Throttle problem: Wide open

Kylixer · 07-30-2007, 10:46 AM

I bought a Yamaha DT MX the other day, and when I got it started it took me across the field I was on. The throttle is wide open, and when you try to change it at all, it does nothing at all. I have no idea what year the bike is, except that it's from the 70's or 80's...

tigmaster · 07-30-2007, 11:34 AM

so u are saying that the throttle is stuck open?

Kylixer · 07-30-2007, 02:36 PM

Yeah, all the way.

wr250f95 · 07-30-2007, 05:11 PM

was it pinned when it got stuck? maybe the throttle cable broke.

tigmaster · 07-30-2007, 05:23 PM

if the throttle cable does not appear to be broken then trace it back to the carburetor. it will enter from the top. unscrew the top and pull the slide valve assembly out if it will come out. if it doesnt come out then thats your prob. if it does come out then check the return spring. then check to see if the throttle cable moves freely in the sheathing. let me know if this get it solved.

Kylixer · 08-31-2007, 05:37 PM

Well, I checked those things, and when I force the throttle forward, to close it, it returns. But whenever you start the bike, it's still wide open whatever you do.

fatcat · 08-31-2007, 06:12 PM

id say your cable is sticking. really you need to take the throttle cabel off and make shure the throttle turns easy and then unhook the cable from the carb and see if the slid moves freely in the carb. also if the slide is round make shure you have the pin in the side lined up with the slot on the carb.

Kylixer · 08-31-2007, 10:12 PM

How would you fix a sticking throttle cable?

fatcat · 08-31-2007, 10:16 PM

try sprating pb blaster in the housing. or buy a new one, id say it would only be $20 at the most. it would be the easiest and safest way.

wr250f95 · 08-31-2007, 10:27 PM

ya, you could shoot some lube down the cable and get a little bit of life out of it, but safest thing is buy a new one, trust me, i learned the hard way lol

07-30-2007, 10:46 AM	#1 (permalink)
Kylixer C Rider Join Date: Jul 2007 Posts: 4 iTrader: (0)	Throttle problem: Wide open I bought a Yamaha DT MX the other day, and when I got it started it took me across the field I was on. The throttle is wide open, and when you try to change it at all, it does nothing at all. I have no idea what year the bike is, except that it's from the 70's or 80's...

07-30-2007, 11:34 AM	#2 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,526 iTrader: (1)	so u are saying that the throttle is stuck open? __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

07-30-2007, 05:11 PM	#4 (permalink)
wr250f95 Super Moderator Join Date: May 2007 Location: New Mexico Posts: 7,832 iTrader: (1)	was it pinned when it got stuck? maybe the throttle cable broke. __________________ "LIFE'S JOURNEY IS NOT TO ARRIVE AT THE GRAVE SAFELY IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN SIDEWAYS, TOTALLY WORN OUT, SHOUTING'...HOLY S**T... WHAT A RIDE!" this, is why I ride.

07-30-2007, 05:23 PM	#5 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,526 iTrader: (1)	if the throttle cable does not appear to be broken then trace it back to the carburetor. it will enter from the top. unscrew the top and pull the slide valve assembly out if it will come out. if it doesnt come out then thats your prob. if it does come out then check the return spring. then check to see if the throttle cable moves freely in the sheathing. let me know if this get it solved. __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

08-31-2007, 10:27 PM	#10 (permalink)
wr250f95 Super Moderator Join Date: May 2007 Location: New Mexico Posts: 7,832 iTrader: (1)	ya, you could shoot some lube down the cable and get a little bit of life out of it, but safest thing is buy a new one, trust me, i learned the hard way lol __________________ "LIFE'S JOURNEY IS NOT TO ARRIVE AT THE GRAVE SAFELY IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN SIDEWAYS, TOTALLY WORN OUT, SHOUTING'...HOLY S**T... WHAT A RIDE!" this, is why I ride.

07-30-2007, 02:36 PM	#3 (permalink)
Kylixer C Rider Join Date: Jul 2007 Posts: 4 iTrader: (0)	Yeah, all the way.

08-31-2007, 05:37 PM	#6 (permalink)
Kylixer C Rider Join Date: Jul 2007 Posts: 4 iTrader: (0)	Well, I checked those things, and when I force the throttle forward, to close it, it returns. But whenever you start the bike, it's still wide open whatever you do.

08-31-2007, 06:12 PM	#7 (permalink)
fatcat C Rider Join Date: Aug 2007 Posts: 59 iTrader: (0)	id say your cable is sticking. really you need to take the throttle cabel off and make shure the throttle turns easy and then unhook the cable from the carb and see if the slid moves freely in the carb. also if the slide is round make shure you have the pin in the side lined up with the slot on the carb.

08-31-2007, 10:12 PM	#8 (permalink)
Kylixer C Rider Join Date: Jul 2007 Posts: 4 iTrader: (0)	How would you fix a sticking throttle cable?

08-31-2007, 10:16 PM	#9 (permalink)
fatcat C Rider Join Date: Aug 2007 Posts: 59 iTrader: (0)	try sprating pb blaster in the housing. or buy a new one, id say it would only be $20 at the most. it would be the easiest and safest way.

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