Kirk,

Man, talk about a flashback, this thread was nearly four years ago!

I have several initial questions before I can give an informed opinion:

1. Is the engine new, or did someone before you run it?

2. If new, where did you get it and when was it initially purchased?

3. Have you made any adjustments to the pump?

4. Did it run better when it was newer, or has it always sagged on up lines (in other words, has it deteriorated)?

5. Have you, or anyone else, made any changes to the engine, for example replacing the bearings?

6. What fuel are you running in it?

7. Have you tried the low-end test from post #21? If so what was the result? "The low end normally needs adjusting. To do this let it idle at around 1900 to 2000 rpm if it keeps dying it's probably too lean (which normally isn't the case from the factory). Once you've got it successfully idling at 2K or so let it sit and idle for about 20 or 30 seconds then try revving it up. If it sputters and has trouble revving up then the low end is too rich. Reduce the low-end needle 1/8 turn at a time until you can go from idle to wide open without it sputtering. "

8. Another good test is to let it run at the mid-range (around 4500 to 5000 RPM) for about 45 seconds then go to full throttle. If it chokes and sputters this normally indicates that the high-end needle is too rich. If you've done this, what is the result?

If you can answer these questions it will be the first step towards solving your problem.

For the record, and with all due respect, I whole-heartedly disagree with Brian's comment about trashing the pump and using a Perry pump. I've run the Webra 1.45 for five or so years now in hot, cold and in between weather and there's absolutely no reason to use a third party pump. Once you get the motor tuned they run great with the standard pump.

Regarding M Austin's comment about inconsistent pump quality, and possibly why Brian feels as he does, there is some validity to this comment because one of my Webras did have a different pump membrane, which got brittle relatively quickly. However, I think this was an exception rather than a rule as I've seen the insides of pumps from many years of Webras and all but this one had the same (good) membrane material (this is why I asked when your Webra was originally purchased). Once I switch the membrane I had no more problems. Actually the pump is an extremely simple device and should hold up for hundreds of flights.

Keith B