Jonsered Set-up

This is becoming a very interesting technical discussion. I love learning about this stuff.

Here is my theory.
I think the regular 670 and 266 is the same, as Ulf said.

There perhaps was a demand for more power to this good saw, so they put another head on. This I base on the fact that the champs are not seen here, kind of strange.


Many models that was sold on export only was bigger, has more power, this could be to compensate...... You know big car small dxxx, but that is also a theory.

They are the same with exception to the carb. Same bore same stroke both closed chamber. Same kw. The champ could be the same to. I think if the port timeing was checked against the 266 we could lay it to rest. How soon can you get that done mange? Where did they get the power differance between the 266 and the 266xp? If you can find that out that might tell us why the differance between the 670 and 670 champ. What carb was used on the 266 and 266 xp? What carb was used on the 670 and the 670 champ? Dig mange dig.

the champ used an HS 230 carb, while the 266XP used an HS 224C the regular 670 used the same HS230 series carb as the super and champ.

Posable hp gain oldsaw? May be.

Mange look at the air filter cover on the 670. The filter is barely under it. With the filter that high would it fit under the cover of a 266? Remember what I said about the carb and jug being different? Dig mange dig.

The 266 is closed for sure.the Champ use a single "coil" instead of a 2 parts system seen on 630,670,266.The champ had a different flywheel.the key was "cast" in the flywheel itself.the 670 use a rubber intake,not like the other models with a plastic block between cyl and carb.

Its been sometime since I have had my carb off but Im thinking there is a clamp not bolts. Probly the reason the 266 carb wont work on the 670 jug.

Mange said:

Here is my theory.
I think the regular 670 and 266 is the same, as Ulf said......

Click to expand...

MY theory is quite simple;
I think that he meant the 266xp engine and the plain 670 engine is basically the same (only .1 kw difference in power).
I also think the the Super/Champ engines were basically the same as the 268xp engine - only .1 kw power difference there too (both ways on different times and/or markets it seems).

I also think that it is possible that there were differences in both porting and carbs, even within the same model designations....

Still

Sawtroll Jonsered advertized that the rubber spacer used between the carb and jug kept the fuel mixture cooler and helped on restarts. That trick has been used for years and still is in the auto industry. I know we are not talking about an auto but the princple is the same and it works. The draw back was if you got your saw stuck and a lot of guys did, they would pull on the handle until they tore the rubber spacer. That along with the different carburator used more then likely accounted for any hp differance if there was. A spacer it self changes the charctiristcs of an incomeing charge, again used in the auto industry. Weather it helped make a change in the hp is debateble. My thoughts are the jugs are the same with some small differances.

Some are quoting me as expert...please don't, as I'm not. I do have a 670 and 625, with the 670 sporting a 272xp jug and piston, carb, etc. I have some old Tilton parts lists and IPL for Jonsered and have had access to similar Husky pages...both list a bunch of part numbers for what are similar saws...266/268xp and 670. Some part numbers match between marques, some do not.

The early 625 and 670 models had the 2-piece coils but the later ones are the same as Husky. I don't know the whole story about the champ and super designation, but I think the super came about as a result of slow sales on the west coast when the 272 became available. Bee Tee sold the super for a couple of years before Tilton had them. The champ WAS the 670 towards the last...I think they were just capitalizing on the good reputation the saws earned. I don't know if the cylinders on the super were a little better or not..a tenth or two extra HP is pretty elusive out in the woods! I cant feel the diff. between the "new" 272/670 and the old!

Some of the west coast supers also had the high-capacity filter...both 630 and 670. It required a nylon elbow to turn the spigot upwards, and a hole routed in the cover. This filter was rare in the east and midwest, as it was problematic in the snow...I've only seen it on fire-dept saws here.

I *think* that elux spec'd out cylinders to at least two outsource companies...Mahle and Gilardoni, and this is where some of the odd part numbers come from. I have seen cylinders without a makers name as well, so maybe there were even more...

I have a 630 promised me, and have a junk 268 (non-xp) as well as brand new 268 non-xp) piston and cylinder. I think the crank bearings are bad in the 630, but the seals went bad in the 268, causing a burn-down. I'm hoping to have another bastid elux (red) saw.

eyolf I would be interested in what the championships were that they won with the 670 champ and what other saws they were competeing with. I dont know about the super but with out a dought the champ gained its name from that and as you say probly slow sales. Can you use the 670 carb with 272xp jug or do you have to switch carbs also to run the 272xp jug and piston on the 670? Does the 272xp use the ruber spacer between the carb and jug? I like the idea of a 272xp-champ.

you can run a 272 jug on the champ,better with the 272 carb because choke ,throttle shaft are different ,also the idle screw location.The 272 DONT have the rubber spacer.
You could use the champ carb on the 272 jug IF you change throttle and choke shaft only.

I do not bye that.

I will try to post a pick of the 670 champ jug. Does the 266 or 266xp have the port on the jug for the pulse tube like this?

Eyewolf's post reminded me--My running 670 is a West Coast (I had earlier posted that I didn't know which 670 it was) and it arrived without an air filter cover, & with a K & N filter, the nylon elbow, and the clamp to hold the filter on to the elbow. It also has the full wrap handle, which I believe is original Jred. According to Mike Acre's site the West Coast is one of the higher HP 670s.

I apologize as I realize that this doesn't help determine when Jonsered made what changes to the 670.

Dont worry Chris we hijacked this thread way befor you got here. I think the changes took place from the get go on the 670s. The 266 huskys are the same cc but Im pretty sure the jugs that rolled down the jonsered line had some differances. I will find a pic of the 266 and 266xp to post. Im not to sure but i dont think either had the port on the jug for the pulse tube to the carb like our 670s have. I could only guess what els could be different. Its hard to say weather the hp numbers were inflated or if they were real. I would not be surprized either way.