Thread: sl780 runs like shi*
06-08-2008, 10:04 PM #1
sl780 runs like shi*
Hey everyone, I'm back again. If you dont know already, i got an sl780 for free, and had to put a used piston and jug. Has run like a champ in the back yard, and finally got it to the water to try her out. At idle she ran ok, and half throttle not to bad, but at WOT the engine shakes really bad, and i could barely hit 15 MPH (just a guess though, MFD doesnt work). I took it out of water and it ran like crap on the trailer. Checked plugs, and cleaned them, but still no good. Any ideas why it always ran great, and just quit all of the sudden.
06-08-2008, 10:05 PM #2
How is the compression?
Have you cut 1/4 inch of wire off the plug end and screwed the caps back on?
06-08-2008, 10:12 PM #3
I'll check compression tomorrow. I havent cut off the ends, and can try to do it after my compression ck. Do you think its rev limiter shutting me down early. dont have the display working, so cant tell if i have a prob.
06-08-2008, 10:15 PM #4
06-08-2008, 10:17 PM #5
i'll have to check that. if I remember, there was a wire in the metal box that was unplugged, and i plugged back in. How can i see if anything is wrong if I dont have a display working
06-08-2008, 10:22 PM #6
Measure the resistance of the wire for each item that will put you into limp mode.
Check the service manual for specs and testing points.
06-08-2008, 10:27 PM #7
Thanks everyone, I'll update with compression and the wire issue. I'll have to check the service manual on all that stuff, cause im not to sure whats up, and how to do it. Also, where do I attach the spark plug wires when I crank engine and dont have them on the plugs. My seadoo has a post to put them on. What do you guys do
06-08-2008, 10:32 PM #8
You can use wire with connectors and attach toground.
I personally use a spark plug tester with an aligator clip so I can ground it to the head bolts. It also enables me to watch spark at each cylinder while testing for spark loss.
06-09-2008, 08:33 AM #9
- Join Date
- Jul 2007
- near Toronto, Canada
06-09-2008, 10:42 AM #10
Those pictured wires above spell disaster.^^^^^
I use the ones that look like the below photo and the aligator clip is removable so I can still use the tool in-line if I wish.
Last edited by ph2ocraft; 06-09-2008 at 10:45 AM.
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