Pump Issues Trouble Shoot

Location
Winnipeg
I had the pump out of my machine in order to replace my steering cable. This isn't the first time I have pulled a pump out, and everything came apart fairly simply and went back together easily. On my first ride I ran into an issue:

Once I get on plane my machine runs strong, accelerates fine and reaches top speed. The issue is at low speeds trying to get onto plane. So if I am doing a tail stand or trying to recover off of hitting a wake. The engine sounds as though it is revving up but the machine wont accelerate out of this position, I've had to lean it over to 'turn my way' out of being stuck.

- My plugs look good, no issues in colour
- I pulled my carbs off before this ride but didn't adjust them since last time it was running properly
- It feels like the machine is cavatating, as though the drive shaft is slipping.

I pulled the pump and the splines on the drive shaft are all in tact, and I can verify that there was no metal particles that would lead me to believe that the female end was wearing.

I also noticed when I pulled the pump again that the factory cooling line tap no longer has the circular insert in the end and is therefore not working(trying to add a picture). This is the factory cooling tap that faces forward, essentially the water now just gets blasted through at a 90. My pump is tapped for dual cooling on my 701 with B-pipe. Has anyone had this happen and what have you done to fix it.

Any thoughts on why I could be running into this lack of acceleration issue even though it sounds like the motor is revving up? Could this be caused by excess heat from only the single cooling line operating?

Thank you for any input, it is greatly appreciated. Links to other threads about this are appreciated as well.IMG_20150623_191232.jpg IMG_20150623_191223.jpg
 

Kohldanielzimmer

Sierra Nevada Runoff Rider
Site Supporter
Location
Ahwahnee, CA
Thread the hole on the 90 and put in a brass plug.

Check to ensure that your pump seal is not worn or misaligned some how. It sounds like your pump is not sealed to the hull and that is causing cavitation.
 

Roseand

The Weaponizer
Site Supporter
Location
Wisconsin
Yup when you take off the pump make sure you push hard against the hull when tightening it too. And for future reference, you don't need to take the pump off to change the steering cable. It's a little more of a pain to get the steering cable cap off but worth not having to pull the pump IMO
 
Flip it over, or lift the back end, set it on some
Horses, either way, take ride plate off. Pull cooling lines if they are in your way, undo cap that holds steering cable and take all the clips and washers off. Pull out cable. Replace in order of taking apart. Pay attention to the connector that holds the steering cable


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I had this issue on my micro, the seal looked tight against the pump shoe but it actually wasn't in one spot, this caused cavitation. I just took some black rtv silicone and filled the gap between the pump shoe and wear ring which fixed the issue.
 
Location
Winnipeg
Thanks a ton for the insight, I didn't even think of tapping hole which I will do tonight. I have some RTV kicking around and put that on the seal when I put it back on.

Thank you for the help, I'll post back once I'm back on the water.
 
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