What's on your bench?

[eric4]

It probably won't burn out, but after 20 years corrosion will eat it

20 years should buy me some time to make another one...

I'll run it

 

[Woodwackr]

I'm converting a Shindaiwa 577 into a 680, and doing a big muffler guttin'

What's the verdict on using galvanized sheet metal for this small muffler baffle? I figured the toxic crap would burn off relatively quickly, but I'm open to opinions...

View attachment 447045

Big hole, lol. The later 1-pc mufflers are heavy suckers. The early 3-pc are easier to work with, imo. I see no reason that deflector won’t work fine. It won’t handle much abuse but so what? Just replace it.
I may cut My 1-pc apart, gut and re weld.

 

[eric4]

Big hole, lol. The later 1-pc mufflers are heavy suckers. The early 3-pc are easier to work with, imo. I see no reason that deflector won’t work fine. It won’t handle much abuse but so what? Just replace it.
I may cut My 1-pc apart, gut and re weld.

I'm not sure if mine is a 1pc or 3, but it didn't feel like a total tank of a muffler... Seemed pretty easy to muffler mod to me! Excited to see that a 680 topend will do... Hopefully run a 24" with authority

The original muffler port had tight louvers, and a front wall, that the exhaust would push into. Akin to screaming into the mirror from 4in away.

 

[Woodwackr]

I'm not sure if mine is a 1pc or 3, but it didn't feel like a total tank of a muffler... Seemed pretty easy to muffler mod to me! Excited to see that a 680 topend will do... Hopefully run a 24" with authority

The original muffler port had tight louvers, and a front wall, that the exhaust would push into. Akin to screaming into the mirror from 4in away.

The 3-pc is basically an early 80s husky 61 or 266se design. Two halves of a can with a baffle plate in between. You pictured the braised 1-pc. Only way to gut those is cut them apart and weld back together.
Yea, those deflectors are nuts . 288s had that style

Top end for the 680 and 695 are the same so you could call it a 577/695

 

[eric4]

The 3-pc is basically an early 80s husky 61 or 266se design. Two halves of a can with a baffle plate in between. You pictured the braised 1-pc. Only way to gut those is cut them apart and weld back together.
Yea, those deflectors are nuts . 288s had that style

Top end for the 680 and 695 are the same so you could call it a 577/695

It's a pretty solid jump in cc's! Although I just did a Makita 6421>7901, so that might have the HP increase victory.

Wondering what the squish will work out to on the 695 conversion. Since OEM pistons are unavailable, I picked up a LRB piston. Understanding their reputation isn't great, it's the only option.

 

[Woodwackr]

It's a pretty solid jump in cc's! Although I just did a Makita 6421>7901, so that might have the HP increase victory.

Wondering what the squish will work out to on the 695 conversion. Since OEM pistons are unavailable, I picked up a LRB piston. Understanding their reputation isn't great, it's the only option.

Shouldn’t change…still way too much. Spec at over .100
Did you try their popup?
Oops, only pop ups are 45 and 51mm

 

[Woodwackr]

Shouldn’t change…still way too much. Spec at over .100
Did you try their popup?

I kept trying fatter solder thinking something was wrong. Then, looked it up

 

[eric4]

I kept trying fatter solder thinking something was wrong. Then, looked it up

Wow, that's the anthesis of 'squish'... if that's the case, I might send it off to an OPE member that can cut down the base.

 

[Woodwackr]

Wow, that's the anthesis of 'squish'... if that's the case, I might send it off to an OPE member that can cut down the base.

Exactly what I may do with a couple

Do you have the shop manuals?

 

[eric4]

Exactly what I may do with a couple

Do you have the shop manuals?

Nope! I try to find .pdf's on the web for various saws. Shindaiwa's aren't the most commonly discussed...

 

[Woodwackr]

Ipl

 

[Woodwackr]

Sm

 

[Woodwackr]

Dealer pts list, ‘89

 

[eric4]

Wow, love the illustrations on these older service manuals.