August 26, 2010 at 2:00 pm
#28316
TrialsRider
Participant
Here is an example of an intake restrictor plate from a 250cc intake, the penny is shown for comparison. The exhaust restrictor rings of which mine had 3, were of a similarly reduced dimension (same inside dimension as a size 8 finger ring)
The restricted performance and sound was roughly the same as a 125cc or smaller engine.