Engine runs lean, old Webra 61. Who can help?

[Urs Baertschiger]

Thanks again to all who offered help. - Due to poor weather and temperatures 
below freezing point I didn't do any test runs during the weekend. If 
weather conditions improve a bit I shall try in the course of this week.

Dave: Sorry, forgot to mention that. The pipe was the very first thing I 
checked and I keep watching it. No clogging, no loose baffle. Compared it 
with a almost new Hatori original I can't notice any difference in back 
pressure.
Tank center line is about 1/2" above the needle valve. Hence I didn't supply 
pipe pressure to the tank thinking this wasn't necessary for test runs on 
the ground.
Lean idling and midrange due to worn brass bar/sleeve are known as you 
mention it, but so far I never noticed any impact on full throttle.
As I disassembled the carb I had checked the fuel metering slot very 
carefully. It is OK.
At present another Dynamix carb is fitted to the engine but, as stated 
before, the problem is exactly the same.


Del: Yes, I think you are right. There is definitely a feeding problem. I 
sure do what Tony suggested. A check indicated that the carb was and still 
is set up as he said.
Fuel lines are of max. diam. I can fit. - You don't sound insulting at all. 
I very much appreciate your comments.

Nedim: Thanks, good to know that the combination Dynamix carb and pipe 
pressure doesn't work. So I am not going to try that again. Also, since you 
experienced pump problems on these engines I certainly will wach and check 
the pump as you say. The only thing that amazes me a bit is the fact that in 
all these years past we never had a failing pump. Hence I'd never expected 
the pump to be a problem. But there again, it's been a long time ago and 
this engine hasn't been run for years in between.


Many thanks again and kind regards

Urs
NSRCA #3069

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