saw suddenly won't start

[spudulike]

The thing with a flooded 2stroke is that it does not just dry out like a 4stroke

Sure, the fuel in the combustion chamber evaporates slowly, but it leaves behind an oil residue.

 

So you clean the plug and blow out the pot, but then you pull it over again and it pulls through more petrol from the flooded crankcase. This is very rich in oil too, so it oils the plug straight up. You may need to clean the plug several times.

 

These things can stay flooded for days after the first failed start.

 

Keep the choke off, open the throttle and keep pulling for all you are worth. Eventually it will cough once, then twice, then three times. Then it might run and chuck out clouds of smoke.

 

Keep it going until the exhaust is clear and the engine note is sweet.

 

Best done outside eh Barrie:blushing:

[GardenKit]

Best done outside eh Barrie:blushing:

Yup, plenty of fresh air.

 

I get about one a week brought in because it wont start, that proves to be flooded.

 

Usually Stihl MS 180 types.

 

Got one started this way last month, told the customer it needed a bit more work because it would not tick over, but he wanted to use it straight away.

 

"Will I be able to start it" he asks

"Possibly, but it needs a little work"

"I'll do the job and bring it back later" he says. "Can you wind up the tickover and start it?" "Leave it running and I will take it home in the boot and use it straight away"

 

He was offended when I hit the stop switch before handing it back!

[spudulike]

Yup, plenty of fresh air.

 

I get about one a week brought in because it wont start, that proves to be flooded.

 

Usually Stihl MS 180 types.

 

Got one started this way last month, told the customer it needed a bit more work because it would not tick over, but he wanted to use it straight away.

 

"Will I be able to start it" he asks

"Possibly, but it needs a little work"

"I'll do the job and bring it back later" he says. "Can you wind up the tickover and start it?" "Leave it running and I will take it home in the boot and use it straight away"

 

He was offended when I hit the stop switch before handing it back!

 

Now that story is as good as mine about a fellow villager asking me to sharpen his chain - I looked at it and said "what should I sharpen, there are no cutters left on it" he just looked a little hurt:001_rolleyes:

 

I love the general public:lol:

[travis]

thanks guys, i will look again tomorrow. how do i check the needle valve and fix it ?

[adw]

The amount of fuel your talking about i would say has to be the needle valve in the carb leaking, the only real test is to pressure test the carb with a small bulb tester, this will tell you straight away if the needle is leaking, there is no need to remove the carb, pull the fuel hose out throught the filler, remove the fuel filter, connect the tester to the hose, there is no permissible leak allowed, you only need approx 2/3 psi.

[travis]

ADW, thanks for that, what do i do if the needle valve is leaking ?

[slasherscot]

first thing you should do is change the spark plug.... a spare 1 or rob another saw just to check it out. u may get a spark off the 1 thats in your saw but it may not be enough.

[travis]

slasher, thanks. did that. it is a good idea to have a spare plug or two.

 

the saw is working again, i did as spud said; remove plug, pull starter a few times, heat the plug on the gas hob for a bit, bung it in and it started !

it was news to me that 2 strokes after they have flooded don't fix themselves :embarrassed face: what still remains is why, when this saw normally starts 1st pull on this occasion refuse to start? anyhow thanks again

ADW and Spud, i will investigate the needle valve.

[spudulike]

slasher, thanks. did that. it is a good idea to have a spare plug or two.

 

the saw is working again, i did as spud said; remove plug, pull starter a few times, heat the plug on the gas hob for a bit, bung it in and it started !

it was news to me that 2 strokes after they have flooded don't fix themselves :embarrassed face: what still remains is why, when this saw normally starts 1st pull on this occasion refuse to start? anyhow thanks again

ADW and Spud, i will investigate the needle valve.

 

I missed the end result - all good I see, sometimes you just miss the first pop of the engine and end up just pullig it over a few times too many:001_rolleyes:

 

Not the first time and won't be the last!