Hello, I'm Chris. Just so you know, I'm just a regular guy who loves dirt bikes! Let's strike up a conversation about what you're working on and if there are any parts I can help with. My first bike as a kid in the 1970s was a Honda Mini-Trail 50! While I'm an O. G. when It comes to motorcycles and parts sales,I have two teenaged sons racing Motocross so I hopefully can relate to you and your project!Both sons are partners and sell parts with me! This is a family affair to support our addiction to MOTOCROSS!!! Good luck on your project and happy Moto! Shipping: I'll pay your shipping for you! Remember, nothing is free so please consider the price I'm selling the part for has to pay for the part and shipping, oh and yeah, I might need to make a little to pay the bills! Haha Parts Compatibility and Fitment. I do my very best to provide a cross reference of models and years the part may fit, but this is only an estimate. I'll prove model the part was removed from, so please do your own research as to whether it may fit your application if it differs from the listing. So here's the story on this motor! Put together by an engineer who meticulously rebuild every component and assembly. All internal parts were measured and inspected, then replaced if not perfectly within spec. This is as close as you will ever get to a brand new engine. Absolutely zero hours. New piston, crank cylinder, bearings, shafts and gears throughout. This may very well fit in your CR85 chassis, but remember it is 3ccm smaller in displacement. This is a kick-butt motor! Even buffed and or polished engine and side case! You will not be disappointed! Includes hoses and spark plugs boot, stator, rotor, and carburetor! Please send any questions you might have!