Chainsaw Repair

Anyone have a set of timing #'s for 359.  Saw is worksaw. 
Shep

biggest thing on the 359 is the bottom of the jug on the transfer ports , that huge ledge that blocks off alot of the passage way into the transfer port needs to be ground to allow more air/fuel to pass , 359 is honestly a very good motor and ports well, it makes a good motor cause they do last as they normally donot turn up those real high rpms , sure you can port them to turn those high rpms but in a worksaw that is not needed , a saw that will hold 12,000 rpms in the wood under pressure is all you need and does not get hot and the crank bearings will last

If I read that correctly you have 19 degrees of rotation from the ex opening until the transfers open .That would equate to 19 degrees of blow down not 23 .23 would be a lot better though .

You're going to have to put the math to it .You need the extra transfer area for sustained high speed runs .As the speed increase  the time for transfer decreases therefore you need more area and/or more time open . There's a ratio involved related to speed but I can't remember it off the top of my head .

You have to keep in mind a lot of folks use software that pretty well figures this stuff out .I do it the old fashion way with the degree wheel and a port map .--as well as a little blind luck .

ok first thing I will tell you is this as I see alot of guys make this mistake , its far easier to find your porting numbers by going from just opening to fully close on you port , so lets do the ext port , bring down your piston until you just see light threw the very top of the ext. port , make this as small as you can, now set your degree wheel at zero, bring the piston down to BDC then back up to where you can just see the smallest amount of light threw the ext port , check your total degrees and divide by 2 , that is your degrees for the port on the ext. way to many guys have to much trouble finding TDC and if your porting off TDC you need to be exact on TDC which lots of guys are not , just being off .010 makes a big difference , next I would think you took the intake port and ext port to find your blow down, blow down is the difference between your ext. port and the transfers .
I see lots of guys cut huge transfer ports towards the intake port and some cut almost over top of the intake port, I do not do this at all , your port can only flow at the narrowest point so why cut a huge hole past that point , you are loosing speed in your income fuel/air charge this way , tht will work better on a pipe motor than a muffler motor cause the pipe will draw your fuel charge threw the port for you

I could suggest a few things except for  the fact what I know about Husqvarnas would fill a shot glass if all the info of same would fill the Atlantic ocean .Wrong color of orange for me .Now one color of yellow I might be able to do you some good except for all practical purposes McCullochs are just collecters items.

In case nobody ever turned you on to it this link will give you a lot of info .It's basic but it's a start . http://www.chuckbunnell.com/kart/jennings/jennings.html

Also a bike tuner by the name of McDizzey is a good one .RC sites are good as well as British bike sites .You can glean some info on chainsaw sites but it won't be much .Most just want to argue about it .Get what you can and like Ed said go at it a little bit at a time .You'll get it if you hang long enough .