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Very light and nimble, great ergos, inspires confidence and makes you want to ride every day. The versatility of the bike is almost unbelievable considering it's only a 150. It has great low end grunt, a midrange that is all about maintaining traction, and a top end that will shock your buddies on bigger bikes. It can be ridden off the pipe with great effectiveness (especially helpful on those slippery days) or it can be ridden like a rocket on the pipe. It resists stalling as well as any bike I've ever owned...and I've owned a LOT! I get 3.5 hours of moderately hard riding per tank of fuel, so the range is among the best in the business.
Now the bad news. As delivered the bike does have a couple of serious flaws, but they are easily fixed. The stock reed cage is junk. Replace it immediately with a V-force or Boyesen and you'll never have another worry. The progressive stock power valve spring is not well liked, and most guys replace it with the alternate straight-rate yellow spring. Some even prefer the red spring (from the 250/300's). Once you address the above items (and I recommend doing both before moving on to the next issue) you will still find that the jetting is horribly rich. This MUST be corrected early or you will be buying lots of spark plugs. Don't worry, the Mikuni is a great carb, it just needs to be jetted correctly. Once done you will be rewarded with phenomenal performance.