Thread: 07 gpr crank failed
08-18-2008, 09:45 AM #1
07 gpr crank failed
I have an 07 gpr with around 68 hours. I'm one month past my 1 year warranty. Stock reeds with milled Jim head (150psi) and 4 degree keyway. Running premix 40:1 (amsoil interceptor). Anyway about 2 weeks ago I took the ski out, warmed it up properly, and started heading to ocean. The ski felt a little laggy but it was also humid that day. I was WOT then all of a sudden felt like someone jammed on the brakes. I pulled the head right from there after not having any compression in cylinder #2 and the piston was shredded and dome was mangled. Cylinder has a couple score marks. I thought I had lean seizure and tore the engine down last night looking for an air leak or something only to find the crank bearing let go. Any idea why this would happen? I had no water in crankcase or anything. Will post pics up later
Last edited by ecpChris; 08-18-2008 at 10:18 AM.
08-18-2008, 09:50 AM #2
08-18-2008, 09:54 AM #3
looks almost exactly like it. I'll put some pics up later on tonight. Sucks my ski is only 13 months old.. Looks like a conversion is in my future.
08-18-2008, 10:02 AM #4
08-18-2008, 10:06 AM #5
the two of yours look like mine from back in June. Mine had 10 hours on it.
Argument could be made that the crank let go after it stuck.
08-18-2008, 10:11 AM #6
gprjersy and i both run open TB's in the surf
spoke to some cool crank guys and they think a gulp of water a few months ago would be enough start the crank bearing smear off,once the cage has recived some water damage...
you would think i would know better have a jump boat for rough water but i love the lowell hit,so i might get jump ported now and keep 05 for nice days although i will have a lid on my air box now....called shuting the door after the horse had bolted
08-18-2008, 10:19 AM #7
my crank still spins just the rod for cylinder #2 moves like a square wheel..
08-18-2008, 10:25 AM #8
08-18-2008, 03:16 PM #9
Were you seriously running open TB's while jumping in the surf??
I'm suprised you made 68 hours!..
08-18-2008, 03:37 PM #10
lol yeah. My hull is pretty dry for the most part so I wasn't worried about it. Actually having just a gutted stock airbox worried me a little more as I have seen 2 of my friends take on water in their gprs that was above the opening for the intake. the water just pooled in the airbox and in the tb's until I took it off and drained it. I know there is a little rubber drain on the stock airbox but it didnt' work too well on either
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