Rat Bike Project

[willedoo]

First a disclaimer: at this stage this thread is very speculative, but from time to time I can post on any (if any) progress. The thinking is to convert some of my junk into a rideable non road registered rat bike. What brought this on is that I've recently been doing a complete workshop renovation, and when that's up and functional, a build project like this would be a bit of fun for the rainy days.

 

The plan at this stage is:  1. Finish the workshop renovation. The 6x6 metre space has been mainly cleaned out, so at least I'm able to walk around in there and do some work in the shed at the present time. There's still a lot of structural changes to do - relocating diagonal braces, walling in one whole side, building more benches and shelving etc. and finally get the lathe, mill, presses and other gear set up. 

                                            2. Start mustering up parts and bits and pieces.

 

As a basic starting point for the design, number one priority is to build it as a sidecar outfit as I no longer have the physical ability to ride a heavy weight solo bike. Secondly, I prefer the more moderate style rat bikes rather than the extreme steampunk types where the builder has added every contraption known to mankind including the kitchen sink. Those types are a bit amusing, but not my cup of tea. As an explanation, the first of the attached photos I would describe as a fairly moderate Mad Max style,  the second is way too bizzarre for my liking.

 

[Litespeed]

Cool go Willie go...

 

Full build log please.

 

Phil

[willedoo]

With actual building and design, the first place to start is with a motor then design the rest around it. A big decision to make there. A motorcycle motor gives less design headaches compared to the physical dimensions of car motors. With bike motors, Harley motors are good but too expensive. Virago engines and the Honda V4 are solid and cheap, but I'd rather not have a Japanese motor.

 

Another possibility is to try and fit this V6 3800 Buick into it. Width is no issue, the big issue is height if you want to incorporate a traditional motorcycle type fuel tank on top which I prefer. At least this older model has a fairly low profile intake plenium. The later models have a much bigger plenium which gives them more torque and grunt but increases the height quite a bit.

 

[willedoo]

I wish I still had some of the five truckloads of stuff I sent off to to the scrap metal yard in 2021 when I had plans to sell up and move. Those plans changed due to some health issues, and now I'm here for the long run minus a lot of really good junk. The things I really miss are the various gears, axles, diffs, gearboxes and transfer cases. I had a variety of Nissan, Toyota and Suzuki LJ 80 stuff. The Suzuki LJ 80 drive train gear is particularly handy due to it's small size and the thing about them I really like is that they have a stand alone transfer case independant of the main gearbox.

[willedoo]

The fun part is hunting around the place for the components. This afternoon I did a trip down to the bottom shed in the hope that I might have kept a full set of 16" lugged skinny tyres that were originally part of the Suzuki LJ 80 gear that I once had. Fortunately I'd kept them and one of them would make a good front tyre on a spoked rim. The second attached photo is a pic from the net showing one on a front wheel. It gives it a chunky, military look.

 

 

These two photos are of an old copper hot water system tank that I was hoping to use as the main body section of the sidecar. At this stage I'm not so sure about it. If it was 20% bigger in dimension it would be perfect. It's a bit small, around 600mm at it's widest point and at the point where the opening would be cut, it would have an opening of around 500mm. 

 

 

 

Edited 1 hour ago by willedoo

[Marty_d]

Jeez, how do you corner with a square section tyre like that?

[willedoo]

10 minutes ago, Marty_d said:

Jeez, how do you corner with a square section tyre like that?

Combined with those high narrow handlebars it would be very interesting.