The final parts of the rebuild were the intake and exhaust systems. I prefer round slide carburetors to vacuum carburetors, so I purchased an incomplete set from eBay. I completely rebuilt them only to discover that Honda had they have a different center-to-center spacing then the engine I had installed.
Apparently, when Honda switched the CB650 from slides to vacuums, they changed the spacing of the cylinder head intake runners, rather than modify the carbs. I decided to disassemble my set, fabricate custom piping and brackets, modify the throttle and choke linkages, and respace them to match the head.
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| Disassembly Begins |
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| Grinding clearance into the carb bodies |
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| Custom crossover piping |
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| Narrowing a factory fuel fitting |
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| Drilling new holes in the throttle linkage |
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| I modified a set of spacers from the later vacuum carbs to lock the rack together. |
Finally, I fabricated a new exhaust system. An aftermarket 4 into 2 CB650 exhaust will not clear the footpegs on a CB500 frame, so I purchased several rotten sets of original CB650 pipes. A few weeks with a hacksaw and hand file, as well as a pair of stainless 2 to 1 pipe fittings, and the bike was complete!
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