Increase of RPM at Speed - Sliders?
Took a nice four hour day trip today in great weather - a nice break from the daily commute on the Burgman.
Back in May, I had some 19 gram sliders installed. After reading on the forum that others had knocked off the sharp edges of the plate during the installation, and in so doing, had not had the problem others had had. Some of you didn't knock off the sharp edge and it dug into the sliders and gradually reduced the weight whereupon you lost the advantages of the heavier weight. I had the work done at the local dealership - and even gave the mechanic a copy of the parts with instructions to pass a file over the edge a few times.
Since most of my riding is daily commuting (stop and go with some highway stretches) but not extended cruising as I did today. I noticed that when I first installed the sliders, the RPM was about 5,200 at indicated 70 mph. Perfect. Today, most of the time 70 indicated was a thousand RPM higher - at 6,200.
The first suspect was the sliders, of course. But, some other things happened that made me wonder. By the way - the trip was on very flat terrain. (There aren't any hills in deep south Texas - just a few places that are a few feet higher than others.)
* Sometimes, I would be a 70mph and 6,200rpm - then a car would pass and I would be in dirty air - and the RPM would lower to 5,500 or so. It was more than the drafting affect because the lower RPM would last a lot longer than the dirty air. Five minutes might go by before the RPM went back up.
* A couple of times, for no discernible reason, the RPM would change - maybe drop 800 rpm.
* I wondered if I was just riding into the wind - if that was causing the higher RPM. NO - checked it. In fact, it didn't seem to have much affect either way.
* My gas mileage has dropped a little as of late - maybe 2-3 mpg.
Otherwise, the scoot ran fine, though I have noticed a little vibration at 6,000 - the kind that comes and goes in waves. Nothing bad - just never noticed it before.
Most of you will state the obvious and tell me to look at the sliders - something I cannot do but will entrust to my Friendly Local Burgman Mechanic - otherwise known on this forum as BigPhillip79. Anything else you can think of besides the sliders?
- - - -