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Home --> All Quad & ATV Parts --> Can Am Bombardier ATV Parts --> Can Am Bombardier Baja DS650 Par --> Bombardier Baja DS650 Keihin Power Pump (Advantage)

Bombardier Baja DS650 Keihin Power Pump (Advantage) [18065-00]

Price: $99.95

* Quantity:

* = Required Field

For Keihin FCR carbs ONLY

WHAT IS IT?

R&D Racing has followed up their successful Power Bowl
with an all-new accelerator pump cover that features an
adjustable leak jet.

WHAT’S IT DO?

Four-stroke engines bog, cough and pop.These
problems are caused by everything from air leaks
to mis-timed accelerator pumps to air in the
pump reservoir to bad jetting to inadequate fuel
flow through the leak jet. Of all the bugaboos, the
leak jet is the most mysterious. It is also the most
troublesome to work on.What is a leak jet? In the
simplest terms, a leak jet controls the amount of fuel
flowing through the accelerator pump nozzle. The
accelerator pump’s fuel circuit is split into two paths. The
first path is the nozzle to the cylinder head and the second is the return path to the pump reservoir. The leak jet meters the return path. The larger the leak jet, the more fuel is returned to the reservoir with each squirt, which means that less fuel goes to the engine. The smaller the leak jet, the less fuel is returned to the reservoir, while more fuel goes to the engine. In essence, changing the leak jet size changes the amount of fuel that the accelerator pump squirts into the cylinder head. A bigger leak jet will make an engine lean, while a smaller leak jet will make it rich. The R&D Power Pump is an adjustable leak jet. It allows a racer to change
the size of the leak jet orifice with a screwdriver (and you can do it with the engine running).

WHAT STANDS OUT?

(1) STOCK LEAK JET To change a stock Keihin leak jet you have to remove the float bowl from the carb and unscrew the leak jet. Leak jets typically come in sizes from 10 to 100 (a 70 leak jet has an orifice size of 0.70mm). It is a guessing game to select the correct size.This is a time-consuming process (given that most float bowls don’t come off modern four-strokes without removing the carb from the bike).
(2) POWER PUMP LEAK JET With the Power Pump, the leak jet size is controlled by an adjustable needle and seat. Although the float bowl has to be removed one time to install the supplied plug where the stock leak jet goes, there is never any need to remove the float bowl again.
(3) TUNING We tested the Power Pump on our 2008 CRF250, which had some box stock jetting issues. We installed the Power Pump and set the adjustable leak jet at 1-1/2 turns out. We made incremental adjustments and checked them with a throttle blip test. Two turns out would be to the lean side, while one turn out would be rich. We rode the bike at 2 turns, 1-1/2 turns, 1- 1/4turns and 1-1/8th turns.
(4) LEAK JET FACTS Our 2008 Honda came stock with a 70 leak jet. We felt improvement as we richened the adjustable leak jet. What does that mean? The large stock leak jet created a lean situation. Our CRF250 ran best with a smaller leak jet orifice— somewhere between a 60 and 65 (about 1-1/2 turns). With the Power Pump we were able to fine-tune the setting in seconds. This is a blessing when the temperature drops.
(5) PERFORMANCE. Loved it. The bogging disappeared and the power improved considerably. We went from lean to properly jetted in ten seconds.

WHAT’S THE SQUAWK?

Delta-Box aluminum frames make getting to the leak jet adjuster a juggling act. We had to use a very long screwdriver, from the right side of the bike, just in front of the shock.

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