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 Recoil start slipping on chainsaw - MAC 10-10A - Pics added
jchewie1  [Member]
9/3/2009 9:09:19 PM
Hi,

I have a McCulloch 10-10A. Was made over 30 years ago, and still runs and cuts great if a little loud.


Problem is that the recoil spring started slipping when the starter rope is pulled.
I have had the starting mechanism apart several times, rewound the spring, put it all back together, and it will slip again.

Does anyone have any idea what I am doing wrong?

Do I need a new spring?


The outside of the coil is not slipping off the chainsaw housing, and the nub on the rope disk where the spring engages isn't worn or broken. With the plug out I can pull the starter rope out several times in quick succession without a problem. It only slips after about a half pull when there is compression.


Any ideas appreciated!

Thanks,
J.
thebeekeeper1  [Site Staff]
9/3/2009 9:37:05 PM
The teeth on the gear are worn. I doubt if you can get parts . . .
tothemax  [Team Member]
9/7/2009 10:00:54 AM
most of those recoil starters have a set of metal/plastic dogs that spin out and engage the flywheel when you pull on the rope. when you let go of the rope a spring pulls the dogs back in and disengages them. i would take that starter assembly off again and make sure there not gummed up. also make sure they are in good shape and not tore up. you can also look at the flyhweel because some saws have the dogs on it.

if you wish take a picture of the starter assembly and flywheel and post them for us. ill tag this thread and come back to it.
jchewie1  [Member]
9/8/2009 8:24:12 PM
Thanks for the replies guys. I've got some pictures:


A pull start leaves the rope halfway out like this.



View of the starter clutch. I cleaned it out well. No difference in function. The dogs click right in to start and allow the hub to slip to tighten the rope as they should.



View of the spring with rope disk removed. The bore in the rope disk has two flats that engage the starter hub shaft solidly.



View with the spring set on the rope disk. Everything else appears in order, I can spin the starter hub shaft with my fingers in the wind up direction (CW as shown) at this point. If I take the spark plug out I can spin it in the crank direction by hand also.






I appreciate the help, if it's a spring I'll buy one and cut more firewood.
If it isn't a spring I don't want to throw good money at a 35 year old chainsaw.
tothemax  [Team Member]
9/8/2009 9:46:39 PM
if the pull start is staying out like that i would try rewinding the spring and re installing the cord. if it doesnt work still the spring might be broke or slipping. its hard to tell from the pics but try that.
jchewie1  [Member]
9/9/2009 5:59:54 AM
Originally Posted By tothemax:
if the pull start is staying out like that i would try rewinding the spring and re installing the cord. if it doesnt work still the spring might be broke or slipping. its hard to tell from the pics but try that.



Yep, I've tried rewinding the spring several times and that is typical of how it winds up after a pull or two with the spark plug installed.


Guess I'll order a new spring.
tothemax  [Team Member]
9/9/2009 8:56:12 AM
just look the spring over and make sure the ends have not broken off. also make sure you give the housing (where the spring rides) a good once over as well. it may be worn and not holding the spring where it should anymore.

look on ebay for parts too. a lot of guys part out saws and you can find them there cheap