Yeah we still have the 80cc Yamaha dirt bike I bought the kids long ago. Was going to get them the 125cc but my youngest son's feet wouldn't reach the ground. I was impressed at what that 80cc would do. Broke my damn ribs with it when it threw me is soft sand.

 

As regards to the Scramble video venue, back then there was a heck of a lot that was marked 'Made in England'.
Then Japanese products started appearing, just as today, except it is now China.
There was a law that came out in the UK at that time that limited the size of a bike to 250cc that could be ridden by one with a learners licence, the Japanese proceded to produce a 250cc that had the performance of a 350cc+.+
Max.

 

The Japanese took 2 stroke motors to art form. I love trying their port and timing designs to get more power out of these engines. Being 2 stroke, the bore and stroke is 80cc but if you consider the ports they're closer to 66cc. It's possible to port these engines to get 5 or more HP out of them. I've built one that's ported and windowed, everything is polished and built to intended tolerances... which isn't what you get. I will be designing an adjustable CDI to get rid of the advance at higher RPM which limits the revs quite a bit. Stock motors stop at about 6K RPM, it's possible to get them to 12-15k. At that point we will have to balance the cranks better. They come poorly balanced.

Illinois state law allows these to be in the same class as electric bicycles if you follow the rules. So no license, registration and insurance needed. Further they get about 100 mpg.

I'm finding it a challenge to get more and more out of them. Everything we do in performance increases efficiency and we get a smoother and more reliable build.

 

The Japanese took 2 stroke motors to art form.

Not only Bikes, everything, because they did not go through an industrial revolution like England, et-al, they would take existing products like motorbikes, cameras, etc, back to Japan and strip them down and see how they could not only reproduce, but make them better and cheaper.
Max.

 

Japanese is no longer cheaper but still make better and when critical, worth considering. China is hit or miss. They are capable but don’t have good quality control. I’m impressed by Taiwan and would not have any problems using stuff from there.

 

Electric Bikes, not a bike per say not a motorcycle maybe a scooter.

kv

 

First bike was a 90 cc Yamaha when I was 19 and in Iwa Kuni Japan. Rode that little bike all over Japan and before I left shipped a new 125 cc Enduro back. Riding in Japan was a blast back then and bones healed much faster. This morning was cool and pleasant so I got a ride in up along the lakefront.

Many thanks for sharing the videos. The first brought back many fun memories and the second reminded me of my age.

A few weeks ago I had the pleasure of getting on a nice little Honda 300 Rebel. That was fun and these days any escape from the COVID nonsense is fun. I wanted to get a small fun bike this year but the investments to a hit with COVID. On the bright side things are recovering.

Ron

 

Electric Bikes, not a bike per say not a motorcycle maybe a scooter.

kv

That looks fun!

 

these guys are insane doing these speeds on bicycles built for 15 mph

 

That looks fun!

I like that it isn’t normal, no chain. The reason I like Yamaha, direct drive, I think I could get into the repair aspect. It would be fun also, light weight easy to move around less space. My friend likes bikes a younger guy in his 40’s a web dev who was thinking about working in the bike industry at home part time. I got him into Motorcycles we worked together at the University and stayed friends after I retired. He still rides both but, introduced me to the electric stuff, Harley introduced their new electric version not sure when but they look cool but more power and speed. Just like their Motorized Harley is about power off the block, I‘d like to see a Hybrid bike meaning both with a motor and electric. If the electric stops you can start up a motor that powers a generator to power the bike until you get to your destination.

kv

 

these guys are insane doing these speeds on bicycles built for 15 mph

Reminds me of the early turn of the century Motorcycle Bikes, maybe they’ll bring back the wood race tracks or flat dirt tracks.

They need suspension though, tough on the back if your on ruff ground.


kv

 

I like that it isn’t normal, no chain. The reason I like Yamaha, direct drive, I think I could get into the repair aspect. It would be fun also, light weight easy to move around less space. My friend likes bikes a younger guy in his 40’s a web dev who was thinking about working in the bike industry at home part time. I got him into Motorcycles we worked together at the University and stayed friends after I retired. He still rides both but, introduced me to the electric stuff, Harley introduced their new electric version not sure when but they look cool but more power and speed. Just like their Motorized Harley is about power off the block, I‘d like to see a Hybrid bike meaning both with a motor and electric. If the electric stops you can start up a motor that powers a generator to power the bike until you get to your destination.

kv

There isn't a whole lot of room on a bike for a hybrid system, although I do like the idea. Years ago I entertained the idea of making an electric motorcycle and found that in order to have any useful range, the battery pack (even using LiPo) would have to be so large that it would be more aptly called a rolling battery than a motorcycle. Most people would say that there simply isn't space. Those people probably haven't been to s.e. Asia.

It could be done but it probably wouldn't look right. And that's important.

 

There isn't a whole lot of room on a bike for a hybrid system, although I do like the idea. Years ago I entertained the idea of making an electric motorcycle and found that in order to have any useful range, the battery pack (even using LiPo) would have to be so large that it would be more aptly called a rolling battery than a motorcycle. Most people would say that there simply isn't space. Those people probably haven't been to s.e. Asia.
View attachment 213083
It could be done but it probably wouldn't look right. And that's important.

Harley did a good job making an e-bike but it’s over priced. Maybe I would pay 7k but 30 no way.

I’ll wait until prices and sound reasoning begins to take the market.

kv

 

Harley did a good job making an e-bike but it’s over priced. Maybe I would pay 7k but 30 no way.

I’ll wait until prices and sound reasoning begins to take the market.

kv

HD (Harley Davidson = HD (Hundres Dollar)

The lowest priced stuff with the HD label is a hundred dollars. While not true it is close. While there has been talk and of course pictures of the new electric bike I have yet to see one and don't know if my local dealership has. I know within my HOG chapter there are mixed thoughts.

Ron

 

HD (Harley Davidson = HD (Hundres Dollar)

The lowest priced stuff with the HD label is a hundred dollars. While not true it is close. While there has been talk and of course pictures of the new electric bike I have yet to see one and don't know if my local dealership has. I know within my HOG chapter there are mixed thoughts.

Ron

My dealer has 4 of them, I was told when they rode them it’ll almost leave you if you start out to fast.


kv

 

My dealer has 4 of them, I was told when they rode them it’ll almost leave you if you start out to fast.


kv

Do they make any noise or just hum? There was comment about them being fast out of the hole.

Ron

 

Maybe they can add an electric vibrator to recreate the visceral feel of the V-Twins thump.

 

Do they make any noise or just hum? There was comment about them being fast out of the hole.

Ron

They said there is a sound added within it’s design that sounds a lot like a Jet Engine

kv

 

Well there goes the Loud Noise (open pipes) to let the idiots in the cars know you are in their quarter panel blind spot. Might have to put some playing cards into the spokes...

 

I've built one that's ported

Do they still port with a "D" shape? With the flat at the top? That was the big deal back in my youth.