Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Efco Olympyk Oleo-Mac => Topic started by: farmboy on February 17, 2012, 10:27:07 am

Title: CS56-156 Cylinder
Post by: farmboy on February 17, 2012, 10:27:07 am

Picked up a CS56 (Efco956 or 156 must be a 956) crankcase, crank, P&C, carb, flywheel, coil, air intake system basically the motor minus the rear handle, bad crank bearing.  Wanted to use P&C for a 158.  Cylinder is single tranfer like a 272 Husky.  Robbed a piston out of a new 156 Efco for a customers saw.  Got out the 156 cyl. to compare to CS56 to decide which one to use.  The 156 cyl is dual transfer like a 372 Husky with a bridge in the top of the intake port.  I was suprised to see the difference.  After seeing the 156 cylinder I know why they are so strong for 46mm.  OILogging what did the cyl. look like on the 158 you built?
Shep

Title: Re: CS56-156 Cylinder
Post by: Old Iron Logging on February 17, 2012, 07:52:06 pm

I used the new dual transfer cyl for the 158. The new cyl is strong. I have an old style CS62 and the new 156 is every bit as strong in up to 20" wood.

Title: Re: CS56-156 Cylinder
Post by: farmboy on February 29, 2012, 06:38:22 am

I was comparing my 156/956 46mm piston to 162/962 48mm.  The newer 156 and 962 have a bridge in the middle of the intake port.  The 156 46mm has ring locating pins on the left and right on intake side (limits widening the intake).  The 962 has the top ring pin centered in the  intake.  Lower ring is on ex side well out of the way for widening ex.  Since both have the bridge can I move the ring pins on the 156 piston to the same location as the 162?  Looking @ them I don't see why not.
Just bought a KIC brand (seller said they were Tiawan) 156 46mm piston.  Am very very impressed with the quality of this piston. Very minimal flash in the windows interior casting excellent, etc.  He has 1 more I may buy it just to have in stock.  I'm liking this saw so much I'm getting rid of my 55 Huskys.  That's hard for a Husky man to do but this saw is way beyond a 55.
OIL what porting did you do on the 158?  The upper transfers don't look like there is much you can do to them except raise them?  Also, what timing numbers did you use on the 158?
Shep

Title: Re: CS56-156 Cylinder
Post by: Old Iron Logging on March 01, 2012, 08:34:40 pm

Don't know the #'s. Just widened the ports and raised the exhaust to my liking. Need to get a porting tool before I touch the transfers, did open the bottoms some. Going to try the cyl on a 156 bottom to see how it runs. Putting a 357 carb on it also.