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Recently my throttle was extremely stiff on cold starts but would free up after forcing it a bit and then act normally. I lived both the push and pull cables and they now move fairly freely but it now acts like cruise control and needs to be manually returned to closed.

I can't see a spring on the push side which I believe is supposed to be there. Additionally, with as much slack as I can put into it, the pull side won't close all the way automatically. I can also rule out the pulley running at the throttle time since I've checked it and also it won't even operate properly when opened up.

Do I need a spring on the other side/can it be installed without disassembling the bike? Any idea what the problem is?

I plan to disconnect each cable at the grip and see if they move freely or return to check for cables rubbing.
 

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There is only one spring and it's on the carb assembly where the cables connect.

A kink or broken wire in the cable would cause it to bind regardless of you oiling it. If either cable is damaged it will cause your problem. Also check the throttle tube to make sure it's not catching on the bar or housing.

You should be able to replace the spring without taking anything apart.
 

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A couple of my VN’s were doing this recently. After removing the carbs and moving the cables, there was no binding at all in any of the system. *scratches head* what ended up fixing it for me was adjusting the nuts to where the pull cable had just began to slack and the push cable was pretty tight. Any other way and it wouldn’t come back. The adjustment of those two will make it return properly.
 

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I found the throttle a bit stiff on two Vulcan 750s I bought new. On the second one, I removed the "push" cable, and thoroughly lubricated the cable that actually opens the throttle. Problem solved. No matter how well lubricated they are, two cables will always cause more friction than one. The way I see it, the cable is to open the throttle, the spring is there to close the throttle. If the cable broke, the spring would automatically close the throttle.
 

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I found the throttle a bit stiff on two Vulcan 750s I bought new. On the second one, I removed the "push" cable, and thoroughly lubricated the cable that actually opens the throttle. Problem solved. No matter how well lubricated they are, two cables will always cause more friction than one. The way I see it, the cable is to open the throttle, the spring is there to close the throttle. If the cable broke, the spring would automatically close the throttle.
If the broken cable isn't too frayed to move. Never saw a clean break on a cable.
 

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That could happen to the other cable as well. Alternative is to use the kill switch. I have always believed that the more complex something is the more likely it is to fail.
 
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