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lawn mower would not start. drained and replaced fuel checked lines ok. replaced spark plug. stripped and cleaned carb. now starting but not running at full power sounds like it is missing / running lumpy. lawn mower has only done at most 1 hour of cutting I have a small garden and only used couple of time everything looks clean and clear. engine does pick up if I manually pull back the automatic choke

Is warranty repair available?

only come with one year ive had it 18 months

What make/model of mower and engine?

All product brought into the uk comes with a 2 year manufactured warranty subject to t & c's.

Re-clean the carb and make sure the seals (gaskets) are good, it sounds like a carb problem.

it was bought from B&Q no make listed any where just FPPM35 model and same with engine no make just DG350 model and it has a keruidi auto choke carb fitted

I had problems with it last year after leaving fuel in it and went to B&Q they said it had 12 months cover and leave fuel in wasn't covered so I payed to have it stripped and clean by there authorised dealer.
but I still don't think it was running right then because it seemed to cut out easily but never thought much of it at the time.

done same again this year left fuel in over winter left it in for next time but next time never came.

like I said it would not start give it a good clean or as best as I could I also replaced the gaskets due to them getting fuel on them. but im not sure about adjustments on carb because if I pull on the auto choke a bit it runs good so I think its something needs adjusting just not sure where to start

If it runs good with the choke on then the fuel is restricted either leading into the carb or the carb itself. Like EngineMan has suggested I would also reclean carb.

Yes but this carb is immaculate its only done max of 1 hour and i gave a good clean with carb cleaner and getting through all jets

frankieboyuk said:

Yes but this carb is immaculate its only done max of 1 hour and i gave a good clean with carb cleaner and getting through all jets

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Post up what engine it is (number and type) if you are happy with the cleaning of the carb then check the fuel lines and tank, if it is working with the choke on or just open then you have too much air to fuel.

EngineMan said:

Post up what engine it is (number and type) if you are happy with the cleaning of the carb then check the fuel lines and tank, if it is working with the choke on or just open then you have too much air to fuel.

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right i've gave the carb another good clean out made some adjustments on the carb checked all fuel lines (ok) fitted it back on gave it some good few primes and it started up fine and ran for about a minute no problem when it was cold the started to miss again once it warmed up now its running really bad again. so im thinking its got to be down to adjustments on the carb side of thing but I don't know what screws do what and not sure how would be best to set it up.
ive took some photos of the carb and the auto choke linkage and took a video of the lawnmower running which I think should load up on here first time trying that.
But as far as engine goes all I know is it a B&Q fppm35 mower with a 98,5cc dg350 engine fitted.

Looks like you are getting a lot of spitting out of the carb. Almost sounds like you are running rich not lean, which is the normal things with carbs. Lets start by checking the valve clearance, as well as the flywheel key to make sure it isn't partly sheared.

If those check out OK, the lets go back to the carb, and make sure the air bleed holes are clean. those are the holes just inside the intake side of the carb. Also pull that screw that goes down from the top of the carb, and make sure it is clean as well as the passages.

ILENGINE said:

Looks like you are getting a lot of spitting out of the carb. Almost sounds like you are running rich not lean, which is the normal things with carbs. Lets start by checking the valve clearance, as well as the flywheel key to make sure it isn't partly sheared.

If those check out OK, the lets go back to the carb, and make sure the air bleed holes are clean. those are the holes just inside the intake side of the carb. Also pull that screw that goes down from the top of the carb, and make sure it is clean as well as the passages.

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ok not sure what a flywheel key is and don't think there will be anything wrong with valve clearance giving low running time and the fact it ran perfect for first 60secs or so all the holes r clear im just not sure what adjustments to do on the card as far as air fuel mixture

ILENGINE has got a point, it could be the intake valve may not be seating as tightly has it should, which will blow the fuel out of the carb, it also looks that way on your video. give the engine a compression test.

EngineMan said:

ILENGINE has got a point, it could be the intake valve may not be seating as tightly has it should, which will blow the fuel out of the carb, it also looks that way on your video. give the engine a compression test.

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yes it was definitely blowing fuel out the carb so I will try compression test on it tomorrow but what readings should I be getting?

I like to see at least 90 psi on most engines but anything under about 70 psi would be suspect.