I AM A PROUD OWNER OF AN 07' ZX6R AND AN 06' DUCATI MULTISTRADA S. I'M THINKING OF SELLING THE DUCATI AND BUYING A CONCOURS 14 DUE TO SERVICE COSTS. CAN ANYONE TELL ME WHAT THE VALVE INSPECTION INTERVALS ARE? I'VE READ 15,000 & 26,000 MILES.:dunno
I'm in the States...as you know all we have here is the ZG1400 (Concours). However I am reading the shop service manual I borrowed from my local Kaw dealer. On the Cover it says ZG1400, GTR1400, Concours
It also says 26,000 miles valve clearance inspection.
The European spec. sheet indicates 155HP (114 kW) or 160HP (117.6 kW) with RAM air @ 8800 RPM and 136 Newton meter (100.3 lb-ft) torque at 6200 RPM. The US spec. sheet doesn't contain HP figures and lists 102.0 lb-ft torque. While there is a 1.7 lb-ft difference in the torque section, it doesn't seem to support the valve adjustment interval being cut from 26K to 15K.
My only guess is that the fuel might make the difference and the manufacturer wants to play it safe, but it is only a speculation.
It would be great if someone could provide an educated explanation on this topic.
I suspect that it is a difference in the automotive fuels used in North America vs Europe or other parts of the world. I am pretty sure that in the US and Canada fuel retailers are allowed to inlcude up to 10% ethanol (by vol) in the fuel before they are required to specifically label the product as such. If you look at the gas pump it will actually have a sticker that reads "may contain up to 10% ethanol". I also heard that there is discussion about , in Government circles, to increase this to 15%. I was told by my shop that ethanol is harder on the engines and this may explain the discrepency between the valve interval on US & Canada C14's.
I'm at 15k + miles on my 2011 US c-14. Thinking about going to 20k before I do the valve inspection. As valves tighten I would think fuel mileage would go down, I'm at 48 to 51 mpg now. I use my bike as a commuter 80 miles a day, so riding is consistent for the most part. If the mileage drops I think this would be a good indicator.
I think by the time the fuel mileage begins dropping, you may have already done some damage. Normally valves, especially exhaust valves lose clearance over time due to the unlubricated hammering of the valve head against it's seat. There would be no performance loss as the clearance diminished, and maybe even a slight gain due to increased valve lift, at least until zero clearance goes negative and the valve begins not fully seating or sealing. Also, as clearance diminishes, the valve spends less time in contact with the seat, so the cooling effect of contact diminishes also..