Stihl 064 wont start

[jasonbr]

Saw cut out today while ringing a large trunk. Saw was quite hot at this point. Would not start again. After much swearing packed up and came home. Checked plug and its sparking ok. Any ideas on what to do next or what may be wrong.

[johnanderton]

We had a 066 pack up the other year when one of the lads kept cutting till it ran out of fuel , it had some compression but did a ring .. Dick Leigh said never let saws run out esp big saws ... Not saying that's wot wrong with urs but just a idea !

[jasonbr]

Thanks for that. Saw had fuel in it. Tried everything tonight. Cleaned plug, coil, fly wheel. Seemed to have compression ok, so i thought it might be a fuel prob. Poured fuel down the shoot, still nothing. Scoured the forums and found someone saying to remove plug, turn upside down and give a couple of pulls. Did this, a little fuel or something dribbled out. Turned her round, popped the plug in, gave her a pull and she fired first time. Thank feck. Still none the wiser as to the root of this problem tho.

[Mesterh]

Had this prob with a 046(which started as an intermittent fault but got worse) and what it was was the diaphragm in the carb had blocked with crap and was forcing the inlet needle to lift off its seat a bit therefore flooding the engine.It was really bad though and fuel would pour out of the engine.

 

It is the metering diaphragm which relies on outside air pressure to do something so has a little hole in the metal retainer that clogs up.

 

I cant really explain which bit was causing the problem so I will look for a diagram and post it up.

[fraxinus]

if you have a similar sized magneto lying around from another saw, or can get one, bolt up and give it a try. fixed a mates 066 by doing that but the new one wasnt cheap.

 

if not then i would strip out the breather and flush it with brake cleaner. i have found that such a simple thing is a common problem with logging saws.

 

does it splutter or pop when it dies? and how long will it run before it stops?

[spudulike]

if you have a similar sized magneto lying around from another saw, or can get one, bolt up and give it a try. fixed a mates 066 by doing that but the new one wasnt cheap.

 

if not then i would strip out the breather and flush it with brake cleaner. i have found that such a simple thing is a common problem with logging saws.

 

does it splutter or pop when it dies? and how long will it run before it stops?

 

The OP has sorted his saw - "the turn it upside down trick to get rid of puddled fuel" worked - probably saw one of my earlier posts....possibly:thumbup:

 

Just for the record and am not trying to score points - chainsaws have flywheels and coils, a magneto is found on mopeds etc and is used for creating electricity to power the bikes lights and horn etc - something like a alternator on a car but formed around the flywheel.

 

A common mistake and misconception:blushing:

 

Welcome to the site by the way and hope the information is useful

[jasonbr]

Thanks everyone for your advice. Went to finish the job today. About four big rings left to cut. Saw cut out again after 2nd ring. When i pull starter there is no cough or splutter which makes me think its a fuel prob. However on completing the steps i did last night I got it to firer again. Saw seemed to want to cut out on idle too. I did this a further 3 times before i got job finished. I did notice on a couple of occassions when I removed the fuel pipe to the carb to see if there was fuel present that pipe seemed dry. Perhaps its not drawing petrol correctly?

[chazzer]

take the filter of on the line in the tank see if its makes any difference

[spudulike]

When you pull the pipe off the carb, generally the fuel pisses out everywhere, perhaps you have a blocked fuel filter or breather - the blocked breather would cause a vacuum in the tank and cause your problems.