I agree


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Posted by David Sherman [72.47.9.228] on Wednesday, December 15, 2010 at 13:39:35 :

In Reply to: Re: Real bad hesitation posted by junior [64.136.27.229] on Wednesday, December 15, 2010 at 11:51:33 :

With my rigs, it's always been the accelerator pump. One easy test is to look down in it while working the throttle to see if it squirts gas in. Don't do it with the engine running in case it tries to backfire in your face. There's enough gas in the bowl for several squirts. You can't do this with the military carburetor, which is frustrating, as is the fact that you can't prime the military carburetor by pouring gas down it like the civilian ones. On most carbs there's an adjustment for pump stroke by moving a pin to a different hole on a rod, so maybe moving to a longer stroke position would help. Most likely, though, since you say it hesitates "real bad", it's not pumping at all. It's possible something is clogged in the pump circuit, but in my experience it's always just been that the leather on the pump has gotten hard and isn't seating. I don't know why they keep using leather nowadays when we have all kinds of good fuel-proof synthetic materials.

I wish you could just buy accelerator pumps without having to buy a whole carb kit. The carb kits for most of these old carbs are getting hard to find and expensive, and the only thing that's ever really wrong is the accelerator pump. Some years ago somebody was selling bulk packs of accelerator pumps on ebay but I haven't seen them since. The pump interchanges amongst many different carbs, which is good because I think out of 5 running 230s and 251s that I have, there aren't two of them with exactly the same carb.



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