P&C interchange guide

[064AV]

I've ran into this chart a few times, and it seems to be accurate...



Bill's Saw Shop - Stihl chain saw specifications

 

[yldflight]

Anybody know if there is a Dolmar (or any other) equivalent (56mm) piston for a Solo 603?
I am desperate to find a piston that will work in my 603 as i can't find/locate a new piston.

What alternative cylinders will fit on a Solo 603. The stoke is 42mm which is exactly the same as the stroke on the Husqvarna 3120 - a very tempting idea.

 

[Logger4Life]

346-1.28''
357-1.34''
372-1.42''
385-1.46''
395-1.50''

source-husqvarna website

Hi Logger4Life here again to get this Husky stroke thing right . A 362,365,371,372,and the 372xpw all have a 36mm stroke which is 1.42 inches which is also the same stroke as a 044,046, and MS460 Stihl. I am not sure about the 357xp but I think that it is the same also but do not quote me on that.
Now as for the Husky 385xp and the 390xp they both share the same crank they are interchangeable and have a 38mm stroke which is 1.5 inches. And the 394 and 395xp share the same crank which also is 38mm and 1.5 inches.
2100/2101/298xp 40mm stroke which happens to be the same stroke as a 064,066, and MS660 Stihl
3120xp has a 42mm stroke.so there it is I can make a chart up but I do not know what will all interchange with what that is for the builders to share.

 

[Logger4Life]

Husky Bore and stroke chart

Husky: Bore / Stroke
362/365: 48mm / 36mm-1.42"
371/372: 50mm / 36mm-1.42"
372xpw:51.4mm/ 36mm-1.42"
281xp : 52mm / 38mm-1.50"
288xp : 54mm / 38mm-1.50"
385xp : 54mm / 38mm-1.50"
390xp : 55mm / 38mm-1.50"
394xp : 56mm / 38mm-1.50"- Dual transfer ports
395xp : 56mm / 38mm-1.50"- Quad transfer ports
2100,2101
298xp : 56mm / 40mm
3120xp: 60mm / 42mm

 

[Logger4Life]

Dolmar/Makita and Solo Bore and stroke info

I have done alot of mixxing and matching of P&C on 6400/6401 through 7900/7901 along with Solo 681's and this is what I have learned so far .
Dolmar/Makita's 6400-7900 all have a 37mm stroke which is 1.46" and all Solo's 665-681s all have a 38mm stroke which is 1.50" plus the rod is longer by 1mm or 0.040" so you need a total of .060" plus a base gasket of which I prefer the Dolmar metal base gasket which is not only stronger but thinner by 2 or 3 thousands of an inch. the easiest way to put a dolmar 7900P&C on a Solo 665,675,or a681 for that matter is to order the big bore kit adapter plate from Bailey's which is .060 thick and the order your 7900 P&C fom a Dolmar dealer and ask for the metal base gasket which is .017 thick =.077 perfect.
Now as for the bore sizes 6400/6401/6421/6410 and 665 all 48mm 7300/7301 and 675 all 50mm 7900/7910/7901/7921 and 681 all 52mm. transfer port design 6400's and 665 open port transfers 6 ports. 7300's, 675's ,7900's, and 681's all Quad port transfer design.

On another note I want to make the ultimate felling saw put a 681 crank in Makita case or a Dolmar case with a 7900 P&C new piston design just a mild port job so it won't get to hot and cause tank vent problems and the HD air filter kit and a Walbro HD-12 carb from a 681 or a 372. I have one but backwards it is a 681 with a ECsaws 7900 P&C on it and man that saw will out cut every saw I have put it up against and it's just a work saw. It is amazing for a 81cc saw. I just wish it had the better air filter and the extra pound missing like my 7900's.

 

[Tempestv]

Dolmar/Makita's 6400-7900 all have a 37mm stroke which is 1.46"

Based on this, the Makita 7301 cutoff saw has the same bore/ stroke as the 7301 chainsaw. Any idea if the chainsaw cylinders will interchange with the cutoff saw? Looking at some of the parts breakdowns, the chainsaw and cutoff saw cylinders certainly look different.

 

[Freakingstang]

Based on this, the Makita 7301 cutoff saw has the same bore/ stroke as the 7301 chainsaw. Any idea if the chainsaw cylinders will interchange with the cutoff saw? Looking at some of the parts breakdowns, the chainsaw and cutoff saw cylinders certainly look different.

You can physically put the p/c off of the cutoff saw onto the chainsaw, but it is an open port cylinder just like the 6400/6401. It is meant for brute torque and won't rev very high at all.

I have seen Husky 345 saws on ebay with a 350-something piston and cylinder.

What P&C would fit the 345?

Thanks,

Hal

The husky 345, 346, 350,351, 353 all share the same case, plastics, controls etc. the 346, 351, 353 are magnesium case, where as the 345, 350 is plastic. Jonersed models are the 2145, 2150, 2149 (351 equivalent) 2153, 2151. So basically any of those piston and cylinders will interchange. You may need the cylinder mounting base depending on which way you are going.

Some of is the key here, most 50s interchange with the P5000/500 and Jonsered 490, and not with the 55/51 - as I understand it (I am no expert on these saw models).

The Parnter 5000 was 44mm closed port
The partner 5000 plus was 45mm close port
The partner 500 was 45mm open port with a large Combustion chamber

The Husky 50 had a 44mm open port 49.xxx cc
The husky 51 came with both the 45mm open port and 45mm closed port 50.9 cc
The husky55 (both regualr 55 and the 55 rancher) came with 45mm closed port 51cc(rare) and 46mm open port 53cc. Some of these had a decomp on them.

The Jonsered 490 is identical to the partner 5000.
The jonsered 590 is the same as the partner 5000 plus.

Now, all of the cylinders will fit on a 51 or 55 case. The 46mm cylinder wont fit the older 490,5000, and 50 cases as the bore of the sleeve is too big to fit into the case. There are some differences in the carb manifolds, and exhausts between the brands, but you can take the older 5000, 5000 plus, 490, 590 closed port cylinders and put on a 55case and with a little port work are absolute screamers.

The best, are rarest cylinder is the 5000 or 490 cylinder. it is 44mm and keeps saws that race legal in the 3 cube class and has the smallest combustion chamber. It is about the diameter or a dime whereas the 5000plus and 590and husky 51 closed port have a chamber the diameter of a quarter. the smaller chambers run better than the 1mm larger cylinders.

I have heard rumors of a 46mm closed port, but have had 25-30 of these saws and have never seen on on a husky 55. i'm not saying they aren't out there.

on the husky versions, the older 50 carbs did not have a choke plate (white and grey top saws) They used a lever in the top cover that pressed the center of the air filter down to close off the carb making a crude choke.

the orange top saws(51 and 55) had choke "butterfly" in the carb that was activated by a lever. There are more differences between the models, but almost all the engine parts will interchange between the cases.

The 362xp, 365, 365 special, 371xp, 372xp, 371K, 375K are all the same case. all the varients of cylinders and pistons will interchange. The only difference is the 362 case had the small husky bar mount.

 

[Tempestv]

You can physically put the p/c off of the cutoff saw onto the chainsaw, but it is an open port cylinder just like the 6400/6401. It is meant for brute torque and won't rev very high at all.

Actually, I'm looking to go the other way- chainsaw cylinder on cutoff saw. Would that work?

 

[chainspeed]

Back in the 80's had a good Husky dealer. I would buy new 2100's and have the dealer exchange 285 p@c,no charge +warranty.Me and my crew used them for felling,plenty of power for 20" bar with lots more trees per tank.

 

[Eccentric]

Back in the 80's had a good Husky dealer. I would buy new 2100's and have the dealer exchange 285 p@c,no charge +warranty.Me and my crew used them for felling,plenty of power for 20" bar with lots more trees per tank.

You did that (2100+285PC swap instead of buying a 285) to get yourself a 285 with a manual oiler correct?

 

[wcorey]

Quote Originally Posted by Tempestv View Post
Based on this, the Makita 7301 cutoff saw has the same bore/ stroke as the 7301 chainsaw. Any idea if the chainsaw cylinders will interchange with the cutoff saw? Looking at some of the parts breakdowns, the chainsaw and cutoff saw cylinders certainly look different.

You can physically put the p/c off of the cutoff saw onto the chainsaw, but it is an open port cylinder just like the 6400/6401. It is meant for brute torque and won't rev very high at all.

I picked up a Makita 7311 cutoff saw carcass with hopes of using the cylinder on my 6401, was cheap enough to make it worth the chance even though I had no idea if it was feasible.

Haven't gone as far as stripping the 6401 down completely but my initial observations after removing the muffler are that there's no threaded boss on the 7311 cylinder for either the top left av spring or the top muffler mount. Otherwise appear to be pretty similar externally, though the 7311 has quad closed port transfers with a windowed piston. Looks like the 6401 top end could go on the 7311 but not easily the other way around. Could potentially weld the bosses in but not worth the trouble.
Don't want to go BB so I guess I'll keep looking for a 7900 cylinder...


Bill

 

[ncfarmboy]

I have done alot of mixxing and matching of P&C on 6400/6401 through 7900/7901 along with Solo 681's and this is what I have learned so far .
Dolmar/Makita's 6400-7900 all have a 37mm stroke which is 1.46" and all Solo's 665-681s all have a 38mm stroke which is 1.50" plus the rod is longer by 1mm or 0.040" so you need a total of .060" plus a base gasket of which I prefer the Dolmar metal base gasket which is not only stronger but thinner by 2 or 3 thousands of an inch. the easiest way to put a dolmar 7900P&C on a Solo 665,675,or a681 for that matter is to order the big bore kit adapter plate from Bailey's which is .060 thick and the order your 7900 P&C fom a Dolmar dealer and ask for the metal base gasket which is .017 thick =.077 perfect.
Now as for the bore sizes 6400/6401/6421/6410 and 665 all 48mm 7300/7301 and 675 all 50mm 7900/7910/7901/7921 and 681 all 52mm. transfer port design 6400's and 665 open port transfers 6 ports. 7300's, 675's ,7900's, and 681's all Quad port transfer design.

On another note I want to make the ultimate felling saw put a 681 crank in Makita case or a Dolmar case with a 7900 P&C new piston design just a mild port job so it won't get to hot and cause tank vent problems and the HD air filter kit and a Walbro HD-12 carb from a 681 or a 372. I have one but backwards it is a 681 with a ECsaws 7900 P&C on it and man that saw will out cut every saw I have put it up against and it's just a work saw. It is amazing for a 81cc saw. I just wish it had the better air filter and the extra pound missing like my 7900's.

My 665 (that I'm converting to 681 w/7900 P&C) has a quad port cylinder like the 7900. The Mahle cylinder casting # is 52ZK13 W2. When I pulled the cylinder I saw 52ZN and I almost fainted. I thought they had mistakenly put a 681 cyl. on it. Also has windowed piston.
Shep

 

[bucknfeller]

This is a good thread, it needed a bump.


Has anyone found a piston that will work in a 55 closed port cylinder without too many mods?

 

[sachsmo]

The old Sachs Dolmars were some long stroking machines.

I have ran some numbers on a few,

If you put a cylinder with the bore of the old Skil 1690 on a 42mm stroke 153=155cc, pretty good but not quite 10 cubes.


Put that same bore on a 48mm stroke 166=177cc 10.8 cubes! Who needs a 10 cube 090?

 

[SawTroll]

....

The Parnter 5000 was 44mm closed port
The partner 5000 plus was 45mm close port
The partner 500 was 45mm open port with a large Combustion chamber

The Husky 50 had a 44mm open port 49.xxx cc
The husky 51 came with both the 45mm open port and 45mm closed port 50.9 cc
The husky55 (both regular 55 and the 55 rancher) came with 45mm closed port 51cc(rare) and 46mm open port 53cc. Some of these had a decomp on them.

The Jonsered 490 is identical to the partner 5000.
The jonsered 590 is the same as the partner 5000 plus. .....

A lot of good info in your post, but I believe some of the quoted info is not quite correct;

1) The P5000+ was not originally 45mm, even though it has been claimed to be many times on here. Of course 590 top ends may have found their way to some of them. At least this is what was established in a recent thread on here....

2) The original P500 were 44mm, only the later Formula 500 was 45mm?

3) The 44mm ones are 48.7cc, not 49.something, with the 32mm stroke that these saws have.

4) I believe the closed port top ends that were used on some 51s was a 44mm.

Another obsevation is that the 45mm closed port top end that was used on the 55 is not the same one as was used on the 590, it has a larger combustion chamber.

There also was a 46mm closed port top end that was used on the P5500 and PP325, in addition to those mentioned above. However, those top-ends may be even harder to come by than the 45mm closed port ones....

 

[SawTroll]

My 665 (that I'm converting to 681 w/7900 P&C) has a quad port cylinder like the 7900. The Mahle cylinder casting # is 52ZK13 W2. When I pulled the cylinder I saw 52ZN and I almost fainted. I thought they had mistakenly put a 681 cyl. on it. Also has windowed piston.
Shep

There are several exemples where the casting numbers on Mahle cylinders does not fit with the bore inside. It looks like it is only about the outside of the cylinder casting....

 

[SawTroll]

Husky: Bore / Stroke
362/365: 48mm / 36mm-1.42"
371/372: 50mm / 36mm-1.42"
372xpw:51.4mm/ 36mm-1.42"
281xp : 52mm / 38mm-1.50"
288xp : 54mm / 38mm-1.50"
385xp : 54mm / 37mm-1.46"
390xp : 55mm / 37mm-1.46"
394xp : 56mm / 38mm-1.50"- Dual transfer ports
395xp : 56mm / 38mm-1.50"- Quad transfer ports
2100,2101
298xp : 56mm / 40mm
3120xp: 60mm / 42mm

Corrections in bold.

 

[splitpost]

has anyone used a different piston in a stihl 026,just cruising the net I found that meteor make a piston for the dolmar 111 ,should be a direct replacement,are they windowed ???

 

[chainsawman2011]

stihl 021/ms210 can be made into a 025/ms250 by changing p/c and crank
husky 181, 281, 288 you can make a 181/281 into a 288 by changing p/c

 

[nk14zp]

395 w/ 3120 top end and crank

Wish that would work on a Jred 2095.