AquaEye
Member
This thread is born out of the post "97 GTX. Normal engine noise?" posted June 24, 2025.
Have hoist, low profile shop cart, sling arrives next week. Pull engine & then to the 1st order of business, pull oil pump & bench test using factory procedure for validation @ 1,500 rpm. Marks will be aligned to simulated idle setting event so as to confirm .017-.087 ml @ 1,500 rpm for 30 seconds out of one port only or 1.74 ml for both ports using lab scales, 3ml lab syringe as tools. Question, what is the amount of oil dispensed @ w-o? Cant find that anywhere here, YT or factory manual.
Imo, idle oil amount to me is more important, right(?) I want to keep the oil pump. Been pre-mixing for decades & I'm tired of it & besides, I trust Mikuni.
Next, pulling cylinders/head. Using dial bore gauge, two bloodshot eyes, some lessons learned from rebuilding 2 stroke Kawi's & Yami's & with only 40+ hours on the engine & some clueless do-da luck, I might squeak by with just honing...or not. Piston>pin>bearing, very close inspection.
Time frame for this initial start/determination?
No hurry, still have plenty on my plate & a life to live for the rest of this season but I should have results on the oil pump bench test in a couple of weeks.
Will post with a few pics & maybe a video or two @ that time.
FYI: This is my 1st rotary ROTAX build & thou confidence is not high (out of my element, sort of ), you guys have been pointing me in the right direction. Many thanks now & more to come.
Have hoist, low profile shop cart, sling arrives next week. Pull engine & then to the 1st order of business, pull oil pump & bench test using factory procedure for validation @ 1,500 rpm. Marks will be aligned to simulated idle setting event so as to confirm .017-.087 ml @ 1,500 rpm for 30 seconds out of one port only or 1.74 ml for both ports using lab scales, 3ml lab syringe as tools. Question, what is the amount of oil dispensed @ w-o? Cant find that anywhere here, YT or factory manual.
Imo, idle oil amount to me is more important, right(?) I want to keep the oil pump. Been pre-mixing for decades & I'm tired of it & besides, I trust Mikuni.
Next, pulling cylinders/head. Using dial bore gauge, two bloodshot eyes, some lessons learned from rebuilding 2 stroke Kawi's & Yami's & with only 40+ hours on the engine & some clueless do-da luck, I might squeak by with just honing...or not. Piston>pin>bearing, very close inspection.
Time frame for this initial start/determination?
No hurry, still have plenty on my plate & a life to live for the rest of this season but I should have results on the oil pump bench test in a couple of weeks.
Will post with a few pics & maybe a video or two @ that time.
FYI: This is my 1st rotary ROTAX build & thou confidence is not high (out of my element, sort of ), you guys have been pointing me in the right direction. Many thanks now & more to come.
