Clam shell porting?

[Magic_Man]

I been wanting to try porting again since i did the husquvara 353. Whitch saw should i try my echo cs 510 or ms 250.
The echo i already did a muff mod and it seemed to help it.

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There was an old thread I read a long time ago on AS. They were talking about porting the ms250 and said that the port timing was pretty good it just needed lots more air in and out. Widen and blend everything, muffler mod, and bigger carb if you can find something that works.

 

[Czed]

There was an old thread I read a long time ago on AS. They were talking about porting the ms250 and said that the port timing was pretty good it just needed lots more air in and out. Widen and blend everything, muffler mod, and bigger carb if you can find something that works.

I remember that thread .

 

[Dub11]

If anything porting a clamshell would be just good ol cheap fun and practice.

 

[merc_man]

I started tearing the echo apart.
First snag was getting the xlutch off.

This tools not pretty but it worked.

The exhaust is 105
Intake is 73.

Now heres my stupid question. When measuering the intake it when the piston skirt clears the bottom of the intake port?
If so i measured it propper.

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[Redfin]

I started tearing the echo apart.
First snag was getting the xlutch off.

This tools not pretty but it worked.

The exhaust is 105
Intake is 73.

Now heres my stupid question. When measuering the intake it when the piston skirt clears the bottom of the intake port?
If so i measured it propper.

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Yes

 

[merc_man]

I like this clamy design better then the ms 250 i just had apart to put seals in. Its got its own bolt to hold the motor togeather. The ms 250 bolts have to go in after the motors in the saw. so you have to hold all togeather till you get it in.

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[Chainsaw Jim]

I like this clamy design better then the ms 250 i just had apart to put seals in. Its got its own bolt to hold the motor togeather. The ms 250 bolts have to go in after the motors in the saw. so you have to hold all togeather till you get it in.

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I know you're not all hung up on this, but if you bond the clam with silicone gasket maker and let it cure a bit before torquing down, it'll hold together while placing the assembly in the case.

 

[XP_Slinger]

I just picked up a Husqvarna 350 and was wondering about waking it up and the pay off being a clamshell. After talking with another member and reading this thread I'll be going at it soon. Talk about perfect timing. Thanks for asking the question MercMan!

 

[paragonbuilder]

I just picked up a Husqvarna 350 and was wondering about waking it up and the pay off being a clamshell. After talking with another member and reading this thread I'll be going at it soon. Talk about perfect timing. Thanks for asking the question MercMan!

350's are fantastic running saws! I have one with just a muff mod and 105 psi that hangs with some ported 350/346 hybrids...

 

[merc_man]

I just picked up a Husqvarna 350 and was wondering about waking it up and the pay off being a clamshell. After talking with another member and reading this thread I'll be going at it soon. Talk about perfect timing. Thanks for asking the question MercMan!

Sweet glad im not the only one gonna try these lol

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[cus_deluxe]

350's arent exactly clammys tho, with the bearing cap seperate? I have heard they can be made to run with just about anything in its class

 

[paragonbuilder]

350's arent exactly clammys tho, with the bearing cap seperate? I have heard they can be made to run with just about anything in its class

Exactly. It's more like a horizontally split crankcase

 

[Motorhead]

Is 75 too much for a 350 that needs a coil?

 

[merc_man]

Ok im havin a brain fart. Whaen i measure the port width do i take peace of card or something and hole in cylingder to get cylinder curve then trace port and measure.
Or just measure side to side. No curve factered in. I think its the side to side no curve?

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[paragonbuilder]

Is 75 too much for a 350 that needs a coil?

I'd do it.

 

[Dub11]

Ok im havin a brain fart. Whaen i measure the port width do i take peace of card or something and hole in cylingder to get cylinder curve then trace port and measure.
Or just measure side to side. No curve factered in. I think its the side to side no curve?

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good question Ive seen it done three was now. I've only done it one so far and I rolled up some paper and traced the measured from that. Was trying to use the @tree monkey way after watching his video

 

[merc_man]

good question Ive seen it done three was now. I've only done it one so far and I rolled up some paper and traced the measured from that. Was trying to use the @tree monkey way after watching his video

I curved some thin carsboard and put in cylinder and it just seemed too wide.

Then i measured markings on piston of the cylinder shape i traced and seemed propper.(to me anyhow).



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[Dub11]

I curved some thin carsboard and put in cylinder and it just seemed too wide.

Then i measured markings on piston of the cylinder shape i traced and seemed propper.(to me anyhow).
Have you watched that video? And I ended up just going for a good shape over maximum size to worried about catching a ring.


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[merc_man]

Now how do you guys get your wider port measurement into the cylinder. I see some use tape and others use thin marker.
Do you measure on a peace of thin cardboard. Cut and place in then draw lines or tape it up.

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[merc_man]

Next question. Iv never messed with intake. How do you determine how wide you can go. Or do you just leasve it and clean the port up.

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