Why won't it start?

[Kernow Buoy]

Bought a used 30 hp yamaha on a Futura but couldn't get it to start. Great compression, good spark and nice clean plugs. Carb bowls drained, fresh fuel added and flushed through but still no go, drop of petrol added to top cylinder and briefly she fires, best open those carbs then. Oh !

[willk]

First move would be to open up your carbs in case they are horribly fouled up with gunk and corros...

Oh.

[Peter_C]

You "might" want to clean the fuel tank out, but that is up to you

To keep just that from happening I put a nice canister water/fuel separator on my transom.

[Hightower]

Looks like lithium based grease to me

[spartacus]

Originally Posted by Hightower

Looks like lithium based grease to me

Behave!

Take all the carbs off and soak them in diesel. You'll need to scrub the carbs with a tooth brush or similar. Go easy as you can end up damaging the rubber seals. You might be better buying a Yammie carb rebuild kit, not cheap though.

Clean the fuel bulb on the side of the engine and dispose of existing fuel.

Worst I've seen!

[Kernow Buoy]

Bad isn't it, to be fair it does look like someone's reached for the wrong can!
That was the worst carb (bottom one) the middle one was a bit better and the top one relatively OK, the amazing thing was that up until very recently that was running! Dare say my Opti or an Etec would cope with such abuse and still run
Had to destroy the needle valve to get it out it was that badly corroded and the main jet is soaking away overnight in the hope it'll come out tomorrow, I'll happily settle for a rebuild kit!

[matt h]

Originally Posted by Kernow Buoy

Bought a used 30 hp yamaha on a Futura but couldn't get it to start. Great compression, good spark and nice clean plugs. Carb bowls drained, fresh fuel added and flushed through but still no go, drop of petrol added to top cylinder and briefly she fires, best open those carbs then. Oh !

Looks like Whispers home brew petrol special mix!!

[Pedrode]

Originally Posted by spartacus

Behave! Take all the carbs off and soak them in diesel. You'll need to scrub the carbs with a tooth brush or similar. Go easy as you can end up damaging the rubber seals. You might be better buying a Yammie carb rebuild kit, not cheap though. Clean the fuel bulb on the side of the engine and dispose of existing fuel. Worst I've seen!

Ok, I was asking for that.

[Pedrode]

Originally Posted by Hightower

Looks like lithium based grease to me

And that

[Pedrode]

[QUOTE="Kernow Buoy;580390"]Bad isn't it, to be fair it does look like someone's reached for the wrong can! /QUOTE]

And that.

Just away to kick myself again....