Saw nearly impossible to start when cold!

[Chris Sheppard]

#

 

Erm - compression is always more on a cold engine due to the fuel/oil coating covering the piston and cylinder being thicker when cold and more liquid when warm.

 

I knew that - honest

[spudulike]

I knew that - honest

 

Will let you off this time:001_rolleyes:

 

- You can get saws starting ok but being a pig when hot due to the compression dropping off when hot

 

Back to the problem - try giving it three pulls on full choke and then get someone to hold the throttle open whilst you pull the starter to see if it goes - the choke lever has a full choke position and then a fast idle position, if this "fast idle" position isnt holding the throttle open, the saw will be a pig to fire - had a 80cc 181 Husqvarna like that and it almost killed me - great workout though!

[samthescam]

Thanks guys. Sadly the L screw isnt solving the problem. Seem's like it might be time to condemn this little old saw. It's a shame cos when it does start it's more that good enough to do what I need...

 

Spudulike - i'll give your idea a shot tomorrow and see if it works. Did ask at local dealer about cost of them looking at it and service etc... about the £80 mark for a saw that's newer replacement can be purchased for £250... No chance in hell with the chain and bar it's got on it.

[Chris Sheppard]

Will let you off this time:001_rolleyes:

 

 

 

In my defence, we once had an old YZ125 that would never kick from cold, but would go with a good long tow - but once warm would start fine all day. That got re-ringed and seemed to cure it.

[spudulike]

 

In my defence, we once had an old YZ125 that would never kick from cold, but would go with a good long tow - but once warm would start fine all day. That got re-ringed and seemed to cure it.

 

A warm or hot engine vapourises the fuel/oil mix and the engine likes vapour and not fluid so a warm engine will tend to start easier than cold. One old trick was to warm the spark plug with a gas torch - a neighbour had trouble with a wacker plate he had hired once - couldn't get it going, told him that tip and wish I hadn't:lol:

 

Always exceptions to the rule but there are always base facts that are correct most of the time.

 

One last tip on the dodgy saw - check the impulse line is good, on a cold start there is a possibillity it isn't pulling enough fuel through - just a thought!

If you are going to throw it - you can throw it in my direction:thumbup: