49cc ported and skirted

[Hashbrown]

I just bought a new “ported” jug with 40mm intake and rounded exhaust port. And i skirted the piston a little. I went from 25mph to being able to reach 33mph!! I also bought a 36t sprocket but im waiting to install it till i get better rims. Here is a link to it running.

I think it may be running a little lean im going to run it a few times then xheck the plug

 

[MotorBicycleRacing]

There is a jug with 40mm intake for 48cc motors?
What is the diameter of your piston?
40 mm or 47 mm?

 

[Hashbrown]

It is a 40mm. Here is link to what i bought.
https://www.bicycle-engines.com/48cc-high-performance-cylinder-assembly/

 

[crassius]

yeah, that surprised me too

 

[Hashbrown]

Since my reply has a link in it it has to be reviewed by a mod.
It has. 40mm piston. When i bought it I thought it was just ported but nope i had to buy a new intake as well.
The new jug has wider fins then the old one. I figured id keep the old and try my hand at porting myself and try to make a boost port to utilize the reed valve i bought.