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I put a larger pilot jet (Don't remember size) in because it was popping a lot at low rpm and running hot. Note, I need to get a tad smaller one as my mix screw is all the way in for it to not be rich at idle and low throttle. My 147.5 main jet seems to be good at full throttle. I had to shim the needle pretty far... I had to grind the top above the clip a bit so that the spring and retainer could push in far enough into the diaphragm to hold. The bike is unrecognizable now from a performance standpoint. I have the 16t sprocket and in 5th can peg my speedometer. Cruise at 70mph I'm probably @35-40% throttle. Whereas before to do that I would have been around 75%+throttle. Around town I don't notice the extra torque and power in guessing because of the carb design idk. Get it on the highway though and the extra torque is not only very noticeable but welcome as well. It may lead me to try a 40t rear sprocket with the 16t front to lower rpm at higher speed. I'll try that at another time as I rarely driver her that fast and it would be more to ease my mind when I travel to Springfield occasionally, doing 65+ for 30 minutes. Reguardless if anyone is wanting to do the 300cc kit you will definitely need the 16t front. I've done all the work myself and it's pretty easy (though I used to build cars to race) and can all be done in one long day. I got the kit from alliexpress $147 and free shipping from China delivered in 6 days via dhl... The seller was Sam's motor store (very Chinese name lol). You need to choose the correct year even though they list it as the older gn250. In my research I found people that have had to mill the kits they get from eBay or wherever whenever they don't get one for their year range. I thought it was all the same but that's what I found online from reviews and others that had done 300cc kits from China. I got my 2007 gz250 for $950 with 7k miles. The idiot had 3.5 quarts of oil in it and the head gasket seeped oil naturally lol. The exhaust from y back is 1.5 and the 2 runners are 1.25 I think. I had the exhaust shop match it to the inside of the exhaust port after I ground out that huge lip. Shorty muffler, re jetted, k&n pod filter setup, 300cc kit, 16t sprocket, 320mm adjustable nitrogen rear shocks, and head was decked slightly. All my work into it cost me about $700. If crazy power and speed is your thing then this isn't your bike. With the mods though I think my bike is a testament that you don't have to break the bank to get this bike to be a very nimble, fun, and capable city or highway bike.
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