Mercury M2 210 wont start, rebuilt last season, fuel system seems fine, help please!!

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alpine69

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Hi everyone

I have a 2001 Seadoo Challenger 1800 M2 210 tri-carb that was rebuilt last season as it threw a piston pin. Boat ran great at the beginning of this season, worked last week in water, although after resting in the water for a while it wouldnt start, and for almost an hour and after pulling the plugs and screwing around it finally did run fine.

Took it on a trip this week and it ran great for two days, brought it home and it wouldnt start when I put it back in the water, even after replacing the plugs with new ones. I took it to the marina that rebuiltrthe engine and it started 10 times in a row for them on the trailer, they couldnt find anything wrong with it. I towed it home and it started fine in the driveway, put it back in the water and it wouldnt start again. Now its back in my driveway and it wont even start on the trailer now..

I've:
-replaced the sparkplugs with new ones ($110 bucks yikes)
-checked that the fuel primer is working
-checked that the fuel pump is pumping
-checked the fuses on the engine
-battery is fine
-kill switch seems fine
-checked that all the connectors on the wiring harness on the engine are ok

It seems that it must be an electrical issue but I have no clue what could be causing this. ANY SUGESTIONS OF WHAT TO CHECK NEXT WOULD BE GREATLY APPRECIATED!!! thanks in advance

It's finally 110degrees out here in Canada, and I really want my boat back haha...
 
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