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rough idle after running at temp
  #1  
Old 05-18-2013, 10:22 PM
vmaxxx98 vmaxxx98 is offline
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Angry rough idle after running at temp

i have a 1998 that iv'e owned since new...so far i have flushed the coolant and made sure there were no bubbles in the system, changed the oil to mobil 1 synthetic, checked the thermostat and changed the plugs....basically what happens is, the bike starts without a problem, usually no choke, it runs like a monster pulling very hard...the temp gauge rarely gets past halfway...BUT, after 20 minutes or so of riding, the idle gets real rough and wants to die out at stoplight, i have to rev it to keep it going.....a little extra info: the bike was out of commision for the past 4 years and this was never a problem before...stage 1 jetkit and cobra slashcuts with 8 holes drilled in the back of each pipe (sounds GREAT too)
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Re: rough idle after running at temp
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Old 05-18-2013, 10:57 PM
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44boyd 44boyd is offline
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Default Re: rough idle after running at temp

Battery new? Might be losing power when the fan kicks on. Check wires for corrosion.
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Re: rough idle after running at temp
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Old 05-18-2013, 11:06 PM
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Default Re: rough idle after running at temp

Check voltage across battery with fan on, you should have around 13.8 volts. If not 13.8 your charging system has problems. A Vmax does not run well when the voltage is low.
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Last edited by alorio1; 05-19-2013 at 08:08 AM..
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Re: rough idle after running at temp
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Old 05-18-2013, 11:14 PM
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Default Re: rough idle after running at temp

Check spark plugs , wires & all connections especially to coils .
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Re: rough idle after running at temp
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Old 05-19-2013, 05:00 AM
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Default Re: rough idle after running at temp

If it is starting without choke then I would lean off the idle mixture screws - with the motor at operating temp turn each one back until the engine note drops the back out a bit.

It may also be worthwhile checking float heights.
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Re: rough idle after running at temp
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Old 05-19-2013, 09:18 AM
dwarf717 dwarf717 is offline
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Default Re: rough idle after running at temp

If the bike sat for four years, and was put back into use without having cleaned the carbs properly, then they need to be cleaned now. No way you can get away without doing it. If you can start that bike from cold without choke,it is because it is running way too rich, possibly from a dirty choke system which is not allowing it to close fully. The choke being partially opened would account for the poor idle when the bike is warm after 20 min., and it would also mask a poorly working , and dirty condition of the idle, and pilot circuits
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Re: rough idle after running at temp
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Old 05-19-2013, 11:25 AM
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Default Re: rough idle after running at temp

Quote:
Originally Posted by alorio1 View Post
Check voltage across battery with fan on, you should have around 13.8 volts. If not 13.8 your charging system has problems. A Vmax does not run well when the voltage is low.
My thoughts are you have low voltage to the battery, to prove or disprove my theory do this; If you have a car battery charger that puts out 4 to 6 amps charge rate, ride the bike untill it starts to act up and return home and connect the battery charger to the battery, on the 6 amp rate if available, while bike is running. You should see your bike start to run normal again within a minute or so. If it doen't respond then you can kick this theory to the curb and move on to other suggestions.......
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Re: rough idle after running at temp
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Old 05-19-2013, 06:52 PM
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Default Re: rough idle after running at temp

My vote was for electrical maladies as well. Electrical components have a habit of working OK when cold, and malfunctioning when they get hot (i.e stator or rectifier). Low voltage makes the Vmax's ignition act up. Once it's acting up, check the voltage across the battery with the engine running. If it's less than about 13 something's wrong. The fan draws a good bit of current, so if the charging system is just marginal normally, once it kicks on it can pull the voltage down pretty quickly.

My bike never really needed much choke unless it was a chilly morning, and even then 1/2 choke or less, and it would idle no choke pretty much instantly, albeit slowly until it warmed up a bit.
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Re: rough idle after running at temp
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Old 05-20-2013, 01:42 PM
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Default Re: rough idle after running at temp

I also reckon that if it sat for four years, the carbs need going through. The Shotgun may help, but there's a good chance it'll start acting up again quickly and there's no alternative but to go through the carbs properly to clean up the idle circuits..
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Re: rough idle after running at temp
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Old 05-20-2013, 02:14 PM
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Default Re: rough idle after running at temp

draining carbs into clear container to look for contaminants also checking fuel filter.....but as mentioned i think getting into the carbs wont be a waste of time.....
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