposed to bring me the saw and i will do a vac/pressure test for him . If i find anything odd, i will share it.
 
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