Abnormal engine noises

[Jac-al]

hi,

im helpin a friend out with his NC30.

While doing the valve clearances we noticed that the front head has a cam gear marked 'R' , obviously for the rear and ive heard that the front and rear are different so i got a good second hand one marked 'F'.
We installed it, did valve clearances etc.

Now whats worrying us is the engine is now making a whining noise constantly and while riding there is also an odd mechanical sound above 6k rpm. It sounds similar to a surveillance camera when its remotely rotating if u know what i mean.

Pls can anybody give some advice or info on what could be the problem.

i never rode the bike before but now it pulls strong in 1st and 2nd then from 3rd it doesnt feel like u gaining any more speed nor does it climb much on the speedo.

pls help

[askor200]

If the new cam is missing the wee spring loaded ring gear that could explain the whining; some people remove them as it reduces friction between the cogs.

[magg]

Camshaft should be marked FR IN, FR EX, RR IN and RR EX. Complete camshaft assembles each have different part numbers, although common assembly parts have same numbers.