A Side Project

The_Aleman

Well-Known Member
Joined
May 2, 2007
Messages
880
When in doubt, there's always grinders! Steady now..

Edit: when it comes to jackshafts, I've found some advantage in going with smaller chains. Not only can you achieve ideal ratios easier, but the smaller chains work better on the small sprockets. It's pretty easy to find #35 and even #25 or smaller sprockets depending on how much of a base diameter your jackshaft is. I have a 9T #35 on a 5/8" shaft, I think an 8T is possible.

Anyway, guys have been utilizing go-kart and go-ped resources and adapting them to our things for some time, when you get down to it, there's a lot of awesome possibilities. I've spent many an hour playing with the good ol gearratio.exe that's available on this site.
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AutOtaku

Member
Joined
Nov 24, 2015
Messages
111
Got out today and tried to figure out the mount situation I was going to use. I've thought about just welding the bike tubes to some steel plate but then I started looking at the Chopper mounts for these engines and well, what better option than that? I could, of course, just buy one of those mounts and just put it on the minibike's frame but why would I do that if I can make one and learn something along the way? I took a piece of foam board I had lying around and mocked up a VERY ROUGH estimate of how I want the mounts to look (Keep in mind that I am NOT and engineer, I'm a game designer actually). I want the engine to sit somewhere in the middle under the gas tank and about 3-4 inches off the floor plate, so i made two small triangles that would be the standoffs for the mounts. As for the mounts, I just traced the front engine mount plate and will make those out of steel as well (I measure it up with the rear mount to make sure it clears everything back there and it does). As for anouther the dilemma, I plan to reuse the original fuel tank because I want to keep the fake chrome gas tank. The issue here is that the hole for the fuel petcock is up at the highest possible position in this tank (what a f*cking stupid place to put it), does anyone know how I could seal this off? Would RTV silicon and/or a piece of plastic stand up to gasoline? The last picture is the location I want to tap my own hole for the fuel.
Pictures of everything are below:
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AutOtaku

Member
Joined
Nov 24, 2015
Messages
111
(((Sorry for spammy updates but I've been working on this deligently)))
The weather was nice today and I didnt have to work so I decided to get somethings done. Firstly, I ground off some of the old mounts on the frame that would get in the way of my mounting system. Secondly, I cleaned out the gas tank and drilled a new hole for the fuel petcock that came off my china girl gas tank. I still have to seal up the original fuel petcock with gasket maker. Third and finally, I went ahead and mounted the throttle grip/kill switch from the china girl, I really wanted to use the chrome twist handle but its just a hair too wide for the china girl's housing.
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AutOtaku

Member
Joined
Nov 24, 2015
Messages
111
Over the weekend I found some metal (Laying under the shed attached to the garage under my brothers '49 Chevy truck), Acquired a 5/8 in shaft to make the axle (I'm just gonna bite the bullet and weld both sprockets to it when I get them cut to size), and went today to cut the metal out as well as picked up two 5/8in pillow bearings (f*** man agri supply is one hell of a store). I wanted to get everything welded today but the only welder I have access to is my fathers and he is out of gas, so it will most likely happen next week. If i do get it together next week, I may try and take it to Mini Mayhem at Busco Beach (
here is last years event).
As a side note, I have also been working on my brothers mini crotch rocket that matched my chopper. I pulled it out of the shed and after trying to figure out why the back wheel had locked up, I determined that it was a clutch arm that had sheered off. Ordered and installed a new one and it sort of runs, I think I need to take the float bowl off and clean it/unstick it. Anyway heres pics of both

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AutOtaku

Member
Joined
Nov 24, 2015
Messages
111
I went to a friends this past saturday to work on his "Racing Mower" (Some generic 80's lawn tractor he's putting a 17hp John Deer V-twin on) and he offered to grab the chopper and teach me how to weld while he was working on the mower. I ended up getting the mounts made (and then having to remake the rear mount because I'm not good at math), welded to the floorboard, and remove some of the burs on the choppers frame that I didnt like. After getting the engine mounted and the floorboard mocked up to the chassis, I have found a few issues with my design:
1. The intake pipe will either need to be chopped down or replaced with a straight or offset as the carb is tilted downwards
2. The head is very, very close to the frame, It will clear but if I ever want to run an aftermarket performance head I will either have to notch the frame so I can move the floorboard closer to gain more clearance or run a very short head like this https://www.bikeberry.com/engine-kit-parts/cylinder-head/bbr-tuning-billet-aluminium-high-compression-cylinder-head-66-80cc.html
3. The stock gas tank is very close to the head and the hole I drilled for the petcock is even closer. I prefer NOT to ride a bike that is on fire so I may just bite the bullet and use the China girl gas tank and figure out a way to keep the stock chrome chopper gas tank cover on it

All thats left now is to weld the floorboard, make the axle, and line up the chains.

Anyway, Pics:
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