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Discussion Starter #1
Hi all,

So my sliders are installed - 20g weight (from buggyparts of course) and here is the result....

et voila - lower revs at cruising speed! Which was my main objective.

In a normal tank load, I am increasing my average mpg to around 58 or so from 56 or so. Not a huge difference but here are the important differences:

1) Off the line, and around town - slightly zippier. Not as much as with a Costa Variator (what is?) but slightly more pep. Slightly faster mpg drain out the exhaust too to be fair..!

2) Once up to speed, around 45-50 mph is when you see the real difference - the revs start heading in reverse... Very intriguing!

At a steady 70, on the flat (and here that context is crucial..) I am turning over around 5900 revs. Which is a real difference in the thrashing of the poor engine.

I feel like torque drops off quite considerably, as the rev band is narrower now with 20g weights. I do not think the engine has the grunt to exploit a higher top speed. On a flat, or a downhill, the engine will scream and labour less, which is nicer. Although why you would want to go much quicker than around 85mph in the thing is anyones guess. The engine at least will rev less - but* in a chassis that is about as tough as a cream puff, speed is not the burgman's friend...

*not up a hill - the performance with these sliders deteriorates rapidly going up hills - the torque band has dropped off a fair bit - once you get up to speed, hold the speed if you can, but it will not rev out like the standard rollers.

Overall, despite the negatives, I am very much sold on the 20g weights. Why it doesnt come like this from the factory I do not know.. its far more civilized for my use, and much more peaceful to ride. Each to their own. Personally I recommend it, unless you have a lot of hills - in which case it will drop off performance and mpg.
 

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Cheekygrin73,
I installed the 19 gram sliders on my bike. I really like them on the highway, but it seems the bike has two rpm ranges now: idle and 5-6,000. Whether I do 30mph or faster, the tach reads 5-6k. With the 20 gram sliders, what are you turning at 45-50 indicated, if I may ask? My current fuel economy is about 53-55 mpg, doing basically suburban riding. 40-45 actual the majority, with occasional 70 on the freeway. I do carry my golf bag crosswise, which may increase wind resistance. Anyways, overall I like the sliders. And really like the 400.
 

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I wonder how old your CVT belt is, and what your weight is. I use 19 gram DPS weights and with an old belt (but still within specs), the rpms at an indicated 70 mph were about 5800. When I changed the belt, they dropped to 5300 rpms. With 20 gram weights, I'd expect your rpms at an indicated 70 mph to be down at 5000 or less.

Chris
 

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My bike just turned 4000 miles. I weigh 250. The acceleration is fine with the 19 gram, but I wonder if the heavier sliders would reduce the mid-speed (40-50 mph) rpms. I added a Laminar Lip about 2" above the stock windshield. I turn about 5300 at indicated 70. At 75 it is 5800.
 

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Discussion Starter #5
Just to clarify, my weight 220lbs, excluding all my helmet, gloves, jacket, man-bag and so on in my luggage bay. I have a givi AN266 Airflow fitted (pretty large and not terribly aerodynamic) and its a 2012 with just over 10,000 miles on it now. I estimate around 250lbs including all my crap on the bike and me wearing it.

It really is intriguing watching the speed increase, and the revs drop at the same time.. But no, I dont get anywhere near 5000 revs. Well, say 5800-5900. Its difficult to tell as no part of the Easy Bay highway network is flat.. minor roads yes, but those are not posted fast enough. And die Polizei are everywhere here.. not that anyone gives a frak about them judging by everyones speed and the number of pulled over cars here..
 

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At 5900 rpm and 70 mph you are likely in as high a gear as it will go,
yours is a post 2009 scooter and Suzy changed the gear ratios in the
box to make them rev higher, and upped the rev red line to compensate,
mine is turning about 6000 rpm at 70 so in the same range.
 

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Cheekygrin73 said:
Just to clarify, my weight 220lbs, excluding all my helmet, gloves, jacket, man-bag and so on in my luggage bay. I have a givi AN266 Airflow fitted (pretty large and not terribly aerodynamic) and its a 2012 with just over 10,000 miles on it now. I estimate around 250lbs including all my crap on the bike and me wearing it.

It really is intriguing watching the speed increase, and the revs drop at the same time.. But no, I dont get anywhere near 5000 revs. Well, say 5800-5900. Its difficult to tell as no part of the Easy Bay highway network is flat.. minor roads yes, but those are not posted fast enough. And die Polizei are everywhere here.. not that anyone gives a frak about them judging by everyones speed and the number of pulled over cars here..
It would be helpful if you also add where you live on your -profile... BUT at 220 lbs +.It is like riding with 2 people all the time....!! OR at least 1 person and a large dog........LOL!! Personally - I just enjoy riding my "Ingrid" Burgman.and don't worry about RPMs of fuel mileage at all............ :thumbup: :thumbup:
 

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here is the Stock Report:

http://www.beedspeed.com/html-pages/var ... -chart.htm

Burgman 400 K7: Stock 26X13 26Grams - 26,1X12.8 8 Rollers Or Sliders

26,Grams is very Heavy which Means "Slower Take off Speeds ,But Higher Top End Achieve Speeds 100 MPH -Easy

12,Grams which my Polini Variator came with 8 12,Grams weights Lighter "Faster Take off Speeds, But Lower Top End Achieve Speeds Less then 65 Mph -Struggle

from what i see of the Dr.Pulley the Lowest Made is 16,Grams -right in between Easy & Struggle But Still Kind of Slow to Top Speed Achieve Speeds Less then 80 Mph

onless you Special Order them.

Elliott,
 

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Stock rollers on later 400's are 19g my 2010 as them or had till I fitted sliders.
 
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