For those who wanted to see it...

[rebelpacket]

The aftermath. Bottom end appears intact. Bore may be salvageable. Not going to be racing for awhile though.

[KillBill]

OUCH!

[SilverDragon]

eek. I'm buying that T handle from ya for $25.

[highsider]

Yikes....I wasn't present for the carnage, which bike was this?

[rebelpacket]

Its the Husky. Popped in turn three on Sunday practice.

[oreo_n2]

What the EFF??? Thats more than a POP!!!!

What happened? You were adjusting valves the night before right? NEVER TOUCH MY BIKE!


just kidding man... get that thing fixed. looks like a new head is in order. Seriously... what happened??? Did a socket get in there and get hammered to bits?

[Doc]

That last picture makes me want to cry.

But on the other hand... ONE LESS MOTARD!!!

I kid, I kid. Sorry to see this man, no replacement for displacement.

[ChR1s]

Whoa. What gave first?

As an owner of a new TE450, I'm interested to hear how the repairs go.

[TheIglu]

Richen that thing up! (just to be safe....)

Doesn't look like it melted but you have more than enough power. Not sure if the Husky's come lean from the factory (as most EPA approved bikes do). I'd go up a couple jet sizes just to keep the piston a little cooler.

That blows man. The good news is that Joel is so fast on his that I'm sure you could use his head and he'd still be in the 1:28's. Then everyone wins!

How many hours on your top end?

[TLRMan]

What the hell you got rattling around in there?
I noticed a missing exhaust valve. Did you drop one?
More damage by foreign object, than by a too lean/detonation run.

[tls25rs]

So what is the list of parts that you need? We need to get you back out there!

Are any of the damaged parts salvageable with machining etc. or do they all need to be replaced? Got some friends that do this kind of stuff that might be willing to help if I ask.

Let me know how I can help get your motor back together bud, wont be as fun without you out there pushing me to go faster.

Joel

[Paul_E_D]

Dropped valve is likely. I'd guess the stem actually broke. They make them thin to get them light. NEW valves are probably required on a schedule.

[rebelpacket]

Right-hand exhaust valve is currently having a in-depth conversation with the left hand intake valve. Snapped at the stem. Not sure why it happened. Valves we're in spec. Jetting may have been off for the cold morning, but not enough for this.

Calling a bunch of racer-sponsoring companies looking for used and new heads. This one is going on the "Offerings to the god of speed" shelf. (Thanks Burt).

Thanks for the offers for help. Joel, the only way I'm getting out there sooner, is if I knock over a 7-11. I'm not that desperate yet.

[stevecbr900rr]

Holy shit never seen anything like that before. Looks like it went through a meat grinder.

[TLRMan]

You didn't happen to have the cams out did you?

[rebelpacket]

I did have the cams out. But it was two race weekends ago. The bike ran like a top with no issues, and I put them back in correctly, of that I'm sure.

[Evil_Weasel]

ouch dude, "that sucks" seems like abit of an understatement, but it about sums things up. hope to see you back out there soon. the DNF pit is going to be vacant by the time i'm recovered.

[rebelpacket]

Ah-hah! George @ Uptite Racing (guy knows his Husqvarna's) mentioned the decompression/auto-decompression bit, and it started to click. My right-hand exhaust valve hit first, and broke the valve off the stem. That accounts for the first "ka-klank" I heard. Then that peice slammed into the head, and through the piston (the second "ka-klank"). Then it came to rest inbetween the lefthand intake valve and its seat (the last noise).

My belief at this point, is either I pulled, or somehow my leg came in contact with the decompression lever, and it pushed the valve just far enough to get banged. There is no signs of serious overheating in the motor, whats left of the piston doesnt' look terrible, and I don't see bluing on many of the steel parts.

Thats all theoretical at this point, but its the only thing that makes sense.

[The Snowman]

I noticed a missing exhaust valve. Did you drop one?

I think the motor monster ate it.

Damn, that's a lot of damage.

[SSearchVT]

OUCH!!!
Given the amount of damage to the top of the piston - I'd keep going taking things apart. The crank and connecting rod are most likely tweaked.

[SVRACER01]

i guess you will either be relocating that decompression lever or taping it up.

[ssg]

Valves we're in spec.

as in clearance(s) or the valves themselves?

Im wondering if a slightly stretched valve got fatigued and the leg-to-decomp trick started/finished the job...either way that's a nasty sight and I'm feelin for ya

[ssg]

did you find all the popcorn from that piston getting perforated? did it make it to the oil pickup/filter or did things just lock up at a certain point? (looks like it kept spinning for a bit).

[gmdboston]

Dropped valve is likely. I'd guess the stem actually broke. They make them thin to get them light. NEW valves are probably required on a schedule.

Sorry Paul, but you're way off. It clearly an electrical problem. When the valve stem broke and the valve hit the piston, it caused the connecting rod to bend and the piston to get jambed in the cylinder bore. At the same instant the now floating valve head was pummeled between the cylinder head and the piston dome. This caused a dramatic loss of RPM's and a resulting loss of intake tract velocity. Because the motor could no longer sustain combustion cycles, the crank stopped spinning. Once the ECU was no longer receiving a signal from the crank sensor, it will not fire the secondary coil. This causes an immediate loss spark. See? It's clearly electrical.

[highsider]

A simple "no shit" would have done, Pete. You're mean.