Xr50 stuck throttle

My little brother has an xr50 and the throttle hangs you’ll give it gas the grip snaps bag but the throttle hangs open then after about 5-7 seconds then goes back down we took the grip off and pulled the cable back by hand and it still snaps back so it can’t be the cable what could it be please help

Sounds like a carb issue and running lean instead of a cable problem.  What’s your experience level with a wrench and tuning?  This can be an easy fix if you know your way around the carb or what to check.

Sounds like a carb issue and running lean instead of a cable problem.  What’s your experience level with a wrench and tuning?  This can be an easy fix if you know your way around the carb or what to check.


You know the way around the inside of the carb and be how to put it together but I’m not big on jets

I **

Well, that is my recommendation. To first take it off and try cleaning out the pilot jet. It is the brass tube located inside the bowl. Easy to get clogged up and very hard to clean. Some carb cleaner, copper wire, and compressed air are the best place to start. There are other things to try, but I would start there. I am assuming it ran great earlier, but then it sat around for a while and when you tried to run it you experienced these issues

Well, that is my recommendation. To first take it off and try cleaning out the pilot jet. It is the brass tube located inside the bowl. Easy to get clogged up and very hard to clean. Some carb cleaner, copper wire, and compressed air are the best place to start. There are other things to try, but I would start there. I am assuming it ran great earlier, but then it sat around for a while and when you tried to run it you experienced these issues


No we just got my brother it for Christmas never ran it and then on Christmas we found the issue
Well, that is my recommendation. To first take it off and try cleaning out the pilot jet. It is the brass tube located inside the bowl. Easy to get clogged up and very hard to clean. Some carb cleaner, copper wire, and compressed air are the best place to start. There are other things to try, but I would start there. I am assuming it ran great earlier, but then it sat around for a while and when you tried to run it you experienced these issues

Is it the one that’s in the actual bowl or up at the bottom of the carb beer the one that screws out
38 minutes ago, Hunter743 said:


Is it the one that’s in the actual bowl or up at the bottom of the carb beer the one that screws out

Yes, the jets should screw out... I would pull the pilot and main jet (both copper so be gentile). Before doing this though ensure that you dont have an air leak somewhere. I have seen 50's with crappy air filters that allow too much air in through a gap and cause it to run lean. If everything is bolted together and snug then yes, pull the carb, take off the bowl on the bottom (easy on the rubber gasket, you will need this later), and locate both brass "jets". both should have small numbers on the sides of them. Clean it all good with carb cleaner and compressed air and rebuild. Make note of the numbers on the jets.... If this does not fix the issue you will need to buy a jet kit but you wll need to know what jets are currently there to know which direction to go and what to buy.... Another alternative is to buy a whole new carb, they are cheap on ebay, especially if you go Chinese. Best of luck

Yes, the jets should screw out... I would pull the pilot and main jet (both copper so be gentile). Before doing this though ensure that you dont have an air leak somewhere. I have seen 50's with crappy air filters that allow too much air in through a gap and cause it to run lean. If everything is bolted together and snug then yes, pull the carb, take off the bowl on the bottom (easy on the rubber gasket, you will need this later), and locate both brass "jets". both should have small numbers on the sides of them. Clean it all good with carb cleaner and compressed air and rebuild. Make note of the numbers on the jets.... If this does not fix the issue you will need to buy a jet kit but you wll need to know what jets are currently there to know which direction to go and what to buy.... Another alternative is to buy a whole new carb, they are cheap on ebay, especially if you go Chinese. Best of luck

I didn’t check for leaks I cleaned the carb but I’m not did the pilot jet and it is sooooooo much better

I just addressed a similar issue on my cr 250 the throttle lost its snap back I pulled the carb but seen no issue there the slide glides smoothly it was surprisingly spotless (hasn’t been cleaned for months and I didn’t drain the bowl last time I rode it)

so I removed the cable and throttle tube. the cable was good but the grease in the throttle tube housing was dusty causing more friction than necessary. I cleaned it with wd40 and put a little chain lube on the cable and on the bar, re assembled and it works like new. 

image.jpg

Yes, the jets should screw out... I would pull the pilot and main jet (both copper so be gentile). Before doing this though ensure that you dont have an air leak somewhere. I have seen 50's with crappy air filters that allow too much air in through a gap and cause it to run lean. If everything is bolted together and snug then yes, pull the carb, take off the bowl on the bottom (easy on the rubber gasket, you will need this later), and locate both brass "jets". both should have small numbers on the sides of them. Clean it all good with carb cleaner and compressed air and rebuild. Make note of the numbers on the jets.... If this does not fix the issue you will need to buy a jet kit but you wll need to know what jets are currently there to know which direction to go and what to buy.... Another alternative is to buy a whole new carb, they are cheap on ebay, especially if you go Chinese. Best of luck

So I pulled the bike out yesterday to get gas going through it and it was doing it again, I give it gas and it keeps reving high I moved the clip all the way up and it’s better but it idles like crap the idle is sputtery and the rpm jumps around

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