86 VT500 hesitation at high rpm - Honda Shadow Forums : Shadow Motorcycle Forum
 
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post #1 of 8 (permalink) Old 08-17-2009, 09:55 AM Thread Starter
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86 VT500 hesitation at high rpm

I have an 86 VT500 that hesitates at RPM over 5000. Its a jerky on-off feeling. Anything under that and it runs like a champ. I've checked the air filter and fuel filter and both are clean. I haven't checked the plugs yet, still need to get the tool to remove them. I know pretty much nothing about taking apart and cleaning carburetors, are additives like Berryman B-12 safe to use on the bike? Are they effective? Or any thoughts on other things that may be causing the hesitation?

86 VT500C
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post #2 of 8 (permalink) Old 08-17-2009, 09:02 PM
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Re: 86 VT500 hesitation at high rpm

Quote:
Originally Posted by bnhunt
are additives like Berryman B-12 safe to use on the bike? Are they effective? Or any thoughts on other things that may be causing the hesitation?
Yes and yes. Does that model have a rev. limiter? Most do....but 5K is probably a little low for that to be cutting in.
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post #3 of 8 (permalink) Old 08-18-2009, 08:45 AM Thread Starter
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Thanks I just put some B12 in this morning so we will see how that helps. It doesn't redline till something like 9k so I doubt the rev limiter would be stepping in. Plus I can keep giving it throttle and continue to accelerate while its hesitating.

86 VT500C
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post #4 of 8 (permalink) Old 08-18-2009, 02:04 PM
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Be sure to change all 4 sparkplugs. Owners tend to forget about 2 of them and they can be really old and bad.

Get NGK plugs at OReilly's. They are the cheapest.

I used a Sears sparkplug socket (2/8" drive) with a flex handle.
It worked well.

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post #5 of 8 (permalink) Old 08-18-2009, 08:08 PM
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how old is your battery? If it is in question replace it and check for abour 14.4 volts at the battery when you rev 3000rpm. Charging system issues will cause high rpm problems. Also sync the carbs.



1981 cb750c with 900f forks, cams, oil cooler.
1983 vt500c
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post #6 of 8 (permalink) Old 08-19-2009, 08:56 AM Thread Starter
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Thanks for the replies. The battery is less than a year old so I don't think thats the problem. I went about 30 miles yesterday with the B12 in the tank and it seems to be doing its job already, it still hesitates but not nearly as much.

I intend to change the plugs next time I have a chance to work on it. Thanks for the info on the Sears tool, I'm sure the one from Honda is way overpriced. I also want to adjust with the pilot screws on the carbs, the covers are off of them so I think its safe to say a previous owner has messed with them.

86 VT500C
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post #7 of 8 (permalink) Old 08-19-2009, 03:05 PM
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Quote:
Originally Posted by bnhunt
Thanks for the replies. The battery is less than a year old so I don't think thats the problem.

did you check it with a voltmeter? If not you should. Get a multimeter. If you dont need it now, you will down the road.



1981 cb750c with 900f forks, cams, oil cooler.
1983 vt500c
1979 cbx
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post #8 of 8 (permalink) Old 08-20-2009, 11:40 AM Thread Starter
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I have not checked it with a voltmeter but I definitely will when I change the plugs. As always, thanks for the advice!

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