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Mend > Gardening

Question - mend, repair, fix

my Flymo maxitrim 430 won't start?

my Flymo maxitrim 430 won't start there is fuel in it & it has a spark



marcus
April 2011


Need to mend your Flymo gardening?

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1. Try taking out spark plug to see if it sparks, the spark is week so put your finger on it while pulling the cord slowly, if you feel it then that's that if not spray some carb and throttle cleaner down where the on off switch is to get a better connection to the body of the machine, I took mine apart to clean it with wire wool, make sure the plug is in good condition and the gap is correct, the coil is magnetised that generates the spark so could be worn out you can replace it easy enough.

That's the spark sorted now down to the fuel,

Petrol degrades when left for long periods so best to drain old fuel out of the machine and make sure the mixture is correct when adding fresh fuel.

The air filter can become blocked so take it out and clean with an airline or a Hoover then spray some carb/throttle cleaner down the opening its an awesome cleaner.

On first starting take out the spark plug crank the engine a few time to get the fuel going then warm the plug on the cooker or use a blow lamp this will help to ignite the fuel, you could even spray carb cleaner down into the air filter when cranking the engine,carburettors are sensitive to any alterations so if you have to replace parts then you may have to do some fine tuning, the carb cleaner will help in most cases, these engines are not fuel injected so every thing has to be perfect for them to run, last thing these engines have to have correct air/fuel mixture so check air adjustment screw is not to far in or out,
Hope that helps,

Chris
July 2016

1. Try taking out spark plug to see if it sparks, the spark is week so put your finger on it while pulling the cord slowly, if you feel it then that's that if not spray some carb and throttle cleaner down where the on off switch is to get a better connection to the body of the machine, I took mine apart to clean it with wire wool, make sure the plug is in good condition and the gap is correct, the coil is magnetised that generates the spark so could be worn out you can replace it easy enough.

That's the spark sorted now down to the fuel,

Petrol degrades when left for long periods so best to drain old fuel out of the machine and make sure the mixture is correct when adding fresh fuel.

The air filter can become blocked so take it out and clean with an airline or a Hoover then spray some carb/throttle cleaner down the opening its an awesome cleaner.

On first starting take out the spark plug crank the engine a few time to get the fuel going then warm the plug on the cooker or use a blow lamp this will help to ignite the fuel, you could even spray carb cleaner down into the air filter when cranking the engine,carburettors are sensitive to any alterations so if you have to replace parts then you may have to do some fine tuning, the carb cleaner will help in most cases, these engines are not fuel injected so every thing has to be perfect for them to run, last thing these engines have to have correct air/fuel mixture so check air adjustment screw is not to far in or out,
Hope that helps,

Chris
July 2016

Hi Gordon - how does one replace the fuel line?

Phil
July 2013

Hi Marcus, Did you ever get your Flymo going? Mine is driving me up the wall and the spares especially the diaphraghms are so expensive. And the postage charges are quite high considering the size of the diaphraghms.

Gordon
July 2011

Thanks for your reply, I wish there was white smoke coming out the back the only thing is it fires a couple of times and packs up. There is petrol on the spark plug but when you pull the starter the petrol tube appears to be empty or spasmodic flow even though I have put in new diaphraghms. By the way in my last note I said I put in a new carb, I meant carb gasket.

Gordon.
July 2011

I have the same problem I replaced the fuel line, filter pump diaphraghm, metering diaphraghm, spark plug and carberettor but it still wont start properly. it fires now and again but It dont run for long, any ideas please. I think I have mullered my shoulder trying to start it Ha Ha.

Gordon
July 2011

you might of flooded it, try pulling the cord with the mower turned off" to dry the spark plug out, you,keep pulling the cord till the white smoke has gone, and then turn it on and try it, if that dont work , take out the spark and put 3 tee spones of fule into the spark plug hole and hen put the spark plug back and then try it,

h
April 2011

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