100 cc motorized bike slow

[Gordy]

The LD100 and BT100 are exceptions in my eyes. If I wanted a 100 engine again I would pick one of those 2. The YD100 is just not that great 90% of the time.

Yeah, the LD and BT are completely different designs. They actually have a decent starting point for porting and they have 2 piece jugs

 

[DAMIEN1307]

The YD100 is just not that great 90% of the time.

OK, so correct me if I am wrong here...lol...The YD-100 is the one piece cylinder jug and the LD-100 is the 2 piece cylinder jug as it has the head that needs to be put on it when assembling things ???

I am asking this since the OP says his a one piece jug.

 

[robe]

I have the cheapo pipe with the muffler Rocket mentioned. The muffler works great, I have a 3/4 copper street elbow jammed in the end.
The pipe isn't the best but it helps with low end torque.

 

[Johnny_]

The title of this thread is a pretty good description of the '100cc' engines.

Them's fighting words! Mine goes plenty fast lol.

 

[mcl]

I think 37mph is doing pretty good for a box stock yd-100.

kmh

 

[mcl]

I think 37mph is doing pretty good for a box stock yd-100.

its funny cause i had an 80 cc one and it goes 46 kmh

 

[mcl]

I have the cheapo pipe with the muffler Rocket mentioned. The muffler works great, I have a 3/4 copper street elbow jammed in the end.
The pipe isn't the best but it helps with low end torque.

when i put on this pipe just louder no speed change buddy said the bike went 45-50 last time he ran think he’s lying tho lmk

 

[Gordy]

View attachment 221837
when i put on this pipe just louder no speed change buddy said the bike went 45-50 last time he ran think he’s lying tho lmk

It won't go very fast without a spark plug...

 

[Johnny_]

It won't go very fast without a spark plug...

Just depends on how fast you can pedal.

 

[mcl]

It won't go very fast without a spark plug...

it’s an old pic of the bike friend sent me just showing it’s all hooked up rn