Wierd problem at idle? Evinrude 6704M 6 HP

merc20076

Petty Officer 2nd Class
Joined
Sep 9, 2009
Messages
156
I have a wierd problem on this good Evinrude 6HP. Motor as a decent compression #'s on both cylinders (85). Carb was re-built with a new kit including a float. It fires well on both sparks and they are new also.

SInce I test the motor in a big trash can, if there's only water 2-3'' above cavitation plate, it won't idle well and stall easy. And when the water level is well above cavitation plate, it idles good but if I give more throttle it hesitate? Is it because of the pression or the smoke? The motor cover is off also when running in the can. Is this normal?

My 7.5HP runs very good in it even at full rpm but they have a air box...
 

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
Re: Wierd problem at idle? Evinrude 6704M 6 HP

Did you make sure the high speed orifice plug is absolutely, positively clean?

Any smoke inhallation at all will foul up the running. So will running in a barrel anyway. Are you revving those motors up in neutral? Bad.
 
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