My bike (Honda cd 70) iz 9 years old and is well maintained,, 1year before one of engine's main bearing was stucked and i replaced it wid new Japanese genuine bearing.. (also changed timing chain, clutch plates, piston rings, and valve wid new one)
after that engine's pick was good and had smooth running,,,
but problem iz that speed of my bike is little reduced after engine was opened,, I also tried 15 teeth gear on chain but all in vain..
plz help to increase speed of bike.
when u tune it ask ur mechanic about it,, srf hath sa chk karna k baad hi banda kch kah saktha hay,,
it could be clutch plates ( pressure plates actually) be worn out,,
plates cost 40-1300 rs depending on quality,,may be u got something ofbad quality last time,,
use original engine oil better havolie from pump itself,,
lube chain, adjust carb, tune tappats,, and check for any leaks on the place where the carburetors pipe meets the cylinder head engine)
Hey Bro don't worry if the bike is not speeding up,your bike is wholly OK don't damage the engine calm down or in other words ye jang nai he Bhai bike ko bike ki tarah chalao us per zulm hargiz mat dhao.