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idle speed goes up by itself

  • Thread starter Thread starter PAULYBOY
  • Start date Start date
Just to clarify: the idle adjustment screw (also called the throttle adjuster) is between the two carbs and you can reach between and behind the carbs to adjust it by hand. I'm pretty sure it's meant to be adjusted as needed based on the bike's operating temperature as it's relatively easy to adjust while you're riding.
 
Just to clarify: the idle adjustment screw (also called the throttle adjuster) is between the two carbs and you can reach between and behind the carbs to adjust it by hand. I'm pretty sure it's meant to be adjusted as needed based on the bike's operating temperature as it's relatively easy to adjust while you're riding.

If your idle speed is increasing more than a couple hundred rpm than something is wrong with your bike. Air leaks are the number one reason followed by pilot screw adjustment issues - too lean, and sync problems. Not sure but you may be accepting something that can be fixed.
 
I have a 450T as well. And the idle does have some variance as the bike warms up. But I've found that I can compensate for it using the idle adjust screw. I take it that's not helping in your case.
Well, Matt, when my son got home from the 1st day at his summer job, I asked him to go through again what he did before the idling issues began, or after he 1st noticed them. Whenhe called me from school several weeks ago and told me of the problem, I went thru trying to describe to him on the phone where the throttle cable linked to the rail for the carbs, thinking that somehow something had eother come loose or bound up. It turns out that what he was fooling with when we were on the phone WAS the idle adjustment screw. So, this evening, right at darkfall, I strated the bike up again and let it run for several minutes. Sure enoiugh, when I started to play with the screw, I got it to idle much more smoothly and at a tame 12-1500 rpm. I still probably have air leaks, and I've already ordered parts, but right now his choices are A. ride a 15 speed 24 miles round trip every day to work and back, which would be easy for him (he's doing a 50 mile marathon this weekend in St. Louis)
B. keep driving the 94 full size Bronco in town (10 mpg if he's coasting halfway)
C. use the motorcycle.
Hmmmmmmmmmm.........
 
WD40 with a long red tube spout is the best troubleshooting tool you can have for finding vacuum leaks in the carburation area. Just spray the entire area you suspect the leak is. My situation was old and cracked
carb boots. All of them were hardened, cracked, and were no good.

The idle should race-up in RPMs once the leak sucks in the flammable WD40 liquid into the combustion chamber. Soapy water serves no purpose since vacuum will suck the water in and rust the inside of
the carbs and or cylinder. Water will not burn, nor is it a fuel !!

Goodluck to you !!

:-D\\:D/
 
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