Husky 272xp CFB style

[Canadian farm boy]

Buttoned everything back up

 

[Canadian farm boy]

With the topend wet with oil from assembling the saw it felt like it had a ton of compression. I didn't do a compression test because at this point the reading would be BS. I heat cycled the saw a couple times and took it out for a bit of run time.

 

[Canadian farm boy]

I was pleased with how easily the saw tuned/idled and ran but I felt something was missing. It just didn't quite have the feeling I was after.
I did a compression test and was surprised with the results. I got a reading of only 165 lbs.
when I first did all my squish measurements and checking the saw had a really tight stock squish. From the research I had done I figured that the AM cases must of had a lower deck height then oem so I was being extra cautious and didn't lower the cylinder as much as I otherwise would of.

 

[Canadian farm boy]

I made the decision that it needed more compression as well as a little more ignition advance. I didn't get any pictures of the rework but I cut another .020" from the cylinder base and squish band. I also filed another .010" from the flywheel key.
I rechecked my port timing knowing that it wasn't gonna what I had originally wanted. Originally I had the cylinder ported at 102/121/78. The port timing now was at 105/122.5/80.
I decided to leave the intake timing where it was at and raise the exhaust and transfers back up.
New port timing is 102/120/80.

 

[Canadian farm boy]

With the saw all back together I took it out for another test drive. This time I was quite impressed. It still tuned and idled really well but it had a different attitude. The throttle response is great and it makes great torque. It will tune wot to 14200-14500 and it holds approximately 10300 in the cut with a 24" bar, 7 pin and 3/8 full comp buried.
In this video I have the saw tuned a touch fat at 13800 for break in.

 

[Canadian farm boy]

Rechecked the compression again and was pleasently pleased with my reading

 

[Canadian farm boy]

Now finally happy with the saw it was time for the finishing touches.

 

[Canadian farm boy]

So to summarize what I did with the cylinder was I cut a total of .035 from the base and .040 from the squish band and sanded it for final squish clearance of .020. The finished port timing ended at 102/120/80.
Final ignition advance was approximately 6* with a total of .030 from the FW key

 

[Chainsaw Jim]

That was a good adjustment you made. It really woke it up.

 

[Canadian farm boy]

That was a good adjustment you made. It really woke it up.

Thanks Jim. It was fun build to do. Nice change from the stuff I normally do.

 

[Backtroller]

Wow, that really did make a difference. Awesome looking work as always. Enjoyed watching the build.

 

[p61 western]

Great thread and saw build Mike.

 

[Magic_Man]

Love me some 272, nice build thread CFB.

 

[RI Chevy]

Real nice job with the saw and the build thread Mike.
Don't go to the dark side. lol
We need you on Team Stihl.

 

[CJ Brown]

I think this is the most awesome build thread I have ever read!

 

[Frank bierce]

With the saw all back together I took it out for another test drive. This time I was quite impressed. It still tuned and idled really well but it had a different attitude. The throttle response is great and it makes great torque. It will tune wot to 14200-14500 and it holds approximately 10300 in the cut with a 24" bar, 7 pin and 3/8 full comp buried.
In this video I have the saw tuned a touch fat at 13800 for break in.

Very nice adjustments!! Runs very well!!

 

[beaglebriar]

Awesome thread Mike! That saw holds up well in the cut. I can see you're leaning on it pretty hard. It's a damn good runner.

 

[jacob j.]

Excellent work Mike- that saw has a very nice sound to it.

 

[TreeLife]

Well done Mike! Don't be afraid to play with other brands and models, I was excited to see you do a 2 series husky. They are badazz old saws

 

[CJ Brown]

I will do a proper review of Mike's work and my experience with getting my first ported saw some time in the near future, but I will say right up front that the whole process of getting a saw ported by Mike has been 1st class all the way. I couldn't be happier.