660 not starting

corey

this is the secomd time this has happened. ill be using the 66, set it down for an hour or 2, go to use it again, and the darn thing wont fire. has to sit over night, then the exhaust pukes out tones of smoke for the first few seconds. i use the stihl oil mix and 93 octane fuel. i have only hade the saw for a few months.

bill24

Corey, , saws can be frustrating until you get them worked out, each can be a bit different.

I would first up make sure air cleaner is clean.

Run proper mixture petrol/oil.

Clean plug, not oiled or carboned up.

Mixture screws, sounds like its flooding, wind H (high speed)and L(low speed) mixture screws all the way down, clockwise. (Would note how many turn/part turn in, for interest)

Book says both should then be taken back out, anti clockwise, 1 full turn, or 360 degree turn of screwdriver.

(Saw could have small sign on it H.L then a circle with a '1' in it)

Don't lean off, or turn back down, the H mixture screw to far past speci's. won't do the motor any good at all.

The following has all STIHL manuals in it that can be read or downloaded/printed off.

My 066 is a reliable saw and handy to have, you will like the 660 when you get it sorted out.

Hope to have been of assistance.

regards, Bill24

STIHL Incorporated USA -- Information -- Manufacturing the World's Number One Selling Brand of Chain Saws

I think the address is OK, but will be locatable on there.

Juno

I hat the same problem.

I just used to must oil in de mixture. Now I use the Stihl motomix. and it runs fine.
Only thing it that I hat to replace was the (Bougie) I think you call it the plug.

good luck

bill24

Juno , must have had lots of smoke when running? good you got it sorted out.

Corey, is the saw doing this very often? Thinking may have loose particle of wood in fuel system holding open fuel regulation.

To get out of trouble when using, and it refuses to restart, turn off ignition on saw, ie button near throttle all the way up, pull out plug, is probably very wet with fuel, turn over motor a few times, will push out some excess fuel, clean and dry off plug and refit.

Restart with high throttle setting.......good luck.

At the end of it all, the saw is getting to much fuel into cylinder, sort out the reason and it will be fixed.

Plenty knowledgable blokes on this forum will know heaps more than me, it will get sorted out for sure.

stihl #1

The first thing to check is if the inlet needle is leaking. A small pressure tester is hooked to the carb in place of the fuel line and pumped to no more then 10 PSI and it should hold steady and not leak down. If it is not holding then fuel is seeping into the venturi and filling up the crankcase. It may be a minor leak that will not cause running problems from a cold start, but after running a while the whole saw is warm and the fuel in the tank has been shaken and the static pressure is higher, so that is when it floods the worst.

This is the only pic I had handy and it is a purge carb from a trimmer, but the test is the same. You don't have to take it off the saw, just drain the tank and then take the line off the carb and attach the tester. It could also be other things causing this problem but this is the first test I would do if it was on my bench.
HTH

Attached Thumbnails

 

Eric Frei

Great advice.

Here's a trick I also use for badly flooded saws.

Take out the plug, get your blower out, and blast the living crap outta that plug hole with air while very slowly cranking the engine over so all fuel gets evaporated.

__________________

newguy18

I've done a similar trick but i adise against my method unless you knw exactly what yuor doing,use a bernz o matic torch with a low flame to "burn off" the cylinder.No this will not damage engine parts but you need to be careful and do not stuff the tip in the cylinder,hold it back about an inch so just the flame goes in.

__________________
Have your say join us today.


old schooler

RandyMac

Are we being nuked?

no, it's just Bill clearing a flooded chainsaw.

__________________
RandyMac

newguy18

Lol Randy,i also said i advise not doing it that way unless you know exactly what you are doing.A better way is to remove the plug and pull a few times on the rope to get the excess fuel out and beat the plug in the palm of your hand.

__________________
Have your say join us today.


old schooler

aphid

to clear out a badly flooded saw i remove the spark plug and leaving the ignition switch off i turn the saw upside down and pull the cord with the throttle held wide open several times. flip back over wipe up raw gas, put sparkplug into the wire boot and lay the sparkplug over the threaded hole. with the ignition switch on throttle open pull cord igniting the remaning gas and drying the plug, repeating till the feul no longer burns. put back together. does the 66 have a spark arrester that maybe clogged with carbon?

TrevMcRev

Or just go to shop for some lunch and a coffee

This usually fixes it

Al H.

As Stihl#1 said but if you do not have a pressure tester, release the fuel cap the moment you stop the saw, or is the flood due to starting methods used to try and restart ie: using choke and heaps of pulls?


Al.