Weber carb problems

Unknown member · Sep 25, 2001

I am going up to Tahoe this weekend but before I do, I need help in figuring out what the problem is with my carb. Sometimes (no apparent pattern yet) when the engine gets to 5500 RPM it will seem to be skipping,like it was sucking in water in the fuel. It is hard to explain, but I imagine it would be like if a valve was floating. Then it will keep doing this at lower and lower RPM's as I reve the engine back up during shifting and acceleration. It does loose
power when it does this. I have had it all the way down to 3500 rpm and it is skipping/stuttering/getting bogged down, and then all of a sudden it will clear up like nothing was wrong and I can rev the snot out of her again. I am not sure 100%, but it looks like the temp gauge drops below the operating temp mark. Would this have anything to do with it? I'm not loosing any radiator fluid that I can tell, so I don't think its a blown head gasket, and I cannot see any soot marks indicating a blown head gasket. Do you have
any ideas? Thanks for any help you can give.

Scott_CJ8 · Sep 25, 2001

an idea.... My weber did that too, only at lower rpm's. Seems the float wasn't adjusted properly. It was getting gas, but not enough at higher rpms to feed it. There are two adjustments on the float that control how much it drops, and how much it floats up before cutting off the gas. When the carb is sitting upside down (on your workbench - don't roll it to do this) the float should be parrallel with the top of the carb. Be sure to clean it good too. It could be something as simple as clogged jets, or whatever.
Good luck

Scott Trester - '88.5 Suzuki Samurai
http://RockPile4x4.tripod.com/Scott.html

Guest · Sep 25, 2001

i'm considering getting a Weber for my Zuk, is it worth it, and do you have to make the adjustment you explained before installing a brand new one?

NastyPimp

gi_zuk · Sep 26, 2001

They are setup good out of the box... for the road. For offroad you need to add a plastic float (more resistant to bouncing) and lower the float a little. The main problem with this carb is the way the bowl is vented. Solder up the vent holes and reroute the vent through the bowl over flow and you'll be in business.

1988.5 Zuk: OD Green Paint, ARB Bumper, OME Lift, 1.6 engine, ISKY DP Cam, Weber Carb, CF II Clutch, 4.16 Transfer, 30" tires, etc.

Scott_CJ8 · Sep 26, 2001

I think it's worth it. The adjustment I mentioned was made when I did a rebuild, she ran fine before that, so a new one should be ok as is. Some guys will install the carb 180 degrees spun, so that the float is toward the back and that helps to prevents stalling when going uphill. (mine is, and haven't had any problems on steep inclines). If you're running a stock carb now, have you tried the modified vent tube fix? I'd see what that can do for you before you spend the major bucks on a new weber - unless of course, you just gotta have one../wwwthreads_images/icons/smile.gif /wwwthreads_images/icons/wink.gif

Scott Trester - '88.5 Suzuki Samurai
http://RockPile4x4.tripod.com/Scott.html

Guest · Sep 27, 2001

The guage drop is curious. Could you possibly have a charging problem? Or a grounding problem? A loose alt. belt will sometime slip at higher rpm's but not at lower ones. Just some creative thinking.

88 Sam 4.16,welded rear,lockt frnt,31"Hi-tech MTR's, 4.5 spoa,5k Ramsey,rears in frnt w/ML's, Calmini cam n header.

Weber carb problems

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