Author Topic: Adapting a Jonsered carb of specious origin to Husqvarna Top ends.  (Read 668 times)

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Offline weimedog

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Sort of did this because I could. Going to use these Jonsered saws to test Aftermarket stuff for the same class Husqvarna .... because many will see the Husqvarna models and assume they can't use them on these older Jonsered. SO I'm forcing the issue. Going to do ALL the comparisons of after market parts designed for Husqvarna's of the 268-272 species on Jonsereds 670 and 625 to prove you can and to hammer the point home....definition of win? To help those old Jonsered's catch a second chance in life... :)

First one.....that 268 open port top end with goofy port timing on a 670.


https://www.youtube.com/watch?v=Q5fF6oq7VxA

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Offline Cut4fun .

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I got a question on these. I seen a jonsered 670 piston that had same part number for the 266.  Same pistons or mislabeled.   I dont know these well at all to know anything.

I can get a pic and part number I seen.
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Offline weimedog

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I got a question on these. I seen a jonsered 670 piston that had same part number for the 266.  Same pistons or mislabeled.   I dont know these well at all to know anything.

I can get a pic and part number I seen.

I can believe that as both 266's and 670's are 50mm closed port cylinder's. 670's are all closed port cylinders, I believe one or all of the 266's models are closed port cylinders as well. If I remember one of the versions of 266 had a funky intake, smaller than say a 268; but still was a closed port 50mm cylinder.

I think there was se & xp version's of the 266. Pretty certain the xp was closed port. Bob would know. AND come to think of it, that video we did have a 266 closed port cylinder as one of the cylinders we looked at.

Either way.....I tossed the 266 cylinder on one I built in favor of a 272xp cylinder! One of the easier cross builds on that chassis.

Offline Cut4fun .

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Never pulled the 266 I had open before selling. But I had thought (guessing) a 266 was full circle windowed type piston and this 670 was your normal windowed piston. Thats why I was wondering.
Was there 2 pistons used in the 266 saws maybe?
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Offline SawTroll

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All the 266se and xp Huskys were closed port - but up to some time in (or around) 1985 the se shared the smaller carbs with the 61 and 162 (15.9 mm venturi vs. 17.5).

As far as I know, no important changes happened at the same time as the designation changed from se to xp.

Offline SawTroll

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Never pulled the 266 I had open before selling. But I had thought (guessing) a 266 was full circle windowed type piston and this 670 was your normal windowed piston. Thats why I was wondering.
Was there 2 pistons used in the 266 saws maybe?

At least two, and I understand the early saws had the full circle ones.

Offline weimedog

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Wonder if the 670 piston would produce a little more power.

Offline Spike60

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They're all the same piston at this point. Some 266's dd have the full circle piston. Not sure it that was ever used on early 670's, but I suspect it was.

Later 670 piston, a Super or Champ is the same piston as the 268XP. Sifting through old IPL's can cause some confusion, as there were changes over the years. But ordering any 50mm piston for these saws will all supercede up to the same number, which is the 670/268XP item.

If you prefer the full skirt style, Forester has a really nice one that I've used a couple times. I don't have a strong preference either way, but that is the one 50mm open port AM piston that I have easiest access to, so that's what I've been using.
Husqvarna-Jonsered

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