The Honda CRF150R is a great motorcycle for the younger rider that maybe a little too large for an 85cc 2-Stroke bike. The CRF150R is also a great way to transmission from minibikes to full size 250F 4-Stroke bikes.
There is two ways to make the transmission minibikes to full size bikes. You can stay on 2-Strokes and ride super mini’s (big wheel) then transition 2-Stroke 125cc full size bike and then finally to a 4-Stroke 250F.
Now let’s say you are a larger rider you can turn to the CRF150R them the big wheel CRF150RB Expert (big wheel) and I feel the transmission to a 4-Stroke 250F may come faster and easier.
I know racers focus on the 2-Stroke Supermini’s, but I feel for some riders you are overlooking a great that for some rider’s the CRF150R may work out well.
The first thing you must make sure is the motor is in great condition. If you try get more power out of a tired motor in most cases, you end up with a mess. A bike that breaks down with major components failing and a lot of DNF’s. Remember most of will not have a Pro career so the time you spend riding and racing with you kid is priceless. Enjoy that time, remember if first must be fun.
First let’s talk Engine – Maintenance:
The Garage Buddy Engine Rebuild kits or Wrench Rabbit engine rebuild kits are engineered to meet or exceed OEM quality. Kits contain all the needed parts to repair the bottom end and top end components. With a freshly rebuild motor you can expect easy starting with restored horsepower improved throttle response, with smooth trackable power. The Wiseco kit also includes an hour meter so you can track the motors running time. Track your engine and critical service intervals and insure proper maintenance. The Wrench Rabbit kit also supplies you with new transmission bearings.
Note – neither kit includes any valve components in kit.
Links to Motor Rebuild kits
Now that we have a sold engine, lets think about making more horsepower. Starting with the air intake.
The No Toil Super-Flow Air Filter Kit Is Designed to Increase Horsepower And Throttle Response On Your 4-Stroke Motorcycle. How Does No-Oil Do That, The First Thing No-Toil Does They Start by Manufacturing Their Own Screen Less Air Filter Cage. This Cage Allows Greater Air Flow, Better Throttle Response and Increased Horsepower of your CRF150R / CRF150RB Expert.
Next item is a simple drop in replacement Came Shaft (Stg.1 or Stg. 2)
To keep it simple the Stg. 1 cam will increase low to midrange power and may take some over rev. away. Will be a great choice enduros riding or tight MX Tracks.
The Stag.2 camshaft is for a advanced rider on larger Motocross tracks. Will slightly decrease low end power, but greatly increase midrange to top end power
Next now that we have more air we need to match it with additional fuel. By adding the correct Jet Kit we an improve performance. Allowing the additional air and fuel to pack the cylinder and create more power.
Now that you are getting more air in to the motor. To make more horsepower we have to get the burnt exhaust gases out efficiently. Install a high Flow exhaust system
DynoJet takes your performance to new heights with a Carburetor Jet Kit for your Honda CRF150R / CRF150RB. The DynoJet Kit will increase power and improve performance throughout the entire RPM range, while dramatically improving throttle response. These Carburetor Jet Kits take the guesswork out of tuning your dirt bike. You should see a increase power 5-8% through out the RPM range.
The RS-2 is a potent and versatile design that evolved from our original TRC, engineered to provide increased power and power delivery. With a different pyramidal shape that features increased volume, the RS-2 is a quieter system with a larger core - and it offers the added bonus of outstanding performance in a value-priced package.
Now that we have more power to work with let’s make sure the power goes back to the ground. Clutches are often overlooked. When using a good new performance clutch kit, it will unleash the engines power reducing slippage increasing torque. When looking for a strong performance clutch Hinson FSC Complete Clutch Kit FSC290-6-001 is the best choice for performance and reliability.