Looking for weber carbs/ cutting out problems

I have a problem with my carbs cutting out around 4300 rmp in low grears. The engine is only a couple years old, 1913cc, and my guy has filed out the jets. I am considering a new fuel pump. The webers are around $900 new. Any suggestions? Thanks

Did they work before? What kind of a fuel pump do you have?

What do you mean "filed out"? Drilled out?

Don't buy new carburetors just yet, More than likely, it's fuel pressure (also a bad fuel pump) clogged passage way/jets in carb's, bad timing, bad spark plugs and or wires, bad ignition module, manifold vacuum leak etc.

If you're not capable of diagnosing the problem, take it here:
http://sandblasterchassis.com/slavesaver.htm
Tell Mike that Larry Jowdy sent you

im guessing the main jets are clogged as they kick in around 3000rpm.
easy fix, take air cleaner off and unscrew the mains and clean/blow them clean. one of those metal ties around celery work just perfect.

Because the aperture in a main jet is huge, in only a very few cases will the main jets clog.

On the other hand, the idle jet apertures are very small and if you peel off the paper on a twist tie, the exposed wire makes for a good tool to clean those jets.

Idle jet problems can usually be felt and heard once the engine is started and goes away (sometimes) above 3,500 RPM's

Do you have a fuel pressure regulator back near the carbs? I believe Weber says no more than 3 or 3.5 psi? Most fuel pumps, both mechanical and electrical, exceed this without a regulator. Should have a quality low pressure gauge installed near the regulator also.

Does he currently have Webers or is he considering buying them cause his current carbs are problematic....I'm not sure?

Ahhh, I see Eddie's looking for Webers in the classifieds so that answers my above question....except, what is he running now?

I used to get Webers from a guy in Italy who advertised on Ebay. He would ask what I was running them on and jet them for me (supposedly...but he had excellant feedback) and then I look for manifolds and air cleaners also on Ebay. Usually $200 or so would get all I needed...you might try that.

Stick with Larry on this. There is nothing wrong with the carbs that can't be fixed, and there's probably nothing wrong with the carbs at all.

It sounds to me like you are running them out of gas, which should lead you to check those things Larry mentioned above.

And, a note about those little fuel pressure regulators most of us have: On mine, reducing pressure also reduces flow -- a lot! If I set mine at 2-1/2 I will definitely run out of gas and start cutting out at high revs. I don't know how many times I stripped the carbs down looking for a problem I didn't have. I set the regulator at 3-1/2 (Dellortos).

To demo this to yourself (if you have an electric pump) is disconnect the fuel line furthest from the pump and stick it into an empty clear container (one quart or more). On your wrist watch, time running the pump until it fills a pint at 2-1/2 PSI on the regulator. Then repeat the test at 3-1/2 on the regulator for the same period of time.

thanks for all the feedback, will share this infor with my guy tomorrow

Sure your spark is all squared away? Just asking, as a guy who more than once has replaced fuel filters, fuel pumps, etc. etc. and only then discovered . . .