|This is the
Main Air Jet location
on a Keihin FCR carburetor, as used on current (03-05) Yamaha and Honda
The early Yam 250's are a bit different, but the MAJ hole location is in the same place.
I, also, put a pointer to the pilot air jet, just in case you wanted to ask what that "other one" was.
|On some OEM (Original Equipment
Manufacture), Keihin FCR carbs, it is necessary to drill out the stock
Air Jet to use the Factory Pro HDJ emulsion tube's beneficial
Remove the emulsion tube, the slide and the needle.
Drill through the Main Air Jet inlet with the supplied precision drill
bit for your kit.
It's 46mm from the outside to the beginning of the
emulsion tube hole.
Perfect. That's done!
|Now - It's time to create a Factory Pro HDJ
Using the supplied instructions with the Factory Pro HDJ kit, drill (if specified and supplied) and tap (if specified and required), follow the HDJ carb kit instructions - and you will have a carb that will now perform better than any other "jet kit"!