Jonsered 630 cyl on a 266xp Husky?

[singinwoodwackr]

I picked up a 266xp from A member her a while back. It “ran” prior to teardown but not well. Comp was 200# which was odd. Base gasket was still there, so, weird…
previous owner had installed a Meteor piston assuming a 266cyl.
I discovered the oddity when I noticed the carb block/spacer was different that a 268 I also have torn down. Couldn’t match that block with anything IPL wise for 50mm Husky.
tried Jons…there it is, 630 model.
the crank #s check for a 266. I have a now 50mm piston and it does not quite match the Meteor. Not just windowed vs non…OE is taller by about 2mm and the pin position is off as well.

seems like I got a frankinsaw.
question: will this work?

next task is to try each piston and measure squish.

630
266

 

[Bob Hedgecutter]

630 Jonsered is still 48mm and basically the same top end as a 162 Husqvarna.

 

[singinwoodwackr]

630 Jonsered is still 48mm and basically the same top end as a 162 Husqvarna.

Hm, this is a 50mm cyl/piston. 670?
what I can’t figure out is the intake port. None of the IPLs show one for any husky in 50mm. The 670 shows the other intake type.
what the heck have I got here?
cyl is a Mahle, 50zn13 W2 G…
I have a 268 cyl that is a 50zn14

the intake block pt# does correspond to a 1987 model 66
picture doesn’t match but pt# does

looks like I have a 66 top end, not a 266xp

 

[Bob Hedgecutter]

No 50mm Jonsereds (670) use an intake block.
However, Husqvarna made 50mm cylinders with intake blocks and through the block impulse.
They were somewheres between the 266 and 272 variants of the family.

 

[singinwoodwackr]

No 50mm Jonsereds (670) use an intake block.
However, Husqvarna made 50mm cylinders with intake blocks and through the block impulse.
They were somewheres between the 266 and 272 variants of the family.

Right, I have a bunch of the regular blocks…266, 268, 72 and Jons 670. The one that threw me was the 503 49 24-01 which is for the ‘87 Husky 66

the 630 Jons pt# is 501 51 18-03
’87 66 is the 503#
later 66 uses a 501 80 66-02

my brain hurts.
ok, the 66-02 does correspond to some 266s as well as the 1991 66 and 268. Sheesh…too many numbers

 

[Bob Hedgecutter]

Right, I have a bunch of the regular blocks…266, 268, 72 and Jons 670. The one that threw me was the 503 49 24-01 which is for the ‘87 Husky 66

But the 670 has a rubber boot and external impulse- not a resin block internal impulse.
What are we trying to identify here- the intake block or the 50mm cylinder? Being aware there is a 268 open port and 268 closed port variant and getting the wrong piston in one will make it run like a bag of a$$holes?

 

[JohnnyBlade]

Open or closed port?

 

[ballisticdoughnut]

If it’s closed transfer 50mm bore definitely 266. Which piston came out of the saw? I assume one on the right?

 

[singinwoodwackr]

If it’s closed transfer 50mm bore definitely 266. Which piston came out of the saw? I assume one on the right?

Correct. The oe piston I have didn’t come in a box so not sure of a pt#.

 

[singinwoodwackr]

More pics

 

[singinwoodwackr]

Oe piston
Now wondering what this goes to
Mahle piston

 

[Orange Ripper]

Same intake block on my 1990 266xp and 1985 266se, also same intake shape as the 262 cylinder I have

 

[ballisticdoughnut]

There were two different intake blocks for the 50mm saws. One for SE and one for XP saws. That may be where the confusion is coming in possibly? SE saws with the HS163 carb had a different block than the XP saws with HS224 carb. Far as I can tell you’ve got the larger XP intake block which isn’t a bad thing.

 

[Orange Ripper]

 

[JohnnyBlade]

Definitely a 266 cylinder. That is probably a piston for the open port 268 or possibly the 66. This is what in looking at.

 

[singinwoodwackr]

View attachment 1136032

What year model is this? my first bought saw was an 85 266xp.
the cyl I have has a 49 24-01 block which corresponds to a 1987 266, xp or otherwise. All I have to go by is the Barrett’s IPLs

 

[singinwoodwackr]

Definitely a 266 cylinder. That is probably a piston for the open port 268 or possibly the 66. This is what in looking at.View attachment 1136033View attachment 1136034View attachment 1136035View attachment 1136036

Same cyl I have
the 268 I have is closed port and the piston looks like the meteor pictured above, windowed.

 

[JohnnyBlade]

This is the part number I have.

 

[singinwoodwackr]

So, there is an open port 268? Interesting. Well, I have a nos piston, lol

 

[ballisticdoughnut]

So, there is an open port 268? Interesting. Well, I have a nos piston, lol

I believe that’s a non x-torque 372 piston based on design and wrist pin location. Have to check part number to confirm.