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Mercruiser 470 no accelation when in gear ????????

 
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burkstar



Joined: 10 Apr 2011
Posts: 1

PostPosted: Sun Apr 10, 2011 3:44 am    Post subject: Mercruiser 470 no accelation when in gear ???????? Reply with quote

I have a Mercruiser 470 and it was fine, Ive had her out of the water all winter, just put her back in.
On the trailer she revs right through the rev range in gear or out of gear no problem at all but in the water out of gear again she is fine, revs right through the rev range no problem but in gear she wont and just dies.
I fact thats not totally true. She goes into gear and ticks over and runs fine c750 revs. At c1000 rev she just about runs but you start to get a slight backfire through the carb, at c1100 she back fires through the carb and dies.
At first I started with the basics, spark plugs, points etc all fine, ever borrowed a friends timing light (Snap on, the real thing) timing was out but now ajusted spot on but still does exactly the same thing.

Please help I am totally lost.
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MikeW
Senior Member


Joined: 01 May 2006
Posts: 680

PostPosted: Wed Apr 13, 2011 7:22 am    Post subject: Reply with quote

It sounds like the accelerator pump in the carburetor. When they are weak, the engine will stumble and stall when throttling up. Cool
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