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hate to say this daytona 2000, but sounds like a head gasket. That would cause the motor to die at idle. Hard to start because of compression loss. The reason you're hearing it more is because the gasket is progressively breaking down. The hissing is compression passing through a small space, ie headgasket.
Check your coolant , if ok get a compression and leak down test done. The leak down test will pin point any combustion issues if indeed it is the head gasket.
 

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not quite that easy, thought I would share a little info on head removal. Re-sealing the sleeves is highly recommended. the 955i uses ThreeBond 1215 as a sealer.The engine 885cc used Hylomar. Even if you are very carefull not to turn the engine over with the head removed, there's no guarantee that one or more of the liners has a damaged seal. When the head is lifted clear of the locating dowels the liners can stick and partially lift, inturn damaging the semi-flexable seal.
You may get it back together and experience no leak.
If it does leak, you will have to do the whole job again plus the cost of another head gasket. Not worth the risk.
To make matters worse, when you do go to remove the liners you may find that they are very secure. The ThreeBond grips far more effectively than the Hylomar, but it may still leak. The only and correct method is to use a liner puller. Sometimes I have noted that with the liners removed for resealing, the seal in places was very thin but still hard to lift, even with the correct triumph puller, others have been very easy to remove with hand lifting pressure only, and would have leaked for sure.
If indeed it turns out to be the head gasket, you will have to make the 'call'. Re-seal or not. What ever you do don't allow anyone near the cases with a welding torch offering to loosen the liners. They are a hand slip in fit. Heating achieves nothing but potentially set fire to the bike or at least damage the paintwork!
 

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good news on the coolant. Fingers crossed its not the gasket. Once the leak down is done you will have more answers. Have you been looking around for any other obvious causes in the meantime. With the tank off you could check for a loose, cranked or missing vacuum line from around the inlets,throttle bodies,stepper valve and fuel pump regular. Also check the air pressure line from the air box to the ECU. An air leak will cause the engine to stall. The hissing could actually be vacuum leaking.
If you have the fuel vapour canister as part of the emission control check the air lines there too. If you have this it will be found under the fuel rail, and it has Honda on it :)
The puller was nearly $700NZ
Cheers
 
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