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Dr Pulley question plus driving observations

3679 Views 29 Replies 14 Participants Last post by  Yosh70
So am now up to 9100 miles.. rear tyre is flattening out. Seems reasonable mileage, will change at 10,000 which is pretty good for any bike tyre. May as well opt for the same or michelin if in the price range - its just a workhorse, dont need anything too low-end, or anything too sporty. Sport-touring if you will, with good slow wear rate.

Anyways, I got my Dr. Pulley sliders through - 20g weights. Anyone run these, what mpg do you get and what rpm do you have at 7000?

On the standard set up, I pretty much run equal mph and rpm from about 45-50mph. Probably because I am over 200lbs.. I never seem to get much more than about 56mpg with my AN266 Givi fully extended - worse than that in Winter it seems.

I got the 20g weights as I was looking to increase my mpg a fair bit (I am not looking for pay back on fuel savings right away!) but more for the lowered screaming of the engine at highway (highway plus ahem...) speeds and more settled drivetrain response.

additional question other than to those who also have 20g weights - does this give a higher top speed? I am not sure I want to explore that...

Why? things I notice riding the bike hard - torsionally it is not very stiff. It corkscrews a fair bit and the forks also have a bit of slop and wander - amplified when the frame is bucking and weaving at high cornering speeds on a bumpy highway.

Not enough to warrant a steering damper, but enough to notice the limitations of the materials and design - yeah, its just a scooter.. so long as it is steel and this flexing does not fatigue it beyond design basis too quickly then whatever, really..
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I tried a 21g and 23g weight once. Acceleration with the two was down. MPG looked like it would be fantastic with the 23g and just better with the 21g weight. I didn't leave the 23g weight in for longer than a few miles. It was like constantly having a car in too high of gear all the time. I didn't believe the vibration would be good for it in the long run. I find the 19g weight has me at 5300 rpms at 70 mph indicated on flat roads with no wind. The 18g weight is at 5800 rpms.

I've kept records of both bikes, so there's about 75,000 miles of similar riding to compare. Even with the OEM weights being 1000 rpms higher generally, the MPG in the same situations hasn't really changed except for summer/winter gas variation between OEM weights and 18g and 19g DPS weights. What you do get for advantages is better acceleration and a more relaxed feeling when cruising with the lower rpms.

I also noticed something when I did the SS1000 last year. I had in the 19g weights then. MPG went down when my speed got up to 75-80 mph (gps, not indicated). Why? Because you're still pushing a brick through the air and the air resistance is like a hand holding you back. I don't think you'll hit redline, or any higher mph at top end.

One of the things I noticed when I bought my 2008 400, is that it is less settled than the 2007 400 was. There were times when I had just sold the 2007, that I wished I had it back. You would think the two bikes would be the same, but they aren't. I like the 2008, but it is just like you describe. Get on a bumpy road at 90+ mph, and the bike loses its composure. Of course I've only done that once in a few minutes of stupidity, so it isn't worth worrying about. Nor do I intend on doing it again.

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TwoWheelTim said:
...I have 18g DPS and like them a lot. 6900 RPM and I am going 70 MPH actual. Fast as I want to go on a scooter on public roads. Your MPG sounds pretty decent though. I have a lifetime average of 59MPG...
You might have the DPS weights in "wrong". Or you made a typo. Even if you weigh over 200 (and I'm not that much lighter), you should be at about 5800 rpms. Maybe a couple hundred higher with a worn belt.

Here's a link to a post with pictures of the "wrong" way versus the correct way to install the DPS weights. I put "wrong" in quotes because it isn't a bad way to install them at all. I rode like that for months. Acceleration is great and the weights will move the rpms up with any load increase on the bike in a moment's notice. It felt to me, like I had added 100ccs to the bike. With a load, the rpms would jump up like you wrote, to about 6900...and then accelerate fast from there.

The first time I did this totally surprised me. I opened the throttle to merge into the freeway traffic. Rather than just the normal surge of acceleration, my head jerked back and the bike leapt forward! Then it felt like someone shifted and the acceleration kept going even more. I had the biggest grin on my face while trying to watch some heavy and fast moving traffic all around me. My disappointment was that I had car bumpers too close and couldn't explore this new behavior of the bike. My reason for changing the DPS weights back to the correct way? I knew this was going to earn me a performance award eventually. It was just too much fun.

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Yup, same here. I've read reviews that question why anyone would want a tach on an automatic scooter. Well, with the 19g weights, the closer I can keep the rpms to 5300, the better the mileage is. Once the rpms get to 6000 or above, the mileage drops.

I know what I see happen. Cliffyk can tell me why. :)

Here's the link. viewtopic.php?f=47&t=57247&p=527799#p527799 I'll go back to the other message and add it there too.

There's nothing wrong with 18g DPS weights. I just prefer the 19g weights. I don't drag race with the bike, and the 19g weights will still move the bike fast enough that I get away from traffic easily. And with the 19g weights, my freeway rpms are just a bit lower which I prefer. You won't go wrong with either.

IMHO, no. I've never seen any wear on my OEM sliding pieces, so I don't see any reason to change them.

The weight is only one part of the equation. The Dr Pulley weights are not round like the OEM weights. Even with the same weight, you'll get better acceleration at city speeds and a drop in rpms on the highway.

If you've ever driven a manual transmission car, you've found yourself in the wrong gear at times. Like being in 5th gear instead of 3rd. The whole driveline jerks and vibrates till you change to the right gear or you get up to speed. I got the same feeling when I used the 23 gram weights. Was it something so bad I couldn't live with it? No. But it made me wonder if I wasn't trading the life of something in the drivetrain (probably the CVT belt) on the 400 for a few MPG.

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