[700xxmaniac]

okay, a few months ago i was blowen around in the powder in 5th pinned when she stood up and stalled... i started it back up and it sounded like the valves were off. so on my way back home she locked up. and i havent been able to pull her apart till today.

i droped my exhaust valves. so the piston and bore are f&*ked i think the head can be save. gona talk to bo about it.. my crank looks good!

im thinking a 730 kit and port
some pics... lol the piston is missen some meat

 

[AusTrx700xx]

i think your timing chain tensioner failed, you would have to be the unluckiest person to ahve two valves break at the same time, was the cam timing lined up when you pulled it apart?

 

[EHSRACING]

it looks really good for dropping a valve you can save quite a bit of that actually the head is going to need all new valves probably a couple seats and guides i dont usually mess with trying to save a few valves even if they look ok. one valve probably broke and hit the other one

Just so you know

"i started it back up and it sounded like the valves were off. so on my way back home she locked up. and i havent been able to pull her apart till today."

i know people dont usually know but if you stopped here and pulled it home it would be a $200 fix instead of $1000 plus

 

[700xxmaniac]

yeah i was in the middle of a snow covered feild and there was no way i coulda pushed it out and nobody was around on sleds..but i didnt rev it high or anything and it was almost on idle when she went...

the intake looks clean but im gona replace em anyway... do u think my crank is fine... there is no visible damage to it. i am gona pull her apart and get all the shrapnel thats in the case.

 

[Crash21]

What could have caused that?

 

[Britalican]

wow, that piston is F'd up!

 

[700xxmaniac]

ikr!! lol i took the engine out today..

 

[Crash21]

What would have caused the valves to drop?

 

[700xxmaniac]

stressed piston hiting them

 

[Britalican]

stressed piston hiting them

is that like a stressed husband beating his wife? Then she grabs a gun and puts a hole in him...:lol:

 

[700xxmaniac]

lmfaooo. gezz 2 wifes.... damn ppl are crazy

 

[AusTrx700xx]

im still thinking that you may have had the timing chain jump causing the piston and valves to meet, personally i would be looking into exactly why it happened caus both valves dont break similtainously bue to wear and i would hate to put another motor together to find it does the same thing a few hours later

 

[skier207]

im still thinking that you may have had the timing chain jump causing the piston and valves to meet, personally i would be looking into exactly why it happened caus both valves dont break simultaneously due to wear and i would hate to put another motor together to find it does the same thing a few hours later

x 2 ...

 

[700xxmaniac]

well i hade to cut the timing chain to get the cam out so its getin a new one no matter what.. i think i had bad gas in it and when it stalled it cause really bad detonation and warped the piston.. and that it hit both valve untill they craped out.

now is the fun part... pullin the motor apart to get all the remains outa it

 

[09RappySE]

Ain't no way bad gas caused all that.....my guess is you somehow jumped timing.

 

[700xxmaniac]

im wonder how would that happen....

 

[09RappySE]

Could be that your tensioner failed or the chain had too much stretch and it jumped a tooth or the drive sproket for the timing chain on the crank could have moved. I have heard of the crank sproket moving before with the raptor, it is rare, but I have heard of it....I don't know if the XX could have that happen or not. Did you check to see if it was in time before you took it apart?

 

[Baxter]

I would like some better pics but from what I see you dropped one valve and it took out the other. Better pics plus the valve remains would help out. Can't quite figure why you would cut the cam chain , other than you snapped the cam aswell.

 

[xx700xx]

Ain't no way bad gas caused all that.....my guess is you somehow jumped timing.

+1, my SRX saw the end result of bad gas. It would either blow a hole in the piston or even melt away part like my sled. I definitely think there was a timing issue here.

 

[Brokenbones]

well i hade to cut the timing chain to get the cam out so its getin a new one no matter what.. i think i had bad gas in it and when it stalled it cause really bad detonation and warped the piston.. and that it hit both valve untill they craped out.

now is the fun part... pullin the motor apart to get all the remains outa it

Why did you have to cut the timing chain?