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Post by warpig on Nov 5, 2017 17:17:25 GMT -5
2016 atm50a1a with bbk
about a month ago i broke a belt replaced variator, belt and clutch
last night i rode about a mile and the belt desintigrated
replaced with a new racing variator i had just gotten, a slightly used belt and clutch (less than 2000km on both) that i had from when i installed my bbk until i could get new ones shipped
today took it out for test drive
i got less than 1/2 mile and the belt desintigrated again
what is causing this?
any ideas will help greatly
this is my only transportation
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Post by chewbaca on Nov 5, 2017 18:00:18 GMT -5
I know of two things that can cause that
one is a clogged air intake for the variator cooling fan
the other is a jammed cam in the driven pulley
the clogged intake just cooks the rubber until it crumbles
the jammed pulley will crush the belt with excessive squeezing
so remove the filter from the intake and very carefully throw it away😒 dum things a waste of crummy plastic.
Check the pulley by squeezing the outside sheave against the clutch bell with both hands.
it should open up enough for the belt to drop in most of the way
if it gets stuck .... well say hi to uncle Bob
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Post by lostforawhile on Nov 5, 2017 20:14:55 GMT -5
 there is no "cam" in the pulley, it's called a torque driver, Warpig, what brand of belt are you using? some of the cheap ebay and Amazon belts are known for breaking that quickly, what type of Variator did you buy? if it's a Glixal, throw it away and get a stock replacement style. I've got one of those piece of craps around here somewhere, the drive boss pin will seize, keeping you in one ratio. what weight rollers are in your variator? have you changed the contra spring, or anything in the clutch assembly? how are you installing the belt? removing the outer pulley sheave, or are you trying to pry it on? can you post pictures?
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Post by lostforawhile on Nov 5, 2017 20:20:38 GMT -5
I know of two things that can cause that one is a clogged air intake for the variator cooling fan the other is a jammed cam in the driven pulley the clogged intake just cooks the rubber until it crumbles the jammed pulley will crush the belt with excessive squeezing so remove the filter from the intake and very carefully throw it away😒 dum things a waste of crummy plastic. Check the pulley by squeezing the outside sheave against the clutch bell with both hands. it should open up enough for the belt to drop in most of the way if it gets stuck .... well say hi to uncle Bob the pulley will not crush the belt, it will simply stay in one ratio, and you won't move very fast, there isn't some hydraulic ram in the pulley that smashes things. if the variator pulley has a jammed drive boss or flat spotted rollers, it will simply stay in low ratio and you won't get past a certain speed, if the rear torque driver is jammed, the belt can't move to the center, because the centrifugal force of the weights can't move the belt. again you stay in one ratio. |
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Post by chewbaca on Nov 5, 2017 20:52:56 GMT -5
look I am going to get tired of this nonsense pretty quick.
again you are posting without do diligence
stop correcting me until you can bother to actually be correct
I am talking about a jammed cam on the rear pulley,
the DRIVEN pulley
the variator is the driving pulley
the contra spring is what controls belt tension and the clamping force pressings on the sides of the belt
it does it in two ways, by allowing the belt to move to an area of
the variator with more contact surface and by shifting the drive ratio to prevent high RPM and therefore high centrifugal force
if it is not allowed to perform this function belt clamping force will
grow exponentially compounded by too small clamping area
this does not crush the belt instantly but it does build heat fast enough to cook the belt.
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Post by lostforawhile on Nov 5, 2017 21:18:55 GMT -5
I know exactly what I'm talking about and how it works, if you would shut up and listen long enough, you might learn something, I just carefully explained the effects of both a jammed drive boss on the front pulley and a jammed torque driver on the rear pulley, neither will destroy a belt in a half mile, the belt will stay in a single ratio. Also a blocked air intake is not going to destroy a belt that quickly, you really need to do some research to understand how this CVT actually works, the contra spring only pushes the rear pulley sheaves back together to allow the belt to ride back up the pulley as engine RPM decreases, the variator weights moving up their ramps, move the front pulley halves together, forcing the belt towards the top, if the belt can't move downwards, in the rear pulley, the weight of the rollers can't overcome the contra spring, and the belt stays where it is, it acts like you have rollers that are two light,
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Post by lostforawhile on Nov 5, 2017 21:33:11 GMT -5
here's a video for you, but I suppose they are wrong too
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Post by chewbaca on Nov 6, 2017 1:12:53 GMT -5
I am supposed to shut up?! um no
first of all a torque driver is a word borrowed by go cart salesmen it sounds like torque converter spiffy no?
Sorry its a tool. I have two in my tool bag
and the slots cut in the cylinder of the driven pulley that convert rotational movement to linear movement.
that is the literal definition of a cam.
motor RPM is absolutely not what controls the change in ratio of the variator
In a properly setup variator motor rpm DOES NOT CHANGE
until the variator is maxed out. Only the wheel speed changes that is the entire point of a variator.
I know it's hard to understand but variators do not work like it seems that they do
its backwards
I don't think I am the one that is missing something
ps
belts do not move up and down
it in and out
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Post by cyborg55 on Nov 6, 2017 9:29:48 GMT -5
Stop or I'll do it for you both
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Post by chewbaca on Nov 6, 2017 12:57:59 GMT -5
this is the most relevant vid i could find
i hope it helps
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Sophomore Rider
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Posts: 138
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Joined: Mar 2, 2013 6:30:15 GMT -5
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Post by dyoung1167 on Nov 12, 2017 22:51:57 GMT -5
My first scooter went through some belts. Not as fast as yours but found after buying another and the 2 parked side by side i noticed the one using belts wasn't actually in line front to back causing my belt to have to ride side ways and beat the out of it. whence quick fail.
that said, I think you are using too small of a belt. the very one time mine only lasted that short was when I used a friends smaller belt hoping to get home even slowly. nope. half mile, chunks of belt and string all tangled to .
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Post by tvnacman on Nov 14, 2017 17:33:14 GMT -5
What belt are you using? I had my bout with cheap Charles. Especially with a Big Bore Kit you need a quality belt. How much are you spending on a belt and what brand?
John
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