SOHC.co.uk Forums > CB750

Starting Problems

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jerbear48:
Thanks for the info guys. Does the air box need to be fitted or will it run without it 

UK Pete:
No it should start without the airbox
Pete

jerbear48:
Hi All
        Tried to start it by spraying easy start into the carbs and notice that the vapour was not being sucked in as expected but being force out so I am thinking the valve timing could be out by 180 degree's. Any suggestions would be very much appreciated

tom400f:
I'm not sure that could be the case without there being serious consequences of pistons meeting valves but you can check by taking the tappet covers off and looking at the ignition timing marks under the points cover.

When 1/4 are at TDC then 1 will have both valves closed and 4 is on the exhaust stroke and its exhaust valve is (I guess) all but closed.

Ok I'm assuming its all similar to the 400f and by 1/4 Honda mean 1 is firing (it could be 4)

UK Pete:
If the inlet valves are not seating on compression stroke then it will blow out the carb like you describe, check the tappet gaps, as well as the valve timing
Pete

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