Hesitating at 2000 rpm... what's up with that? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-15-2002, 08:18 AM
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Hesitating at 2000 rpm... what\'s up with that?

Argh! Another problem: when I rev the engine up slowly, it starts sputtering and occasionally dies at 2000 rpm (load or no load). If I push it past that magic mark quickly, it runs fine, too. Vacuum lines tight, engine has 2000 miles since rebuilt, Weber carb, good plugs/wires, good idle at about 600 rpm, nothing that would tip me off immediately. What am I missing?

Thanks!

D.
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post #2 of (permalink) Old 05-15-2002, 08:40 AM
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Re: Hesitating at 2000 rpm... what\'s up with that?

How is the fuel pressure? Also, I'd be checking the jets , mostly the main primary side . Check the timing at that majic point , the distributor may be hanging up the weights at that rpm .
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post #3 of (permalink) Old 05-15-2002, 08:59 AM
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Re: Hesitating at 2000 rpm... what\'s up with that?

Dunno about fuel pressure, but the pump is only 6 months old, and the filter was replaced when the engine was rebuilt. I pulled the air cleaner this morning and it seems that the carb squirts fuel in before the secondary butterfly starts to open and is not atomizing it properly. If so, what do I look for?

D.
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post #4 of (permalink) Old 05-15-2002, 09:02 AM
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Re: Hesitating at 2000 rpm... what\'s up with that?

What size idle jets are in both sides, and what model Weber is that? The secondary idle jet may be too big , or the linkage is binding a little . Make sure the arms move real smooth, or it will jerk them open .
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post #5 of (permalink) Old 05-15-2002, 09:27 AM
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Re: Hesitating at 2000 rpm... what\'s up with that?

I haven't been messing with the carb, and it was running fine before - the whole thing kinda came out of the blue. If anything, I'd envision a jet dropping out of its hole. Linkages look good, by the way.
post #6 of (permalink) Old 05-15-2002, 09:48 PM
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Re: Hesitating at 2000 rpm... what\'s up with that?

Just unscrew the idle jets out of the sides of the carb , and clean them out real good . I'd say that's all that is wrong with it.
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