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Husqvarna 240R Brushcutter
I recently aquired the above brushcutter and although it was initially
running well, it will no longer start. A few times it has been running ok and then stopped fairly abruptly, maybe after 30 mins use or so ! Having removed the fuel filter (end of the fuel line in the tank) it is now getting fuel (The plug is getting wet). It seemed to be quite dry prviously, although it must have been getting some fuel or it wouldnt have run at all. The filter seems to be some sort of porous substance that allows fuel to "seep" through. The plug sparks fine and even runs in my Mountfield lawnmower. I've set the "L" screw to 1 1/4 turns out and the "H" to 1 turn as prescribed by my local repairer, but still no joy ! Albeit maybe 3 in 300 pulls, it has tried to catch but not fully. After this the cylinder is quite hot to the touch, so there is evidently something going on. The repair agent spoke of an impulse vent/port/something that may be blocked between the carb and inlet. Anyone any idea ? Beyond that I may have to resort to taking it to the Brushcutter Dr but would prefer to make an attempt at fixing myself first ! Anyone feel they can help me ? |
#3
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Husqvarna 240R Brushcutter
"Simon Avery" wrote in message ... (Col Forsyth) wrote: Aha! A *proper* strimmer! I got two. (One for work, one for home) One of them recently exhibited similar problems. It's Ok to start, but won't idle and cuts out when you lift the head. But I think both our problems are related - fuel supply. The end of the porcelain should be a "light biscuit brown". This could be down to air or fuel blockage (likely) or tuning. Yep, plug is/was a light biscuit brown. Bit damp now from excessive attempts at starting. Remove engine cover. Wash it in a bowl of soapy water. Close choke, remove air filter. Wash in soapy water and dry. This is about the only thing I havent done. Remove the four allen keys that hold the start cord assembly on. Remove. Clean this thoroughly AND the fan inside the engine too. Can get very dirty as this is the first place muck meets when it's sucked over the engine. Wash the assembly in soapy water and dry. Also clean the two dogs on the assembly carefully and give them a light grease. When refitting - introduce gently and pull the cord slowly until you hear the dogs "click" into position - too rough and they can snap off. Yep, had all this off and cleaned everything. Had the pickup off and refitted with the 10 thou clearance to the magnets as suggested by repai man. Now retry with the cover off (but air filter in place) - keeping your hands away from the spark plug and HT circuit. It may run sluggish a few seconds if the air filter is still damp, but will clear quickly. Nope, no such luck ! You've removed the fuel filter (bad idea for a long period, btw). They can be replaced cheaply and worth doing anyway. Another thing is to remove the fuel line from the carb and blow down it to ensure it's not blocked. Fuel lines can perish and collapse, or get pinched in the case - the only way to check is to suck through it - but ensure fuel tank's dry first... With the filter ON and the fuel cap FITTED I blew down the pipe and hey presto a fountain, so I guess the filter is ok ! If it runs for a bit then cuts out, try freeing the fuel cap. The breather section in the middle can block sometimes causing a vacuum - you'll hear a small hiss if this is the case. Thought about that, but no such luck. Been slackening it every dozen or so pulls. If all *that* fails, the next step would be to take the carby apart and clean it - but that can be very fiddly and might be worth leaving to your expert. It's possibly the diaphragm has a puncture which will make it run very lean. Had the carb off, gave it a good blow thru. Nothing obvious. Diaphram in good condition as was the rubber tip on the main needle. Also discovered the breather thru into the inlet that he spoke of, seemed fine. HTH, any probs just ask. -- Simon Avery, Dartmoor, UK Ý http://www.digdilem.org/ Guess its gonna have to be a trip to Dr Huskie ! However, thanks very much for the extensive reply. I'll let you know what fixes it !!! Col |
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