Thread: Bad day at the lake
09-23-2013, 06:55 PM #1
Bad day at the lake
The wife and I took her STX out yesterday for a little ride. In under 15min, motor started surging, max RPMs dropped to 5500. Turned around and started heading back to the marina but didn't make it far. I should have just stopped when I knew there was a problem. Power fell off, and motor locked up. Got towed in by a very nice older couple. Got it home and started tearing it apart. I'm thinking maybe I'll get lucky and just need a piston.....NOT! Burned a hole in #3, guess I have a carb issue. But that's not all folks! Because of the hole and the lean condition, no fuel/oil mix was swirling around in there, so the rod bearing melted to the crank. Damn it! Just bought this one, have only been on it for 80 minutes, now I have to build a motor. The joys of multi cylinder 2-strokes.
Make note. If you notice a problem, shut it off, get towed in, and get it checked out! I probably could have saved the crank if I had done that.
09-23-2013, 07:53 PM #2
09-24-2013, 06:04 PM #3
- Join Date
- Jul 2013
Are you pre-mixing? I haven't had any problems with my big bore GPR
09-24-2013, 06:36 PM #4
09-24-2013, 10:35 PM #5
09-25-2013, 09:06 AM #6
No. It means the air/fuel mixture didn't have enough fuel in it and the flame front was VERY hot, causing the hole. When it doesn't get enough oil, the sides of the piston will seize to the cylinder.
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