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Discussion Starter · #1 ·
A few months back I purchased a 1980 XC500 Deluxe. She needed a few things but I got it running pretty quick and thought I had everything settled. I finally got to ride it the other day and today I got plates for Her and was ready to ride but now I have problems. Today I was warming it up and everything was going swell. Gave her some gas and I believe I heard a pop or a snap and the rpms ski rocketed. I turned it off quickly and played with the throttle. Started her back up and thats when I realized the throttle didnt snap back anymore. It moves back a slight bit but not all the way.



Now the question is, think this is a cable issue or something else? And what is the possibility of damaging the engine with the skyrocketing rmps? The thing tached out but only for a second or two before i turned the key off.



I was really excited to ride today but things happen I guess.
 

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The first thing I would do is look at the cables and find out what broke. Most likely the emergency "pull back" cable broke, especially if the throttle still opens. You can disconnect that (it is not needed except as a safety feature) and see if the throttle snaps back.



-Brendan
 

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Discussion Starter · #3 ·
okay ill give that a try. Thanks



If I take that cable off and it snaps back then I just need to replace that cable right?
 

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okay ill give that a try. Thanks



If I take that cable off and it snaps back then I just need to replace that cable right?
correct,they are readily available.why not replace both,the A and B cables at the same time,if one broke........well you know..sods law
 

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+ 1 to bandit but i am thinking its the push cable (the one that opens the carbs) for the simple reason is the PO said it came back a little so if the push cable snapped the pull cable (i believe) would still work





but i only run 1 cable and my throttle still snaps back and yes its not that good of an idea but i dont have the best luck with throttle cables i have snapped 3 sets already so i am just going to run the one cable
 

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Discussion Starter · #6 ·
I plan on replacing both cables. I had planned on replacing all cables over the winter. Ill order up some cables tonight and play with it in the next couple days hopefully ill get her back up and riding soon.



Thanks for the help
 

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I only run the one as well
 

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A few months back I purchased a 1980 XC500 Deluxe. She needed a few things but I got it running pretty quick and thought I had everything settled. I finally got to ride it the other day and today I got plates for Her and was ready to ride but now I have problems. Today I was warming it up and everything was going swell. Gave her some gas and I believe I heard a pop or a snap and the rpms ski rocketed. I turned it off quickly and played with the throttle. Started her back up and thats when I realized the throttle didnt snap back anymore. It moves back a slight bit but not all the way.



Now the question is, think this is a cable issue or something else? And what is the possibility of damaging the engine with the skyrocketing rmps? The thing tached out but only for a second or two before i turned the key off.



I was really excited to ride today but things happen I guess.




I think the throttles are closed by a coiled spring between the carbs. Check to see if that is broken before spending money on cables. Do you know how to remove the tank for access?
 

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A few months back I purchased a 1980 XC500 Deluxe. She needed a few things but I got it running pretty quick and thought I had everything settled. I finally got to ride it the other day and today I got plates for Her and was ready to ride but now I have problems. Today I was warming it up and everything was going swell. Gave her some gas and I believe I heard a pop or a snap and the rpms ski rocketed. I turned it off quickly and played with the throttle. Started her back up and thats when I realized the throttle didnt snap back anymore. It moves back a slight bit but not all the way.



Now the question is, think this is a cable issue or something else? And what is the possibility of damaging the engine with the skyrocketing rmps? The thing tached out but only for a second or two before i turned the key off.



I was really excited to ride today but things happen I guess.




I think the throttles are closed by a coiled spring between the carbs. Check to see if that is broken before spending money on cables. Do you know how to remove the tank for access?
 

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FOWG, that is a good point. He really should take a look before he buys anything.
 

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Discussion Starter · #12 ·
The situation has been sorted out. One of the nuts fell off the adjuster and slid down the cable and lodged the throttle open. Adjusted everything and made sure it was tight. Works well now. Thanks you all for the help.
 

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glad you found out the problem before you spent any money
 

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So today I started the bike for a 5th time since I received her...........cleaned the carbs

one was beautiful the other *R* side was a mess. I knew I had not properly adjusted the

cables but found out that one of the cables was broken. *should have checked but was trying

to beat the rain* so if you use only 1 cable which part of the carb would I attach the 1 cable to?



Any help would be greatly appreciated.......On my throttle the one that broke is on the outside of the throttle itself or the one that attaches to the right side of the throttle

handle.



Plus why is it dangerous to only use 1 cable? I want to ride. Also, what is the proper way to adjust my cable(s)?

How will I know I have it right?



al



whidbey island, wa. state
 

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It's dangerous to ride with only one cable because if the spring fails to pull the throttle back then the second cable pulls it back when you twist the throttle back. But it's not really a bid deal seeing as the spring should never fail as long as you spray it with a lubricant at least once a year.
 

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It's dangerous to ride with only one cable because if the spring fails to pull the throttle back then the second cable pulls it back when you twist the throttle back. But it's not really a bid deal seeing as the spring should never fail as long as you spray it with a lubricant at least once a year.




thanks blind you just reminded me i have to lube my spring tomorrow
 

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Note also that the bracket that secures the A/B cable on the carbs has a,"Stop" lug.If this has been bent it can allow the throttle cable to open the the butterflies too high and they can lock onto the the Slides holding them fully open.

If this is the case the carbs need to come off and the bracket/lug bent back so it can correctly prevent this and tested so this occurrence cannot happen.For most people this may never be an issue but a recent set of carbs I serviced had this fault.



HTH.
 
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