Rev Remains High takes 10 seconds to return to idle

[jfb130]

OK! Those of you who read about my carb leak and high rev problem. I fixed the carb leak with JB Weld. Seems to be holding up very well. No more leads around the nipples. Unfortunately, I still have the rev of the engine holding about 4k rpms for about 10 seconds after reving the engine.
If the problem is the carbs being out of sync. I am going to need someone to sync. them for me. Other than the carb sync problem does anyone have any suggestions why my rev is staying high and not returning to idel? Additionally, other than the Yahmaha dealer does anyone have any recomendations in South Florida (West Palm Beach) of where I can go to have the carbs sync'd and floats set? I do not have the facility (I live in an apartment) or know how to do it myself. Any help is appreciated as I bought this motorcycle and have put way too much money into it just trying to get a bike that I can ride recreationally. I appreciate any feedback that anyone can help me with.

Thanks,
Jason

[ratbyk]

Throttle Hanging Up

Jason, all of the things that you covered are possibilities. As you have stated , they are beyond you expertise. There is another possibility that you should be able to handle.
Pull the tank, start at the throttle and following the throttle cable, trace your way back to the carbs. Make sure that the cable/throttle has at least an 1/8" to 1/4" of an inch of free play. This is to insure that when you return the throttle grip to off, the cable is actually closing the carb throttle plates.
If you have this free play and know for sure that they are closing check that there is no binding in the cable, that the "outer" cable is sitting properly in it's yoke by the carbs.
Some times the simplest of problems can leave you groping.
Ken/Sooke
78E Ratbyk
82 FT500 "lilRat"

[scalded dog]

Jason, if you can take the carbs off, you can bread tie sync them, I printed off the step by step instuctions found here. no extra knowledge needed, common sense will take over once you start following the instuctions. Later 'Dog

[mitch]

Hey Dog

How Ya doing dog, long winter , but summers coming fast now. When ever i log on the site i click on the top where it says view new threads, and i never miss anything cause anything that was posted since my last visit comes up.Just a thought, works for me ,have a great day ......MITCH

[scalded dog]

Good advice Mitch, I too am waiting for summer, it is coming pretty quick down here in the southeast. Later 'Dog

[srq68]

As the other thread mentioned, check your cable for binding. Mine used to do that. I dripped some gun oil inside the cable sheath and it took care of that problem. Another way to find out if the cable does not return to its full closed position is to open the throttle (engine off) and release it, then push down on the butterfly mechanism where the cabble hooks onto. You'll see very quickly if the butterflies close all the way or not, as the arm that holds all the butterflies will travel a bit more towards the fully closed position.
Again, that means that something is binding either the cable, or grime has made its way in the hinges of the butterflies and slows down their closure. A meticulous carb cleaning and new cable should take care of that, but the quick and easy fix it to add a small spring that will help pull the butterfly linkage shut all the way.
With the engine running, the vibrations slowly help overcome the friction that is preventing the full closure, that's why the RPMs eventually come down. The carb synch could also help, it did on mine.
I am in Sarasota, if you take the trip accross the state, I have made a vaccuum gage for synchronizing the carbs. I'd be glad to help.