Dr Pulley 20x12 14GR

[TANWare]

I just had them changed out at the shop on my 3000 mile service. Now have the first 40 miles on them.

0-60 MPH times with my 240 LBS before was about 10.5 to 11 seconds. Now I just tried it twice and I am 8.0 to 8.5 seconds. Acceleration now is at 6,500 RPM at WOT, before about 6,000. so the advertised performance is definately there. You can definately feel it in the seat of the pants.

Top speed for my short runs has not changed. 92 MPH indicated but instead of 8,200 RPM it was at 7800-7900 RPM but still felt like it could have climbed higher but I ran out of space. It did feel stronger accelerating from 60-92 indicated but too short a run and too much traffic for this chicken little.

Casual riding will take getting used too. Take off is smoother as slightly lower geared but at the same time low speed RPMs are up a bit. 35 MPH steady is now 4,300 RPM where 4,100 would do before. 40 MPH is 4,500 RPM and 4,300 would do before. 50 MPH is 5,000 the same as it would do before.  Now at 55 mph and above the RPM's lower. at 60 I do 5,400 RPM where 5,500 before and 70 is now 6,200 where 6,400 to 6,500 before.

Another note is RPM variation under any acceleration is higher. The bike lets the engine run more freely under 55 MPH so when you give it some of the twist the RPM's climb much higher but you feel more juice under you and the engine does not sound as labored. That is unless you are WOT, then you can hear and feel the higher RPM at full juice.

About the best way to describe it is before the bike was lugging it as much of the time it could. Now the bike sounds more normal like it is not lugging. I am sure though this will affect MPG though. The first tank will be a killer as I have the WOT's etc..

So the jury is out still as I kind of liked it as a lugger. The engine load is quiter now though but I really don't need the extra umph that it provides. So we will see as time progresses. If I do change though DR pulley 20x12 16 gram would be the choice as that should put lower speed RPM's back where they were but still give me the lower RPM than stock at 70 MPH...............

Edit; I should note for those not familiar that the torque curve is rated tops at 6,500 RPM and top HP at 8,500 so as it stands the rollers seem to put the engine at its most efficient RPM values for torque. This again will eat into MPG but you really can feel the difference and the sound with the stock muffler can definately be heard as the engine just doesn't have that straining sound like it is in too tall a gear.

Of course it really feels weird at first. Maybe if I hadn't put the 3,177 miles on the bike before changing it would have felt normal. Also having ridden much larger bikes for so long I am not used to bikes with small displacement engines that require the extra RPMs to be in the pipe range.

[Cortez]

Great info, thanks for sharing!
I'm still trying to figure out if I could live with the DT or should I get the XC500Ri..

[frankiej1949]

Hi Tanware
I presume you are talking about rollers/sliders? Keep us updated would like to know how you get on with it and what effect it has on consumption.
Have a good weekend
Frank

[TANWare]

Yes, DR Pulley slider rollers. I now have 100 miles on them and am becoming more used to the ride. I can say these rollers let the engine run more in the pipe, if you like that.

Below are some video's. in each the last 50-60 MPH were on an uphill so this adds about another 1 second or so to the normal times but for comparison. Just remember I am 240 LBS so the bike is pretty strained.

Once you have buffered both files if you start the DR Pulley video at 12 seconds of the stock video they start off at the same time. The DR Pulley video ends at 23 seconds into the stock video but the stock video goes on to 25 seconds before 60 MPH. So it shaved off about 2 seconds or so.............

[Cortez]

Yes, DR Pulley slider rollers. I now have 100 miles on them and am becoming more used to the ride. I can say these rollers let the engine run more in the pipe, if you like that.

Below are some video's. in each the last 50-60 MPH were on an uphill so this adds about another 1 second or so to the normal times but for comparison. Just remember I am 240 LBS so the bike is pretty strained.

Once you have buffered both files if you start the DR Pulley video at 12 seconds of the stock video they start off at the same time. The DR Pulley video ends at 23 seconds into the stock video but the stock video goes on to 25 seconds before 60 MPH. So it shaved off about 2 seconds or so.............

I can see 6000rpms in the first vid at WOT, what revs are at WOT with the sliders?
The scoot I had for a test ride usually accelerated at 5600-5700 at WOT, and when it DID happen to hit 6000 once or twice the
difference in acceleration was (subjectively) huge.

[TANWare]

6,500 RPM WOT, as mentioned the seat of the pants can definately tell.

As a side note 6,500 RPM is the engines rated max torque curve. What this means is the cylinder per detonation is providing the max efficiency in providing power output. So while a lower slider weight may provide more power to the rear wheel from torque multiplication you are not increasing efficiency.

So with engine mods or further slider mods you may increase performance but not efficiency in power delivery. Now just as in every other vehicle increasing to the optimal point rather than lugging the drive system can eat up MPG. Time will tell on this tough............

Edit; Scooters CVT's are a bit different. The 0-35 to 40 MPH is the time it takes the variator to settle out and RPM's to lock in. You will notice only a slight improvement in that range. Beyond 40 MPH is where you start to see a big difference. Now this is more true then of roll on performance as the CVT is already preloaded and the engine already at rev's from any speed. So this is where the sliders really start to shine as well.

If you are already at 40 and need to get to 65 MPH to pass on a roll with the sliders will get you there WAY quicker. Also remember this too changes the way you ride. Where you wouldn't have used the gas before to pass that truck you now will. Again eating up MPG. So it is not just the mechanical efficiencies at work eating fuel but the inevitable riding changes because of capabilities that actually will have even more of an impact..................

Edit 2; Where I could be on the 50 MPH highway before behind a slow vehicle in the slow lane I could easily change to the speed lane and pass them. Now I can change to the speed lane and somewhat blast past them. It still is no motorized missle, but there is a significant improvement............

[Cortez]

6,500 RPM WOT, as mentioned the seat of the pants can definately tell.

As a side note 6,500 RPM is the engines rated max torque curve. What this means is the cylinder per detonation is providing the max efficiency in providing power output. So while a lower slider weight may provide more power to the rear wheel from torque multiplication you are not increasing efficiency.

So with engine mods or further slider mods you may increase performance but not efficiency in power delivery. Now just as in every other vehicle increasing to the optimal point rather than lugging the drive system can eat up MPG. Time will tell on this tough............

Edit; Scooters CVT's are a bit different. The 0-35 to 40 MPH is the time it takes the variator to settle out and RPM's to lock in. You will notice only a slight improvement in that range. Beyond 40 MPH is where you start to see a big difference. Now this is more true then of roll on performance as the CVT is already preloaded and the engine already at rev's from any speed. So this is where the sliders really start to shine as well.

If you are already at 40 and need to get to 65 MPH to pass on a roll with the sliders will get you there WAY quicker. Also remember this too changes the way you ride. Where you wouldn't have used the gas before to pass that truck you now will. Again eating up MPG. So it is not just the mechanical efficiencies at work eating fuel but the inevitable riding changes because of capabilities that actually will have even more of an impact..................

Edit 2; Where I could be on the 50 MPH highway before behind a slow vehicle in the slow lane I could easily change to the speed lane and pass them. Now I can change to the speed lane and somewhat blast past them. It still is no motorized missle, but there is a significant improvement............

Thanks for the info!
I've ridden dozens of scoots, and worked at a scooter shop so I'm very much aware of how stuff works, I was just
looking for some hard numbers which people usually tend to ignore and just say "Yeah, it's faster now!".. which sucks 

The scoot I had for a test ride usually didn't rev over 5700 at WOT, and I've noticed that when it finally DID reach 6000 at around 62mph
it would FLY so naturally I was instantly thinking - lighter weights, but that might make the top speed even worse, and I was not happy with
how high the engine was revving at 75-80mph.

Did you try a top speed run yet with this setup?

It would be great if the CVT on the bike can be set up in a way that it will allow over 6000 (like you have now) at WOT under 60mph,
but bring the revs down by at least 300-500rpms around the bikes top speed, would make it possible to run the bike at high speeds for
longer without having to worry about pushing the engine too far.

I'm still trying to decide if I can live with the DT300 or should I go for the XC500 which again has it's own quirks and flaws (higher weight,
fuel consumption, agility etc.). It's hard to jump from a 70hp bike to a scooter with less then half it's power and I don't want to loose
the touring ability that the higher power bikes have. I'm aware that there isn't much power difference between the DT and XC, but running
the bike at a constant 80mph on the freeway to get to the good roads fast will probably put more strain on a 300cc engine then on a 500cc
engine.

[axy]

I'm still trying to decide if I can live with the DT300 or should I go for the XC500 which again has it's own quirks and flaws (higher weight,
fuel consumption, agility etc.).

You've been deciding for two years now, is there estimated time for completion?

[Cortez]

You've been deciding for two years now, is there estimated time for completion?

The Downtown isn't on the market for 2 years.
I can't buy a scoot before I sell my kawasaki, it depends on that.
I sold my car last month, now the kwak has to go.

[axy]

The Downtown isn't on the market for 2 years.
I can't buy a scoot before I sell my kawasaki, it depends on that.
I sold my car last month, now the kwak has to go.

It was Majesty before DT/Xciting dilemma.

Axy forgets nothing.

 

[Cortez]

It was Majesty before DT/Xciting dilemma.

Axy forgets nothing.

 

Yeah, while the Majesty ABS was available for 51kkn, now it's 6k more, and
since then I've ridden the DT.

[TANWare]

Cruising at 60 MPH the RPM's are 5,500. 65 is 5,800 and 70 is 6,200. Now this is flat cruising you should note the RPM's are a bit looser if you hit the gas and will raise slightly more than with the stock weight rollers to bring up speed or climb a hill etc.

Since our stock rollers are 15.5 Gram if you want stock performance under 50 MPH I'd suggest the 16 gram and slight improvement under 50 go for the 15 gram. Remember the heavier weights will cause the top gear to lock up easier so while cruising RPMs become more leisurly so will top speed acceleration.

Agreeign with cortez, the engine at 70 felt rushed before, 70 feels fine at 6,200 RPM. 75-80 I haven't tried yet but I am thinking at least 15 gram rollers if you plan to do that often. Still a slight improvement on the low end but should make those higer speeds, at least where the engine is involved, happier. I will try it out in a bit and report back.

Short WOT top speed showed also 92 MPH but now 7,800 RPM not 8,200. I have not had a long enough run to see if it would go higher. Now this too was sitting streight up, not tucked in for the run. I am trying to report back all nuances as normal riding would yeild too others.

[Cortez]

Cruising at 60 MPH the RPM's are 5,500. 65 is 5,800 and 70 is 6,200. Now this is flat cruising you should note the RPM's are a bit looser if you hit the gas and will raise slightly more than with the stock weight rollers to bring up speed or climb a hill etc.

That's interesting.. the one I tried had 6000 on the dash at 60..
This sounds great.

And here's my acceleration clip:


This scoot obviously needed new weights and/or belt.

[TANWare]

if the rollers were bad it usually raises the RPM's and the same for the belt. The lighter you are too the lower the RPM as there is less resistance against the variator so it does not pull as tight and the gear ratio does not raise as far. CVT's act differently than a normal trans, but that is obvious. Yours does seem to be a bit low though. Had/Have you calibrated the throttle?

[Cortez]

if the rollers were bad it usually raises the RPM's and the same for the belt. The lighter you are too the lower the RPM as there is less resistance against the variator so it does not pull as tight and the gear ratio does not raise as far. CVT's act differently than a normal trans, but that is obvious. Yours does seem to be a bit low though. Have you calibrated the throttle?

I haven't done anything, it's not my scoot, I had it for a weekend test-ride, put 400 miles on it.
I did manage to make it rev over 6000 once or twice at WOT after getting off the freeway doing
80-85 for like 30 minutes, but once it cooled down it went back to around 5700.