Clutch Problem??? By potwashman (Read 1,092 times)

[potwashman]

Hi, I just need some advice on my clutch.

I have a Superbyke Powermax 4T (HT50QT-31)which has a 80cc BBK. Just put a new belt on last week as the original was wearing a little thin.

Even at just 1000rpm the back wheel still spins round but I wouldn't expect the clutch to engage until over 2000rpm. So when I am sat in traffic and should be idling at 1500rpm the clutch is trying to engage and move me off and wearing out the clutch prematurely.

As far as I am aware it is just the stock clutch & bell from new (4yrs old).

Do you think the springs on the clutch have weakened so that it engages too early?

If so, would I need to replace both the clutch springs & the contra spring and if so, what torque of spring.

Alternatively, on Ebay here in the UK I could buy a whole new clutch assembly (factory standard Boation clutch) for just £22.

As always, any advice appreciated.

Thanks

[Bashan]

So it didn't always engage that early? Then yes, probably one of the tensioner springs has a defect in it. The tensioners hold the pad arms down until the centripetal force forces the pads out. So that is what controls the RPM at which the clutch engages. The weaker the springs the sooner it engages. The torque spring controls how quickly the pulley moves out and goes to higher ratios....so that's not part of the initial clutch engagement. Those springs are a bear to change out although I made a tool to help preserve my fingers. If it was me, I'd get the whole assembly. Pop the nut with an impact, slide it off, slide the new one on and ride to lunch. If your interested, here's the two devices I made for the clutch. They've helped me out several times. Rich

Tensioner Device and Torque Spring Device.

[tvnacman]

I would recheck that the variator roller/sliders are in place , before getting into the clutch .

John

[potwashman]

Thanks for replies. I'll have a look at the variator sliders & rollers tomorrow. If they are OK I think I will order a new clutch assembly. It is something that seems to have been happening for the last 6-8 weeks so I would guess that the clutch springs might have weakened.

Guess I'll have to track down an impact gun.

Thanks again.

[2stroked]

Apr 26, 2014 7:41:45 GMT -6:

Hi, I just need some advice on my clutch.

I have a Superbyke Powermax 4T (HT50QT-31)which has a 80cc BBK. Just put a new belt on last week as the original was wearing a little thin.

Even at just 1000rpm the back wheel still spins round but I wouldn't expect the clutch to engage until over 2000rpm. So when I am sat in traffic and should be idling at 1500rpm the clutch is trying to engage and move me off and wearing out the clutch prematurely.

As far as I am aware it is just the stock clutch & bell from new (4yrs old).

Do you think the springs on the clutch have weakened so that it engages too early?

If so, would I need to replace both the clutch springs & the contra spring and if so, what torque of spring.

Alternatively, on Ebay here in the UK I could buy a whole new clutch assembly (factory standard Boation clutch) for just £22.

As always, any advice appreciated.

Thanks

Umn not to insult you. But sometimes belts can vary in size even when marked with the same numbers. Sounds to me like tge belt is too small/tight causing it to engage earlly. Could be wrong but if this started with tge new belt, check that first. Alsi, make sure the vari wieghts are placed right. Again not trying to offend any body's know how.

[tvnacman]

if the belt was changed without removing the clutch or variator . My money is on the rollers/sliders are out of place .

John

[adamhoyer]

So an 835 20 belt will be made to fit a short case and long case?

[Bashan]

This is a discussion forum, nobody needs to hesitate about expressing their opinion. Sometimes a thread will go on forever and the solution is staring everybody right in the face. Then one guy comes along and boom, they nail it. So everybody should express themselves, that's what a forum is for. Now 2stroked...YOU'RE BANNED!! Kidding. I agree on the belt sizes, they can be off. But still, it comes back to the torque spring and pulley do not engage the bell to the final drive mechanism. It is the tensioner arms that initially engage the variator to the transmission. I would agree that the belt size can affect top speed and initial ratios off the line, but not the engagement RPM. I'm open to debate. Rich

[tvnacman]

Lets see a picture of the belt on the pulleys? If the belt is a little down in the clutch pulley the clutch spins faster than normal.

John

[2stroked]

Bashan, thanks, sum forums are full of @ssholes! Okay, debate time. As tvnacman said if the belt is down to the bottom of the front pulley, it might cause the rear pulley to pickup speed early. Never would have thought about the belt, but I have seen it on other forums.
Next.........

[antdaddy]

Ive had this problem and when I removed the clutch I found two clutch pads that were broke where the springs connect.Changed the pads with some spare ones I had and
no more runaway scooter.

[Alleyoop]

Yes a smaller belt will cause the pads to engage bell earlier. Remember a bigger wheel will turn a smaller wheel faster at a slower speed.
So if the belt is smaller then when put it on What will you have to do, you have to force or open the rear pulley apart so you can get it over the BOSS. Which now the belt is down in the clutch pulley not as high as with a larger belt. So now what happens is at the same rpm the pulley is turning faster due to the belt being lower in the pulley, BDA BING BADA BOOM.
Alleyoop

[tvnacman]

I wonder what he found ?

John

[jvino]

After reading this bashan is wright I don't beleive that anyone is questioning your ability or no how. This sight is made to help work out problems. If some one is upset that there scooter isn't working right it's no ones fault. They are mechanical machines that need attention. I will try to help in any way I can. But bashan and alley have more knowledge than me and not afraid to straight that and even some other people on here.

But welcome to the sight and hope someone gets you all set up to enjoy your scooter riding. welcome

[potwashman]

Hello, interesting points by everyone. Reason for delay is only fitted it tonight. Big Drum roll,,,,,,, everything works fine now, doesn't engage until over 2000rpm now so wasn't a belt problem but was in fact the clutch springs. I've do have a variator pulley locking tool to hold in place so don't stretch the belt when removing but this weekend treated myself to a 12v impact gun (I put a 12v socket on bike a bit back so could plug in solar powered trickle charger). The gun is fantastic and it took just seconds to take off pulley nuts.

I'll be back in touch when I need some more advice, thanks