bpipe whistlte

[shank]

Superjet
701 motor
bpipe
tdr waterbox.
38mm carbs.

When you wide open the throttle and let the throttle off the exhaust is making a whistle noise. Cannot determine why.

 

[Mike W]

I would suspect it’s something with the waterbox.

 

[DAG]

Check for one of these and if you dont have one you should get one and just turn it around the other way and run it backwards