Webra Problem

[Lee Davis]

Check the high end mix on the ground.  If you can set it so the engine is
obviously too rich then you do not have a pump problem.  If you cannot, then
replace the pump diaphrams.  They can distort if the pump gets overheated
which is not uncommon.
 
If you have a lot of time on the engine you might be due for a rebuild.
Replace the rear bearing, con rod (it tends to get sloppy on the wrist pin)
and ring.  Assuming you have an AAR the sleeve will outlast several ring
replacements.
 
The 1.60's are cool and all, but the truth is a solid 1.45 will yank an even
overweight pattern plane around like a toy.  IMO, stick with it.  If you
have a few bucks to spare buy it one of the mixture control carbs - sweet
setup.
 
Lee Davis
Piedmont Models

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
Behalf Of Randy
Sent: Wednesday, June 09, 2004 1:56 PM
To: discussion at nsrca.org
Subject: Webra Problem


My webra 145 with a normal carbo seems to be losing power on the up lines.
It seems to me that the pump should delive a near constant flow of fuel.  So
I should not need to have is real rich on the high end to handle the up
lines.  But still losing power on uplines, so have been richening it.
 
Low end seems fine.

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