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Old 04-29-2019, 10:52 PM
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Default 30 series bushing

I just took off the 30 series driver off my megamoto mm-b212 minibike. It has two bushings, the usual brass ring but this 30 series has another one that fits over it.

I have never seen that, I always just see it with the brass ring.

I am assuming that it is here to shim the belt?? This bike is running a jackshaft and not a 30 series back plate.

What do you think?
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Old 04-30-2019, 02:40 AM
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it's not original .. (saw cut by the look of it)

IDK why you want to raise the belt even further..
maybe the PO had troubles getting a good slack in the belt and tried it that way..
or maybe he tried to solve a high idle issue?
since raising the belt slightly increases engagement speed *shrugs*

IDK.. I'd see if I can get it reliably working with just the original one

'sid

PS you said mega moto... that monster moto rename isn't too long ago IIRC;
is that a new bike? if so... for sure keep that spacerbushingthingy handy;
I doubt they couldn't solve idle or distance issues the usual way.
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Old 04-30-2019, 04:29 PM
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Ya Im not sure why it came like this, Ive never seen that. But this is the way it came from the company.

And to verify its not just this bike, I had my friend take his 30 series off (same bike model)....same thing.

That means megamoto is shipping bikes this way.

It hasnt affected riding that I can tell. I actually only saw it when I took it apart to clean yesterday.
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Old 05-01-2019, 07:58 AM
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if it feels like everything is working properly...
frankly I see no reason it couldn't stay where it is *shrugs*

I might see what removing it would do;
if it's better or worse without,
just to see if that'd change my mind about it's necessity..
but if the manufactuer put it there, chances are they have a reason for that

'sid
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Old 05-01-2019, 08:06 AM
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I've seen people adding a sleeve smaller than that on FB groups. They claim they do not want overdrive. Says Overdrive is limiting RPMs (which sounds like more of a sprocket ratio issue to me). I told them to just drop a tooth on the JS sprocket. Will that bushing prevent the driver from closing? Thus preventing the TC from fully shifting?
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Old 05-01-2019, 08:28 AM
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Good catch!

Going by the belt marks on the sheave..
I'd say no it doesn't prevent the belt from reaching full height
but it appears the belt is slipping at overdrive
indeed preventing the clutch from fully closing...

Since that means premature belt wear more than anything else..
I would like to change my mind and say get rid of that bushing!

'sid

PS ah people on facepalm always some sort of ridicule
Yes you might reach higher rpms.. but the speed will be the same or less with that bushing.
since as soon as the belt starts slipping you'd be without transmitted power (engine revs, wheel doesn't care)
what those F(art)B(rains) really want is the speed limiting clutch weights instead
(they can be set to prevent overdrive while still keeping firm belt contact)
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