Well you're not alone, I'll be trying to solve the same problem tomorrow afternoon. Dies at 2 idling, idles at 3 but bogs down and dies at just the right distance to make it inconvenient to push back. Leaks profusely at anything over 3. I'd like swap them with the HIF6s, but they need some rebuilding... The pistons stick in the domes.
You're running BAL needles with a B18? I don't know that any HIF6 needle is specified for the smaller engine. Maybe a 3-bolt HS6 needle would be more appropriate. KN rings a bell I think...
-Sean
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