Just to clear up a few things. That is an '88, it should have the two piece ignition (it has the case for the two piece). The 625II had the one piece. They were discontinued in 1997.
Jonsered 672 conversion. Could use some help
- Thread starter huskihl
- Start date
Help Support Arborist Forum:
- Joined
- Feb 17, 2009
- Messages
- 16,767
- Reaction score
- 16,090
- Location
- Beautiful Rockbound Coast of Maine
I guess we all get a little bit smarter every day. Yesterday was my first time drilling an impulse passage into a carburetor. I looked at it today and just shook my head. I also had to drill the top cover (shown above) on a hard angle to connect this passage to the pump cavity. Just goes to show us all how many different carbs they used on these models probably even in the same year models. I only say that because of reading a couple hundred threads on this subject never revealed drilling the cover also.
Anywhooo. Got it back together, pulled it 5 times and it fired up running really rich. That made me smile. Got it back to about 1.5 turns out (about a quarter turn rich until I get a couple tanks through it). Runs like a million bucks. Can't wait to make some chips.
Violá. The Husqered 672.
View attachment 390199
I suspect the reason drilling that hole in the top cover was not mentioned is that everyone else simply swapped tops with any other HS carb with the internal impulse as the hole is already in those.
Glad you got it figured out and got it running good.....should be a smart runner!!
- Joined
- Feb 17, 2009
- Messages
- 16,767
- Reaction score
- 16,090
- Location
- Beautiful Rockbound Coast of Maine
Good vid!! But I was hoping that you would have gone a little deeper into how you "Blended" the Husky and Jonsered carbs dealing with the different choke operation and choke controls issue......very important info for anyone trying this......I think I know what you did but would like to hear it from you.....
I started with a Jonsered carb that already had the "latch" for throttle/choke set up. 
Then all I really had to do was get it to pulse is the simple answer... That entailed poking a hole for the manifold actuated pulse and putting a Husqvarna carb top plate or cover that didn't have the pulse hole for the external pulse tube. I'll look at my vid again....lol that was a long time ago in dog years!
Then all I really had to do was get it to pulse is the simple answer... That entailed poking a hole for the manifold actuated pulse and putting a Husqvarna carb top plate or cover that didn't have the pulse hole for the external pulse tube. I'll look at my vid again....lol that was a long time ago in dog years!
- Joined
- Feb 17, 2009
- Messages
- 16,767
- Reaction score
- 16,090
- Location
- Beautiful Rockbound Coast of Maine
True Eric.......it would have to be the two piece ign.....that case 88 half won't accept the round one piece ign........all the IIs were one piece which occurred at the time of the case change...that's part of what made them IIs.....
- Joined
- Feb 17, 2009
- Messages
- 16,767
- Reaction score
- 16,090
- Location
- Beautiful Rockbound Coast of Maine
I started with a Jonsered carb that already had the "latch" for throttle/choke set up.
LOL!! quick response!! I see...you started with a Jonsered carb....I thought you adapted a 272 (260) carb body to the Jonsered choke/high idle platform......that's another can of worms altogether but can be done......I haven't actually done it but may soon.....I believe there should be some performance gains with the 260 .....it has a brass emulsion tube extending up into the venturi to get the fuel steam more up into the center of the air flow as opposed to simply an orifice in the venturi wall like the other HS series carbs high speed circuit....
My 61/268XP in my sig has a 254 carb ( I think) late model recirculating carb from a 670 Champ so the choke/high idle is there and working but also has the Husky thumb latch high idle......on that one I picked up the pulse from tapping into the manifold.....
Makes sense. Little bit easier with boxes of husky and Jonny parts lying around. The only other thing "husky" in my garage is a 20 year old partner concrete saw that I don't use any more...hmmm.
..
....Actually as AS members were figuring out this swap and others like it, there was obviously confusion between these 2 cases and with the husky spark plug being more vertical and tops not being tall enough. Someone chimed in with a newer 625 and said their's fit perfectly. So I ASSumed....
. Yeah . I know...But in my defense, as a noob, there are literally thousands of threads and millions of posts on here. Sorting through what has been proven and what is hearsay, and who is guessing vs who knows, can be a little tricky. But I had a blast taking a family heirloom and crossing it up with something a little different. Thanks
This thing is a runner. Considerably more power than stock. And I thought it cut like a raped ape before. Do you guys think it will be OK with a 24" 3/8 b/c? Full comp or full skip? I rarely cut anything greater than 20" in dia.
Makes sense. Little bit easier with boxes of husky and Jonny parts lying around. The only other thing "husky" in my garage is a 20 year old partner concrete saw that I don't use any more...hmmm.
..
Actually as AS members were figuring out this swap and others like it, there was obviously confusion between these 2 cases and with the husky spark plug being more vertical and tops not being tall enough. Someone chimed in with a newer 625 and said their's fit perfectly. So I ASSumed....
I may be able to get my hands on a 272xp carb. I'm gonna have a looksy at it and see about swapping 237a butterflies and shafts into the 272xp carb. Might get another 2-5% outta the ol' girl lol
- Joined
- Feb 17, 2009
- Messages
- 16,767
- Reaction score
- 16,090
- Location
- Beautiful Rockbound Coast of Maine
Makes sense. Little bit easier with boxes of husky and Jonny parts lying around. The only other thing "husky" in my garage is a 20 year old partner concrete saw that I don't use any more...hmmm.
..
Actually as AS members were figuring out this swap and others like it, there was obviously confusion between these 2 cases and with the husky spark plug being more vertical and tops not being tall enough. Someone chimed in with a newer 625 and said their's fit perfectly. So I ASSumed....
Perhaps the reason your top fit has more to do with the no name cyl. not being exactly like the OEM Mahle.
Here's a pic of the plug angle differences between the Husky and Jonsered. Far right is a 52MM Mahle 272XP cly.......middle is a 48MM Mahle 630 Jonsered cyl, the 625 and 670 look identical and all three will fit under the cover.......far right is 50MM Mahle 268XP cyl.
Next pic is the problem with the Husky cyl on a 630 saw.....even using the shortest plug I could find the air filter cover would not bolt down properly......
My cylinder isn't mahle. It's the one with an s over a k. Regardless.
I may be crazy, but my lower cover looks to be taller. As well as my airbox cover. I need to measure them both and get back to you.
I think both my original and AM cyls look like the middle one
- Joined
- Feb 17, 2009
- Messages
- 16,767
- Reaction score
- 16,090
- Location
- Beautiful Rockbound Coast of Maine
Yes the open port KolbenSchmitt cyls were used on the 625....
- Joined
- Feb 17, 2009
- Messages
- 16,767
- Reaction score
- 16,090
- Location
- Beautiful Rockbound Coast of Maine
That would stand to reason as that is a 48 MM Mahle 630 cyl and would bolt to your saw and the covers would fit perfectly......so if you AM cyl looks like that it would be why the covers fit OK.
I'm gonna look tomorrow. I'll get more pics. And I'll count the fins. The Jonny jug is missing the one where the spark is because of the angle
SawTroll
Information Collector
Kolbenschmidt (KS).
- Joined
- Feb 17, 2009
- Messages
- 16,767
- Reaction score
- 16,090
- Location
- Beautiful Rockbound Coast of Maine
SawTroll
Information Collector
Not sure. The plug angle of mine (I thought ) actually resembles your husky jugs a bit more. Maybe it's the thickness of your plug cap??? I've owned the saw for 12 years. My dad bought it new and I'm 95% certain my plug wire and boot is original. Not saying yours isn't. But maybe the 630 had a thicker boot. Sorry for the duplicate pics.
Will this thing pull a 24" bar with 3/8 full comp full chisel?
- Joined
- Feb 17, 2009
- Messages
- 16,767
- Reaction score
- 16,090
- Location
- Beautiful Rockbound Coast of Maine
Ah HA!!! I've figured this cover thing out!!!! I'm glad you did this thread......I've learned a few things on this one that I did not know.
I've got a few pics to help explain how you have been able to do this swap without any cover issues that others.... including myself, have had.
First he engine covers are basically the same on the 625, 630, 670 on the two piece ign units. The 630 and 670 are the same part # 501 77 51 01......the 625 has a different part # but the only difference is the addition of the hole through which you adjust the idle on the carb on the 625...like the later Husky and Jred saws in this family (Super IIs).....the others in this early case series adjust the idle via a screw threaded into the case, and have no hole in the cover. So the covers are the same size and height. What is different is the airfilter cover itself....all three of these Jonsereds have different covers. On the 625 the Kolbenschmidt cyl has the sparkplug set at the same tall angle as the Husky 272Xp and 268Xp cyls. So the 625 taller plug cover allows room for this. The 630 and 670 covers, though visibly different cover only a plug with the same angle as the 630...the 670 come back flat, rather than sloping like the 625 and 630, to allow for a much larger airfilter.
First two pics are of a 630 case and engine cover with a 268XP cly jnstalled....(which is the same size/shape as the 272XP)... first with the 630 filter cover and second pic with the 625 cover.
The other pics show a 625 cyl...a 630 cyl and a 272XP cyl...you can see the plug angles are the same on the 625 and 272 cyls and the 630 is a much shallower angle. 630 is always in the middle. The decomp on the 625 cyl was not factory......but added by someone......
I find it ironic that the lowly , down trodden, bottom of the ladder 625 ends up being the best platform to build a "sleeper" saw from!!!!!! With this knowledge a 625 II would be the best/preferred saw to modify of this whole Jred family!!!!
