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Kimjon's not as cool or epic as Muncie's off-road goped Bigfoot scooter thingy


Kimjon

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Here it is with the crank and piston installed.

IMG_20180119_173815.thumb.jpg.766231349aedd9abb75d4d78d224ea1a.jpg

The open style of cylinder with a removable head allows me to port time the motor. I'll stick a degree wheel on the crank, turn it over and measure the degrees at which the ports open and close. Once I have this data, I'll know where improvements can be made.

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Here's a before and after photo to see the difference

IMG_20180119_171552.thumb.jpg.98706eb682f02805a36f5c036f684443.jpg

And after

IMG_20180120_174338.thumb.jpg.b921afde208b7e8a564a9cf7512f65d3.jpg

And hopefully that equally more flow, and will be one of many things that add up to more power.

Next up for the motor is to calculate its port areas, timing, squish band and compression...then tweak those with yet more porting.

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Piston received a little love. It was black as black can be with carbon build up.

Here it is after 10 minutes sanding:

IMG_20180121_171303.thumb.jpg.78a49aa1661f7ae0d5f61c5e1b01d05b.jpg

Still looked shit...so I broke out the random orbital, couple minutes on that, then on the buffer wheel...finally got the dome polished where it needs to be.

IMG_20180121_173050.thumb.jpg.2dda40105e1755f0867290abb6375629.jpg

That was way more work than anticipated.

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On to the reed valves.

In my opinion, they face the wrong way in these motors? The air/fuel is dragged in, up and around the massive reed support.

I've flipped them around so that the air/fuel mix is pulled cleanly through them unobstructed. Fingers crossed this is the right idea???IMG_20180125_151810.thumb.jpg.630530334a42cb04b566761cb56b6ac1.jpg

However, problem is they don't fit! So I'll make them fit!!!

IMG_20180125_152154.thumb.jpg.85913059147db9047b715c095fd24ecc.jpg

Okay...truth be told it was never going to hold how I clamped it above and it moved on me, so take 2 below:

IMG_20180125_174844.thumb.jpg.c47d11b77cb1f555a6d0be19b58d6719.jpg

Mmmmm pretty...

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I further milled a step on top to add clearance, and used the dremel to smooth it out

IMG_20180125_180147.thumb.jpg.ce558c26d731c76b2520aae40d4eed08.jpg

And then installed it, perfect!

IMG_20180125_182901.thumb.jpg.7acbfe4874ea6359c6de610bf4cc1402.jpg

Follows the crank, allows a nice wide opening, flow is now going the right direction...think it's getting there now.

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I ordered a diaphragm style carburetor kit from eBay, it arrived in record time...But it would have been awesome if they'd sent me the right one.

The manifold in the kit was for a completely different motor!

IMG_20180122_072838.thumb.jpg.00f49ab8dfbc6c4c7fae1ba9b5b90d51.jpg

It only has two mounting holes, but my motor has four.

Countless emails, achieved nothing in the end...I just wanted the shitty Chinese manifold for fuck sakes...But in the end they offered a part refund instead, which leaves me no further ahead.

So, solution:

IMG_20180127_184553.thumb.jpg.e0edead0b543303fd94e54442f5fa444.jpg

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Original manifold milled down flat, this will bolt to the motor.

IMG_20180127_184819.thumb.jpg.e70bb39ad1dbbe95804994cdd8bcb4f2.jpg

Port matching to the other manifold shape. A pulse port drilled in the side to run the fuel pump/diaphragm.

IMG_20180127_191400.thumb.jpg.8e608f56eb583851355099c380d2c798.jpg

Test fit...Fucking ugly as sin, but should be functional. I'll grind off any excess material later to try make it look a wee bit better than it currently does.

IMG_20180127_191346.thumb.jpg.7eb8ac637ab0dba64124736656a11f87.jpg

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Now jumping on to brakes. I've added a disc brake to this goped. It was missing its brakes, so I hacked off whatever brackets were there and started again:

IMG_20180128_123412.thumb.jpg.07a8a58a598f370457decfbe97a556d9.jpg

A few holes and a couple minutes with a grinder made this sexy bracket. Gotta love a good bracket!

IMG_20180128_130553.thumb.jpg.b5724ae9e9909fa8b5f6ed39d6091833.jpg

Tacked in place.

 

 

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As all of us know, NZ is a small country. In other countries say the USA even if only 0.00001% of the population was into a niche activity (like gopeds) that'd still equate to over 3,230. In NZ 0.00001% of the population would only be 45 people. You can see why no one would make a living here doing anything that's not mainstream.

So that's my long way of saying I was unbelievably lucky, to find/buy this on trademe last night!

Screenshot_2018-01-29-07-42-24.jpeg.f8153052614ec9e00b5c434166d21cc9.jpeg

Seriously...I couldn't believe my luck, a box of go-fast bits for my motor. Fuck yeah! Stoked!!!

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