Thread: Dont be stupid like me
06-29-2011, 01:23 PM #1
Dont be stupid like me
Eight PWC over 18 years, and I never had a major mechanical issue...until now. My '94 SLT 750 had the #3 carb dumping tons of fuel at idle last year, so I turned the low speed jet down all the way, and it was rich at start-up and perfect at WOT.
Then my neighbor (who lost a leg in Afganistan) wanted to buy a 3-seater to try and ride, so I sold him this one cheap. But before I delivered it, I figured I would be nice and fix the carb. Turns out the needle valve was sticking so I spent $10 and replaced it. Dropped it in last week, and it ran GREAT.
Anyone want to guess what happend?
06-29-2011, 01:54 PM #2
It leaned out and toasted a piston.....right?
06-29-2011, 02:08 PM #3
yup! I totally forgot to turn the jets back up to stock setting, and burned a hole in #3 after two days of riding. Now Im praying my WSM order comes in by Friday so they can ride this weekend, reguardless of me loosing my ass in this deal.
So dont be like me kids, take your time and go over EVERYTHING.
06-29-2011, 02:52 PM #4
- Join Date
- Aug 2006
- Homer Glen Il.
been there done that more then once just shake it off and go again
06-29-2011, 03:17 PM #5
Im getting there, I just hating making a big mistake like that. It'll only take a few hours to pull the jug and replace it, but I'll be kicking my own ass for a while.
BTW: I had the jugs bored and honed when I rebuilt the top end, and only put about 25 hours on it in a two seasons. Should I go with the new rings, or just re-use the old ones? I'm not going to have time to hone it again if it suppost to be on the lake this weekend.
06-30-2011, 09:38 AM #6
thats a good thing your doing there
you might lose your ass on the deal but he lost his leg protecting your freedom to me you still come out on top
06-30-2011, 11:55 AM #7
Don't kick yourself. Yeah, you're out a little money but these things happen.
I just got my project SL750 sold. I worried about something just like that happening so just for sake of safety I set all the high speed needles about 1/8 to 1/4 fat. It knocked WOT RPM down a bit, but I preferred to know there was plenty of wiggle room rather have that ski on the bleeding edge.
I did something similar about 4 years ago to my own ski. Installed a reman engine (long story) and the knucklehead mechanic (me) didn't set the carbs right when it went back. Got 1 season of riding before I had to put in a new top end because it ran too lean Lesson Learned!
06-30-2011, 01:01 PM #8
07-01-2011, 10:46 PM #9
So its all going down tomorrow. WSM piston kit, base seal, head gasket, and 3 coolant gaskets = $80.
Is breaking in one cylinder the same as a new motor? I dont mind dumping extra oil in the fuel tank and riding for a while at 1/2 throttle, but a whole tanks worth would SUCK on July 4th weekend!
07-02-2011, 12:03 AM #10
- Join Date
- Jul 2007
- near Toronto, Canada
Same break in process for one cylinder as three. The one cylinder doesn't know or care about the others. It just needs to be broken in.
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