Suggestions for bug out build

You can burn any clutch up if the engine is put under engine strain. This is where a tachometer comes in handy. With a single ratio drive a multi drive bike gives you more ratios to efficiently pedal assist the engine.

In my case I have a triple chainring shift kit. The reduction range is 66.79:1 to 16.25:1

I use a 33cc 4 stroke engine. I'm 250 lbs, the bike weighs a 100 lbs and I've pulled 200 lbs in my pull behind trailer up 30% grade hills. So there's no danger in burning the clutch out if the right gear ratio is being used for a given task.
A 33cc...I tossed that thought aside thinking it would not be enough power..I need to revisit my thinking. Being a cyclist I am conditioned to pedal, what you have me thinking now is I need to setup a bike that is comfortable to pedal versus purely built for a motor. In fact I have a spare matching frame for me go to cycling bike, if I set that one up with a motor, I wouldn't have to worry about my old man body readjusting to a different bike geometry, other than maybe wider spaced pedals.....
 
I don't do it anymore because the government where i live has banned all liquid fueled motorised bicycles.
Up until the point that they put the ban in place, i was travelling around 300 Km per week; around 185 miles doing all manner of things: picking up firewood along walking trails and transporting it home in the trailer train, general recreation as well as using the bike to get me to and from work.

The bike is fitted with a 9 inch Hayes V9 disk brake on the front wheel and a 6 inch disk on the rear wheel.
It provides plenty of stopping power.

The tyres are Schwalbe 26 x 2.125 Marathon Plus combined with puncture proof tyre liners. I have never had a puncture in the 5 years that i have ridden the bike.

On average, the replacement service life of the cylinder was 4,000 kilometers (2500 miles) and the bottom end had a replacement service life of 10,000 kilometers (6,200 miles) running the engine on premium non ethanol fuel and 25:1 oil fuel ratio with a self imposed 4,800 rpm rev limit but the normal rpm zone was 3,000 to 3,800 rpm where it produced maximum torque spread.
In the video, you can get an idea of the way the engine was set up to provide low and midrange torque; not requiring high rpm to make power. From personal experience, the crowded rolled bearing crankshaft setup proved to be very reliable but the caged needle roller bearing crankshaft design was only good for 4,000 kilometers before failure (2,500 miles).
As soon as the bike was revved over 5,000 rpm, the crankshaft suffered failure within 300 kilometers (185 miles). Maybe the crankshafts are better made these days but it looks like they are still using the same design.

The maximum load hauled by the bike is around 200 kilos or 450 pounds with the 6 trailer setup. The old girl was in low range and working her heart out climbing hills.
This might be helpful.

 
Which is exactly the reason for things being made as simple and uncomplicated as possible...The more parts and modifications used on our little machines, the more that things can go wrong and you will not have the right items to fix it in the field...I even keep an extra CDI, magneto, and li-on batteries and light sets in faraday bags just in case of EMPs...DAMIEN
Being a fellow "forward" thinker, I am right in sync with you Damien. I keep spare parts on hand for most everything from my 25 year old kenmore washing machine (when they were built right) to my light tower diesel backup generator and on a more day to day "prepping" perspective I always carry in the car a full tool set with a box of common spare parts that easy and cheap as they are to replace ( example coil pack) will leave one stranded. I'll setup a faraday bag based on what you generously shared...thanks!
 

a B.O.B. trailer will be easily maneuverable and can carry a load. Kind of hard to park though, as it only has one wheel. It also mounts to the axle.




Wasn't there a guy on this forum that had like 20 trailers on his MB?

I saw a you tube with that 20 trailer load....amazing...from a fresh newbie perspective I found myself pulled between evidence of centrifugal clutches burning out in a matter of hours of use to videos like the 20 trailer that give these bikes an almost invincible power. Hence was time to engage the wisdom on these pages. The forum is great for getting schooled...I'm learning its all about different transmission setups and pedal assisting the ride. That BOB trailer is awesome....
 
Being a fellow "forward" thinker, I am right in sync with you Damien.
We are also both of the same Boomer Generation too...lol...I turn 67 years old in June...lol...DAMIEN

Ps...The six P's...Proper Preparation Prevents Piss Poor Performance...lol

I case you haven't seen it, this is my present bike build.
 

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We are also both of the same Boomer Generation too...lol...I turn 67 years old in June...lol...DAMIEN

Ps...The six P's...Proper Preparation Prevents Piss Poor Performance...lol

I case you haven't seen it, this is my present bike build.
Well my newbee opinion is still in the infancy stage, but your ride looks awesome., clean.... I actually turn 67 in May...67 just sounds better then 66 ;)
 
There is and will be a big market for bug out motorized bikes. You will do well.. I'll have to keep an eye on your posts to follow your transmission R&D. From my naive perspective in this new to me world of motorized bikes, the weakness of the centrifugal clutch on 4 strokes is a big concern as reliability in a post apocalyptic world which preppers plan for doesn't allow for breakdowns.


I'm trying to design it so you can pull parts off any cheap old bike you find in your path. Will be a chain drive reduction and gear box on the first versions. The biggest reason I want gearing is because of the weakness of the clutches on the 4 strokes. On my baby girls I can beat the crap out of them and slip the clutch all day long no problems. I try that on 4 stroke and my clutch is gone in minutes. With the way people are, i know they will overload anything I build. I'm trying to prepare for that, making a system that will lug your truck up hill. May be at 1 mph hour, but I want to make it that tough. That's after I figure out my first few boxes though. I need to break some things first. to see what I should fix. lol. I'll start posting when I get all my parts.
 
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