Super Jet Rebuilt motor, things need to do before starting?

[AAlamo]

Hey everyone I just rebuilt my motor, its now on its final bore 61x cylinder 62t case. Replaced the total loss with stock electronics and replaced all of the fuel lines. What do I need to do before I go about starting it and riding it? I know that it cranks. And I know I need to take it easy for the first couple gallons. Any other tips or opinions?
Thanks
Anthony

 

[element3488]

run it a little richer on the oil mixture for first tank my engine builder also says run it very light for first tank. not alot of WOT mostly just half throttle and under.

 

[crazy4sand]

I start out buy doing 15minute rides 1/4th throttle let it cool then 30minute runs half throttle for the rest of the talk I double up on the oil and some say after one full tank brake in is complete i do another tank mabe 2 till i hammer on it,

My dirtbikes i do a 15-20gallon brakein

 

[Kny21]

You'll find many opinions on break in procedures..... heat cycles, rpm/hour ranges, breakin oil, etc.

I say add extra oil to the gas, let it warm up, then run it like like you normally would in everyday use but no WOT for more 10 seconds.

 

[dbattersby20]

I would also say run it off a hose breifly before putting it under load in the water.

 

[AAlamo]

Thanks guys I appreciate it

 

[Schmidty721]

Pressure test it first.

 

[Schmidty721]

My dirtbikes i do a 15-20gallon brakein

Damn dude, that's a long time!
On my brand new 4-strokes I do a couple heat cycles, ride it easy for an hour, change oil. Ride it harder for 2 hrs, change oil and then game on. New top ends I just take easy for an hour or so.

 

[AAlamo]

Ok guys we got a problem...when I originally took my engine apart and had it rebuilt it was due to a runaway ski because the crank seals had blown and the rear piston seized. So I had the engine bored, honed, rebuilt and I replaced my electronics, flywheel, and stator back to stock. So after getting everything prepped to start (compression 175 in both, mixed gas 30:1, made sure there was fuel in the lines), it started up right away, but then immediately began revving up high just like before I took it apart so I killed it right away. I did not have it on the hose. So what do you think? everything on the ski has been rebuilt except the carbs so Im guessing my problem lies there somewhere?? Its really frustrating how much work I've put in the last 2 months to try to get it running yet the same things happening. Let me know what you think I should do about it. All I want is a reliable ski thats going to run.
Thanks
Anthony

 

[OCD Solutions]

it's running lean because you don't have fuel primed thu the carbs. Just pucker up and wait longer, it should settle down after 8-10 seconds.

 

[Kny21]

Intake leak. Pull and put in fresh gaskets. While apart rebuild carbs and check intake, etc for cracks or anything else out of whack.


Edit: try OCD's suggestion first.

 

[AAlamo]

I put a little bit of fuel straight into the carbs before I started it. Should I put more? Or just leave it and try to start it up again?

 

[Kny21]

No, just enough to get it to fire and try to pull fuel from the tank. Try a couple times, or crank with the choke on or pull FA's and use your hand over the carbs. If your not getting fuel you need to look into lines or carbs.

 

[BruceSki]

If you plug the return fitting on the fuel tank, blow a little air pressure into the tank via the vent, and hold the return line from the carbs into a bucket it will force fuel through the carbs.

Then you know they are full of fuel and ready to run.

If it still runs away you might have the lines hooked up wrong or an intake leak.

 

[jetpilot08]

Did you pressure check the engine? If you want a reliable running ski this is a must. When I had my 550 I chased myself in circles before I took someone's advice and pressure tested my motor. Turns out I had a leaking crank seal. Save yourself the hassle and do it. You will know it is sealed correctly and it will take the problem out of the trouble shooting equation.

 

[SUPERTUNE]

Double check the idle screw and make sure your not adjusted too far open at the plates, also check throttle cable for any tension that might hold the throttle plates open.
Turn the low speed adjuster out one more turn for initial startup, once at the water you can adjust from there.