But most of all, I was worried he would just whiskey throttle the hell out of the thing and end up tangled in a fence or do his best superman impression off a berm. After all, I'd seen him do it before. So I started looking around at what I could do to modify the throttle on the 65cc ripper. Here's what I did........
I browsed the internet to see what other people had done. There was no way I was the only Dad trying to figure this out. Surprisingly, I didn't find a whole lot. What I did find was an all inclusive solution that would work on anything carbureted. The solution here was to put a small piece of tubing over the throttle cable inside the carburetor. The tubing would only allow the the carburetor slide to raise to a certain point, limiting the intake of fuel and air and therefore limiting the throttle.
The problem I had with this solution is that I didn't want to be taking the carb off and pulling it apart every time I wanted to adjust the setting. Plus there's the initial setup of trying to get the length of the tubing right to get the limit you want. And what if the bike sits for a couple weeks and you need a bit more throttle to get it started the next time? What a pain in the butt! No thanks.
So I started to think of a different solution. I took a look at the throttle housing for the RM/KX 65 and realized I could actually drill and tap the throttle housing and install a throttle stop bolt. This way I could adjust it on the fly if I needed to and I could adjust it as my son progressed in his riding skills. And, wouldn't you know it, the housing had a factory indentation EXACTLY where I wanted to install the bolt.
I drilled out the hole and tapped it, making sure I didn't damage anything. I reassembled the throttle housing and tested it with the 2" bolt and adjustment nut. With the bolt all the way in, there was still a bit of throttle available to work with. This turned out to be perfect, since I had to give the kid a place to start anyway.
When it came time to teach my son how to ride his new bike, I jumped on the back of the bike and rode with him to teach him how to control the two stroke machine. I emphasized the importance of throttle control and showed him just how fast his little bike would go and how quickly it would accelerate. The throttle stop bolt allowed me to give the bike full throttle (as much as the throttle stop would allow) and get him used to recognizing how the rpm's would increase and at what point the power band would kick in. Even cracking the throttle open quickly still gave him some time to recognize the bike was speeding up before it just took off and left him behind. This gave him a boost in confidence and definitely calmed his nerves about riding a new bike.
After he had a healthy respect for his new dirt scooter, it was time to release him on his own. I helped him get started and then he was off and running......or riding. Whatever.
This little trick worked perfectly. Glad I gave it a shot instead of messing with the carb. So if your worried about your little rider getting on their new 65, you can always try putting a throttle stop on there until they're ready.
Hope this helps!
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