Seagull engine

[michael1923]

I recently inherited an old seagull engine with clutch 5hp.

When i got it it wasn't running and was about to be thrown out from my mates shed, well i think seagulls are great and indestructable when running so decided to get it going.
After a bit of work i've got it running and although it is a bit hard to start (6 pulls ish) it does run without fear of conking out but is running strangely.

I use it as a back up engine at the moment, but the last time i was on the boat, i thought i'd start it up a run around abit with it.

Basically when running it and i have the throttle wide open, it will run fine for 2 mins then the revs drop right back to approx idle for 3 mins then back up high revs for 2 mins and so on.

I was wondering if anyone has any ideas what it could be.
I changed the HT lead, spark plug and cleaned and gapped the points when getting it to start. I am suspecting it is the carb but i'm not sure.
Any ideas, or have you had a similar problem.

Thanks Mike

[monkeynuts]

hi mike

iv had very simaler things happen b4 and its normal old fuel and dirty/sticky carb.

id clean out the tank , pipe from tank to carb then give the carb a good strip down ,clean out with white spirt and blow out with air,

cheers john

[michael1923]

Nice one, cheers John.
I'll give it a go.

[scotty]

as you say its most likely the carb.

[lighty]

Is the tank air supply retricted

[michael1923]

The tanks air is fine, i checked that. I think it's a blocked jet from being laid up, or maybe a float problem. When i'm over next i'll take the carb off and give it a clean.
If that doesn't work i'll post another question.

Mike