Re: mark 75 issues

[motoscott909]

hey Dave,

if i’m not mistaken, the top fuel pump is actually between 3&4. I could be wrong, but i’m thinking it would affect both cylinders?

I did put new diaphragms in the pumps when i rebuilt the powerhead, but im not saying one of them didn’t have a pinhole. I guess i never checked and assumed they were okay.

One other thing that i noticed is that in order to get cylinders 3&4 to idle correctly i can only have the low speed needle out about 3/8 of a turn. The other two carbs low speeds are set at around 1 1/8 turns out. I wonder if the new diaphragm i put in is faulty. Ive been through the carbs so many times that i dont think i could have missed anything.