Stock Husky 55 port numbers (stock form)?

[777funk]

Does anyone have this?

I traded for a saw with a Chinese p/c on it and would like to at least try to get it in the ballpark of OEM numbers.

 

[Bob Hedgecutter]

Um, might help if you explain firstly which 55 cylinder you have- 46mm open port or 45mm closed port.
Even better if you explain what you might be trying to achieve.
If you are thinking of grabbing some form of flex drive grinder and doing a bit of porting- buy or make your own degree wheel first and measure what you are starting with.

 

[777funk]

Um, might help if you explain firstly which 55 cylinder you have- 46mm open port or 45mm closed port.
Even better if you explain what you might be trying to achieve.
If you are thinking of grabbing some form of flex drive grinder and doing a bit of porting- buy or make your own degree wheel first and measure what you are starting with.

By the flywheel fins dividing 360deg/18fins=20deg, then further subdividing by half and ticks within the half. Approximate port timing on this cylinder appears to be:
Intake Open 62 BTDC
Intake Closed 72 ATDC
Intake Total 134 degrees

Exhaust Open 104 ATDC
Exhaust Closed 261 ATDC (or 99 BTDC)
Exhaust Total 157 degrees

TDC found by rotating crank until piston stopped upward travel, continuing to rotate until piston started downward travel, I counted TDC as the center of these two points. (no piston movement for 3-4 degrees).

Edit: 46mm open port. Squish more than 0.062" solder. Wow. Going to bring that down first. Hopefully to 0.020.

AND... I printed a degree wheel and stuck it to the rotating section of the clutch (would have been harder on a Stihl). My TDC was off. With a piston stop, I'm getting more accurate numbers now.

 

[777funk]

Anyone have the Husky 55 Open Port Stock measurements?