262 vs 266 vs 268 ??

[SawTroll]

The 272 on the 268 is good...I am not sure if you would actually gain much by putting the 268XP on the 266 without upgrading the carb/intake situation to the later 268XP setup...

Yes, that is what I thought as well.

 

[Cliff R]

"The 272 on the 268 is good...I am not sure if you would actually gain much by putting the 268XP on the 266 without upgrading the carb/intake situation to the later 268XP setup..."

+1

I did the 60 Rancher to 268XP conversion, but had to use the smaller carb and different elbow and air cleaner set-up. The saw was considerably stronger than the 60 P/C, but not nearly as strong as my 268XP "Special".

There is very little difference in power and cutting speed between a 268XP and 272XP. It often boils right down to which chain is sharper or which one has the shorter bar on it. A few years ago we were cutting up an rock hard Red Oak log. I had my 268XP finely tuned with a razor sharp chain. My friend had his 272XP borrowed from his employer (Tree Service Company) in the same log. The difference thru the log was hardly even measurable, 1-2 seconds one way or the other for most cuts......Cliff

 

[roncoinc]

"The 272 on the 268 is good...I am not sure if you would actually gain much by putting the 268XP on the 266 without upgrading the carb/intake situation to the later 268XP setup..."

+1

I did the 60 Rancher to 268XP conversion, but had to use the smaller carb and different elbow and air cleaner set-up. The saw was considerably stronger than the 60 P/C, but not nearly as strong as my 268XP "Special".

There is very little difference in power and cutting speed between a 268XP and 272XP. It often boils right down to which chain is sharper or which one has the shorter bar on it. A few years ago we were cutting up an rock hard Red Oak log. I had my 268XP finely tuned with a razor sharp chain. My friend had his 272XP borrowed from his employer (Tree Service Company) in the same log. The difference thru the log was hardly even measurable, 1-2 seconds one way or the other for most cuts......Cliff

Good stuff Cliff.
however the 268 i have is not an XP.
so i think the 272XP topened on the plain 268 should make a good diff ??

 

[Cliff R]

Agreed, the largest bore diameter will help offset any losses due to restrictions in the carburetor and air cleaner assembly.

Like I said earlier, the 60 to 268XP build was fun, and educational, but next time I'll buy a 272XP with a smoke P/C in it......Cliff

 

[SawTroll]

Agreed, the largest bore diameter will help offset any losses due to restrictions in the carburetor and air cleaner assembly.

Like I said earlier, the 60 to 268XP build was fun, and educational, but next time I'll buy a 272XP with a smoke P/C in it......Cliff

There never was a 60, I assume you refer to the 61.

 

[Cantdog]

The 268 cylinder I gave him is far from stock

10-4, understood, but to properly utilize the "unstockedness" he will definately have to upgrade the fuel/air delivery system. So if that's the direction he wants to go in, with the 266, then yes the ported 268XP cyl will make definate improvements with correct intake and exhaust, over the stock 266cyl. and carb setup.

 

[Cantdog]

Good stuff Cliff.
however the 268 i have is not an XP.
so i think the 272XP topened on the plain 268 should make a good diff ??

Ron you're still awake??? Gee I thought you'd be "heels up" in you recliner with beer and nachos spilled in your wiskers and the TV still going by now!!!! LOLOL!!!!

Yes it is good stuff from Cliff. I read and reread all of his posts about doing the 61 to 268XP conversion. A tremendous amount of info and insight on thses saws. I used his info to determine what I was going to do. Of course I spun off in a few different directions and experiments but without the basic knowledge he left for us to read I'm not sure how sucessful I would have been. So thank you Cliff!!!

 

[272super]

10-4, understood, but to properly utilize the "unstockedness" he will definately have to upgrade the fuel/air delivery system. So if that's the direction he wants to go in, with the 266, then yes the ported 268XP cyl will make definate improvements with correct intake and exhaust, over the stock 266cyl. and carb setup.

Is the actual cylinder intake opening on the 268xp the same oval type as the 266xp? All the 268's I've had were the open port type with the 61,272 type opening where the bottom of opening is wider/offset than top part. Just curious,thanks.

 

[HiOctane]

Is the actual cylinder intake opening on the 268xp the same oval type as the 266xp? All the 268's I've had were the open port type with the 61,272 type opening where the bottom of opening is wider/offset than top part. Just curious,thanks.

266 had a different intake shape than 268.The 268 had a "dent" on the left side of the intake reducing width .268 had also stud tru carb and flange while 266 has two bolts holding the carb flange and two bolts holding carb itself.

 

[Cantdog]

The intake port shape is similar on the 268XP but the real increase is in the diameter of the bore in the manifold and the larger bored carb (260A) and of course if you are porting you are going to widen the cyl intake tract as much as possible.

 

[nysff]

268XP gets my vote
<a href="http://s837.photobucket.com/albums/zz294/engine907/?action=view&amp;current=IMG_1141.jpg" target="_blank"><img src="http://i837.photobucket.com/albums/zz294/engine907/IMG_1141.jpg" border="0" alt="Photobucket"></a>

 

[brucejr]

10-4, understood, but to properly utilize the "unstockedness" he will definately have to upgrade the fuel/air delivery system. So if that's the direction he wants to go in, with the 266, then yes the ported 268XP cyl will make definate improvements with correct intake and exhaust, over the stock 266cyl. and carb setup.

Aahh gotcha. Ron if you want the carb and intake setup let me know, its yours

 

[Cliff R]

"Yes it is good stuff from Cliff. I read and reread all of his posts about doing the 61 to 268XP conversion. A tremendous amount of info and insight on thses saws......So thank you Cliff!!!"

You are welcome. It's been quite a while since I did the 61 to 268XP mod, but I do remember the Tillitson carb wouldn't work, and the spark plug is tall enough to require modding the 61's top cover. It took me a while to find an intake as well. and the smaller diameter fasteners. I was lucky enough to find a really nice Mahle P/C on Ebay. You could easily tell that my 268XP Special is faster and more high rpm oriented than the converted 61, but the jump from the open port 61 P/C to the closed port 268XP is significant, even with the smaller intake set-up.

I didn't keep the modded 61 very long, as a good friend of mine just had his old Stihl die on him, and needed a firewood saw. He showed one day when I had the 61 in the woodpile cross-cutting some pretty big chunks of wood. He ran it once, and just had to have it. It's still running fine for him now after several years pf hard use......Cliff

 

[Cantdog]

Yeah some of the problems you encountered I didn't seem to have like cover interference and the first itteration used a ported 268 nonXP cyl and a 266 intake with the 163A carb. As you said that too was way better than the original 61. Then I found a real good 268XP cyl on ebay and since I emboldend by my first imediate sucess I went for it but used an XP intake and a 250A from a 670 Jonsered to get the flow up and I really like the Jred choke/high idle setup so I went in that direction (it's the one in my sig) It started second pull after the build and just will put a smile on your face with the 20" Carlton buried and you dig in the dogs and pivot right on through without hardly any rpm loss. Used it yesterday to fell and buck about a cord of 24" hack. (larch) I am so impressed I'm now building a 672 Jonsered (LOLOL) along then same lines but with the single coil (Ducati) ign and a 272 top end (ported of course) with a west coast 670 Super 250A and matching oversized intake elbow with a matching velocity stack with K&N filter, full wrap etc. Don't need any of it but doing it cause I can!!! Again reading your posts of sucess allowed me to "think outside the box" now see what you done????? LOLOL!!!! I'm outa control!!!! But I am having fun!! Thanks again!!

 

[272super]

I've noticed some mention changing out the 163 carb over to the larger 260A. The 266xp type 224A is the same carb as the 260A except for the carb adjustment portion. It would make modification easier on the 61,66, early 266SE saws since the case mounted idle screw would be retained. According to parts listing, I think the last year of the 266SE(1985) was when they switched to the 224A carb which would be used on the later 266 XP models. The 224A/260A both have 20mm outlet bores and the 163 has the 18mm bore. Am I missing anything here?

 

[Cantdog]

I've noticed some mention changing out the 163 carb over to the larger 260A. The 266xp type 224A is the same carb as the 260A except for the carb adjustment portion. It would make modification easier on the 61,66, early 266SE saws since the case mounted idle screw would be retained. According to parts listing, I think the last year of the 266SE(1985) was when they switched to the 224A carb which would be used on the later 266 XP models. The 224A/260A both have 20mm outlet bores and the 163 has the 18mm bore. Am I missing anything here?

I don't think you are....the larger bore carb (larger than the 163) is what is important...but do you know what the difference betyween the 224 and the 260 would be, beside the idle screw placement????

 

[272super]

I don't think you are....the larger bore carb (larger than the 163) is what is important...but do you know what the difference betyween the 224 and the 260 would be, beside the idle screw placement????

There is none beside the screw setup. They both have the same bore size on each end,same internals etc. I have them both setting in front of me and I don't see any other difference.

 

[Cantdog]

AHHH Cool.... good info to have...I don't think any saws I have use the 224...the 224 has the idle screw in the "through the case" setting that pushes on the throttle arm and the 260 has the idle screw in "through the cover configuration that has a screw with a taper head. Again good to know..Thanks

 

[SawTroll]

I've noticed some mention changing out the 163 carb over to the larger 260A. The 266xp type 224A is the same carb as the 260A except for the carb adjustment portion. It would make modification easier on the 61,66, early 266SE saws since the case mounted idle screw would be retained. According to parts listing, I think the last year of the 266SE(1985) was when they switched to the 224A carb which would be used on the later 266 XP models. The 224A/260A both have 20mm outlet bores and the 163 has the 18mm bore. Am I missing anything here?

There is none beside the screw setup. They both have the same bore size on each end,same internals etc. I have them both setting in front of me and I don't see any other difference.

Another piece in the puzzle!

 

[huskydude]

another thing i found is the change in top cover bolt patterns.
i was trying to find a top cover for my 1984 266se and it was a pita.

You can see the difference if you look at a 266se and 272xp picture on acres site. It makes sense now why they did it, due to the aforementioned carburetor changes and how they are adjusted.