A Solo 667 Build thread

[Marshy]

Ok fellas, I'm starting this build thread because I'll probably need some input from the group along the way. I haven't done much of this before and I'm diving into the deep end with this one.

The saw is a Solo 667. These have a 38mm stroke and a 42mm bore. It has a windowed piston with a 12mm wrist pin. The cylinder has case fed transfers and the case has some wild flares over the bearing pockets to feed the transfers. That will cause some issues later on.

The plan is to fit a 56mm cylinder on this. I have the following parts on order, 395 cylinder kit, a 066 big bore cylinder kit and a Hyway 066 big bore popup piston.

The 395xp is 56mm x 38mm stroke and because it has the same stroke as the 667 I want to try and use the cylinder. The 066 big bore kit is also a 56mm cylinder but they have a 40mm stroke. I bought the popup piston to use with the 395 cylinder.

I wasn't sure the 066 cylinder could withstand taking 2mm off the base without causing port timing issues. The reason I bought it was because I know the cylinder bolt spacing is really close to the Dolmar 7900 which is also very close to the 667 bolt spacing. I dont know how similar the 395 bolt spacing is until I get it in hand.

Here is the case with the flares to feed the transfers.


Here is a Dolmar 7900 big bore cylinder set on the 667 case. See the gap?


It might be a few days or more before I get the cylinders I ordered. Can anyone measure and tell me the width of a 395 and/or 066 cylinder base?

In the end I may have to get the case halves welded and then I will mill them to fit...

 

[andyshine77]

Interesting build! [emoji106]

I don't have much info to help you out with, or cylinders in hand to measure. I do know the 395 and 660 have side feed transfers, and the side of the cylinders are more straight across like the 7900 cylinder. I know mag cases can be welded, but it's very difficult, blow through and warping is a problem. Machining things back would take a skill as well, as I'm sure you already know.

Don't know how much help this is, best of luck with the build! I'll be fallowing along.[emoji111]

 

[TreeLife]

Cool project! Sub'd!

 

[AlfA01]

If you go the 395 route, you'll want to have a chat with Shaun Carr. @srcarr52

 

[srcarr52]

Hopefully there is enough room to make an adapter plate or at least a sandwiched plate to cover over the old transfer feeders. Then you can fill the rest of them with epoxy and not have to deal with welding and machining the case.

394/5 bolt pattern:
1/4-20 threads
0.265" holes through the cylinder flange
2.2" center to center wide equally spaced from the center of the bore
2.125" center to center for/aft, biased 0.036" towards the intake, center of bore to exhaust side bolt hole is longer (1.0985") than the intake side (1.0265")

 

[andyshine77]

Hopefully there is enough room to make an adapter plate or at least a sandwiched plate to cover over the old transfer feeders. Then you can fill the rest of them with epoxy and not have to deal with welding and machining the case.

394/5 bolt pattern:
1/4-20 threads
0.265" holes through the cylinder flange
2.2" center to center wide equally spaced from the center of the bore
2.125" center to center for/aft, biased 0.036" towards the intake, center of bore to exhaust side bolt hole is longer (1.0985") than the intake side (1.0265")

Your work and knowledge is always off the chart!

I was thinking of some type off adaptor plate as well, I just have no idea how to do that though, above my pay grade lol.[emoji111]

 

[Lightning Performance]

Find out the difference between the 395 conrod ctc and yours. Check your case height and then you'll have an idea where the exhaust will land. You can adjust the piston skirt and/or the intake floor later. Like Shaun said, a plate would make it easy.

The problem might be vibration with that high piston weight. A light as possible piston and a welded crank pin on a diet could smooth it out.

 

[srcarr52]

Your work and knowledge is always off the chart!

I was thinking of some type off adaptor plate as well, I just have no idea how to do that though, above my pay grade lol.[emoji111]

It's because I wrote a CNC program to cut these, I had to make a lot of them.

 

[Marshy]

Hopefully there is enough room to make an adapter plate or at least a sandwiched plate to cover over the old transfer feeders. Then you can fill the rest of them with epoxy and not have to deal with welding and machining the case.

394/5 bolt pattern:
1/4-20 threads
0.265" holes through the cylinder flange
2.2" center to center wide equally spaced from the center of the bore
2.125" center to center for/aft, biased 0.036" towards the intake, center of bore to exhaust side bolt hole is longer (1.0985") than the intake side (1.0265")

Good info, thanks. Yould you happen to know the overall width of the flange? Looks quite probably a spacer will be required. It would be a lot simpler than all that welding.

 

[huskihl]

One thing to consider; just because the 667 and 395 have the same stroke doesn’t mean that they’ll have the same squish or deck height. One could have a longer/shorter rod or the crank could be mounted higher or lower in the case. You may find that the 395 cylinder would require a 1/4” thick spacer. Or the opposite

 

[huskyboy]

That gap in the case is going to be your biggest problem.

 

[Deets066]

That gap in the case is going to be your biggest problem.

Should be pretty simple, JB weld is your friend

 

[Marshy]

One thing to consider; just because the 667 and 395 have the same stroke doesn’t mean that they’ll have the same squish or deck height. One could have a longer/shorter rod or the crank could be mounted higher or lower in the case. You may find that the 395 cylinder would require a 1/4” thick spacer. Or the opposite

Exactly my thoughts. Truth will come out when I get the cylinders on hand. Just going off the 7900 BB cylinder I have in hand shows the 667 cylinder is shorter by a fair bit. Which means it might have a lot shorter rod as well. It might be a mile off and not even worth messing in the 667 case.

 

[Deets066]

Exactly my thoughts. Truth will come out when I get the cylinders on hand. Just going off the 7900 BB cylinder I have in hand shows the 667 cylinder is shorter by a fair bit. Which means it might have a lot shorter rod as well. It might be a mile off and not even worth messing in the 667 case.

661 jug could be an option with some work

 

[huskihl]

930 jred might be an option too. Not sure of the bore diameter, but I believe it has wide cutouts like that

 

[Marshy]

Well, as hard as it might be to find, I'm doing a little searching for a Solo 690 P/C (55mm) or even a Solo 603 P/C (56mm). Both like hens teeth but it might be worth the hassle. I have line of site on a NOS 690 P/C but working through how to acquire. Fingers crossed.

 

[srcarr52]

It's not as large of bore as you'd like (52mm) but a Husky 180/280/380/480 series was a bottom fed transfer port.

 

[Marshy]

It's not as large of bore as you'd like (52mm) but a Husky 180/280/380/480 series was a bottom fed transfer port.

Everything I read was a 690 is 55mm bore. I believe I read it from @jacob j. in a Solo thread on AS... in any case, the P/C I found is in fact 55mm. As is right now, its seems unlikely I will acquire it as it requires a bank transfer of funds to over seas. Not a risk I want to take... we have any reputable members in Germany on the site?

 

[Marshy]

It's not as large of bore as you'd like (52mm) but a Husky 180/280/380/480 series was a bottom fed transfer port.

Already looked into them. They have bore fed transfers just like the 2100. I actually have a spare 480 P/C and gave it a look.

 

[srcarr52]

Already looked into them. They have bore fed transfers just like the 2100. I actually have a spare 480 P/C and gave it a look.

Check again... you probably have a 285 cylinder.

https://store.chainsawr.com/products/husqvarna-480-cd-chainsaw-piston-and-cylinder-set