Red lined at start up

After completely cleaning ( several times) the carbs, sync, color tuned and running the bike it was running well. Didn't run it again for about 6 to 8 weeks while I stripped it down, cleaned , painted and polished the chrome, rebuilt brakes etc. lubbed the cables, including the throatle cable. Last night my son fired it up and it immediately red lined, he quickly turned it off. At first I thought likely the throttle cable or linkage was the culprit, but a quick look would appear not. Although i will have a better look once i pull the tank pff again. My next thought would be carb slides ? I did clean and polish them when the carbs were apart.. But as I have learned that doesnt mean much when your new at this...

Needless to say, will likely be pulling the carbs off again. Any other specidic areas I shoud focus on that could be the culprit.

 

Check your choke cable it might have got bound up and is pulling the choke open maybe. Had that happen once only reason I mention this.

 

I'd go back and look at the throttle cable/linkage again. Enricher cable would not cause it to rev THAT high just on a start-up........... That kind of rev indicate you're running WOT.

..............or you just developed some serious air leak- like a big crack or few in some manifold boot----

Dave F

 

yeah im with dave here. i would say air leak. but i would double check the cable. first.with the tank off. if you push on the adjustment screw on carb two with your hand does it slow down at all?

 

Air leak???

Red Line means THROTTLES WIDE OPEN!!!

Look for something holding the Throttles Open.

Clamp
Wrong Cable
Tight Throttle Cable
Handle Bar Control Position
Linkage hook-up jammed-up under the Head.

 

Happened to me and I found that the end of the throttle cable had not seated in its holder, effectively holding the throttle wide open. Make sure it is bottomed out in its holder.

 

Last time I talked with someone on this, it turned out that they had reversed the cables.......make sure you have the correct cables hooked up to the correct levers/ throttles/linkages.

Dave F

 

it actually does not require the plates to be at WOT for the engine to redline under no load.. . . as i was having this problem and it was just my bench sync wasnt right off by a hair.. instead of pushing on linkages. just un hook. the cable completely and start it. see what it does. perhaps it came unseated from its plastic groove in the bar control keeping tension on it. could also be like stated above. its not seated in its holder at the carb end either. it would have to be a signifigant airleak though lol

 

Dave,

Now that you mention it, I also recall reading that post, and wondering how one could possibly get the two cables mixed up ??. But nevertheless, just ran down to the garage and checked - now I feel stupid. While I still wonder how I got them backwards "I did" .. Just a reminder that often the problem is obvious" ... attention to detail, very important to go slow and double check even the simple things. Apparently it is easier then a thought to get them reversed.

THANKS

 

Hmmmmm, now there's an idea for a "Factory looking" cruise control. If you think about it that thumb slide for the choke is pretty stiff and stays where it's put during warm up, soooo, I wonder if it could be "Rigged" to work as a throttle lock for long rides, so that it works the throttle and not the choke.
Hmmm, am I making any sense on this or is my back pain meds (OXY) expanding my mind in the wrong direction?

 

Jarv, glad you found it. YES, it's easy to do that, but it's also an EASY fix, too!! That's what we're here for-- now go out and have a nice ride before it snows again.

Merry Christmas to you!

Dave F

 

It's virtually always either swapped cables or an obstructed throttle linkage; usually by snagging the quadrant on something when reinstalling the carbs, or an improperly seated cable end.

I think anyone who's had their carbs off/on a few times has probably done it to themselves at least once, I know I have.