SOHC.co.uk Forums > CB350/400
No Vacuum on Carb#1
hairygit:
You bought it as a non runner. I guess you haven't done a compression test? If you have, what were the readings on cylinder 1? I hate to be the harbinger of doom, but if you bought it as a non runner there are so many things it could be. Damaged/ bent or siezed valve, holed piston, knackered rings/ bore. So first thing, get that plug out and and hold your finger over the plug hole while winding it over or kicking it over with throttles wide open. If it doesn't blow your finger of the hole, it's going to need further investigation.
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element137:
Just to clarify couple of points - I've had it running before, although very briefly and very rough - and I am pretty sure cylinder 1 was running OK (although not long enough to get any real temperature into it) - when I said I couldn't get the spark plug out it's because I didn't have a socket/box spanner - so as far as I know it should come out when I get a chance - apologies for the confusion - I have ordered a compression gauge so I can check all cylinders anyway as a general health check - lesson learned - should have done it before taking carbs off etc -
Johnwebley:
I suggest you get a replica Honda plug socket.
Not expensive. But invaluable
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robvangulik:
--- Quote from: element137 on January 11, 2021, 01:58:36 PM ---I have ordered a compression gauge so I can check all cylinders anyway as a general health check - lesson learned - should have done it before taking carbs off etc -
--- End quote ---
That is one thing you can do very well without carbs, at least you can't forget then to open the throttle fully ;D
ph0010421:
Oddly enough, I had no vac on cyl 1 doing a synch this weekend with my cheap 'red box' guages.
Reason...there was no hole in one of the extension tubes. I also thought the guage was fubar.
Other than that (there's loads of different tubes included, so no great shakes) the precision was amazingly good.
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