Carby Yd100 with reed valve and kehien clone carb

[xspade17x]

I am pretty sure it had a 70 stock but put a 71 main jet and a 30 idle jet

 

[xspade17x]

I put a window in the piston and a third transfer port. Which helped significantly but I did when I first got the engine after I ran it once. I didnt like how boggy it was and after I put a window and third transfer port. it helped a lot

 

[KyleGiste]

If you havnt figured it out already its your fuel/oil mixture ratio that is too rich. Also what size tires are you running? 26? because the 50 mm piston and a 56t sprocket is a torque monster but im sure lacks in top end because of it. dropping down to a stock 44 would be a noticeable gain.

Also I highly recomend a delordo carb, fewer problems and well worth the money IMO.