Seadoo 951 carb settings and timing after rebuild

[TheStone]

Hello all, I just finished a complete rebuild on my 2000 seadoo xp. The engine blew a rod bearing, and beat up the pto piston pretty bad. I went with a new wsm crank, and 1mm overbore wsm pistons. Clearanced the rave valves, and resealed the whole engine. Also replaced all the grey fuel lines. I have the ski back together, and verified that it cranks over, has spark, and really good compression, but have not tried to start it yet. My questions are, will the ignition timing need to be checked since there is a new crank? And will the carbs need to be adjusted since it it is overbored? The ski always ran well prior to blowing up, so I'm not suspecting the carbs were at fault, just a 20 year old ski that's lived a hard life. Thank you for your input.

 

[mikidymac]

No, no need to set the timing as long as you set the marks on the stator correctly and no need to adjust the carbs.
I would suggest you rebuild the carbs with all new Genuine Mikuni parts if you haven't already and a new fuel selector.
Also premix at 50:1 in addition to the oil injection for the first full tank of fuel.

 

[TheStone]

No, no need to set the timing as long as you set the marks on the stator correctly and no need to adjust the carbs.
I would suggest you rebuild the carbs with all new Genuine Mikuni parts if you haven't already and a new fuel selector.
Also premix at 50:1 in addition to the oil injection for the first full tank of fuel.

For break in I was planning on adding 2 oz for every gallon of gas, but i can bump that up to 2.6 oz for the 50:1. I will also use brp mineral oil in the injection system as well as premixed just for break in, then I will switch back to the xps synthetic that I've always run (in the oil injection only, no premix). I wasn't planning on going through the carbs, as I've never had any issues with them and they look really clean on the outside, but I'll look into doing it now. Any reason why the fuel selector should be replaced? Just curious. Thank you for your input.

 

[mikidymac]

No reason to go with mineral, just use the synthetic from the start just like seadoo did from the factory on your ski.

Absolutely do the carbs first. I can't tell you the number of new engines that have been killed from people not doing the carbs.

Like everything else on these the fuel selectors eventually go bad and you have already changed the lines so why risk a new engine on a stupid fuel selector.