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Bigmac

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Doing a 461 out of scavenge parts!
Cleaned up a decent bottom end from all the dirt!
Took .015 of the stuffer bolts to do a bgd62C43440-7DAB-402B-876A-89CC9622DD15.jpegPut a new piston on and checked to see were everything was at.9475DCF0-08DD-4202-85A8-F27B4CA6DB4B.jpegEnded up with 105° 122° 78° and .18 squish, had to take a little it of the band. Waiting on some parts.
I think I am going to leave the ports as is, I already widened the intake and exhaust and took the lip off the bottom of the intake port, though about lifting the exhaust a couple of degrees, to 102° but I think I will leave it for better torque and not lose any compression.FDF9A8AD-84D7-4830-8B5A-2AF61708D594.jpeg
 

huskihl

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Dug this out to fix, bought it at a yard sale last year for 60$, it runs but it smokes like a chimney. Anyone know a good place for piston/rings?View attachment 209411
Replace the oil with Rotella T 15-40 and run it for 10 hours or so and see if it gets better before you tear into it. I’ve been around a dozen or so that burn oil due to the rings being carboned up. The detergents in Rotella T clean it right up after awhile
 

Bigmac

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Stevetheboatguy

mountain dew and ibuprofen please
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1124191506.jpg 1124191507.jpg


This is the first 372 I ever owned. It was put together on a shoestring budget. Has served me flawlessly but it needs some upgrading. I have 4 pistons 1- 266 non window & 3- 268 windowed(4 pistons 2 different dome sizes) that a friend cut a popup on for me. Going to try some different things one a couple different 372's and see where it lands me. Going for as little machine work as possible.

Kinda a poor mans simonized attempt. (Damn he built a strong 372)

The goal is to get a combination that will run with or outrun my walkerized 372xpg. I've been inside that saw and it doesn't have much done. But wholy moley does it run like scolded dog.

Working with some cheap farmtec and golf parts right now. Will use higher quality parts for the final product.

Steven
 
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Boots

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Replace the oil with Rotella T 15-40 and run it for 10 hours or so and see if it gets better before you tear into it. I’ve been around a dozen or so that burn oil due to the rings being carboned up. The detergents in Rotella T clean it right up after awhile
I have some redline 10-30 that has a buttload of detergent in it. Thats a great idea thnx, these things are a pita to mess with.
 

Bigmac

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Those #s should work well. I had a 460 Hemi with the same squish and Ex, Tr 127, In 75 - it ran so nice w/o any port work I left it as is and did not take it apart to do the port work I planned.

Pistons with skirt wear on the intake side S/B replaced (your first assessment was correct) as the intake may not seal properly and will degrade performance. For the money REPLACE it!!!

Good luck with your build.

Thanks for the input Mike.
I am hoping the 461 ends up with decent comp, kinda hope it’s 170+ but will see! I have another 461 that’s a solid runner to compare to.
I am planning on replacing the piston, the dirt bike, quad experience has told me that skirt wear is bad, read somewhere how skirt wear starts to ruin a bore and an extreme rate, and swapping pistons out really extends bore life. So it’s getting replaced, plus it’s a Logger’s saw, so it’s going to get worked! The saw is completely stock, thinking of adding a 288 deflector and screen and tightening the squish and check the port timing, not going to go too crazy just some basics
 

drf256

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Starting to think these 361s are your new favorite saw!!! I know you do one heck of a job on the 036/360s, would be interesting to compare them.

Any thoughts on that?

I know the 440 carb one you did looks very strong!
They are higher rpm saws. Your cutting style might make you prefer the 036’s over the 361’s. The 036 tend to have more lean on low end grunt. A ported 361 with the 044 carb and an 046 oiler is a true one saw plan.
 

dustinwilt68

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Started on this 390 that had 145 psi comp, there is some scuffing above the exhaust port and the piston is has some skirt wear, thinking it’s due for a piston, it’s only $30 more than ringsView attachment 209452View attachment 209453 View attachment 209454View attachment 209455
View attachment 209462

Brand New 390s seem to have that same spot on the piston below the exhaust port. They LL seem fine, I would measuree the thickness and compare it to the intake side, if it it's within .001 I would run it.
 

Bigmac

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Brand New 390s seem to have that same spot on the piston below the exhaust port. They LL seem fine, I would measuree the thickness and compare it to the intake side, if it it's within .001 I would run it.
Thanks! Just measured it at .010 differents! The exhaust side is thinner
 

Mkinslow

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Leaking fuel but no one can tell me where its coming from, guess I'll check it out tomorrow
1eb848bffbea3a43e34646d82951b8b4.jpg


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