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Never really heard them referred to as "high altitude gears" but anyhow.
In many models there is two different gear ratio's available.
Turned out to be bad tooth on forward gear and pinion gear 299 bucks later runs like a champ
Fuel pump is wired in with ignition on purpose, When engine is turned off pump shuts off also, Not a fan of electric fuel pumps, safety issues, Replace
Thanks& good luck.
Ok guys I have a 97 115 elpto on a 97 nitro 700 lx. Ok here is the deal bought the boat used it has a 26p laser 2 prop. The motors max rpm range is 5250