Home › Forum › Ask A Member › What’s considered "Sustained High Speed?" › Re: What’s considered "Sustained High Speed?"
All good info to have and points brought up I hadn’t really taken too much consideration for, other than deciding between a JC4 or JC6 or JC8 depending on the motor (i.e., the ’71-76 22 c.i. 18-20-25’s that blubber at the low end — hotter plugs for the trolling types).
My personal stake in this question is a ’93 70hp; I have been running fixed gap plugs because I am usually at WOT going several miles when on the ocean or big lakes. If it’s OK to switch back to the QL77JC4’s, I’m fine with going back to those. This particular motor is one that Fleetwin and I have had several discussions about and I’ve found when warm idles just fine, when cold, has to be trimmed almost out of the water to prevent a stall at low RPM’s.
Wondering if switching back to L77JC4’s might help the situation.
Ran into a ’97 50hp motor recently with the same issue — having difficulty getting it to run above 100°.