2001 gti idle no rev

[chadly004]

Got this jet ski from a buddy and having some issues with it. ( probably the reason he gave it to me for a case of beer) anyways I’ve got the thing running but it won’t really rev up if you give it a tiny throttle it will try to rev but never fully rev and sounds like a mos fire or maybe timing or possibly fuel issue not exactly sure and new to jet skis but not new to 2 strokes so far my dad and I have

Checked compression and had 135 across both cylinders

Removed and cleaned the carb

Checked continuity on the dess post

Checked to see if exhaust was plugged

Checked the coils for resistance and what not(has spark)

Done the old take one spark plug wire off and see if anything changes

So really looking for some advice here as to wait would be making it not run I’m thinking it could be the rotary valve but my dad said the shaft had no play. Is that enough evidence to rule that out ? He also thinks it’s could be in the mpem. We are getting no beeps when connecting the key but it will still fire up and idle roughly

Any help would be super helpful as we are new to this and shops are not cheap!
Here’s a video

 

[Grim]

Do you have a RPM guage on your ski? The idle outside the water should be about 2800 RPM/1400 RM in the water. Check that. Has it been sitting long, the carbs on seadoos don't like to sit? Did you rebuild them by chance ?

The beeper may not be working on your ski, so if it fires up most likely the MPEM is ok, but further test may be needed to verify that. My ski beeps when it wants to, even after replacing it.

two things I would do: check the voltage regulator and check for issue with fuel delivery.

Voltage regulator: put a meter on the battery, start it up, should read high 12V to low 13V ish, then rev it up (as much as you can) if should climb, normal ops is at 4500 RPM you should have high 13V to mid 14V range. More than that it is bad, no voltage climb on revving ...bad.

Fuel check: take the line coming from the tank to the carb, put it in a bucket of remix gas and 2 stroke oil, run it from the bucket to verify carbs are sucking fluid and the tank system is not the issue. If you still have issues you might want to rebuild the carbs with OEM rebuild kit (only) there is a stick on how to do it on this forum.