Question Please!

Utopiapga

Active Member
The buttons on the rear sprockets are driving me nuts! Is there a way to tighten them up and if so where would I find them? I am going to solid sprockets as soon as I get a few extra bucks can't stand the rattle!!
 

bearman

Active Member
My rear disc had way too much play and rattled some also. It was so bad I honestly thought I would need a new carrier (part that bolts to wheel).

I read on a forum for Boss Hoss scooters that you can just spin the buttons 90 degrees to tighten them up, but I didn’t believe that, it was just way too simple.

I went ahead and bought a new set of buttons from Bigdogpartsking. The new buttons made the rotor like new, I did not need anything else.

When I started pulling the old ones out, they were wore on two sides. So I did try turning a few of them 90 degrees and it did tighten them up quite a bit, but not as good as an entire new set of buttons like I have now, but I would sugest it to anyone as a temporary improvement till you can get some new buttons.
 

Sven

Well-Known Member
I read on a forum for Boss Hoss scooters that you can just spin the buttons 90 degrees to tighten them up, but I didn’t believe that, it was just way too simple
When you have a wear pattern that is oval, both pin and hole equal the elongation in proportion. As in saying, rub both hands together, which hand stayed cold? So as they wear or elongate, you are moving the oval pin 180 degrees and that is back to the round of the pin, not the flatting out or elongation of that pin. But, you did not spin the hole 180 so you are half/worn/half new sides. Not a fix but a band-aid repair.

Same as saying, I have a drive chain that wears the pins on one side as it moves over the sprockets in one direction. If you flip the chain the other way, you now have the round pin that was not wearing. So who now becomes the weak link (or brake disc pin) when you flip chain or 180 a bolt away from the rub?

Replace disc assembly and carrier. Make sense the disc hole is elongated and the pin has close to half to a third the thickness it once had?
 

bearman

Active Member
When you have a wear pattern that is oval, both pin and hole equal the elongation in proportion…..
Only if everything is made from the same material.
The disc is stainless steel and the carrier must be harder than the buttons because I could find no wear on either, except for where the head of the button was hitting the carrier because of the movement allowed by the worn buttons.

…So as they wear or elongate, you are moving the oval pin 180 degrees and that is back to the round of the pin, not the flatting out or elongation of that pin. But, you did not spin the hole 180 so you are half/worn/half new sides. .
I said 90 degrees, not 180.
The pins wear on opposite sides or 180 degrees apart, so when you only spin the button 90 degrees, the carrier and disc are now resting on unworn positions of the pin.

…Not a fix but a band-aid repair….
That is why I suggested it only be temporary.

…Replace disc assembly and carrier. ...
Not necessary. Just replace the buttons. Unless the chrome is peeling off the carrier (like mine is on the front), then it would make sense to get the whole thing new.

…Make sense the disc hole is elongated and the pin has close to half to a third the thickness it once had?
Nope, the buttons on our Big Dogs are solid and only the ends are chromed. All the metric scooters I have looked at have hollow rotor buttons. My buttons do not look to be worn very much, but it is surprising how much movement there was with so little wear. All the metric scooters I have looked at have hollow rotor buttons.

I found the pics of my rotor, they are blurry, but its all I have.
The rotor at rest.


The rotor pulled up.
 

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