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503 Problems

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rayw

Joined: 18 Jul 2009
Posts: 25
Location: Wisconsin, Central

Posted: Wed Nov 18, 2009 3:09 pm Post subject: 503 Problems

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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