Mercury blackmax 135 2 stroke

by Don Grant
(Anaheim CA)

Misfire At idle and stalls occasionally but runs fine otherwise. This started two years ago with just a slight misfire at idle but always started fine and ran perfect otherwise. Now it stalls sometimes but still only at idle. But it seems to pick the worst time to stall like when pulling up at a busy dock or putting it on the trailer when it’s windy. I tried pulling the spark plug wires one at a time and none of them seemed to make any difference unless I take more than three off at the same time. It will still idle on three cylinders and it doesn’t seem to matter which three. So I think it’s firing on all six but just won’t idle for sh*t.

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