Motocross Product Review: R&D Power Bowl 2 Eliminates Bogging
Now a days, it seems like there is an endless supply of after market accessories and “bling” available for dirt bikes. Some aftermarket products are all hype, simply backed by high dollar advertising, while other products are absolutely phenomenal investments for vast improvements over stock parts. It’s tough to know where to throw your hard earned money. The R&D Power Bowl 2 is one of those products that has a lot of hype surrounding its performance. Does the Power Bowl 2 actually stand up to the test and work as well as claimed? We decided to perform a motocross product review to see if the Power Bowl 2 was “for real”.
Amongst team Chronic MX’s arsenal is a trusty 2009 YZ 250f. It may not be the fastest bike we own, nor the coolest, nor the most advanced…but it gets the job done and is one of the most fun bike’s to ride. The bike has great suspension, good handling, is extremely reliable…and has more than enough power via it’s BPM race engine, FMF megabomb, and Loudmouth air intake system. Unfortunately, the issue with the bike is a severe tendency to ‘bog’ at the worst possible times on the track. Like when landing hard off of a big jump. Our fuel injected four strokes definitely don’t have that issue, nor do our dialed in two strokes. The bogging is actually the only major problem we have ever had with our trusty YZ 250f.
Prior to this review, we had already invested in a JD jetting kit, which helped a bit, but regardless of how well we jetted the bike or adjusted the fuel screw…the bog still existed. This is where the R&D Power Bowl 2 comes into play. We had heard it was an excellent solution, and wanted to test the feedback that it would solve the 37mm Keihin carburetor’s dreaded bog. We ordered the R&D Racing Power Bowl 2 and installed it with relative ease. The directions were clear and easy, and getting a hold of R&D Racing with any technical questions was a breeze. The replacement of the detent spring could have possibly been explained a little better. The stubborn circlip holding the detent spring together was our only trouble at installation…be ready for several attempts when re-installing that clip. Also, be sure to work in a clean setting with lots of light, and be prepared to completely remove the YZ’s tank, subframe and shock, for easiest carberator removal. The Power Bowl 2 looks really trick…a black anodized body with a R&D logo, combined with a silver accelerator pump and a brass adjustable leak jet. We chose to keep our existing JD jets and needle in place. R&D had recommended going back to stock jets and needle upon installation, but we prefer the quality of the JD needle over the stock Yamaha needle. Leaving the JD needle in, we made very few adjustments, other than just moving the needle clip one notch leaner and reducing the main jet from a 185 to a 180. We also reduced the pilot jet to a 40.
The R&D Powerbowl 2 was for real…the bike ran much smoother. The infamous bog was almost completely eliminated. Though the original JD kit may have helped performance…adding the R&D Power Bowl 2 was truly the final solution to dialing in the fickle FCR carburetor. The product works and was worth every penny. We had to play with the fuel screw a little bit to get the response perfect, and finally set it at approximately 1 3/4 turns out. R&D Racing explained that one of the key secrets to eliminating our bog issue is their ‘zero tolerance’ jet chamber. Unlike the stock float bowl, the main jet chamber on R&D’s Power Bowl 2 is completely sealed, to prevent fuel from moving away from the main jet during heavy landings or bouncing. R&D also explained that the ‘impact bog’ we were experiencing was further reduced by using the modified anti-cavitation accelerator pump design combined with this improved jet chamber. By reducing the cavitation in the stock accelerator pump, the hesitation and bog was finally gone. The temporary lack of fuel caused by air pockets in the jet passages was virtually eliminated with our new modified carburetor. In addition, adjusting the leak jet is now a very simple task, eliminating the need to completely remove the carburetor each time a leak jet adjustment is performed. There is no question that R&D’s Power Bowl 2 helped the overall performance of our 2009 YZ 250f. Throttle response seemed instant, acceleration was strong, and the impact bog was fixed. R&D Racing’s Power Bowl 2 works extremely well and was a solid investment towards improving our YZ 250f’s performance. Cheers, Rocket 88.