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FAQ - Increase Performance

FAQ - Increase Performance

Q:

I want to boost the power of my TTR125. What combination is the best bang for my buck?

I am looking to boost the power of my daughter's 2004 TTR125LE. So far, I have a Two Brothers exhaust and the carb has been re-jetted. Next step would be a big bore kit. I have done some research and the BBR 150 kit gets some pretty mixed reviews. Some say the increase in power is very little. I see you have a 130 kit, and a couple of different cams. In your opinion, what combo would give me the biggest bang for the buck?

A:

The BBR 150 kit is definitely the best bang for the buck for getting more power out of the TTR125. Our 130cc kit is targeted for racers who are only allowed to go 1mm oversize. Those guys would not be race legal with the 150 kit.

What I would recommend to get the most out of the 150 kit would be to add the 26mm carburetor. The stock carb is actually about the right size for a 50cc motor. The stock carb definitely limits the amount of power the motor can make. With the 150 kit, the carb and a good exhaust you should easily double the original bike horsepower. Another thing that will make a big improvement is to lighten the flywheel. We offer a flywheel lightening service.


Q:

What is the best way to break-in my BBR 150cc Big Bore Kit?

Should I follow the stock, recommended break in for a new top-end or is there a better way?

A:

Yes there is a better way! Go to MotoTuneUSA.com and follow his break-in method. I started doing this a few years ago and have never had a problem. It just makes sense. The factory does us all a disservice recommending a slow break-in. I think the real reason for this comes from their legal department. They want you to ride your new bike cautiously until you get familiar with it. The break-in period is for the new owners brain - not the mechanical parts in the motor.

I was recently watching a documentary showing sport bikes coming off of a Kawasaki assembly line. Every bike was gently warmed up then went right onto a dyno and did a 'full throttle through the gears' dyno run. Then went off to have the oil drained and get crated up. They wouldn't be doing that if there was some harm to be done to the engine without a slow break-in.


Q:

Will BBR Rev Box make my TTR125 faster?

Hi, I have some questions about the BBR Rev Box for Yamaha TTR125. I do not understand where it goes in the line? Is it the coil, the part that provides electricity to the spark plug, or is it somewhere else? Will I get a bit higher top speed? How much more horsepower will I get with it?

A:

The BBR Rev Box replaces the original ignition module. The rev box (ignition module) sends the spark signal to the coil. Yes, you will get a slightly higher top speed and better engine response. The box by itself will not make more power. If you do other modifications then the box will allow getting the most benefit from those modifications.


Q:

TTR good for mini-motard?

I am a neophyte mini-motard enthusiast that cannot afford to buy ANOTHER bike, however I keep eyeing up my wife’s 2005 TTR125LE and thinking "Hey can I hop this one up?" Can you please offer some advice / experience on whether or not this is a good bike to set up for racing, and offer some cost effective "first" steps to making it a hybrid dirt / track bike?

 A:

Yes, racing my TTR125 is the most fun I've ever had on a motorcycle. There are lots of mods that will make the TTR faster and better. Here's a list. I will try to put it in a 'cost effective' order:

  1. Rejet carburetor / open up airbox
  2. Stiffer front fork spring
  3. Lightened flywheel
  4. BBR exhaust system
  5. 150cc big bore kit (check your race rules to make sure this won't bump you up to a class full of 85cc 2-strokes)
  6. 26 mm carburetor
  7. Works Performance shock
  8. 17" wheels with Maxxis dirt track tires

Also highly recommended is a BBR frame cradle and chain guide. Especially if there is going to be any jumping involved.