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post #1 of (permalink) Old 06-27-2001, 10:44 PM
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over rev on start up

I'm hanging out in rural Utah this summer and the mechanic at the local shop sees my 87 Zuki and tells me a tale of woe about his. Says everytime he starts it, the engine revs real high. He says he's fiddled with the carb with no luck. I let him read my manual and he says he still has the problem. I'd sure like to help the guy but I've never experienced this problem and don't know what to tell him. What do you all think is his problem? Is there some specific questions I need to ask him so that you all can mull over his answers? My Ol' Zuki is doing real well and I don't have any problems but I'd like to help this guy out. Thanks for your help.

John in Utah

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post #2 of (permalink) Old 06-27-2001, 10:46 PM
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Re: over rev on start up

how high mine used to rev to 2500 tell it wormed up a few mintues and i have herd alot of people do these mine doesnt no that it has a pony on itt

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post #3 of (permalink) Old 06-27-2001, 10:48 PM
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Re: over rev on start up

same thing here then it just idles like a cat!

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post #4 of (permalink) Old 06-27-2001, 11:18 PM
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Re: over rev on start up

May not be the case in this instance but if the engine or carb/intake, etc... has ever been changed/removed, it might be worth checking the slack in the throttle cable. Once you have the correct amount of slack and there is a tach in the dash (if not a small diagnostic tach isn't very expensive), use it in conjunction with a timing light to make sure that everything is set correctly. Removing the throttle cable and not getting the tension right could hold the butterfly open some making the high idle seem extra high -- if the timing was set when the idle was wrong, the timing will also be off even though the idle seems to be right and it seems to be running well.

As a mechanic he is probably well aware - just thought I would throw it out there though.

I'll be back.

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post #5 of (permalink) Old 06-28-2001, 02:11 AM
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Re: over rev on start up

i had that problem, may not be the exact problem as mine, but i checked the carb and all, then i started pressin the gas pedal, it gave and stayed, then went down slowly. pedal felt weird, so i checked it all out down there, well just tell him to try and change his throttle cable. its probably frayed or all ready cut and stuck on the... umm jeez im sleepy, stuck accelerating. check the throttle cable at teh fire wall. laters, im hittin the hay.

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post #6 of (permalink) Old 06-28-2001, 06:58 AM
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Re: over rev on start up

mine did that for a while... this is gonna sound crazy but cross 2 plug wires and start it then shut it off and replace the wires... will blow the crap outta the carb thats causin the trouble

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post #7 of (permalink) Old 06-28-2001, 09:02 AM
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Re: over rev on start up

thats exactly what happened to mine...
my throttle cable was busted at the firewall and it wouldnt return to normal position for about 5 or 6 seconds... i made a quick fix with some springs (to pull the throttle on the carb down after the pedal is released) untill i could get a new throttle cable

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post #8 of (permalink) Old 06-28-2001, 09:10 AM
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Re: over rev on start up

It was the throttle cable in mine too. There's a plastic bracket that feeds through the firewall that sometimes snaps.

post #9 of (permalink) Old 06-28-2001, 10:11 AM
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Re: over rev on start up

On the bottom of the linkage on my rebuilt carb I installed
was an adjustment for the choke, I just played with that
until the rpm's dropped from 2500 to 1500 when its cold. Also
check the idle up solonoid, if it is stuck the idle will be
high and it will race with the choke on.

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post #10 of (permalink) Old 06-29-2001, 08:19 AM
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THANKS Re: over rev on start up

Thanks for all these GREAT posts! I don't use this list much but when I do I am always blown away by the hospitality and sincere advice which gets posted. This is THE BEST LIST I have EVER experienced in 7 years on the Net. You guys are all the greatest and I just think it worth it to say so once in awhile. THANKS!

John in Utah

PS--I will take these to that buy today and then let you know how it all turned out.

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