Thread: chainsaw hard to start when hot

Originally Posted by bobsreturn2003

talking to a 2/st mechanic the other day an dcomplainig how one of my saws started ok when i primed it cold ,then 1/2 pull to restart all day ! then need to prime next day whats the problem? could be your fuel breather is clogged up he said . checked it and it was covered in dust and oil cleaned it and back to starting easy again !perhaps this is worth a look if your saw is hard to start as fuel is drawn back from the carby ! cheers Bob

Good point. Sometimes the fuel tank vent valve may look OK but may still be blocked. One way to check this is when opening the fuel cap on refill immediately after use and listen for air hissing (vacuum) back into tank.

update well cleaning the fuel vent stopped the fuel draining from the carby and it now starts with a couple of pulls with choke , the times i have had to remove the aircleaner and pour fuel in to prime . are finished hooray

Where is this vent... is it in the cap?

Originally Posted by Cliff Rogers

Where is this vent... is it in the cap?

Sometimes, on others it's on top LHS of tank.

In my little echo 51cc is on a tube near the carby facing upwards , so it catches sawdust and chokes up , has a rubber non return valve in it . Now if i could find out why my chainsaw leaks oil , my happiness would be complete cheers bob

Originally Posted by BobL

Sometimes, on others it's on top LHS of tank.

Ta, I'll look for it, I have a couple of Huskys.

Originally Posted by bobsreturn2003

... . Now if i could find out why my chainsaw leaks oil , ....

There at a few British Motor bike/car/4wd/truck/bus manufacturers who would also like to know that secret.

Originally Posted by bobsreturn2003

. . . . Now if i could find out why my chainsaw leaks oil , my happiness would be complete cheers bob

Most saws leak oil because the oil tank vent valve is blocked or not working right. On some saws this valve is a small ally slug and can be removed by knocking it into the oil tank and then retrieving it from there. Sometimes they can be unblocked by soaking/washing in raw petrol and blowing out with a compressor but usually it's hard work fixing and a replacement is the easiest way to go as the only cost a few $.

yep its the echo again will hunt up that vent . sure makes a mess in the cab when it leaks . very nice little saw though . thanks Bobl have a stihl c/s and no id on it is there anyway to get an id on it? looks about 70- 80cc not an 066 but near the same size .any ideas cheers Bob

Originally Posted by bobsreturn2003

yep its the echo again will hunt up that vent . sure makes a mess in the cab when it leaks . very nice little saw though . thanks Bobl have a stihl c/s and no id on it is there anyway to get an id on it? looks about 70- 80cc not an 066 but near the same size .any ideas cheers Bob

Post a pic or look here. Chain Saw Collectors Corner - Gasoline Chain Saws by Manufacturer

Hi Bob ,
My chain saw was only new and only used a few times and I had trouble starting it . I use 2 stroke boat oil in with the fuel and don't have any trouble starting the chain saw now . I even use it in my mower and whipper snipper and they start every time . I have a lot of friends that use it now . I hope that helps .
Regard Graham .

Originally Posted by Matador

Hi Bob ,
My chain saw was only new and only used a few times and I had trouble starting it . I use 2 stroke boat oil in with the fuel and don't have any trouble starting the chain saw now . I even use it in my mower and whipper snipper and they start every time . I have a lot of friends that use it now . I hope that helps .
Regard Graham .

Depending on what sort of air cooled engines you have, 2-stroke lube made for water cooled engines is not recommended for use in air cooled engines. It's probably OK in mowers and whipper snippers which have relatively little load on them but chain saws operate at high rpm under significant load and requires an oil that can offer the best protection possible and that is why there is special oils for such engines.

It's probably also OK on cheap small saws used for a bit of trimming and firewood but I would not use that lube on any sort of milling saw.

Originally Posted by BobL

Depending on what sort of air cooled engines you have, 2-stroke lube made for water cooled engines is not recommended for use in air cooled engines. It's probably OK in mowers and whipper snippers which have relatively little load on them but chain saws operate at high rpm under significant load and requires an oil that can offer the best protection possible and that is why there is special oils for such engines.

It's probably also OK on cheap small saws used for a bit of trimming and firewood but I would not use that lube on any sort of milling saw.

Yes, I probably wouldn't do that. Motorbike 2-stroke and Outboard 2-stroke are different formulations I understand. I use Echo oil in the Echo and Stihl oil in the others including the brushcutter. Keep the mix fresh and there should be no problem at all.