Hi, hoping for some guidance. We have been working on a monster 695 which was crashed and then sat for some time. Long story short, it’s gone from very bad, to engine running and most of the bike is now new. We’re having an issue with the part in this photo. Where the rubber joins the metal part of the inlet manifold it seems to be momentarily separating once the bike is warmed out and letting off quite a loud pop. This confuses me because that suggests to me that there is pressure in the manifold and I thought that a naturally aspirated engine like this would have at most atmospheric pressure or most likely, vacuum. I’m assuming the rubber and metal bits should be fused and so there is an issue there that needs rectifying but I’m concerned by what is causing it to blow open. Can anyone explain what is going on here? For info, I did a compression test and the results were circa 100 on both cylinders. Injectors and bodies have been replaced.
It's back firing, most likely down to excess air getting in through the rubber. That's shot... the bonding between the rubber and alloy has failed, and needs replacing
Thanks for the very quick reply. I feel a bit more relaxed about it now as my fear was that the valves weren’t seating causing gasses to get forced up the intake manifold causing a pressure build up and ‘pop!’. Is it normal that it would get worse with a hotter engine? Do you suppose that a screw down metal clamp (like the one above) would solve the problem?
So it pains me to say this but we had to give in and get it shipped to a specialist. They’ve just called and advised that the timing on the horizontal cylinder was millimetres off which was causing the intake valves to lag ever so slightly. I used the marking belts and pulleys and counting teeth method and must have got it one tooth out or something.
I’m only updating this incase it one day benefits someone else. It wasn’t the timing, but it is now fixed! After the belts were redone and tensioned, the issue persisted. It was actually happening on both cylinders and blowing the rubber hoses out which needed replacing. That’s fun because it seems to be the one part from Ducati that you can’t get anymore. We found that 696 manifolds fit just fine but there’s an extra theaded hold that needed blocking. The running issues date back to a problem the bike had at introduction back in 2007. Known issue around running VERY lean at a precise RPM and with some deep forum digging you can find evidence of Ducati replacing the ECU under warranty with one from a 1000 Multistrada (it may actually be the same ECU from the 695 termi kit). That isn’t an option anymore and second hand ECUs are apparently useless without the ignition barrel and red key. Power commander doesn’t make a piggyback for the 695 either! Eventually, right at the point of giving up, the garage that, ten or so years ago was actually a Ducati franchise, found an old diagnostic tool in a dusty cupboard which happened to have a service update for the 695 Ecu loaded and ready to ‘remap’. This was done, road tested and all good.
