Been working on my 505/1a for a while and tried to port the exhaust with gains up to 37mph but what sounded like fourstroking madness, been riding it alot too.
I decidedz to think to myself and I figured I could port the dang exhaust to allow it to breathe better. so I ported it some more and made myself feel really good.
hmm, after inspection of the cylinder what do I see?
Part of my cylinder wall is completely black!
- massive ring blowby!
but, sadly yet, I still ported before I noticed this.
lost 3 mph out of my top end and fourstroking worst than before.
- which is blowby
gained in my mid, damn thing only does 34mph now.... gah.
Should I use another cylinder with a different piston and rings?
I opened my intake to 15.75mm. I have a 15mm carb.
all this doesn't matter if my rings are shot....
if the rings weren't doing that, my bike would be alot faster.
37 was stock cylinder!!!
If I got rings for it, it would be hitting about 40 I know it....
<3 you little moped.