97_Sea_Doo_GTX
Member
Hello Everyone,
A couple of years ago in 2020 I was having trouble with my 97 GTX running correctly. I asked y'all for advice and no matter what I did it simply would not run after warm up. I decided to leave it in the garage all of 2021 until this spring when I felt like tackling the issue again. It ended up being the MPEM.
So while I was getting the engine back in shape, I decided to do a full rebuild and glad I did. I found a bad crank bearing that would have been a problem sooner or later. SInce the rebuild, the engine runs great except for a bog when pinning the throttle from idle to full speed. RPM at the top end is about 6600+.
Here's a list of everything I've done so far:
- Jugs bored out to first oversize
- Rebuilt crank and CB shaft
- Carbs cleaned and rebuilt with Mikuni kits (4 times with the problems I was having).
- Low speed adjusters initially set at 1 turn out and now at 1-1/14 turns out. No real change in idle quality or performance. Engine starts and idles great.
- Hi speed set at 1/2 turn on the PTO and 0 on the Mag. Tried opening each screw an extra 1/8 turn but engine seemed to load up more when accelerating. Changed back to the original settings.
- Popoff set at 36 psi on each carb.
- New Tygon fuel lines.
- Fuel vents cleaned and working.
- Cleaned fuel baffle and inline fuel filter screen.
- New Arieltek MPEM set at -2 degrees of timing per the stamp on the engine case.
- New spark plugs, plug boots, coil, stator and rectifier. Battery charges as it should.
- New battery.
- RAVE's set even with the top of the housing.
- Water valve set to original specs.
- Impeller completely rebuilt with clearance well within spec.
So, my question is, what should I try next to get rid of the bog? I have run about 15 gallons of fuel throught the rebuilt engine and the spark plugs are a nice chocolate brown color with no fouling. Basically, everything is new.
Any advice is appreciated.
A couple of years ago in 2020 I was having trouble with my 97 GTX running correctly. I asked y'all for advice and no matter what I did it simply would not run after warm up. I decided to leave it in the garage all of 2021 until this spring when I felt like tackling the issue again. It ended up being the MPEM.
So while I was getting the engine back in shape, I decided to do a full rebuild and glad I did. I found a bad crank bearing that would have been a problem sooner or later. SInce the rebuild, the engine runs great except for a bog when pinning the throttle from idle to full speed. RPM at the top end is about 6600+.
Here's a list of everything I've done so far:
- Jugs bored out to first oversize
- Rebuilt crank and CB shaft
- Carbs cleaned and rebuilt with Mikuni kits (4 times with the problems I was having).
- Low speed adjusters initially set at 1 turn out and now at 1-1/14 turns out. No real change in idle quality or performance. Engine starts and idles great.
- Hi speed set at 1/2 turn on the PTO and 0 on the Mag. Tried opening each screw an extra 1/8 turn but engine seemed to load up more when accelerating. Changed back to the original settings.
- Popoff set at 36 psi on each carb.
- New Tygon fuel lines.
- Fuel vents cleaned and working.
- Cleaned fuel baffle and inline fuel filter screen.
- New Arieltek MPEM set at -2 degrees of timing per the stamp on the engine case.
- New spark plugs, plug boots, coil, stator and rectifier. Battery charges as it should.
- New battery.
- RAVE's set even with the top of the housing.
- Water valve set to original specs.
- Impeller completely rebuilt with clearance well within spec.
So, my question is, what should I try next to get rid of the bog? I have run about 15 gallons of fuel throught the rebuilt engine and the spark plugs are a nice chocolate brown color with no fouling. Basically, everything is new.
Any advice is appreciated.
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