I will repeat this again at the bottom of the page but I need to say up front that this mod should be done only if the bike has a desnorkeled air filter and a full exhaust system. I do not recommend this be done with slip on or stock systems.
Drilling the slide holes is actually quite easy as you will most likely be rejetting at the same time. You need to remove the diaphragm /slide from the carb (please refer to the rejet page and shim page for instructions).
The next step is to remove the needle assembly from the slide with a pair of needle nose pliers as shown in the first photo. Don't lose any parts!
At this point you need to locate the slide hole. The slide hole to be drilled is the smallest hole located above the needle hole (please refer to the second and third photo)
You need to use a Number 54 (see chart) drill bit. A #54 drill bit is .055 inches in diameter. if you cannot locate a #54 bit then you can use a 3/64 drill bit (which is smaller in diameter but bigger than the stock hole). DO NOT USE A 1/16 DRILL BIT -TOO BIG! It is worth the search of local hardware stores or borrowing one from a mechanic.
You got the bit, you got the drill and you got the slide. Now is the time to do what comes natural. Drill the hole. Be sure you drill the smallest hole (refer to the third photo again to be sure). Carefully drill it out straight and not forcing the bit. You want a clean smooth hole when done. Please refer to the fourth and fifth photos.
When both slides have been drilled you can reassemble the needle assemblies (make sure the locking tab locks in all the way) and install the slides back into the carbs.
Finish your jetting, finish installing carb assemblies and double check to make sure you tightened all bolts and reinstalled all hoses. Now you are ready to start the bike up.
You may have to adjust the idle. Without a doubt once you get out on the road you should notice a difference. I noticed the front end came up much faster than my old configuration and had to get used to the faster throttle response. I was very happy with this extra little mod. |
