Honda CB400F oil & fuel?

[rudolph]

I used to have a 1978 CB400F and a 1977 CB750, I used 96 petrol in them and Spectro 20W50 mineral oil,

the 400 was a little smokey, it had a wine in all the gears and made a nunga nunga nuga knocking / flapping sound at idol that was the primary chain.

[HenryDorsetCase]

I used to have a 1978 CB400F and a 1977 CB750, I used 96 petrol in them and Spectro 20W50 mineral oil,

the 400 was a little smokey, it had a wine in all the gears and made a nunga nunga nuga knocking / flapping sound at idol that was the primary chain.

"flapping sound" at idle could also be the cam chain. the tensioners are notoriously shit especially on the 400. they stop automatically adjusting and the bolts strip out and its a major to fix. Its kind of a horseshoe shaped thing to push on the slack side of the chain but mounted on the front of the engine kinda.

http://forums.sohc4.net/index.php?topic=106661.0