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twinn cilendar 2 stroke dirt bike build

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A few pics of my kawasaki kr250 into wr400 frame build just reworking a few things on the frame to fit the new engine.cant wait to finish this bike should be awsome the kr250 motor makes 45hp and loads of low to mid range torq for rideing bush trails it should be great.

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That should be a very interesting bike! Are you planning on running 2 individual air filters mounted to the carbs, or tubes back to the original air box? I have so many questions.... You need to post a gopro video of riding it when you get done!

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I will be running two tubes to a custom airbox with a big single filter (no room for the stock airbox) 1380484153833.jpgas the kr was standard my bigest problem will be getting the rear expantion chamber under the seat like this gas gas has apart from that I have just modded the bottom frame rails to suit the shape of the new motor and it all lined up pretty good with where the chain needs to be just needed to make new engine mounts to suit there is a lot of work to do yet but cant wait to test it out. my goal is to have a bike that is light and nimble with a good torqey power curve for rideing in bush trails

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With a little creativity you will get it. One trick we used for making snowmobile pipes and figuring their best location is to make a disk representing the diameter of the pipe at every 25mm and then tack them to a wire to make a 3D bendable pipe of sorts. Makes visualizing the best layout a breeze.

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With a little creativity you will get it. One trick we used for making snowmobile pipes and figuring their best location is to make a disk representing the diameter of the pipe at every 25mm and then tack them to a wire to make a 3D bendable pipe of sorts. Makes visualizing the best layout a breeze.

i agree I did what you said with the wire and discs to get an idear what I needed but naw I hydroform my pipes its even easyer just work out the shape and blow it up

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