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Plus he's using an MSD Enhancer (DC) which runs directly off the Battery...

Is that a Powervalve Cylinder? If so, those might be $200 dolla Forged Pistons; jus' sayin'...

Take compression readings and see if its past the Service limit. Just hook up a Battery with a Remote Starter to the Starter for the test. Don't need E-Box, Intake nor Exhaust Manifolds. Just Cylinder Head. Can do it outside of Ski.

You can also attach sacrificial Zinc Anodes onto some Aluminum Parts like the Ride Plate, similar to how Yamaha puts a Zinc Anode inside the Cylinder Block. Galvanzing Spray Paint can help also:

Yes, anodizing creates a non-conductive aluminum oxide layer on aluminum that serves as an electrical insulator. No Bueno for Ground Cable...o_O

For those who think that a bad Battery Ground location will not damage electrical components or cause erratic performance, go ahead, do the experiment. Bolt your Negative Battery cable to your Flywheel Cover and expose your high dollar components to this abuse. Prove it on your own Ski. Are you...

Ya, the Magneto must look like a 4th of July Fireworks show inside having most of the Current arcing thru the Stator, the Flywheel, the Cover, and then to the ill-placed Battery Ground. :oops: Might have even blistered the Crank Ball Bearings :(

Is that Negative Ground Wire connected to the Starter Ground Bolt or to the Bedplate? What is it connected to?

A bad/weak Battery can also put excess strain on the Stator... Battery might also have a bad Ground/Negative Post/Plate. The MSD also runs off the Battery. What is the model, brand and engine specs?

From Jetski Solutions: "Another interesting point is the "sparks when you let off the start button" syndrome. This always means one of two things......the cdi is bad, or the pulser coil is bad, or the wire from it to the e box is open."

Why a Number 9 and not a 5?

Yep, Lord Mounts are probably in a bind due to bad alignment. Align the Exhaust System Parts first without the Mounts and then see where the Pipe brackets end up. Also measure the actual space between the Pipe Brackets and the Cylinder Head, and the Block, and order your Mounts accordingly...

What Myself said plus the aged Fiberglass Waterbox develops Air Leaks via Rivets that have dropped their Mandrels. This gives it the perfect Air/Fuel mixture for a loud Boom just when you have your face right above the Waterbox. That's why it's called a Blaster :D

MSD Enhancers are still being manufactured?

Losing power at a critical time...no bueno

Did the Engine suffer any carnage as a result? Spill da Beans. Inquiring minds want to know...

Check for Air Leaks in the Engine, but also along the Exhaust System all the way to the Water Box. You can spray soapy water along the Exhaust System but not the running Engine. Is your Water box made of Fiberglass? The FG Water boxes are riveted and, then after time, the mandrels fall out...

Says the OEM 701 weighs 125 lbs???? No way...

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My experience has been that most Batteries last as long as the stated Warranty. The Battery Manufacturers have that down to a science. Those $35 Sigmas Tek batteries have a 6 month warranty and are great for putting in Skis for a quick sale or when cash is tight. But for personal skis, I...