Honda-SOHC

Excuse me sir, do you know how fast you were going?

Err, no officer 

Clutch switch?

And solutions

When I did my American imported 750 last year, I just used the dating Cert from VJMC and didn't need the additional letter from Honda

Same here

Motobatt batteries are a pain in the arse. I have had a couple replaced under warranty on my Fireblade.

If they go flat they never seem to fully recover afterwards.

The only way to use one successfully is to have one connected to a trickle charger when not in use.

This is what I did, modified the mounting plate with the reg/rectifier mounted flat to it with a new style fuse box above.

Works a treat and doesn't get warm, and the side cover still fits.

Right, you are all going to think this is my imagination and i'm going crazy but here goes:

74 CB550, has electronic ignition and a solid state regulator / rectifier all new. New bog standard lead acid battery.

Bike starts on the button, rides fine.

If I don't use it for say 2 to 3 weeks, when I put the key in the ignition and turn it on (just on, no attempt to start it), the bike makes a brief hiss then wont do it again.
Bike fires up perfectly, idles fine, rides fine.

The hiss noise will not come back for a least a couple of weeks if the bike is not used.

Hiss is nothing to do with the fuel tank, petrol tap is off when it happens.

Just wondered if there was some kind of valve in the battery maybe to release pressure?

It sounds like it comes from below the seat so i'm thinking battery. Battery is fine, holds a charge.

Please, no Snake comments 

I'm not allowed near the appliances since the missus found a cylinder head in the dishwasher