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BikeMaster CR125M Rebuild | Part 2

BikeMaster CR125M Rebuild | Part 2
By Bikemaster December 17, 2019
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The disassembly begins. Motocross bikes are very straight forward to work on.

Our BikeMaster 1974 Honda CR125M project bike is ready for the disassembly process. The good news is an air-cooled, two-stroke motocross bike has very few components to remove in comparison to many other bikes. The bad news: 46 years' worth of dust and corrosion that tend to make the majority of the hardware stubborn to remove.

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The engine has seen many years of neglect and even more years sitting dormant.

We always recommend you take many photos to reference where all of the parts go and how they are oriented. Before starting, we also like to use BikeMaster Multipurpose lubricant on the hardware we assume will be difficult to remove. We also keep in mind that some of the components have not been removed for a very long time. Starting with the body (or what was left of the body) then moving to the engine and electrics, we were down to a rolling chassis pretty quickly. The wheels and suspension came off next, leaving the bare frame. Disassembling the bike systematically allows you to assess everything needed before the rebuild begins.

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BikeMaster Multipurpose Lube penetrates old fasteners and is your best friend to make stubborn bolts come loose.

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Making progress with the engine out of the frame.

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Persuading the larger bolts sometimes takes a little extra force.

As we remove each part, we verify if it can be restored or if it needs to be replaced. We try to retain the stock look of the bike while trying to keep the costs as reasonable as possible. For this bike, we’ll be using BikeMaster replacement parts and lubricants throughout the build process, and we’ll also reach out to some other sources for OE-type replacement parts for the various components that need replacing or that were missing when we bought the bike. Because the vintage bike scene is growing in popularity, some companies remanufacture hard-to-find parts. DC Plastics will be used for replica bodywork and seat components. While Vintco will be used for numerous engine components, as well as products from Wiseco.

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With the right tools and penetrating lube, the stripping process goes relatively fast.

Now it’s time to focus on finding a stock swingarm and get the frame ready for paint. Here we go! Look for part 3 of the BikeMaster CR125M Rebuild coming soon.

Go to Part 3 >>

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