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RI Chevy

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Is there ever deviations between same saws with cranks? I guess what I am asking is there differences in crank stroke with same saws?
 

bikemike

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Here's Don's poulan pro 505 making the first cuts after port work. Running the same bar and chain with 9 pin as the video before. rakers set at .070 depth
After all other mods but before any port work:

After port work:

I'd say this thing has a good bit left in it if it were to be a race saw.
Pipe it poulan+ pipe× sound waves= stihl killer husky slayer. I think. my calculator broke
 

X 66 stang347 X

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I actually reread that question and confused it for production cylinders you had part of making or something like that. didn't mean to interrupt you. lol

I recently saw that on HLS and think they use his #'s and port design but casing has its variances so the porting would have to be milder but I could be wrong. When I rebuild a saw I would like to use a good used ported cylinder or a good production cylinder that has better #'s and squish than stock.
 

Chainsaw Jim

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I recently saw that on HLS and think they use his #'s and port design but casing has its variances so the porting would have to be milder but I could be wrong. When I rebuild a saw I would like to use a good used ported cylinder or a good production cylinder that has better #'s and squish than stock.
There are a handful of models with no base differences. Those are probably the only ones we'll ever see pre modded cylinders for.
 

mdavlee

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Is there ever deviations between same saws with cranks? I guess what I am asking is there differences in crank stroke with same saws?
Usually very little. If I do just a cylinder I run a little looser squish than if I have the whole saw just in case it's a tiny bit tighter on their saw.
 

RI Chevy

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Usually very little. If I do just a cylinder I run a little looser squish than if I have the whole saw just in case it's a tiny bit tighter on their saw.
Cool. Thanks Mike.
 

Canadian farm boy

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jmssaws

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Re: pre ported cylinders ... I think what scares some of the builders are differences with the various pistons, both in skirt width and the resulting squish.
I don't do just cylinders.
There's to many things other than the cylinder to make one run like it can
I want to mod the muffler and advance the ignition and run it and tune it at least once just so I know how it runs.
 

MustangMike

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I don't do just cylinders.
There's to many things other than the cylinder to make one run like it can
I want to mod the muffler and advance the ignition and run it and tune it at least once just so I know how it runs.

And you left out "assembled correctly"!!! Plus, you running it and testing it out is an invaluable quality control.
 

X 66 stang347 X

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It was just a thought. That's what I would worry about to. Was it installed right, any air leaks, and tune. But the porting and piston would be a matched set and not a crazy port job just a moderate and reliable one. With even a muffler mod combo maybe. I think if tried it could really take off.
 

MustangMike

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mdavlee

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It was just a thought. That's what I would worry about to. Was it installed right, any air leaks, and tune. But the porting and piston would be a matched set and not a crazy port job just a moderate and reliable one. With even a muffler mod combo maybe. I think if tried it could really take off.
I've done probably 8-10 this year like that. They all went to people active on the forums that do their own repairs and most get a base gasket instead of sealant.
 
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