80cc Backwards?? Will it run?? Check out if an 80cc engine will work with it installed backwards. 

Thanks, I was wondering about this. Back in the day, British builders would do this with Triumph vertical twins, and it seemed to work fine. I'm not sure about the engineering details, but it seemed that the boost effect would be beneficial for increasing power. Twin Amals with velocity stacks and convex integral screens up front to keep things clean and flowing efficiently. In the early days of two stroke racing in Europe, the engines used superchargers in order to increase performance. I'm not sure if they used case induction or cylinder ports. Eventually the supercharger was banned, perhaps for safety reasons. A narrow power band may have made controlling the bike difficult. This kind of forced air induction might be a good alternative.

I did this once on a board track replica to make it look more like a vintage bike. I talked it over with Matt at Bicycle Motor Works and he advised a little porting on the transfer ports in the case and the cylinder to make a better flow and it ran lot smoother with more power after I did.

How could anyone give this a dislike! Great video

Dope bro. I finished my 1st bike too!

Even tho the boost from having the intake facing into the wind isnt much i think it is much better than the wind passing by the intake mounted on the other side trying to suck out what in it like a chimney on a house. Every little bit counts.

Max speed 31mph, ive done 45mph on my stock ported 66cc gasbike. Must be the restricted transfer ports to the crankcase not aligning, port match everything and port it inside 1-2mm intake(don't go up) and exhaust (don't port down just sides/maybe just a little on the top)

You could probably widen the transfer openings in the case with a carbide cutter and get that torque back.

Sweet! You essentially gave it ram air like an old Firebird! I might try this with my next build, which is probably going to be a stripped down nel lusso with mountain bike tires and different handlebars.

I'm currently running a bbr 100cc engine...also with a reverse jug..placing the intake up front and the exhaust in the rear..only problem is, you have to run a bigger jet to allow more fuel to keep up with the extra air..

And wsrch rhem frames i had a brand-new one and the luggage holder in the back and the two little cross bars that meet the frame the weld snap there too

thats far out , i was thinking about this and am now going to put two 100cc motors in a vee configuration so the carbs are in between the engines and build a jackshaft setup to connect them ..they should self time with clutch slippage ,,ill see if that works

Did you turn the Piston around as well.

Just had to port the case on a LD80. There is plenty of meat there to match ports and have ample seal surface.

can you show how to turn the piston and jug around?

your bike seems to be quite safe concerning the weld quality. someone said Nel lusso frames weren't safe for an engine

Well done. Now do the same with a 4 stroke.

wish you would of done a video with the motor put in the right way an then turn it around for comparison of top speed

Just clicked on and yes it will run as long as u turn piston ard

I have an 80cc one they go pretty hard and need fix the clutch on the beast might need a bearing thing where clutch cable goes.

I've been wondering if maybe I need to get a longer intake since I changed to the f4 Thrust pipe, do you know if it would improve my engine to elongate the intake pipe?

Do you have any leaks from under the jug since the port's don't line up?

Good video,What piston/rod combo is this? I’ve wanted to try this on my 66cc chopper.

Impressive!

what if a guy were to just turn the whole motor 180 degrees and flip the coil magnet for the right timing? Any thoughts?

Runs hotter? cooler? more reliable mabye?

I just got my first bike motor and I was wondering why the intake wasn't in front. I thought maybe because the exhaust needed the extra air flow to keep the temperature lower. Do you think you'll be more likely to overheat the motor?

What has ratio would you recommend for this engine then? I'm using about 16:1 an geting about 25mph out of it an it's same engin only the right way round lol

You think I should do this for my first build

is that bad for engine?

I just had a bran new motor 66cc motor seize up on me , inside no damage other than from the wrist pin clip that came out. Any advice about that ? 2nd time it happened .

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Is this a two stoke?

Try to put it run in reverse

OK--WHY

Backwards man from Freddy got f gured

Go one better and start it in reverse lol.

Yea just looks silly