Ibeatgodzilla
ArboristSite Lurker
Hi all,
I'm normally pretty good with repairs, finding problems etc - but you never finish learning, and I am having trouble with an old Husvarna 44 at the moment.
Initially, the problem was no spark. The coils for these costing as much as the machines themselves are worth, I did a bit of research and found out that with a little filing, a 51/55 coil could be mounted.So I did buy and a fit a new one of them, and have got a good spark now.
However it still won't run. So, naturally, dismantle and clean out the carb, rebuild with full rebuilt kit. No difference whatsoever (!).
The cylinder floods with petrol like there's no tomorrow. I can put the mixture screws all the way in to the stops, pull the cord a few times, and it'll fire, rev for a second, then before I have a chance to react, die out again. Obvious thing to do; unscrew the screws a bit. Nope, won't start at all. Going by the spark plug the thing is just soaked in fuel. Every time I look at it to check, it's wet.
Definitely no air leak problem then, that's one good thing I guess.
Only thoughts are; either the valve inside the carb is staying open/not closing properly causing fuel to be delivered in permanence - however upon further disassembly of the carb I notice that the little aluminium 'dot' on the membrane that pushed on the valve lever is deeper on the aftermarket new membrane than the original. However swapping out to the original again yields no change, same issue. It does appear to be closing. I have tried carefully bending this lever to make it 'more closed' but again, no difference whatsoever when trying to start it.
Or, other possibility, I'm getting spark when testing the plug outside of the cylinder, touching against it, but not sparking properly when back inside the cylinder; or timing is wrong and it's sparking, but not when it should, so flooding - however timing is fixed by the flywheel, which I haven't removed. I saw on more than one post that a 51/55 coil with filed mounting holes fits - and works - in a 44; so in theory, why would this be the issue? And doesn't seem to answer the symptoms of it only firing briefly when mixture screws are in to the stops before flooding again.
I'm a bit stumped so if anybody has any ideas, thoughts, things for me to investigate I'm all ears. The coil wasn't exactly a great expense, but it more than anything it seems a shame to consider the saw scrap if it can be made running again - it seems so close.
Thanks in advance!
I'm normally pretty good with repairs, finding problems etc - but you never finish learning, and I am having trouble with an old Husvarna 44 at the moment.
Initially, the problem was no spark. The coils for these costing as much as the machines themselves are worth, I did a bit of research and found out that with a little filing, a 51/55 coil could be mounted.So I did buy and a fit a new one of them, and have got a good spark now.
However it still won't run. So, naturally, dismantle and clean out the carb, rebuild with full rebuilt kit. No difference whatsoever (!).
The cylinder floods with petrol like there's no tomorrow. I can put the mixture screws all the way in to the stops, pull the cord a few times, and it'll fire, rev for a second, then before I have a chance to react, die out again. Obvious thing to do; unscrew the screws a bit. Nope, won't start at all. Going by the spark plug the thing is just soaked in fuel. Every time I look at it to check, it's wet.
Definitely no air leak problem then, that's one good thing I guess.
Only thoughts are; either the valve inside the carb is staying open/not closing properly causing fuel to be delivered in permanence - however upon further disassembly of the carb I notice that the little aluminium 'dot' on the membrane that pushed on the valve lever is deeper on the aftermarket new membrane than the original. However swapping out to the original again yields no change, same issue. It does appear to be closing. I have tried carefully bending this lever to make it 'more closed' but again, no difference whatsoever when trying to start it.
Or, other possibility, I'm getting spark when testing the plug outside of the cylinder, touching against it, but not sparking properly when back inside the cylinder; or timing is wrong and it's sparking, but not when it should, so flooding - however timing is fixed by the flywheel, which I haven't removed. I saw on more than one post that a 51/55 coil with filed mounting holes fits - and works - in a 44; so in theory, why would this be the issue? And doesn't seem to answer the symptoms of it only firing briefly when mixture screws are in to the stops before flooding again.
I'm a bit stumped so if anybody has any ideas, thoughts, things for me to investigate I'm all ears. The coil wasn't exactly a great expense, but it more than anything it seems a shame to consider the saw scrap if it can be made running again - it seems so close.
Thanks in advance!