timing chainsaw

[fishndvm]

I just changed the coil/plug wire assembly on a 3516 McCulloch chain saw. There was no spark before the change, and now there is spark. Unfortunately, I can now kick her over, but as soon as I try to rev her up, she stalls. Does changing the coil change the timing, and how the heck do you time one of these things?

 

[jimr]

Re: timing chainsaw

i think it should be like other small engines with a keyed flywheel you might have to set the airgap on the coil.

 

[Kenneth Brown]

Re: timing chainsaw

jimr is correct to the best of my knowledge.

 

[backdraft]

Re: timing chainsaw

The mixture is a little lean. Turn the mixture screw counter clockwise a quarter to a half turn. Might help. Long distance tuning is tough.

 

[byordy]

Re: timing chainsaw

If the chainsaw has a single coil/plugwire assembly & no points it is timed by the amount of air gap. When I replaced the coil on my Lawn Boy lawn mower I checked with the local Lawn Boy shop to determine the proper air gap. Seth (the lawn mower guru) said he didn't remember the Lawn Boy spec, he just allways used a business card. Loosen the screws holding coil, place the business card between the coil and the flywheel magnet, and let the flywheel magnet pull the coil tightly against the business card. Then tighten the screws, remove the business card, put everything back together, and mow grass. The chain saw is probably the same way except the last instruction would read "cut wood". <br />Bill......

 

[majormotion]

Re: timing chainsaw

No. Changing the coil will not change the timing. When you adjust the gap on the coil that just provides an air gap that will allow the coil to fire when the magnet passes the coil. If you did not take off the flywheel then your timing will be the same. The only wat to time these things is to use offset keys on the flywheel. Sometimes the flywheel key will shear and the flywheel will move and this changes the timing. I would almost bet that your problem is carb related and probably can be fixed by adjusting the hi speed jet.