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How To Compression Test Motorcycle Engine | Honda CB750 Resto Project Bike | Part 13

How To Compression Test Motorcycle Engine | Honda CB750 Resto Project Bike | Part 13 In this episode, I compression test my Honda CB750 project bike. I have spent some time fixing the carburettors and chasing leaking float bowls. Now that I have managed to have it running on 4 cylinders it was time to see if is sound. Here's what I used in this video: Compression tester: https://ebay.us/pbjIYp Compressor: https://ebay.us/Q1yndj Fire Extinguisher: https://ebay.us/Mks7nC When an engine isn’t run for a number of years it is always likely that either there will be sticky piston rings, or corrosion around one or two of the valves. This will cause some of the cylinders to be down on compression. Frequently when you run an engine that hasn’t been run for a long time the sticky rings free up, and the corrosion around some of the valves burns off. Sometimes it doesn’t! To do the compression test, one spark plug is removed at a time, so that a line to a pressure gauge can be fitted. Then the engine is turned over a number of times so that the pressure gauge shows the peak pressure the cylinder is achieving. The pressure for each cylinder is recorded so that they can be compared against each other. The wisdom is that the pressure should be above 100psi, the higher the better, but rarely above 140 or so. There should also be little difference between each cylinder, in that they should be within 10% of each other. You will have to watch the video to see what result I got! For more helpful how-to guides and restoration project logs, visit our blog: https://www.spannerrash.com/ As an Amazon Associate, Ebay Partner and Awin Affiliate, we earn a small commission from qualifying purchases. Some of our links are affiliate links, and if you decide to purchase things through them, we earn a small commission. It costs you nothing but helps us to keep the content coming. Thanks for your support!