Hi. I have a 2022 V7 850 Special (3200 miles on the clock). This is my first Guzzi.
My bike has a throttle flat spot just around 3000rpm. I’ve read about people disconnecting the Evap canister but I’m not sure if that’s the cure for getting rid of the flat spot. If it isn’t the cure, does anybody have any ideas on how to get rid of it? If it is the cure, I assume that I just need to disconnect the pipe that goes to the inlet manifold and plug the open end. Would I need to disconnect the tank breather pipe from the ‘round valve thing’ as well? If disconnecting the evap canister isn’t the mod to fix the flat spot, then what is it for - what does it prevent/cure? Is it a good idea to do this removal mod? Does it cause any problems such as ignition or mixture issues?
Thanks
Tony
I have 2021 V7 850 Special and I’m not aware of any flat spots.
3,000 rpm is 75% of torque according to the specs, but I’ve had it pulling down to 2k without any noticeable jerkiness or great loss of power, so I don’t know what’s going on with yours. As a guide I usually aim to keep it between 3k & 4k. 99% of the time this is good enough for most purposes.
I did do the ‘evapectomy’, or partly, to stop snatching and hesitation just after a cold start.
I just cut the hose below the solenoid valve, leaving it long enough to push a M8 bolt up it. The cut off other end I just left hanging.
The breather hose from the tank, I cut a slit in it to relieve pressure in the tank. The hose not completely cut through. Hope that makes sense.
Thanks Mike. I don’t get the snatching or hesitancy, just that slight flat spot around 3k rpm. Maybe I just need to live with it. When you mention the ‘solenoid valve’ is that the round plastic thing that’s fitted midway along the rubber hose that goes from the inlet tract to the evap canister?
Regards
Tony
Yes it is, front of left side panel.
Your ECU map is different to mine then, else you would have the snatching too, but then you seem to have another problem that I don’t have.
Still worth a try though just in case it does make a difference.
Possibly the valve is opened only at a higher rpm than hitherto, but I’m just guessing.
Thanks Mike