The Broken Moto Show - EP35 - Low Compression, What Now?
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 Published On Apr 27, 2021

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Question 1: 1979 Honda CB750. Clutch seems to aggressively grab when slowly trying to slip/manipulate the lever. Tends to just grab on or off.

Answer: It is likely due to corrosion of the plates and friction disks. We would suggest replacing it all as a set. Friction and steel disks. You may be able to get away with just purchasing the friction disks if you take the time to clean the steal disks.

Question 2: 2017 Kawasaki Vulcan 650s. Fuel injected bike that fluctuates its idle about 500rpm.


Answer: What kind of plugs did you put in the bike? If you still have the old plugs could you reinstall them and see if any change? Reinstall your O2 sensor and get a readout of your PGFI light/Check engine. CLear it completely once you do. When you replaced the airbox did you leave anything unplugged? Double check your work!

Question 3: 1989 CB400f (Euro). Low compression, running rough, not running on all cylinders.


Answer: Leak down test will help you pinpoint your next move. Fix your carburetor slide issue.

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