A little while ago I purchased an OX-Brake Left hand Brake from Ox-Brake in Colorado (
http://www.oxbrake.com/). I have liked the brake and have had zero issues with it. Well, about 3 weeks ago I get a package in the mail from OX-Brake and in it is a new throttle tube. Chuck, the owner of OX-Brake asks me to give it a try and then give him feedback on it because he is trying to decide if he is going to sell them.
What he told me was the advantage of this new throttle tube over the stock one is that his throttle tube would give you precise control at the lower end of the throttle range while providing the same throttle response in the upper throttle range. He also went on to say that it will be especially desirable in technical areas such as Moab. He wanted me to give it a try and provide him with some feedback on it. The throttle tube is made for KTM 2 strokes from 1998-2014 and is literally a replacement.
I haven’t had much time the last few weeks to try it out so I knew I was headed to ride the Chimney Rock area and thought I would hurry and install it. I pulled my grip off of my old throttle tube and then removed the old tube and compared them side by side. What I noticed was the initial incline of the plastic ramp the throttle cable went in was substantially steeper which would really pull on the throttle cable during the initial throttle twist. Once the old one was off and before I could put the new tube on, I had to cut off the end of the tube so my handguard could be mounted inside the handlebars. Once that was done, I glued my grip back on and then safety wired them. The installation was just like putting on a stock throttle tube. No big deal there.
When we got to the area we were riding, my oldest son wanted to ride my bike so I decided to ride a friends KTM300 for a bit while he rode his YZ450. After a while I decided I wanted to ride my KTM300 so we did some bike swapping and I wound up back on mine. I used to ride a WR450 and that bike was really smooth and the weird thing is my KTM was running really smooth as well. I kept thinking in my head that it was abnormally smooth. Every 2 stroke I have ever ridden sputters right when you get on the throttle until you get to the power band and then it smooth’s out and takes off. My KTM sputtered just like everyone else’s does. I put an S3 head on my 300 to try to clean up the bottom end which it helped some but just like every other 2 stroke out there, it still sputters. After a few minutes of riding my KTM I remembered that the only difference between that day and any other day of riding was I had put on the throttle tube from OX-Brake. I had one of my other friends with me that day who has a 300 set up almost identical to mine ride it. I didn’t tell him what I had done, I just asked him to ride and tell me if he noticed anything with it. He got on and took off and about 50 yards later he stopped and then started again. He did this like 5 times and then he went and slowly climbed a hill and then started and stopped a couple more times. He then came back to me and asked me how I changed my jetting because the sputtering was nearly gone and that it was so much smoother than his. I told him that I had not changed the jetting and he took off again. This time I followed him and we ended up on a dirt road where he got it up to 40+ mph for a little bit and then started the whole start and stop bit and then back up to high speed for a while. He then stopped and said that the high speed sputter that you have with a 2 stroke was gone when you are just running in high gear between 50 and 60 mph. I hadn’t ridden it that fast so I didn’t notice it but I then got on it and rode it down the road and sure enough, the sputtering was pretty much gone.
In the last day or two my friend and I have talked about this new throttle tube and have decided that because the initial cable ramp is so steep that it quickly pulls the carb past the sputtering into the power band smoothing the power out immensely. Its crazy what a difference this can make. I’m sold on the OX-Brake throttle tube as well as my friend. We can’t wait to get more and try it on my friends 300 and his son’s KTM 250. I am glad I was asked to try it out because I now have an incredibly smooth KTM300.