Easyboost Box of 10 5mm Jets for PHBG Carburettor

Easyboost jets fit all PHBG-type carburettors.

CNC-machined from brass, Easyboost jets are made to extremely tight tolerances, allowing you to tune your carburettor with pinpoint accuracy.

To get your jetting spot on, follow these steps:

Start by fitting a main jet that is deliberately "too big" to get a "rich" mixture and avoid overheating the cylinder and piston. The engine should then "four-stroke" (splutter) at high revs, which means the mixture is too rich.

Then work your way down through the jet sizes (in steps of 5) until the engine pulls cleanly and smoothly at high revs. You can also use the spark plug colour as a guide.

After riding flat out for a few hundred metres, kill the ignition and remove the spark plug straight away to check the colour of the electrode. It should be a brick red/brown colour. If the electrode is black, the mixture is still too rich, so drop down a jet size. If it is white, the mixture is too lean, so go up a jet size.

You'll find a very thorough tutorial here to help you with your tuning: https://easyboost.fr/en/blog/comment-regler-un-carburateur-17-5mm-sur-booster-nitro-am6-ou-derbi-n13