2001 996 Help

Thanks for the confirmation, however, I will distance myself from the naked flame approach

 

Any marks on the belt have been put there as an aid by someone who replaced the belts and will be of no real help in checking the belt timing. The timing should be checked by lining up the dot on the bottom pulley with the line on the engine cover. At this point the dots on the cam pulleys should line up with their respective marks on the cylinder heads. The horizontal cyl will be at TDC at the start of the firing stroke with both valves closed and the vertical half way down the inlet stroke with the inlet valve fully open.

 

I've the performance bikes guide to changing belts, may help eliminate timing (pm me if you want a copy) but as others have said if the belts jump a tooth or 2 valves go through the piston and you'd know

 

Somehow you need to get a fault code diagnosis off the ECU, the failure you describe could be one of the sensors going down and if so it will register in the ecu. I had similar issues when the Absolute Pressure Sensor went wrong (748) but it only did it on really hot days, engine died, cut to one cylinder then cut out completely. It looks to me that you have checked the set up of everything that usually goes wrong. Start with the pressure sensor connector by the front rhs of the fuel tank by the steering damper, when the rubber boot splits (all of them do eventually) it lets water into the connector and will cause white oxidization of the contacts, you will see if water has been getting in there. Also check the condition and security of the coolant temp sensors connectors and the air temp sensor connector under the headlight.

 

surely these sorts of faults would stop sparking and or fuel, thought he believes it is sparking and fuelling?

 

No, they will alter the amount of fuel being injected. Possibly much too rich or too lean to allow combustion but even then I'd expect to hear some sort of pops and/or bangs. The coolant temperature sensor is even more likely to create this kind of fault.

 

Yes, it’s odd there are no signs of life at all

 

If I shorten the exhaust pipes on a bike, what effect will it have on the engine.
Looking at a cafe racer project and one of the obvious mods is to cut the pipes back.

 

Hmmm, I did wonder if the fact you were giving it some when you lost power was relevant.
I'm guessing you've bent some valves

 

That's fooked!!

 

I'm trying to figure out how it managed to bend the valves on both cylinders simultaneously. A desmo engine won't allow valve/piston contact by over revving and it's extremely unlikely that both belts would jump teeth at the same time. Perhaps they weren't timed correctly in the first place?

 

Ouch, I feel your pain.

 

Indeed, commiserations. I had a belt go on my 748 and bent a couple of valves, from memory they were about 120 quid plus VAT each!

 

New crank then??

 

You can download it from my dropbox https://www.dropbox.com/s/no0kwbv17x6srlo/996.pdf?dl=0