BANG! PsssSSS... Vroom...

[Harold_Shand]

Much as the above. First time I turn the engine over in the morning there is sometimes a bang and seizure.

I press the ignition button again and now I can hear air hissing, it gets more forceful and then the engine starts. For the rest of the day it is as sweet as a nut & will start on the button ( even after 8 hours of sitting idle ).

I'm no expert, could this be something sticking to the inside of a cyclinder, so when the piston jumps up it gets stuck. Then when the ignition is pressed again, the build up of air pressure gets it past the obstruction?

At my last service I was told that the Inlet rubbers will need replacing soon as they are cracking up. What the fuck do inlet rubbers do? Could air be escaping through these cracks causing a loss of compression? Bike is a 94 Diversion with 18k.

Cheers
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BCF's 6th favourite poster 2009-2010

Harold_Shand's theory might be the best explanation.

[stinkwheel]

Well, inlet rubbers create a gas-tight seal between the carbs and the engine. If they crack too much, they leak air. This would cause uneven idling, uncontrolled revving up and a lean mixture. Doesn't sound like your problem.

An easy way to test if they are leaking though. Get it started and idling then spray EZ start or WD40 over the rubbers. If it revs itself up a few seconds after you do this, they are leaky and need replacing. (do this with a relatively cool engine, spraying aerosolised ether near a hot engine is not a good idea).

As to the hissing? Do divvys not have a fuel pump? Could it be something to do with this?

I very much doubt it is something inside the engine itself. If something was sticking as you try to start it, it would most likely tear itself apart when it starts running at several thousand rpm.

[Kickstart]

Hi

Suspect it is doing the same as mine used to do occasionally and dump the contents of the carbs down the inlets. You hit the starter and the fuel runs into the combustion chamber and hydraulics locks a cylinder.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Paddy Blake]

Be carefull if it is hydraulic lock it can bend the conrod.I would leave
it over night and in the morning take out the plugs and turn over
the engine to see if it spits out petrol from the plug holes.

[bish777]

when you leave the bike, set the fuel tap to OFF

sounds like your float valves are fooked.
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GSXR1100J

[Kickstart]

[Harold_Shand]

Thanks chaps. I'm taking it to a garage, but it's good to have an idea incase they start saying top end rebuild and the like...


____________________
BCF's 6th favourite poster 2009-2010

Harold_Shand's theory might be the best explanation.