Hello,
I could use some help because I am running out of idea's. I have a 503 with dual
Bing 54 carb's. The engine starts and runs well up to about 2000 RPM. After
this RPM it has nothing left it just bogs. I have gone through both carbs so many
times I could do it in my sleep. I don't think it is fuel pump problem because
I have rebuilt it and I have used the primer bulb to try to compensate for
a potentially bad pump but this has no effect. The other day I ran it up to
a point just before it bogged and put three fingers in front of the inlet of
the right carb and got it to bog. I put three fingers in front of the inlet on
the left carb and got a 1000 RPM rise. The carb on the left is an older type
so I bought a brand new carb. Would you believe it? Same exact reaction. I went
through the timing but I will probably go through it again to double check.
Any body got any idea's? I have done so much that I can't even remember it all.
Ray W.
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