Stihl MS695XP SUPER Build Thread

[Nutball]

It is exactly what it sounds like. If nobody's built one yet, I'm going to give it a shot. I've been meaning to for a while actually.

Any tips would be helpful. I'm gonna go get things ready.

 

[Nutball]

Well, a real Husqvarna and Stihl probably wouldn't get along, so I'll just use parts out of the junk pile.




It can't be a Super unless it's a big bore. 105.6cc


It could be a Magnum too if only I had a sticker.

 

[Nutball]

54mm 660 piston




Uh oh.

 

[Funky sawman]

This is going to get interesting

 

[Nutball]

This was a dumb idea.

 

[Nutball]

It looks doable right?



Maybe?




Ok, will need some ideas on the intake IF I can get the cylinder to fit. Maybe some custom boot material? Maybe I could add some epoxy and reshape the 395 intake into a 660 intake?

And the spark plug holes seem close enough to work with.

 

[Red97]

Chainsaw Jim built one a few years back. Started with a 394 jug.

Seemed to be a decent runner.

 

[P.M.P.]

Chainsaw Jim built one a few years back. Started with a 394 jug.

Seemed to be a decent runner.

Just thinking the same thing chainsaw Jim did some crazy chit like this. I used to enjoy them frankenstein threads of his.

 

[Nutball]

Looks like Jim used a spacer to raise the cylinder. I don't think I have the tools to make one, so I'll have to keep the cylinder low. I'll get back on this Monday.

 

[Red97]

Looks like Jim used a spacer to raise the cylinder. I don't think I have the tools to make one, so I'll have to keep the cylinder low. I'll get back on this Monday.

661 piston

 

[Nutball]

661 piston

58mm?

 

[Red97]

58mm?

Missed that part

56mm

 

[Wonkydonkey]

Cool, I like it,, it looks to be a good challenge.

subbed

 

[Nutball]

I'll have to cut 2.5mm off the bottom of the piston to reach BDC. Any guesses on weight savings? I'll guess 6g.


Nope, just 1g, and I had to cut a bit more than 2.5mm off.

 

[Nutball]

 

[ManiacalMark]

What's your gap with to the case surface? .190"?

 

[Red97]

I'll have to cut 2.5mm off the bottom of the piston to reach BDC. Any guesses on weight savings? I'll guess 6g.


Nope, just 1g, and I had to cut a bit more than 2.5mm off.

Make sure it dosent free port.

 

[Nutball]

What's your gap with to the case surface? .190"?

Looks about .210"

 

[Nutball]

Make sure it dosent free port.

It has another .125" before freeport, so with the .210" extension off the cylinder we're looking at about .085" of freeporting Dare I JB weld the exhaust floor? I think the top of the piston will be a good bit above the floor, so maybe it can take the heat?

 

[Red97]

It has another .125" before freeport, so with the .210" extension off the cylinder we're looking at about .085" of freeporting Dare I JB weld the exhaust floor? I think the top of the piston will be a good bit above the floor, so maybe it can take the heat?

Piston going to hit the crank? You can open the case if needed.