val-e-vue
Active Member
After rebuilding the engines in two 1998 GTX Limited skis, I had them at a camp on Lake Champlain for 3 weeks. During that time I pre-mixed the fuel at 40:1 to be on the safe side. I filled the oil injection tank on both machines on day 1 and proceeded to keep track of the fuel I burned in each machine. After the second week I totaled up the fuel burned, refilled the oil injection tanks to see how much oil had been delivered. Here are my results:
Ski #1:
Fuel usage: 40.5 gallons
Oil usage: 78 oz
Fuel:Oil Ratio: 67:1
Ski #2:
Fuel usage: 43.5 gallons
Oil usage: 52 oz
Fuel:Oil Ratio: 107:1
Clearly, I'm thrilled that I pre-mixed ski #2. I'm not so sure about ski #1. I have not found good documentation on this other than the shop manual provides a good procedure for testing the pump at 1500 RPM with pump at full open position (0.83 - 1.01 ml each port).
Any experience with measuring oil usage vs fuel usage?
I think I should take the pump and carb adapters off both machines and bench test. Of course I will be challenged to find the actual RPM of my drill motor. It looks like the pumps are linear because they say you can double the RPM and you should get double the oil. You don't find much information related to rebuilding the pump, so I would guess the focus might be on cleaning the nozzle (check valve) and hope that gets the flow rate back to normal.
Thanks, Gregg
Ski #1:
Fuel usage: 40.5 gallons
Oil usage: 78 oz
Fuel:Oil Ratio: 67:1
Ski #2:
Fuel usage: 43.5 gallons
Oil usage: 52 oz
Fuel:Oil Ratio: 107:1
Clearly, I'm thrilled that I pre-mixed ski #2. I'm not so sure about ski #1. I have not found good documentation on this other than the shop manual provides a good procedure for testing the pump at 1500 RPM with pump at full open position (0.83 - 1.01 ml each port).
Any experience with measuring oil usage vs fuel usage?
I think I should take the pump and carb adapters off both machines and bench test. Of course I will be challenged to find the actual RPM of my drill motor. It looks like the pumps are linear because they say you can double the RPM and you should get double the oil. You don't find much information related to rebuilding the pump, so I would guess the focus might be on cleaning the nozzle (check valve) and hope that gets the flow rate back to normal.
Thanks, Gregg