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i have a friend that has an 86 250r he is wondering what will it take to make his bike competable against a built 400ex and a stock 450r or is it worth it. he also has a 400ex but we here so much about the 250r s and how fast they are he kind of want to build it but if its not worth it let me know
you need good reeds,nice carb like 38mm keihin pwk air stryker,have ur head shaved for higher compression atleast 93 octane,bore it a bit and defenitly have a place with a good reputation port it,and last but not least get a good pipe like FTZ,trinity,CT Racing,and the bike will scream remember to take notice of limiting factors like if you had everything done but still had a stock carb etc....2 strokes are simple upgrade wise its choosing the right things to do and put on dont get junk if you want to go fast