A Tale of Two 288's

[Eccentric]

Ive wondered why saws dont come with some sort of manual ignition timing lever, like a cam or something, that would advance and retard for easier starting then better running.

I know they can do that now with electronics and digital ignitions (like the new echoes have), just wondering why the idea never caught on with saws.

I believe many chainsaws already do that. Nothing new there.

Yep. Many of the OLD saws had adjustable timing. Last November I ran a sweet Wright C70 at our GTG. It had a lever for adjusting the timing. There was a 'start' and 'run' setting IIRC.

Model Profile: C70

 

[barneyrb]

I remember when I ran a little street car the ET's actually picked up a little (~.1) by retarding the ignition on the top end. I did this through the MSD unit......

 

[tpope]

Just dredging up some gold from the site. Had to bump this one so the new search engine can find it...

 

[james archibald]

Keep dredging these 288 threads up guys!

 

[Schells]

I will take all the 181 281 288 threads you can find. Have two of them and love em both.

 

[bryanr2]

this was a good read. is this the same epoxy that Randy is using in the 661cm's now?

Im digging the carb mod.

 

[srcarr52]

this was a good read. is this the same epoxy that Randy is using in the 661cm's now?

Im digging the carb mod.

I think it is, Devcon F.

 

[Nuno]

Love the thread. Watched your video on YouTube MANY times, hoping that one day my 288 will run like that.o
Had a few questions if you have the time.
1: how did you make the rollers for the carb? Mine is in need of a new one.
2: what do the porting numbers mean? mm's, degrees? I'm clueless.
P.s.: hope I don't make nobody mad for bringing up an old thread.

 

[srcarr52]

Love the thread. Watched your video on YouTube MANY times, hoping that one day my 288 will run like that.o
Had a few questions if you have the time.
1: how did you make the rollers for the carb? Mine is in need of a new one.
2: what do the porting numbers mean? mm's, degrees? I'm clueless.
P.s.: hope I don't make nobody mad for bringing up an old thread.

1. The roller had to be custom made and welded onto the throttle linkage of the WJ70 (394XP) carb. I used a lathe to make the parts and tig welded it on.
2. The numbers are given as the duration in crank angle that the port is open. I think there is a Porting 101 thread here you may want to consult for terminology.

 

[Nuno]

@srcarr52 I've done some reading since reading the post and I think I'm 60% there on understanding how porting works. I don't think id have a hard time mimicking your numbers.
Pretty sure I'll try it sooner or later