The main jets fit perfectly on my Pwk 28 carburettor with heavy jet and flat rail. Mounted on my '88 Yamaha Blaster and with all the different jets, jetting is very easy compared to Mikuni vm26 or vm28 where jets are about $7 a piece but Mikuni is a great carb and I just have no complaints about it no. I really worry too much about my performance as I don't race like on gravel at a good yet fun pace with my friends and it's easier for me to fly with them. My Mikuni injectors and the carburetor I have for the bike broke the main jet in the pilot jet so I decided to try something else and so far none of the jets have broken and it's working fine, it could get better if I buy a new bowl plug that doesn't drip. So I recommend them for any use as long as you have the right carburetor because injectors are injectors after all, they all do the same thing and just to remind you of your personal details if you are using a 2-stroke engine. Make sure you start with a larger jet and work your way down, don't deprive your cylinder of that much desired mixture of oil and gas or the piston will seize or burn out. Google a 2-stroke fork section to get a better idea. good view
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