02 GTX DI 951 crank no start

[Jman5002]

So I got this jet ski with a blown motor (PTO cylinder). It ran on one cylinder but I used a camera and saw a bad piston. This was 6 months ago.

Finally got time ordered new head cylinder and pistons. Rebuilt the top end I broke the solenoid valve going to the exhaust valves/air compressor. Replaced that with a used one (only thing that changed).

It’s cranks and cranks but will not fire. I put a tiny amount of gas down the spark plug hole 1 or both cylinders and it fires Immediately and dies right after.

I’ve got 119 psi compression in both cylinders. I’ve checked the air compressor that’s 81 psi. I have good spark the fuel and air injectors both spray when cranked over. I don’t have a fuel pressure gauge but might have to buy one but again it sprays good fuel out the injectors.

I’m at loss it seems like a lack of fuel problem but I don’t want to just throwing expensive injectors at it when I don’t know if that’s the fix. Am I missing something silly.

Any help will be appreciated.

 

[mikidymac]

You need to check fuel pressure. It is very important on these.

 

[WaarrEagle]

Regardless of fuel pressure, which you absolutely need to check, sending off the fuel injectors for testing and cleaning is a good move. I used Yamaha Fuel Injectors a few years ago for my DI injectors.

It may be a clogged injector or poor fuel pressure that led to the engine failure in the first place.