650/X-2 88 650sx piston and head damage, WTF!?

[rafaelbachman]

so my ski died on me the other weekend couldnt get it started and had really low compression. Here are some pics of what i found when i pulled the head off also my head bolts dont torque down some of the studs seem to be pulling out when i twist the bolts but when i pulled the head off it doesnt look like the studs are coming out of the block. So... my question is does anyone have any studs i can by for the 88 650sx and who has a head i can buy and how do i remove the engine? do i need any special tools such as driveline holder?? Also what could have caused this kind of damage, cylinder head gasket is aluminum and does not look to be blown.

 

[rafaelbachman]

what is recommended head replacement? PJS, Westcoast, mariner?

 

[Scraggly]

looks like the crank let go and beat up the piston and head. i would recommend tearing it down and checking everything.

 

[rafaelbachman]

in the process of doing that right now. do you know any torque specs for the cylinder base? I know the head torque is 22ftlb

 

[Thirdsetjeff]

Yup, Mine did the same thing... Brand new rebuilt for $700 with 2 year warranty from SBT..

 

[650sxSteve]

Crank seal must have gone. I had the same issue. basically an 800$ fix lol.

 

[aytee]

found the same thing on mine when i opened it up... simple fix... replace complete...

 

[thrasher204]

sucks but hey its an excuse to upgrade

 

[kevbo]

That 25 year old rusty crank finally lost a bearing retainer.

 

[braden]

Same thing happened to my x2, seemed like a good excuse for a full rebuild of the ski as well as the motor. Check your bores carefully, mine cracked the bores so I needed new cylinders too, you don't want to rebuild it twice if you miss something