yam 4hp 4 stroke prob

[mike02380]

hello everyone

 

I have a problem with my aux, it starts (not very well) and ticksover but when i add some throttle it dies, I am running it in a bin full of water out of gear.

 

any suggestions please

Edited April 8, 2010 by mike02380

[pirky]

Hi Mike

 

Not a mechanic and not really sure but I had similar with the 2 stroke chainsaw and it was carb jets blocked.......jets very small and easily blocked. Those that know can sort it out quite easily. As soon as you throttle up the demand on the jets increases and they cannot respond.

Hope it is that simple and you get it sorted easily.

Dave

[Jim]

Sounds reasonable enough.

Shouldn't be too big a job to clean the carb out.

Try the net for instructions.

 

 

Jim

[Coddy]

Just a thought

 

Are you letting it warm up?

 

Is there a choke option on your motor?

 

Are you using FRESH fuel?

 

Is there fuel getting to the carb?

 

Doubt if carbs blocked on a 4-stroke but the filter may be blocked or partly

 

Is the tank vent open?

 

Try all the simple things first if it worked ok previously

 

Dave

Edited April 8, 2010 by Coddy

[Sinbad]

Hi Mike,

I had the same problem with a newish 2hp 4 stroke Yam. They said there was some poop in the jets..... and it gets in there due to topping up.

 

Ran in the tank OK, but then under load opening up the throttle more than 1/2 way and it would conk out ... very annoying....

 

Hope you get it sorted

 

Paul

[petesnr]

Try Fuel Set. It's a green liquid that keeps carbs clean and breaks up water. Quite expensive but only small quantities needed. I've used it for years every trip and had no fuel problems. Damn I shouldn't have said that--bound to get a problem next trip!

 

Peter

[Freddie]

I once a similar problem and when I switched to another tank it worked just fine.

(vent probs)

 

If you can, try and borrow another one if it is not a jet/carb problem as sometimes the tank does not vent properly as they get older. Is it an old tank? I actually broke mine I think by dropping it on the ground from the boat when I refilled it, the pipe inside to the bottom fell off.

 

I had to throw my old mettle tanks away and bought new 22l plastic ones. Am more careful now.

 

Just a thought.

 

Good luck anyway

 

 

[Brian]

Sounds like a dirty jet, has the motor been standing for a long time?

[mike02380]

thanks all, i am going to try cleaning the carb as that seems the general consensus, i will report back

- probably when the engine is in bits and i can't put it back together again

[mike02380]

i sprayed some butane into the carb to help flush it through whilst it was semi dis mantled, seemed to help and it also seems to run alot better on the external fuel tank rather then the internal so i will empty it and top up with fresh, i also think i will pop into bhg for a new fuel filter, totally stripping the carb was a bit beyond me and my gerber multi tool! i couldn't work out how to get the pin which holds the float and jets out so just sprayed the butane in.

 

at least its running and useable but i think long term further attention is required

 

would any engine wizards be prepared to show me the procedure for some beer / free trip out fishing?

 

cheers

Edited April 9, 2010 by mike02380