whistling noise from engine

i got an smc rexy moped with a jog 3kj type motor tht has a whistling sound from the

engine.

53mm bore kit with brand new piston and rings

41.6mm stroker crank

8.2.1 gears

24 oko

uni filter

krs variator

1500 red center spring

new red clutch springs

phongeer pipe

after 3 days without turning it on. i ran the bike and it just started to make the noise

Much help appreciated.

THANKS

Re: whistling noise from engine

Tyler Jaynes /

Could be your seals. I had a fresh rebuilt motor do that once for a little bit.

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