SOHC.co.uk Forums > Project Board
New (to me!) '77 CB400F - US model
mattsz:
I'll probably do that... put it together enough to run it and give it a chance... just to satisfy my curiosity, if nothing else!
Lobo:
Matt - haven’t fully read the previous 23 pages of this post - ie forgive me, but are you performing the compression test correctly ie with the throttle wide open? (and plugs out). Page 1 says your bike has 22k miles (ie barely run in!) and it seems odd all 4 cylinders are ultra low .... and yet within a few psi of each other....
Simon
Addendum... and Air filter removed.
mattsz:
--- Quote from: Lobo on June 01, 2020, 10:38:27 PM ---Matt - haven’t read the previous 23 pages of this post - ie forgive me, but are you performing the compression test correctly ie with the throttle wide open? (and plugs out). Page 1 says your bike has 22k miles (ie barely run in!) and it seems odd all 4 cylinders are ultra low .... and yet within a few psi of each other....
Simon
--- End quote ---
Simon - very good question! I've actually let some of the details on this slide a bit, as my recent posts here have drawn little comment (with a few exceptions, of course - you know who you are, thank you!). No surprise, I suppose; I've done a lot of talking, but not taken much action in the past year-and-a-half. I'm getting bored of me!
I should have said: the carbs are currently off the bike, as is the silencer. I have four open carb insulators, and an open exhaust collector...
Lobo:
...that’s bad news; I’m no mechanic but frankly surprised all 4 readings the same given the significant loss of compression.
Hopefully this implies ‘good news’ - ie nothing mechanically buggered.
Bryanj:
It could be rings stuck in grooves and in all honesty it could go either way in get it running and hot , all frees up and then runs fine OR get it running and hot they stay stuck and it runs like shite. Either way i think its worth trying
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