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For Takegawa 88cc through 124cc +R Superhead, Twin Spark, and DOHC bore kit owners, these version up kits will bump your displacement to the new 138cc performance standard for CRF50 XR50 and Monkey bikes. Kits come with all aluminum 138cc SCUT cylinder, forged aluminum SCUT piston kit, all new Takegawa coated crankshaft, and full gasket kit. - MM-1298 - +R and Twin Spark Version Up Kit
- MM-1299 - DOHC version up kit
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