Points or ducati ignition?
Check that there are no restrictions in your muffler. Had something similar
happen to me once & it was a big mud dobber nest in the muffler.
-----Original Message-----
From: owner-kolb-list-server@matronics.com
[mailto:owner-kolb-list-server@matronics.com] On Behalf Of rayw
Sent: Wednesday, November 18, 2009 6:18 PM
To: kolb-list@matronics.com
Subject: 503 Problem
Hello,
I could use some help. 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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http://forums.matronics.com/viewtopic.php?p=273634#273634
