Ultimate Bearing Solution for 4-Stroke Belt Tranny

[michael whiteman]

Two bearings are all you need because they only spin when you are at idle and standing still. Wrench understands how to correctly machine a step to retain each bearing. One could also fab a spacer to go between the bearings accomplishing the same thing. Ya gotta give this kid credit for turning his transmission into a poor man's lathe. Pretty ingenious I thought. Good to hear from you again @Deleted Member 4613. You were an inspiration to me on my transmission.

 

[Chainlube]

Another guy did it wrong again
Others have tried to put bearings in their clutch boar only to have the boar walk on the bearings.

To Install the 2 bearings correctly, the boar should be enlarged only on each end where the bearings go.
This will leave a slight ledge in the boar for the bearings outer race to rest on .
The ledge is what keeps the Boar from walking on the bearings

Cut down the old bushing and make it into a crush sleeve.

 

[Deleted Member 4613]

Nobody is talking about the cost of replacing the battery pack in
EVs, like 20-30K. They all eventually poop out. Imagine waiting
for 45 minutes or 1/2 hour to recharge, and then paying for a new
battery pack every 5 years or so. I don't believe the battery has
been invented today that can compete with gasoline for
convenience. I see electric EVs as largely urban vehicles. But
I have to say my 48 volt electric bikes are sweet. I was lucky
and bought one for $800, battery included, now selling for
close to $1000. Range 25-40 miles.

 

[Karl Snarl]

Nobody is talking about the cost of replacing the battery pack in
EVs, like 20-30K. They all eventually poop out. Imagine waiting
for 45 minutes or 1/2 hour to recharge, and then paying for a new
battery pack every 5 years or so. I don't believe the battery has
been invented today that can compete with gasoline for
convenience. I see electric EVs as largely urban vehicles. But
I have to say my 48 volt electric bikes are sweet. I was lucky
and bought one for $800, battery included, now selling for
close to $1000. Range 25-40 miles.

I can get around 250 miles a tank for the same price on a gas bike.

 

[Nirve]

What @Wrench says.
I also tried this two years ago when I first started building a 4 stroke. Then my clutch bell started wandering off, exactly like Wrench said.
I think it is possible with Wrench's way but I don't believe you can do it in your backyard without correct tools like a lathe?



Anyhow, after the bearings failed, I tried to polish the inside of my bell housing shiny like a mirror, expecting it to glide smoothly until the end of the universe, only to learn the opposite and about the honing effect.

After all, the best way is to ditch the china clutch bell and get the real ghost racer clutch bell (sold out now). It is painted inside in a way that holds the oil for a good 100 miles, together with the oilite/bronze bushing. Alternatively, I would sand the inside of the china bell housing with maybe 600 grid sandpaper to give the oil something to hold on to.
I drilled a tiny hole in that which allows me to put a drop of oil in there every 50-100 miles, and soak the bushing completely only every few hundred miles.

That was two years ago. A real fix is investing in a grubee engine+trans

 

[Deleted Member 4613]

It sounds like you didn't press fit the bearings, which should keep
them from wandering. Did you press fit the bearings? It's a very
precise process, and I think it would work if correctly done. The clutch
bell shouldn't wander. I installed an Oilite bushing and used an Oilite
washer to hold the position of the clutch bell. The tension on the
belt doesn't allow much wandering also, if done right. The only question is
will the bearings in the bell wander when press fit, and this may
depend on how well they are press fitted. I think it could work.

 

[Deleted Member 4613]

There's maybe one more point about press fitting
which I don't have the answer to. The heat
generated from the motor may or may not
loosen the press fit. I don't know.

 

[Nirve]

I think press fit would do the trick. To obtain a proper press fit though, I think you would have to machine it to correct tolerance and roundness. A dremel won’t do?

@Deleted Member 4613 only my clutch bell started wandering because I didn’t think of what Wrench said. He is right:

Another guy did it wrong again
Others have tried to put bearings in their clutch boar only to have the boar walk on the bearings.

To Install the 2 bearings correctly, the boar should be enlarged only on each end where the bearings go.
This will leave a slight ledge in the boar for the bearings outer race to rest on .
The ledge is what keeps the Boar from walking on the bearings

 

[Deleted Member 4613]

There's one more idea here: Rather than using bearings, if the
housing can be honed to 21mm dia., a dry oiless bushing might
be possible, like this one:
https://www.mcmaster.com/2706T548/
No lubrication required.

 

[DieselTech]

I'll be the smart azz!!! Here is the ultimate bearing solution. After trying & reviewing about every trans out there, I've come to the conclusion that grubee is the best. The only trans I havent been able to get my hands on is the grubee skyhawk 2 speed gear driven trans, I believe that's the right name. I feel bad for the guys that are going thru this trans problem with the bushings. I about pulled all my hair out b4 moving on to the grubee 4g-1b, which if hills are needed to be climbed, this is your trans. Its alot lower geared than I was expecting, they need to come out with a 90 tooth driven pulley for these trans would be ideal i believe.