Chainsaw Repair

The bucking coil destroys some of the EMF of the main coil and it is dissipated to ground.

will try to get a handle on that thought above.

this thread has sidetracked way beyond a 'review' and 'bone stock'...... title maybe should read 'info thread'

-joe

Im thinking about changing out the ignition.  Echo offers both limited and non limited magnetos on their engines, hope to come up with something w/o spending alot of $.  The 'digital' type seem to be the limited ones but the amount of advance is also a consideration.  Current timing is; 11 degrees BTDC at 3k rpm, then 32 degrees BTDC at 8k rpm, which then drops one degree and stays at 31 degrees BTDC at 12k rpm.  13500 +/- 200 seems to be the magic number on the limiter. 

......snipped from a few posts up.

seems like it has a quick slope from idle to 8K, and quite a bit of total advance.  is this similar in most saws?  have tried to put a my light on my husq., with poor results after about 5K rpm.

wish my laptop could 'read' the .pdf.  if i update the adobe on this machine, will run out of memory due to update size.

good stuff bob!

-joe

Just found out that the 620p has a slope advance ignition and no limiter.  This is where theyre getting their other 10%.  Same flywheel as 600p, just a different module...$85.

nice find.  do you think that the slope and total advance differs as well?

-joe

put some time on the echo yesterday....... was volunteered to cut a few trees.  12" oak split over a shed,  clumps of sumac, downed pines, and some of thorny thing.

-only things of note are, how LOUD this saw is stock.  going through the oak slowed this thing down noticeably. 

nothing further done to the carby yet.  as is, won't win races in soft wood.  but, holds rpms well in everything except oak.

-joe

For the 620, I read somewhere that the bore and piston are a bit different than the 600. If it was factory ported, wouldn't there be a greater displacement volume than 60cc ?  Unless the intake and exhaust ports were widened... Carb is different too...somewhere else i read said that the semi fixed jet is gone, but I didn't dig into walbros site to do the proper cross reference yet.

The rev limited ignition discussion above makes sense, when you keep backing out the high speed screw on the 600p to feed more fuel, there is a point where the engine doesn't really sound like it's increasing in speed. It revs up, then immediately backs off to what sounds like a default max speed.

I also want that opposing dawg on the clutch cover, but still can't tell if it's just a matter of buying one plus the screws and drilling it onto the 600 clutch cover. (edit) - part number 99988802100 is the correct, factory outside spike (dawg) for cs600p and cs590 . 

We need someone to buy a 620 and do a basic tear down!

FYI, I gave the cs600p a pretty neutral and objective review on echo's (powerful saw, but I explained its design issues) and it got completely moderated out!  I took screenshots of my review, and I'll post it here eventually.