husky 66 issue

[wannabemachinis]

had this saw since new,never been apart other than to replace some anti vibe mounts and a gas line. never had any drama with the machine at all!!!
went to start it and is really hard to pull start, like there is compression in two spots instead of one. can't pull it fast enough to fire it.( I don't think I am getting too old or weak) any way I have striped it down to the point I can see the crank bearings. there is nothing visible in the piston/cylinder that indicates damage. I am reluctant to condem the crank bearings as they feel OK when it is rotated by hand and no apparent looseness but I wonder if there is wear that shows up when the spark plug is installed as that is when it gets hard to pull. any body got an idea? saw has basically been used for firewood cutting so its usage is only seasonal

 

[motosierra]

Remove the sparkplug and then pull it a few times ans see if the condition continues.... if it does not continue ...put the plug back in and see what happens then..

 

[wannabemachinis]

thats the problem when I put the plug in it get so I can hardly pull start it. I swear it will break the starter cord if one keeps it up pulling it.

 

[mattinky]

I worked on a Stihl 031 recently with the same exact problem. With the spark plug out it turned over just fine, but with the plug in it was near impossible, tore it down and it was a crank bearing that was only binding up when it had compression against it. It was easy to spot once I had it apart, it had turned a tan color from heat and friction. Just my 2 cents, but it might give you something to look into....... Matt

 

[motosierra]

..do your bearings look discolored?

 

[motosierra]

how about adding a teaspoon of 2-cycle oil in the crankcase?...then pull the starter without the plug... then try it with the plug in place...

 

[Kenskip1]

Wannabeas, I have a sneaky suspision that you will need a new starting rope. What sounds like is that over the years the rope has weared. This is causing the rope to get wedged in a side by side manner when the compression cycle comes around.You are now fighting the compression as well as the rope as the rope will try and find anyway to sneak into the closest outlet. This is hard to explane but as the rope wears, it will get thinner in diamater. As it does this it will lay sideways inside the spool. Confused yet?When this does happen you will loose the mechanical leverage as the rope will be sitting inside the spool as well as lower therfore lowering your origional leverage gains. Sort of like starting your viechile in 3rd gear.
Another possible situation is your spool may have a small crack on one of it's sides. This will allow the same senaro as mentioned above.
I hope this helps, Ken

 

[Kenskip1]

Wannabe machinist,When I put my husky 55 together after the new ring was installed and my porting, unless I used the compression release I had the same problem.This is how I believe that this is your problem. I hope that a new starting rope will solve your problem. By the way, welcome to the forum. This place has everything that a man with a saw could ever use.Some of us can even make a fool out of our selves. best of luck, Ken

 

[motosierra]

That is certainly a very good possibility... the cord gets worn and wedges in the spool.

That is what is so great about this site...there are always people ready to help with very good ideas and solutions.

 

[HiOctane]

Kenskip is right,check your starter pulley ,problem is surely there .I still remember the part # 5015 207 01,even after few years not playing with them.

 

[wannabemachinis]

actually I had not given the starter rope a thought as it pulled freely when it was off the machine and also without plug in the cyl. It is the original anyway. This strikes me as one of those problems that so simple but can't see it because it is so simple

 

[wannabemachinis]

now I am PO'd as I put the 66 back together and guess what, it fired right up no problems what so ever, like it never happened. I had checked with a saw dealer who was not too interested in looking at my problem just told me it was cost prohibitive due to the age, fair enough but for two minutes of his time he might have at least looked at it. Went to the guy I really like to deal with as he had been away and his view was that it was fine. Checked the pull start also as he concurred that they had been problematic also. Anyhow put it back together today fired it up and cut up a tree. Guess its one of life's little mysterys that is meant to test us. Any way thanks to everyone who offered their help

 

[thomas72]

Look and see how much buildup of carbon is in the exhaust port, or a dirt dobber could have built a nest. Had the same problem with a C-51 Homelite and the exhaust ports were clogged with carbon. This may help if it happens again.