Honda Spree and Elite 50 Forums

hi guys i am after some advice on porting my vision motor but i want to keep it 49cc i have done some mild two stroke porting before on my other bikes but i have never touched a scooter before. my inlet ports seem to be quite restricted by the skirt of the barrel/jug am i right in thinking i should take that away to allow it to breathe a bit more any porting advice would be much appreciated.

Here is what I like to do to stock cylinders.
Take away all of the casting imperfections and transition everything nicely. Then finish it all with with the Stone to get the right texture on it. Raising the exhaust port a little will really help wake it up along with opening it up a bit and improving the transition from rectangle to round .. Have a lookaat the intake tube as well they usually have wacky casting flaws and are way too shiny. The intake windows on the block always need better transitioning as well. Here is a spree intake for example.
Spree block before and after.

hi thanks for a fast reply but that does not look like the engine i have in my bike i think it my be an af05 ?? i will post pis later today.

Might not be the same block or cylinder but the process is totally the same

ive been busy in the shed today with the dremel tool here is what i have done to the ports on the barrel/jug







i think it should to the trick

Have you ran the bore yet? What were the results?

HELLAFLUSHED! wrote:Have you ran the bore yet? What were the results?

not yet i am hoping to here it run tomorrow going to run it on a dellorto phbg19mm with home made expansion chamber to suit the porting. hopefully it should have a bit of poke in comparison to a stock vision

I'm sure you will feel a poke.

in the ear
hahaha i keed i keed.

the stock exhaust is the biggest restriction on that scooter.

the stock transmisson needs to be addressed before the butt dyno numbers change.