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Do you have a manual??? I sent you a PM... Manual shows to tighten clamp as jug is installed.

Post back in here after you get the 660 running. Of all the saws I have ran, that one is a bit different.

Neither have I, until I picked up the 660. A lot of compression there. It will rip the pull cord out of your hand. With the decomp it starts like a regular saw.

Pretty sure you need it. It has a lot of torque on the pull cord. If not, I have heard of the cord pulleys breaking even while using one. Even if you do not mind ringing your hand from the torque. My buddy works for the county and they have replaced a few of the pull cord pulleys on the Original...

BTW I dropped the trunk. My cousin cuts wood, but did not want to mess with the saw. After I dropped the trunk he looked over and said give me that....

What I read on here was 11 Ft Lbs. (Stihl manual) Seems pretty tight. I got mine to about 10 and got spooked. They turned, but did not want to get tighter. That is a LOT tighter than you can get by hand. You need a long torx driver to reach them. I did not have one (or could find one easy...

FYI, are you doing big mods to it?? (exhaust or new jug?) or just wanting to beef up the carburetor? I grabbed my carb out of the box and opened up the main jet just a few thousands. Since the idea was it ran lean out of the box. Nope. It ran very rich. I had to get a new carb. No going back...

I seen that on one package. The other packages did not list it. It also did not show on the PDF on their website under the specs. But good to go. I set it up and cranked it down tight. let it sit over night. I got a good hour run time on it already and holding great. I am thinking not tight...

I don't think the cylinder bolts had loctite. When removed I could not tell. The silver bolts did. The black ones that I have seen did not look like it. But it has been a while since I put it together. BTW The bottle of loctite I picked up said 10 minutes for partial set. 24 hours for full...

It took a couple hours for it to come loose on me... I guess I am getting gun shy and it can cause some damage if it loosens. Glad I caught it early... If I did...

Question on the loctite... If you put it on the bolts and put it together do you have to wait a while before you run the saw?? For the loctite to set? The instructions do not say. Normally no problem with automotive use. But the saws have a lot more vibrations. I never used the loctite primer.

Not sure if you add to this thread or start my own. I have some running time on my ms660 build. Ran great until today. Maybe an hour of use. Maybe more. It was running good, but noticed the muffler mounting bolts were loose. I retightened, it ran for a bit and died. Thinking I should have...

I built mine a couple months ago and it seems ok.... But I have not got to fire it up yet. I put a bar on it and it adjust well... I wonder when it gets polished in, if it gets more play in it.

You replied before I edited my post... I misread about replacing the parts. BTW I was wondering how the fuel lines hold up with the new gasoline. I found one place around that sells ethanol free fuel. I been buying my gasoline from them for all my small engines. Not far away and about the same...

I think he cut a bit of wood... finding the weak spots.

I think it has been that way for a while. I picked mine up at a black Friday special for about $200 with free shipping. I am not sure how often they run specials. I don't follow a lot but I thought I seen them for $200 and $100 shipping.

Like Bedford said, do a vac/pressure test. You do not want to run them lean with a vac leak. It will run hotter and do internal damage. I would use good fuel with synthetic oil. BTW there are a couple videos he posted a couple posts above that show how to do the test.

Mine seems to be ok. I was told when you install lube it up good and run it end to end a couple times to polish it in. It is installed with a bar, but I have not done any cutting yet.

Are you pulling a vacuum from 2 different areas (ports)? If so what areas? Thanks

The vacume drop looked about the same as what I saw in the videos. But I did not try turning the flywheel. That sounds like a good idea.