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AQ211a will not idle and sounds terrible

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daddycool

New member
Hello to anyone that can help. I have a penta AQ211a engine that sounded nice when tested on my trailer for less than a minute to prevent overheat but still would only start by spraying fuel into the carb. When I put it in the water I found it still would not start unless fuel was sprayed in to the carb, once it got going it cut out straight away below 2000 revs, also the right hand exhaust manifold was blocked.
The manifold is now clear and i have good water flow and temps, i have changed the plugs, rotor arm, dis cap and set the points. There is a good spark but the problem of starting is still there and it never ticks over.
The engine will only start by spraying fuel into the carb and the throttle has to be wide open for it to fire, when it does start it sounds awful, really bad, and then as you lower revs it cuts out.
I would really appreciate any help of where to go from here as I am now really stuck.
 
Since your problem is fuel related, I would start with a carb overhaul. While you are at it might as well do a compression test, or bettyer yet a leak down test to determine the overall condition of your motor.

Have a great day

Rob
 
Just some simple tests.....Is the gas older than 3 mos? How old is the fuel water separator filter? Gas today loses octane rapidly. If the gas is old (over the winter) possibly there is excess water build up. You should chage oout your filters, use a high grade of throttle body cleaner sprayed in the carb. It may save you rebuilding the carb maybe not, worth a try. Add an octane booster to the gas and add some fresh gas. Better, if possible simply run the gas supply line directly to a can of new clean fuel.
Best of luck
Bertie
 
Thanks for your help I will start by getting the carb cleaned out, did compression test today 170psi in each chamber, I must mention though, the fuel is fresh, when she was launched again last week my wife put £100 worth of fuel in, not getting very far on it though Ha Ha, and the kids were cross with Dad for ruining their weekend!!!! So the sooner I solve this the better my life will be!!!!!! LOL
 
Thanks to all who helped, Carb cleaned engine running great again, Dads the hero. ( so my kids state)
Just a strong smell of exhaust fumes in engine bay from left side manifold, I assume manifold to head gasket worn, would I be correct?:D
 
That's one possibility. The other one is blow-by gases from the crankcase. Your engine should have one hose connected to each head cover on one side and to the carb flame arrestor on the other side. Make sure the hose connections are tight.
 
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