SOHC.co.uk Forums > CB750

1&2 not firing.

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mick:
Hi Andy how you getting on with 750?

Andy1976:
To be honest mate I've not really been near it. It's starting to get me down a bit. I may have an hour or two on it tomorrow once I've got the grass cut. The bike really needs a full strip down and everything cleaned up. It will give me something to do over the winter months I suppose.

Andy :(

Yoshi823:
I use a leak down tester to check where the problems are.This 'Sun' item compresses the relevant cylinder to be tested via the spark plug hole with the valves both closed.Then I listen out for escaping air in the airbox (inlet valves),the exhaust pipe end (exhaust valves) or the oil filler cap (on a 550) or a tappet cover on the 750 for there to be heard air escaping meaning a piston ring problem.The leakage is measured using a dial to see how the other cylinders compare.

But in this threads case it sounds more like carbs, as the fine sediment can get past the filters and is more likely to do with leaving the bike on it's sidestand is the reason why it started with cylinders 1 and 2,thwn number 3.
Check the primary jets as well as the air screw drillings.Clean using carb cleaner spray,easily available from Halfords.

As far as the dust in the tank is concerned,I made up an adapter from the house vacuum cleaner and connected it to the tank...and gave it a good shake about.Job done.

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