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You meant 4 and 6 on the valves, right?
Nice write up...ha Inc done that a few times, a good visual follows along with the descriptive process. I’m distressed to see no coffee breaks, music references or other distractions along the way that usually seem to accompany my service routines! You were in the zone and focused all the way through end to end!
Roper says 4 and 6 on a roller motor. A little loose on the exhaust wont hurt a thing.
We've always run roller motors at 4 & 6. The gaps get bigger as the motor heats up but an extra 2 thou won't make any difference really to how a motor running a closed loop map runs. If you're running an open loop map it will make a noticeable difference! Really.Pete