David
Superbike Rider
Bob's Bike
Posts: 3,824
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Post by David on Dec 3, 2012 15:19:38 GMT
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Post by Lee on Dec 3, 2012 16:23:33 GMT
Bits ordered David, thanks for your help today and for the lift into town. The drive belt snapped yesterday (9k miles) so I can't complain. The replacement one was ordered yesterday but I've ordered a second spare today. They are easy to fit ( arguably at the roadside) so it makes sense to carry a spare. It's entirely possible that a simple belt replacement would have this scooter back on the road in twenty mins but, the slop caused by wear in the variator unit would surely cause another premature belt failure. The lot will be replaced
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David
Superbike Rider
Bob's Bike
Posts: 3,824
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Post by David on Dec 3, 2012 16:51:30 GMT
You're welcome Buddy, if a job's worth doing, do it right.  |
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Post by Lee on Dec 3, 2012 19:43:02 GMT
I've had a good look at the variator unit to figure out how it works, Jacob and I are gonna do some experimenting with roller weights, hot lead and a bench grinder !
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muzzasv
Superbike Rider
Traction control? This is my traction control mate!
Posts: 4,910
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Post by muzzasv on Dec 3, 2012 23:15:34 GMT
variator unit ? is that sorta like a torque converter
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Post by Lee on Dec 4, 2012 21:35:04 GMT
The variator kit is photod in day glows post. The old inner cone has a groove worn into it and the other components look well worn. A new wider belt combined with the fresh cones should see a small increase in the drive gearing, especially with heavier rollers. Hopefully we will see 45+ mph out of it
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booya
Trackday Legend
Posts: 239
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Post by booya on Dec 12, 2012 6:37:22 GMT
A wider belt and heavier rollers will just take the bike below its peak accelerating rpm, changing the rollers will only affect what rpm it revs at when accelerating, if they are too heavy it may not even be able to puch its self to its top speed.
Many people make the mistake of thinking heavier rollers = faster and lighter = slower. Its all about finding where its peak power is and finely adjusting their weights to suit that rpm. Then yoill get a consistent rpm roght through the speed range. Once ypu get to about 40-45 mph the revs will pick up as the transmission reaches its peak rpm/speed range.
Dont wanna seem big headed and arrogant but im a bit of an expert when it comes to constantly variable transmissions.
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booya
Trackday Legend
Posts: 239
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Post by booya on Dec 12, 2012 6:45:49 GMT
variator unit ? is that sorta like a torque converter A torque converter on a cvt is basically the name given to the outside pully of the rear (clutch part) pully. You may need slightly dofferent roller weights for that variator. Upgrading the variator will only see a crisper throttle response and a smoother increse in acceleration. A little tip, of you want a bit more pull off the line id get stiffer clutch springs. Www.adrenalin-pedstop.com is a great site for parts. |
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Post by Lee on Dec 12, 2012 10:45:48 GMT
A wider belt and heavier rollers will just take the bike below its peak accelerating rpm, changing the rollers will only affect what rpm it revs at when accelerating, if they are too heavy it may not even be able to puch its self to its top speed. Many people make the mistake of thinking heavier rollers = faster and lighter = slower. Its all about finding where its peak power is and finely adjusting their weights to suit that rpm. Then yoill get a consistent rpm roght through the speed range. Once ypu get to about 40-45 mph the revs will pick up as the transmission reaches its peak rpm/speed range. Dont wanna seem big headed and arrogant but im a bit of an expert when it comes to constantly variable transmissions. thanks for the feedback. I'd already come to the conclusion that at some point the belt will ride high on the front and low on the back, the lighter the front rollers can be made ( without losing flat out speed ) the better. What I need is a bucket full of various rollers to experiment with. Having looked on YouTube, it seems that 50 mph is possible from this particular scoot with the correct belt, correct rollers, washer removed and ecu looped. I've got 3 different belts ordered but need some rollers now |
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booya
Trackday Legend
Posts: 239
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Post by booya on Dec 12, 2012 17:17:35 GMT
You can mix rollers too, for instance using 3 4g and 3 5g will give it 4.5g (or a little over as the heavier ones are always slightly dominant over the lighter ones. As long as you get the right size you can buy sets of different weights.
Youll only loose top speed if the rollers are massivly out or the wrong size, if theyre too small itll chatter on tick over too.
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booya
Trackday Legend
Posts: 239
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Post by booya on Dec 12, 2012 17:20:19 GMT
You seem pretty intrested in this kinda thing so ill post my project up on here sometime
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Post by Lee on Dec 12, 2012 23:33:47 GMT
You can mix rollers too, for instance using 3 4g and 3 5g will give it 4.5g (or a little over as the heavier ones are always slightly dominant over the lighter ones. As long as you get the right size you can buy sets of different weights. Youll only loose top speed if the rollers are massivly out or the wrong size, if theyre too small itll chatter on tick over too. +1 |
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Post by Lee on Dec 19, 2012 10:24:19 GMT
The drive boss on my boys scooter needs a couple of mill shaving off.
It's a bit of round 20 mill steel about as long as your little finger..just wants a whisker trimming off one end.
Quite literally a 2 min job. Anyone help?
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muzzasv
Superbike Rider
Traction control? This is my traction control mate!
Posts: 4,910
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Post by muzzasv on Dec 19, 2012 16:25:41 GMT
my uncle has 1 mate
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Post by Lee on Dec 19, 2012 21:47:59 GMT
Cheers Luke, I skimmed it down on the bench grinder in the end, it's doing 40 again now
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Post by ZX6-Chris on Dec 20, 2012 14:37:37 GMT
haha you cowboy lee,
where have ya left ya horse lol
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Post by Lee on Dec 20, 2012 23:08:28 GMT
More trimming today, different weighted variator... 43 mph !
Tuning continues, I want to see 45 mph by the weekend
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booya
Trackday Legend
Posts: 239
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Post by booya on Dec 21, 2012 5:10:50 GMT
Stick a 70cc kit on it! Not only is it a 60% increase but the port timings and flow is much more efficient. Should see 50-55 mph without a gear up. The average kit costs like £110.
It is two stroke isn't it?
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mike
Trackday Legend
Posts: 232
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Post by mike on Dec 21, 2012 7:21:27 GMT
More trimming today, different weighted variator... 43 mph ! Tuning continues, I want to see 45 mph by the weekend Fiddle, fiddle , BANG  |
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Post by Lee on Dec 22, 2012 22:45:20 GMT
Ok, the genuine belt turned up today. Prior to this we discovered the scoot was maxed out at 43mph, which, in all fairness is a respectable speed for a moped. Today was about figuring out the best roller weights for acceleration. After mucho monkeying about, we discovered 7.5 gram rollers were the best compromise.
Then the phone rang... It was the scooter shop telling me the original stock belt had arrived. I went to and collected it, then fitted it to the scoot. Jacob said he'd had enough for one day and left me to carry out further testing.
Well ! Despite the rain, on a flat surface, I achieved acceptable acceleration and despite a bit if a wait ... Managed 50 mph !! I'm convinced there was a bit left but I had to jump on the anchors for a speed hump !
If its dry tomorrow, more testing will go ahead where conditions are
years back all our moped were tested on the worsall road ... Ok there's quite a long bank leading to it, but we're talking mopeds here ! A little bit of cheating is allowed ;-) I'm hoping to see 55 mph or maybe a little more!
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