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Old 04 November 2013, 08:31   #1
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Why won't it start?

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 !
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Old 04 November 2013, 08:36   #2
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First move would be to open up your carbs in case they are horribly fouled up with gunk and corros...

Oh.

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Old 04 November 2013, 10:16   #3
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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.
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Old 04 November 2013, 14:41   #4
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Looks like lithium based grease to me
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Old 04 November 2013, 16:45   #5
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Quote:
Originally Posted by Hightower View Post
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!
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Old 04 November 2013, 17:24   #6
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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!
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Old 04 November 2013, 17:26   #7
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Quote:
Originally Posted by Kernow Buoy View Post
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!!
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Old 04 November 2013, 20:43   #8
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Originally Posted by spartacus View Post
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.
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Old 04 November 2013, 20:46   #9
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Looks like lithium based grease to me
And that
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Old 04 November 2013, 20:53   #10
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[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....
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