Author Topic: Over revved the $h!+ out of her :( (Read 3546 times)

Greenducky55 · « **on:** April 11, 2013, 12:57:22 PM »

So last night was riding with my buddy we both decided to get on it good since neither of use really have since we got our bikes togeather. Was at about 6800-7000 rpm in 4th gear when she popped out of gear.... So as you can imagine revs went to the roof never really seen how high but once she came down I then hear the valve train really loud though my helmet. Was able to limp 2 miles home and park her. But have not been able to asses the damage. I'm expecting possibly a bent valve? I'm hoping my pistons arnt damaged supposed to ride to the coast Sunday. I'm hoping to just swap my k3 head onto my k1 with my k1 cam hopefully all goes well. Any ideas? I have an extra 836 head gasket and valve cover gasket.

lucky · « **Reply #1 on:** April 11, 2013, 01:00:18 PM »

Just wait and see.

Greenducky55 · « **Reply #2 on:** April 11, 2013, 01:02:58 PM »

Ya pretty much where I'm at.

ekpent · « **Reply #3 on:** April 11, 2013, 01:18:32 PM »

Pull the inspection caps and check the valve tappets etc. before doing a teardown. Maybe you got lucky and just spun an adjuster nut loose and is tapping the cap. That 836 though adds another dimension with its more power etc. Good luck,hopefully not fatal.

Greenducky55 · « **Reply #4 on:** April 11, 2013, 01:31:07 PM »

Ya ill have to check I did just recently adjust the valves too and I don't remember being very aggressive with tightening. But well see I hate that I'm stuck at work for another 6 hours still

Jerry Rxman Griffin aka MuthaF'er · « **Reply #5 on:** April 11, 2013, 01:36:09 PM »

If it's noisy and not running right my guess would be a bent valve hopefully without damage to the piston when it hit. If it's this bad it's locked up. Missed 1 to 2 at WFO.

ekpent · « **Reply #6 on:** April 11, 2013, 01:39:32 PM »

That piston needs to go in the Hall of Fame Jerry. It is so bad its almost pretty. Thing is totally hammered.

70CB750 · « **Reply #7 on:** April 11, 2013, 02:12:50 PM »

Quote from: Jerry Rxman Griffin on April 11, 2013, 01:36:09 PM

If it's noisy and not running right my guess would be a bent valve hopefully without damage to the piston when it hit. If it's this bad it's locked up. Missed 1 to 2 at WFO.

$HIT! Took me a while to realize what I am looking at. What a picture, Jerry. I hope I never see it myself.

Bailgang · « **Reply #8 on:** April 11, 2013, 02:13:49 PM »

That piston looks just like the one in the 750F engine from a parts bike I picked up years ago. I knew I was in for a treat when I removed the valve cover and saw the #1 int valve was nowhere to be seen.

flybox1 · « **Reply #9 on:** April 11, 2013, 02:31:06 PM »

Quote from: Jerry Rxman Griffin on April 11, 2013, 01:36:09 PM

If it's noisy and not running right my guess would be a bent valve hopefully without damage to the piston when it hit. If it's this bad it's locked up. Missed 1 to 2 at WFO.

that deserves its own lighted case in the man cave

Roach Carver · « **Reply #10 on:** April 11, 2013, 03:48:39 PM »

Like was said. Check your valves. Ive done the exact same thing and all i had to do was adjust the valves. This is a common occurence. Fingers crossed for you.

Greggo · « **Reply #11 on:** April 11, 2013, 03:53:39 PM »

Quote from: roach carver on April 11, 2013, 03:48:39 PM

Like was said. Check your valves. Ive done the exact same thing and all i had to do was adjust the valves. This is a common occurence. Fingers crossed for you.

+1

Greenducky55 · « **Reply #12 on:** April 11, 2013, 04:00:19 PM »

Thanks guys. And holly hell I'm pretty sure it's not like that lol. That's a great paper weight lol.

Garage_guy_chris · « **Reply #13 on:** April 11, 2013, 05:10:27 PM »

M'mmm aluminum donut.

That is one hell of a piston failure, never seen one like that before, i have a CB450 piston that burned a 1/2" hole right thru the center

scottly · « **Reply #14 on:** April 11, 2013, 05:46:35 PM »

Quote from: roach carver on April 11, 2013, 03:48:39 PM

Like was said. Check your valves. Ive done the exact same thing and all i had to do was adjust the valves. This is a common occurence. Fingers crossed for you.

2+ When it happened to me, the top half of an adjuster screw snapped off. I found the broken piece with the lock-nut still attached after removing the cam cover.

madScientist · « **Reply #15 on:** April 11, 2013, 06:13:54 PM »

That piston is epic!

I wasnt sure what the reference was until i saw the wrist from the rod.

Greenducky55 · « **Reply #16 on:** April 11, 2013, 11:04:47 PM »

Found the problem lock but rattled off and adjuster was allthe way backed out. Haven't found the but yet gonna pull the valve cover Tomarrow and find her. So glad that's all she had wrong. Meet to clean up the tip of the valve though.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #17 on:** April 11, 2013, 11:23:03 PM »

I'd say you are one LuckyDucky

ekpent · « **Reply #18 on:** April 12, 2013, 04:31:26 AM »

Do you have to pull the engine or are you lucky enouph to have a frame kit ? Good reminder for all to snug those locknuts up well

Greenducky55 · « **Reply #19 on:** April 12, 2013, 04:52:59 AM »

Actually don't have a frame kit yet but gonna build a relatively simple one tomarrow

bjbuchanan · « **Reply #20 on:** April 12, 2013, 05:17:12 AM »

I did the same thing 2 weeks ago but my adjuster nut was hanging on by a half thread just gmering away the tappet cover. Why don't you stick a magnet in there instead of all that extra work

Greenducky55 · « **Reply #21 on:** April 12, 2013, 08:09:47 AM »

cant even see the nut anywhere in there is the problem. plus im tired of my valve cover gasket leak lol.

Greenducky55 · « **Reply #22 on:** April 12, 2013, 05:58:16 PM »

My home made frame kit. I still need to clean it up and paint everything but gonna work out damn good I believe

Jerry Rxman Griffin aka MuthaF'er · « **Reply #23 on:** April 12, 2013, 06:02:09 PM »

Did you pull the oil pan yet?

Greenducky55 · « **Reply #24 on:** April 12, 2013, 08:22:04 PM »

I pulled the vale cover and found the nut while I was in there I retorqued my head an everything

bjbuchanan · « **Reply #25 on:** April 12, 2013, 09:07:52 PM »

If you trim those bolts up and round off the edges and make it look pretty that is essentially the frame kit, you did it correctly. Spend 10 mins with a grinder and dremel and it will look great

Vinhead1957 · « **Reply #26 on:** April 13, 2013, 08:09:33 AM »

You were very lucky. Time to get back on the road

MRieck · « **Reply #27 on:** April 13, 2013, 09:35:50 AM »

Quote from: Jerry Rxman Griffin on April 11, 2013, 01:36:09 PM

If it's noisy and not running right my guess would be a bent valve hopefully without damage to the piston when it hit. If it's this bad it's locked up. Missed 1 to 2 at WFO.

......and kept riding for 20 miles.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #28 on:** April 13, 2013, 04:54:29 PM »

Not real lucky! Bike had 5-6K miles, less than 1 year old, engine trashed and I was offered $500 for the whole $1800 bike as is. That piston (or better yet the weed and the purple passion I was drinking) at Daytona in 1976 when I was attempting to clean off the sparks plugs prior to very confidently taking on a 900 Kaw straight up is what turned me into an unqualified CB750 to 812 to 900 (see NEW piston) and upcoming 1000 wrench

I'm still learning and getting better. I've kept that souvenir all these years but I did lose track of the valve head somewhere along the way.

Michael, I wasn't THAT messed up to ride it 20 more miles! Buzzed, yes! Hey, I was 24 OK

and there was NOT a piece of tail that got turned down either (as long as no one saw me). It went BAM somewhere between 10,000 and 12,000+ when I missed 2nd. Bad habit of not letting off the throttle (I now have a Dyna 2000 with rev limiter set at 10,000 with much stronger springs). When they go BAM you shut them down. I immediately pulled the clutch, pulled over, got off, looked for oil leaks and massive holes caused by rods (no leaks/holes), hit the starter button (nothing), jumped on the kick starter (fn locked), then told the Kaw guy to go get the trailer and some help.

News:

Author Topic: Over revved the $h!+ out of her :( (Read 3546 times)