07-21-2006, 11:54 AM #1
Crank, piston and cylinder failour
Engine started loosing power fast then finaly refuged to turn over. Now I have the engine out and I realise that the crank is shot at the middle cylinder + the middle piston and cylinder is a waste to. Does anyone have any idea what could have caused this.
The ski is a Gpr1300-04 70 hours with some mods the latest installed 30 min before the failour was the keyway 3*
07-21-2006, 12:03 PM #2
Verify you didn't lose oiling on that cylinder, or suck in water...but it looks like an out and out crank bearing failure.
the gpr crank is a known issue. As the years go by, and the newer skis get a few hours on them, everyone is slowly realizing that not much has really changed since 2000... IMHO.
07-21-2006, 12:14 PM #3
Mark I run premix since my last piston+cyl. failour. I havnt seen any water in there. When the crank break does the piston and cylinder always get damaged too? From what I have read its the same crank from 2000 and up? Should be easy to find a good used one then. This ski is going back together bone stock and then sold. I will have enough on my hands when my trippel pipe ski gets here.
07-21-2006, 12:37 PM #4
When a crank SNOUT breaks, usually no damage to the cylinder and head.
When a crank bearing dies, it takes everything aluminum with it... including your head, piston and cylinder.
07-21-2006, 12:38 PM #5
- Join Date
- Feb 2006
- Birmingham AL
is it possible that the keyway added too much timming and tried to stick a piston? This resulted in beating the rod bearing out of the crank?
07-21-2006, 12:48 PM #6
I remember reading something about that you should upp your high speed setting on the efi when installing the keyway, well I forgot and left it on 2 maybe it got lean and overheated seizing the piston? On the other hand the other to sparkpluggs looked good. Maybe just tuff luck and a normal crank bearing failour as you suggested Mark.
07-21-2006, 12:59 PM #7Originally Posted by christian gpr
07-21-2006, 01:14 PM #8
Rich, I think you are right, sorry to rush you to send the Keyway here so I would get it in before the race. As it turned out I put it in and the ski ran great for 30 minutes. I drove to the race (9 hours one way) and the ski broke down on my second practice lap. All that rushing for nothing.
07-21-2006, 01:20 PM #9
07-21-2006, 01:37 PM #10
Looks like heat took away your oil barrier.
Did you increase your occtain to compensate for the advanced timing.
Did you do plug chops when tunning.
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