Build ideas

[ImpulseRocket89]

Yeah I’m just trying to figure out the best way to do that

A file and a bunch of patience.

 

[Chainlube]

Yeah I’m just trying to figure out the best way to do that

You'll need a combo of tools, a thin cut off blade on an angle grinder and a couple flat files and a round file. Measure your axle and compare it to the dropout, divide the difference by two and draw that out on the top and bottom of the dropout.

If the axle is 3/8" and the dropout is 5/16" then remove 1/32 from top and bottom. In that case I would just file it, I'm not against a little hand labor.

If the axle is 1/2" and the dropout is 3/8", then you have to remove 1/16" top and bottom, that's where the thin cut off wheel comes in handy.

 

[Zoom555]

You'll need a combo of tools, a thin cut off blade on an angle grinder and a couple flat files and a round file. Measure your axle and compare it to the dropout, divide the difference by two and draw that out on the top and bottom of the dropout.

If the axle is 3/8" and the dropout is 5/16" then remove 1/32 from top and bottom. In that case I would just file it, I'm not against a little hand labor.

If the axle is 1/2" and the dropout is 3/8", then you have to remove 1/16" top and bottom, that's where the thin cut off wheel comes in handy.

Thanks! I like the idea of using a file. It’s pretty cold here so I’m gonna wait till it warms up a bit to measure everything out and start filing!

 

[Chainlube]

Thanks! I like the idea of using a file. It’s pretty cold here so I’m gonna wait till it warms up a bit to measure everything out and start filing!

Just be sure to draw a line top and bottom of where you want to file to, so it's even and balanced. It sounds labor intensive but goes rather quickly once you have everything measured. Good files are a must.

 

[Zoom555]

Just be sure to draw a line top and bottom of where you want to file to, so it's even and balanced. It sounds labor intensive but goes rather quickly once you have everything measured. Good files are a must.

Yeah exactly! Measure if is gonna be the most crucial part of the process.

 

[Chainlube]

Yeah exactly! Measure if is gonna be the most crucial part of the process.

I had the most uneven dropouts on a bike ever a few years back, I had to use my round file in the end of the slot just to get the wheel aligned.

 

[cloakedvillain]

I really haven’t considered the 79cc. I read they are kind of slow for what they are, but I have no experience with them either. I don’t know how available parts are for the 79 but the 212 has a huge selection because it’s popular with go karts.

But you’re right it may be cheaper and easier to go with a smaller engine.

The predator engines are for industrial uses like a conveyer, fan, pump or compressor. And as such they as mechanically governed at 3600rpm with a one to one ratio on the pto. Some guys will remove the governor but I can't recommend it. These engines are design to be run at 3.6k for tens of hours between service intervals, not 7.2k at tens of minutes. I have seen guys use a gokart cvt but it requires a space on the pto and I don't trust it.