Makita 5200i starts then stops

[George]

My Makita 5200i doesn't get much use but has recently developed a starting problem.

 

It fires up ok but stops dead after a few seconds. I've cleaned the carb, filters and tank vent and replaced the diaphragms and the fuel pipe.

 

Problem still exists.

 

Any ideas?

[3dogs]

check the gap on the spark plug or just replace it.

[George]

Hi, thanks for quick reply. I forgot to mention but I also cleaned and reset plug gap.

 

Any other ideas - it's bound to be something simple?

 

Thanks

[Steve Bullman]

does it stop dead on tick over or die as you rev it up?

 

welcome to the forum by the way

[George]

Thanks for reply.

 

If left on tick-over it would conk out after about 5 seconds or so, and more quickly if revved up. It cuts out quickly as if there is some form of sudden fuel starvation.

 

Thanks

 

George

[Andy Collins]

have you adjusted the tick-over screw at any time, or moved the L or H screws at all?

[George]

Hi,

I hadn't touched either until I took the carb apart and on reassembly I followed the Tillotson recommendations of "OPEN HIGH SPEED MIXTURE SCREW AND IDLE MIXTURE SCREW ONE (1) TURN" before fine tuning after the engine had warmed up. (haven't got to that stage yet!!)

 

Also checked that exhaust wasn't blocked.

 

Baffling!!

 

George

[Charlieh]

does it take quite a few pulls before it starts? I would have the exhaust off it and see if the pistons scored,

[George]

Hi,

 

Bore look fine - like new.

 

It's always been a good starter, second pull normally, and even now after its been left for a while it fires up as quickly. The difference now is that during a "trying to find the problem" session the the time taken to fire up gets progressively longer as if fuel can't even get through quick enough for successive starting attempts.

 

G

[Charlieh]

compression test time I think, sounds like you have done everything else.