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Yamaha MX & Off-Road Dirt Bikes
How to DE-tune a YZ250!
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[QUOTE="EricGorr, post: 144282, member: 19611"] That's great! You'll love that bike. Recently I worked on a similar project with a 60 something experienced rider and football athelete named Bob from the north shore of Chicago, on a KX250. Bob's kickstart leg had suffered from overuse and injuries in sports so he wanted a bike easy to start as well as one with a smooth electric powerband. Bob has all the TSR software and had experimented with different porting and head maps on his computer prior to contacting me about machining his engine's parts. We modified the cylinder for less port-time-area, reshaped the transfer port flow pattern for better scavenging at low rpm, and the compression ratio and bowl shape of the head was reduced by enlarging. The changes to the cylinder are non-permanent and can be returned to stock but the head mods are permanent. However if Bob ever decides to go riding in the Rocky mountains someday, we can just machine a new head and interchange it. Regarding examples of bolt-on accessories; Boyesen Dual-Stage reeds, a Steahly flywheel weight, and a spark arrestor tail-pipe will help and work with any internal engine mods you may choose in the future. Check out Boyesen's web page for the reeds and MX South for the tail-pipe and flywheel weight. Good luck [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
How to DE-tune a YZ250!
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