Stihl 045 AV Electronic Starting Problem

[Fredward]

Well I decided to give the old ignition one more chance.. After putting it back in and giving myself an electric shock I decided the spark wasn't 'so bad'. I swapped over the needle and diaphragms etc from the carb of the 041 just to see what happened and to my surprise it started up.. It is very tempremental and sometimes starts/sometimes doesn't even try.

When it runs it sounds like it's missing/jumping around all over the place, it's just not smooth and nothing like any saw I've run before. I thought it might be the timing, but I marked it (as best I could) when I took it off; plus it ran the same when I managed to get it going before I took off the igniton.. It doesn't idle and dies as soon as I let off the throttle.. And as for getting it started again afterwards - well it doesn't like to play ball.

At least it goes; sort of..

 

[Fredward]

Just a quick question - I bought a rebuild kit ' TILLOTSON REPAIR KIT RK-21HS ', it had a new lever which had the groove, the same as my last one, but the siver disk on the metering diaphragm didn't have a groove in the button. Does this matter?

 

[Rubber duck]

Hi from New Zealand,

A friend asked me to take a look at his 045 which someone gave him - all I was told is that he had it running briefly at some stage, it just spluttered and died. I'm have some experience with small engines, but I'm a bit stuck.. I checked that it had spark, noticed that quite a bit of fuel would pour out the back of the carb when I had the air filter off.. Took off the exhaust too see if it was clean and cear, had a little look at the piston which looked o.k.. I haven't got a compression tester but feels like there is plenty, hard work on the shoulders!.. It seemed like 'some' fuel was making it in to the cylinder, the plug was coming out with a bit of fuel on after trying to start, there was a strong smel of fuel but mainly what spilled out the bacl. I put a little fuel in to the cylinder through the plug bore and she started up with a bit of throttle and ran for about 10 or so seconds.

I wound in the H/L screws on the carbie and set them to the specifications I found in the manual. It still wouldn't start.. I'm guessing the fuel is making it to the carb but seems like a lot of it is coming back out. I took the carb and tank off.. Checked the rubber intake hose and the impulse hose which both look okay.. So I hooked out the tank hose, the filter looked clean (I don't know what else to do to it?!). I've taken the carb off but don't know where to go from here.. I'm scared of all those little parts and don't know what I'm looking for! I've got the parts list and manual so just need a little straight forward information on what I'm looking for..

I own a small Echo with an 18" bar but would love to buy the Stihl off him and get it going! More than that would just be great to see it running again

I do a full rebuild refurbish on it for you I have a stihl repair service on ebay were I fo a full rebuild from ground up professionally clean every single part on saw when I get done will run better than when was new my work speaks for its self

Hi from New Zealand,

A friend asked me to take a look at his 045 which someone gave him - all I was told is that he had it running briefly at some stage, it just spluttered and died. I'm have some experience with small engines, but I'm a bit stuck.. I checked that it had spark, noticed that quite a bit of fuel would pour out the back of the carb when I had the air filter off.. Took off the exhaust too see if it was clean and cear, had a little look at the piston which looked o.k.. I haven't got a compression tester but feels like there is plenty, hard work on the shoulders!.. It seemed like 'some' fuel was making it in to the cylinder, the plug was coming out with a bit of fuel on after trying to start, there was a strong smel of fuel but mainly what spilled out the bacl. I put a little fuel in to the cylinder through the plug bore and she started up with a bit of throttle and ran for about 10 or so seconds.

I wound in the H/L screws on the carbie and set them to the specifications I found in the manual. It still wouldn't start.. I'm guessing the fuel is making it to the carb but seems like a lot of it is coming back out. I took the carb and tank off.. Checked the rubber intake hose and the impulse hose which both look okay.. So I hooked out the tank hose, the filter looked clean (I don't know what else to do to it?!). I've taken the carb off but don't know where to go from here.. I'm scared of all those little parts and don't know what I'm looking for! I've got the parts list and manual so just need a little straight forward information on what I'm looking for..

I own a small Echo with an 18" bar but would love to buy the Stihl off him and get it going! More than that would just be great to see it running again

c

 

[Rubber duck]

Hi from New Zealand,

A friend asked me to take a look at his 045 which someone gave him - all I was told is that he had it running briefly at some stage, it just spluttered and died. I'm have some experience with small engines, but I'm a bit stuck.. I checked that it had spark, noticed that quite a bit of fuel would pour out the back of the carb when I had the air filter off.. Took off the exhaust too see if it was clean and cear, had a little look at the piston which looked o.k.. I haven't got a compression tester but feels like there is plenty, hard work on the shoulders!.. It seemed like 'some' fuel was making it in to the cylinder, the plug was coming out with a bit of fuel on after trying to start, there was a strong smel of fuel but mainly what spilled out the bacl. I put a little fuel in to the cylinder through the plug bore and she started up with a bit of throttle and ran for about 10 or so seconds.

I wound in the H/L screws on the carbie and set them to the specifications I found in the manual. It still wouldn't start.. I'm guessing the fuel is making it to the carb but seems like a lot of it is coming back out. I took the carb and tank off.. Checked the rubber intake hose and the impulse hose which both look okay.. So I hooked out the tank hose, the filter looked clean (I don't know what else to do to it?!). I've taken the carb off but don't know where to go from here.. I'm scared of all those little parts and don't know what I'm looking for! I've got the parts list and manual so just need a little straight forward information on what I'm looking for..

I own a small Echo with an 18" bar but would love to buy the Stihl off him and get it going! More than that would just be great to see it running again

I do a full rebuild refurbish on it for you I have a stihl repair service on ebay were I fo a full rebuild from ground up professionally clean every single part on saw when I get done will run better than when was new my work speaks for its self

Appologies for dredging this thread but I'm not making much progress with this saw so thought I'd update and see if anyone can help..

So after checking the carb/spark/fuel and coming to the end of my thether, I phoned my local Stihl dealer and asked if he could do a leakdown test. I explained to him what I'd done and he was sceptical that it would need a pressure test and told me to put it back together and bring it in. I did so, and funnily enough - before I took it in, it ran for maybe 4 seconds, the first time without having to put fuel in the bore. Needless to say I couldn't get it to fire again so I took it in and he proceeded to re-cover all of my work (he was a nice enough about it and let me come in the shop and watch him go over it.) I'd already had the saw on a spark tester at another shop, as a result he said there was 'enough' spark - although it's hard to see in daylight, but he reconfirmed there was spark in his darkroom (thought they'd have a tester at a Stihl dealer?!). Put a new plug in for good measure. He went over the carb and cleaned it AGAIN, he said the diaphrams were good and put it back together.

He eventually did a leakdown test and it held pressure. Weirdly enough after looking again (I'd already taken it off and checked it), we'd missed a split in the impulse hose. He couldn't get hold of the exact same one but we found one very similar just maybe 1.5cm longer. I replaced this but the saw still doesn't start. When he was looking it over he noticed a tiny bit of brown marking on the piston on the exhaust side - so I took the jug off and checked it today. There is no 'scoring', just burn marks as such, the piston and jug are pretty mint, no vertical play in the piston and rod. The only nastyness is a bit of carbon deposit on the top of the piston.

I'm waiting for a gasket before I put the cylinder back on - if anyone can think of something stupid why this thing will only fire up on rare occassions, I'm open to any suggestions. I couldn't get it to go at all with the new impulse hose on, not even when I put some fuel in the bore. I can post pictures of things if it's any help. I'm still not confident of the spark, even though it's there it doesn't seem bright...

Still very determined to get this thing going, parts are very expensive over here which is why I'm reluctant to throw in a carb kit.

Probably the stop switch is stuck on stop and shorting it out bad for white to break were it comes out of ignition send it to me will rebuild it right 40 years experience I am on ebay Cisco I am Rubber duck on here.