650/X-2 No increase in acceleration after 1/2 throttle? (Jetmate)

Saw a Jetmate on CL this weekend and picked it up!

Went to test it out today and noticed that anything passed 3/8th's throttle really didn't do anything.

Engine got slightly louder but that's about it.

It can get up on a plane, and the throttle is adjusted correctly and moves through it's full range.

It get's up to about 20-25 mph.

I'm wondering if it's a cavitation issue?

Pump vanes are pretty well worn, missing about an 1" of material similar, but worse than this example pic...

IE2xfqc.jpg

That or maybe that's just it, engine can only push so much before the drag of the boat overcomes it?

Any jetmate drivers out there?

Thanks!

IMG_2574edit.jpg
 
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Myself

manic mechanic
Location
Twin Lakes AR
You need a GPS with you for testing. GPS the boat, then turn high speed screw out 1/4 turn and GPS again. Is it faster or slower?
 
Super clean Jet mate. Having alot of fun in mine.
Plugs or wires may be it also. Jet mate 650 cdi's are known for going bad.
What prop is in it ???
 
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