In the late 1990's with the standard engine and the Twister, the exhaust
flange was shortened like the example on the left. The also used a 6-32
screw to attach the muffler.
The case on the right was the normal length of the exhaust flange used
from the beginning. This version uses the #5 screw size mentioned above.
We have returned to this length on the latest production crankcase with
the 3 webs on the front of the case. For
more information click here.
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