4 stroke 70 OS
04-08-2003, 04:25 PM
#1
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Location: Naples FL
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4 stroke 70 OS
I have a OS 70 4 stroke that has been doing OK for a couple of years.
I have been using 15% Wildcat Ext.
I have checked the fuel lines and tank, and carb fittings.
I have tried a needle valve from another engine.
The engine runs pretty good with the needle valve screwed all the way in.
It does not seem to be running lean, and if I richen it does loose power.
I have other OS 4 stokes and they are fine.
Bing
I have been using 15% Wildcat Ext.
I have checked the fuel lines and tank, and carb fittings.
I have tried a needle valve from another engine.
The engine runs pretty good with the needle valve screwed all the way in.
It does not seem to be running lean, and if I richen it does loose power.
I have other OS 4 stokes and they are fine.
Bing
04-09-2003, 02:26 PM
#2
My Feedback: (11)
4 stroke 70 OS
It sounds like the needle seat in the carb body has been damaged. It's likely that you'll need to replace the carburetor body and the needle.
Take a look at the needle. Chances are that you'll find a polished area on the tapered point that shows where the needle has been possibly over-tightened at one time. That will expand the needle seat in the carb body.
Needles should never be tightened, just gently turned in until you feel them close.
Take a look at the needle. Chances are that you'll find a polished area on the tapered point that shows where the needle has been possibly over-tightened at one time. That will expand the needle seat in the carb body.
Needles should never be tightened, just gently turned in until you feel them close.
