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Old 17 September 2014, 16:30   #11
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Check the pump
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Old 17 September 2014, 16:32   #12
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I will open it tomorrow and have a look. Anything in particular I have to look for in the pump?

Thanks.
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Old 17 September 2014, 17:04   #13
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On my old yam 40 it was a split diaphragm, which caused intermittent fuelling before it completely gave up. Be VERY careful when you open it, there's a spring that will pop out and remember how it goes back together! Also the gasket on mine tore easily but made a new one from cardboard & was fine.
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Old 18 September 2014, 07:45   #14
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jwatson, I opened the fuel pump, all seems fine, no splits etc... no spring in there tho, its the type that attaches to the carb.

A few more pictures and questions.

Peter C pointed out what looked like a piece of debris. As explained its the throttle plate (if thats what you call it) thats in the fully closed position. This seems strange as the other carb it closes fully. pics below.

Top carb in closed position - closes fully.



Bottom carb in fully closed position, theres a slight gap, should this be like this and if not in what position should it be, I noticed you turn the little screw on the side to adjust it.



I also pulled the plugs out, they are new but seems very dirty with particles on it, is that carbon? seems like some oil leaking from the top one. Also with them pulled out looking into the cylinder it appears theres a lot of the black build up inside the cylinder. Does anything here need attention and what does the plugs say in their state?



Where the plugs go in, cant see on the pic but seems very dirty inside looking in with a light.



Regards.
Chris.
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Old 18 September 2014, 13:08   #15
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When looking at spark plugs look at the center white part. They should be a nice tan color and yours are.

The carbs butterfly will not create a 100% seal and that is okay. It lets the air in that the motor needs to idle.

Time to blow all the passages out really well, then put it back together.

At this point if it is an older motor, I would just replace the fuel pump. Cheap insurance, and no fuel leaks from reusing a gasket.
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Old 19 September 2014, 16:47   #16
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Those plugs look like mine did before servicing. Oily.
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Old 19 September 2014, 19:30   #17
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Those carbs need synchronising together! And what oil ratio are you using?
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Old 20 September 2014, 02:18   #18
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Seafoam could help you out. Clean those plugs & give it a blast then check again.
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Old 20 September 2014, 14:43   #19
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Thanks for the replies guys...

Mattsleep - its autolube so no pre-mix.

Put all back together, no spare parts so all went back as it should. Started very easy and no choke required. Engine seems to have a much higher idle now, adjusted it a little on the idle screws but think the throttle needs slight adjustment too as theres not a huge difference in the low idle setting on the marking from below start to slow idle position.

Off to Loch Lomond in the morning to give it a good blast up and down the lake. Will report back.
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Old 20 September 2014, 14:45   #20
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I'd be tempted to try premix 50:1 and disconnect the automix for the day. Those plugs looked v oily.
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