Jonsered 625 II upgrade with Husq 272xp parts question.

[DSS]

On my 625 there's a hole in the airbox under the carb, I didn't know what it was for, I assumed there was a plug in it at one time?

 

[Cantdog]

On my 625 there's a hole in the airbox under the carb, I didn't know what it was for, I assumed there was a plug in it at one time?

Yes there's supposed to be a rubber bumper that snaps into that hole...supports the center of the carb...

 

[deezlfan]

The 625 II I have has the one piece ignition. It only has one fuel line running from the tank. After looking at the 625 carb, I see the high idle feature built into the levers. Quite simple really. Have to complete the teardown and salvage of useable parts from the 272 this weekend.

 

[old 040]

i installed a 272 top end on my type II, i used my 625 carb and drilled a small hole in one of the transfers, installed a barb for my pulse line, it has been working very well for two years now, and the 625 carb seams to be more than enough for this set up, it still four stokes as it should............... also, my top covers went right on, if anything, i may have ground off some of the inner cover baffling to make it fit, but i remember it was quite easy to do

 

[SawTroll]

i installed a 272 top end on my type II, i used my 625 carb and drilled a small hole in one of the transfers, installed a barb for my pulse line, it has been working very well for two years now, and the 625 carb seams to be more than enough for this set up, it still four stokes as it should............... also, my top covers went right on, if anything, i may have ground off some of the inner cover baffling to make it fit, but i remember it was quite easy to do

I'm not sure if it is more than enough, but according to the 1993 IPL, the carb of the 625 II has the same venturi as the 670 II (champ) - and also the same as the 272xp (11/16" - 17.5 mm).

 

[old 040]

I'm not sure if it is more than enough, but according to the 1993 IPL, the carb of the 625 II has the same venturi as the 670 II (champ) - and also the same as the 272xp (11/16" - 17.5 mm).

wish i had a stock 272 to compare it to, but can say it's night and day from a stock type II, i did wonder if the carb would be big enough, but i did need it because of the built in throttle lock, i'm sure it would run better with a 272 carb, but i wanted the throttle lock, so i stayed with the carb i had, and i'm still more than pleased with how well it runs...............

 

[SawTroll]

wish i had a stock 272 to compare it to, but can say it's night and day from a stock type II, i did wonder if the carb would be big enough, but i did need it because of the built in throttle lock, i'm sure it would run better with a 272 carb, but i wanted the throttle lock, so i stayed with the carb i had, and i'm still more than pleased with how well it runs...............

I don't really know, but there may be other differences in the carbs than just the venturi (that is the same), that makes a difference? :msp_confused:

 

[elanjoe]

And the 272 manifold and the correct carb bolts that fit the cyl..

for the record , 350 muffler bolts work great

 

[deezlfan]

Got most of the parts cleaned up and a quick mock-up of the cylinder on the case looks good. The 272 carb set-up looks like the way to go. The 272xp air filter does not fit under the 625 cover but there is no problem with the spark plug. SO if I decide to use the 272xp air filter, I will have to use the Husq top cover. One hold down screw doesn't line up, but drilling the rail and tapping the hole in the correct place does not seem to be a problem. There is even some extra meat built into the rail at the correct location. If I decide to use the Jons filter, everything will look factory.I am going to see if I can install the Husq throttle controls in the Jons rear handle. The tanks are soaking now and I will see what I have in a day or two.

Here is the only thing I found that could really drive you nuts swapping parts on this saw. The flywheel on the left is the 625 part. It has a cast in flywheel key, location marked with a black Sharpy. The 272 fan is on the right and has a keyway cut in it. In this photo, both are at 12:00 o'clock. Notice how the magnets are in completely different locations. So mixing parts isn't as simple as it sounds.

View attachment 286559

 

[Cantdog]

OK you guys sayin you've bolted a 272 top end on a 625 with no sparkplug height issues gave me pause.......I have had these problems....I don't think I'm unique....so what is the deal....I have a 630 on the motor stand now with a 268XP cyl. on it...the stock engine cover fits fine but the air filter cover/spark plug cover will not fit.....I swapped the 268XP out for a 272XP ......exactly the same...then it occured to me that I am using the older 2 piece ign cases and top covers. You guys are all working with the one piece ign cases and those top covers.....these are two totally different units.....apparently the late model, one piece ign cases and covers will work without modification with the husky cyls. Very good info indeed......been waiting for a set of late 625-670 mint cases to put my 272XP cyl on...stihl waiting....

 

[Cantdog]

Got most of the parts cleaned up and a quick mock-up of the cylinder on the case looks good. The 272 carb set-up looks like the way to go. The 272xp air filter does not fit under the 625 cover but there is no problem with the spark plug. SO if I decide to use the 272xp air filter, I will have to use the Husq top cover. One hold down screw doesn't line up, but drilling the rail and tapping the hole in the correct place does not seem to be a problem. There is even some extra meat built into the rail at the correct location. If I decide to use the Jons filter, everything will look factory.I am going to see if I can install the Husq throttle controls in the Jons rear handle. The tanks are soaking now and I will see what I have in a day or two.

Here is the only thing I found that could really drive you nuts swapping parts on this saw. The flywheel on the left is the 625 part. It has a cast in flywheel key, location marked with a black Sharpy. The 272 fan is on the right and has a keyway cut in it. In this photo, both are at 12:00 o'clock. Notice how the magnets are in completely different locations. So mixing parts isn't as simple as it sounds.

View attachment 286559

The reason you have problems with the left hand front hold down screw is that you are using mismatched covers/cases...early vs. late.

Now on the issue of the fans......the ign pickups are in the same position on the 625II and the 272XP...so the magnets should pass by the pickup at the same time...timingwise...the only other thing to check is location of the keyway in relation to the crank position......it may well (must) be that the keys ways are in different positions from the 625 to the 272........meaning the cranks are different.... I would use the 625II fan.....but I do notice the 272 fan has more cooling vanes than the 625II flywheel to deal with more power/heat....they key is really unimportant once the flywheel is tightened down properly.....but you will have to accurately locate the 272 flywheel on the crank and mark it for the future.

 

[deezlfan]

I want to start a build thread as this saw comes together but it will be a couple of weeks before the piston ring arrives. I am working on cleaning everything up and getting evrything laid out in order. More soon.

 

[Cantdog]

Good luck deeze.......we'll be watching....

 

[deezlfan]

Anyone know if there is another front handle bar that will fit the 625. Mine seems to be missing. The Husqy handle is too short.

 

[DSS]

Anyone know if there is another front handle bar that will fit the 625. Mine seems to be missing. The Husqy handle is too short.

Mine is bent, and I thought someone told me a 61 handle would fit. Robin will know.

 

[mt.stalker]

I've had a 625 II sitting on the bench for a couple of years and a buddy walked through the door with a 272xp the other day. The 272xp was a victim of a tree falling on it that crushed the clutch, bent the crank and broke the bottom corner off the saw below the bar mount. The rest of the saw is in good condition. I have been reading all the upgrade threads I could find and it seems having the entire top end, carb and linkage with that large muffler make this a pretty simple upgrade. The question is: Will there be any other parts I need? Will I need the taller top cover from a 670? Will there be any location changes/modifications I need to do?

A compromise on the carb would be to use a H256 from a 630 Super, as it is pulsed through the intake block, yet has the hi idle set with the choke lever. Or, if it's in good shape, the 272 tank could be bolted onto the Jonsered crankcase. Of course, now we're talking about a strange looking saw. Kind of ending up like this one. This was an early 625 that got banged up a bit. Put a 670 top end on it and a Husky 268 tank. I can set the hi idle either way!

:msp_thumbsup: :msp_thumbup: I love Frankensaws

 

[Cantdog]

Anyone know if there is another front handle bar that will fit the 625. Mine seems to be missing. The Husqy handle is too short.

It has to be a Jonsered handle......Husky handles will not fit the Jonsered tank and vice-versa.......you can put an orange tank on your saw but you will need a Husky handle.

Husky handles are angled back and the bottom mount on the tank is also.....Jonsered Handles are straight across and the bottom mount is as well...

You need one from a 625, 630 or 670.....

 

[spike60]

OK you guys sayin you've bolted a 272 top end on a 625 with no sparkplug height issues gave me pause.......I have had these problems....I don't think I'm unique....so what is the deal....I have a 630 on the motor stand now with a 268XP cyl. on it...the stock engine cover fits fine but the air filter cover/spark plug cover will not fit.....I swapped the 268XP out for a 272XP ......exactly the same...then it occured to me that I am using the older 2 piece ign cases and top covers. You guys are all working with the one piece ign cases and those top covers.....these are two totally different units.....apparently the late model, one piece ign cases and covers will work without modification with the husky cyls. Very good info indeed......been waiting for a set of late 625-670 mint cases to put my 272XP cyl on...stihl waiting....

Yeah, the early top covers were a little shorter, and that's gotta be what you're running into. The mufflers also become an issue here, as using the taller muffler on the older saw will result in the top coover actually resting on the muffler. Probably wouldn't go too long without some melting taking place. Also of note is that the early muffler is NLA. Most aftermarket muffs are the new taller style. Tilton has one early AM unit but it's not the world's greatest flowing muffler.

 

[deezlfan]

Found a handle. Dragged home 4 parts saws yesterday and there was one good handle in the bunch.

 

[AlphaTech]

i installed a 272 top end on my type II, i used my 625 carb and drilled a small hole in one of the transfers, installed a barb for my pulse line, it has been working very well for two years now, and the 625 carb seams to be more than enough for this set up, it still four stokes as it should............... also, my top covers went right on, if anything, i may have ground off some of the inner cover baffling to make it fit, but i remember it was quite easy to do

Any pics of the hole you drilled and what size barb you used? Did you epoxy it in? I'm interested in doing the same thing to my 625 II.