HELP! Stihlms660

[Stihlms660magnum]

Need to know if you can run a 661 cylinder and piston on a 660mag or carb?

 

[huskihl]

The only thing that swaps between those 2 is a couple of the screws. Maybe some clutch parts

 

[Stihlms660magnum]

The only thing that swaps between those 2 is a couple of the screws. Maybe some clutch parts

Oh, okay. I just did some work to my 66 I went from a wj69 to a wj10a which has a bigger jet. And I bored out the barrel of the carb, runs way stronger and better so I’m gonna leave it for now until I get it ported

 

[Stihlms660magnum]

I think you can run a 395 piston in it I would have to bore the cylinder not completely sure.

 

[drf256]

I think you can run a 395 piston in it I would have to bore the cylinder not completely sure.

On an MS660? 56 vs 54mm. Piston will not fit.

 

[Stihlms660magnum]

On an MS660? 56 vs 54mm. Piston will not fit.

I know that on the stalk cylinder. It would fit if it’s bored and replated I’m just not sure about the connecting rod length on if the piston will hit the top.

 

[Maintenance Chief]

I know that on the stalk cylinder. It would fit if it’s bored and replated I’m just not sure about the connecting rod length on if the piston will hit the top.

Please let everyone know who will replate
The cylinder for you, that part could be extremely difficult and $$$

 

[Stihlms660magnum]

Please let everyone know who will replate
The cylinder for you, that part could be extremely difficult and $$$

I know. Where I’m at it’s 180$ to have it replated

 

[Maintenance Chief]

I know. Where I’m at it’s 180$ to have it replated

180$ aint bad if you've got a rare Remington cylinder or an heirloom saw.
Who does them for you?

 

[Stihlms660magnum]

180$ aint bad if you've got a rare Remington cylinder or an heirloom saw.
Who does them for you?

US chrome

 

[drf256]

395 piston will fit a big bore 56mm am 660 jug. I did it. Takes some piston machine work and I think a spacer. I’d have to check my notes.

 

[drf256]

Twisted Up 56 Mirrometer 660 Jug Build.

We need more build threads here, period. This may be an epic fail, but the work is worth it to further our knowledge/passion for these pieces of lawn equipment we hold so dear. It’s for my pal @MustangMike , so it’s worth the effort and likely embarrassment. So here it goes...

opeforum.com

 

[drf256]

Fwiw, ran pretty good. But a 54mm OEM jug with an oem piston whooped its ass. No fingers or nothin. @mdavlee recipe.

Saw is still running well. You cannot beat oem transfer tunnels. Sow’s ear vs silk purse kinda stuff. In the end, I timed the ex near 100 and shulda been on the 95 range.

Remember that once you bore a jug out, you reduce transfer tunnel area. Part of why big bores run shítty. At $180, you are at a bargain though.

 

[Stihlms660magnum]

Fwiw, ran pretty good. But a 54mm OEM jug with an oem piston whooped its ass. No fingers or nothin. @mdavlee recipe.

Saw is still running well. You cannot beat oem transfer tunnels. Sow’s ear vs silk purse kinda stuff. In the end, I timed the ex near 100 and shulda been on the 95 range.

Remember that once you bore a jug out, you reduce transfer tunnel area. Part of why big bores run shítty. At $180, you are at a bargain though.

Yeah, I’m not sure if I should do it. As it is rn it runs pristine and I’ve raced with it already a I beat several modded saws as mine is still stock

 

[Stihlms660magnum]

Yeah, I’m not sure if I should do it. As it is rn it runs pristine and I’ve raced with it already a I beat several modded saws as mine is still stock

file:///var/mobile/Library/SMS/Attachments/fb/11/ED9EC946-6BEA-4E13-97EB-A22D2BDA2880/IMG_1223.MOV

Here’s a vid of it running, I had it to lean at the time, after I cut some wood I fine tuned it.

 

[Ketchup]

Your vid link is garbly-gook on this end.

You might find this interesting:

066/394 hybrid build

Well it looks like I'm going to build a 066 bottom with 394xp top end. Here's the two candidates for the build.. I'm still trying to decide on which piston I should use...the 056 mag or the 394. It would be nice if there was a piston with a pin to crown height in between the two.

opeforum.com