Author Topic: Hey guys. What do you think happened.  (Read 8959 times)

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chaddyg8

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Hey guys. What do you think happened.
« on: February 06, 2018, 05:54:01 PM »
Recent rebuild. Crank seals,piston and rings. Prob 50 miles on rebuild. Running great! I thought. Then a back fire and she bogged down and stopped. I pulled the pto side plug and the  electrode was bent up. Pulled the head and top ring was gone!

Vader440

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Re: Hey guys. What do you think happened.
« Reply #1 on: February 06, 2018, 06:18:03 PM »
Dang!  :(

chaddyg8

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Re: Hey guys. What do you think happened.
« Reply #2 on: February 06, 2018, 06:36:07 PM »
I know right!! Other side looks great. I don’t know if that back fire caused the ring to pop off or what happened but dang.... pretty bummed.....

Joel

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Re: Hey guys. What do you think happened.
« Reply #3 on: February 06, 2018, 06:36:51 PM »
I am thinking coolant leak on head gasket weaping coolant into cylinder.
79 Drifter 440, 79 Invader 440,82 Intruder,81 LTD, 82 LTD x2, 82 GT Prototype,82 Interceptor #519

chaddyg8

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Re: Hey guys. What do you think happened.
« Reply #4 on: February 06, 2018, 06:40:16 PM »
Hmmm I have the 2 piece head gasket. (The good ones) also temps from the new sunpro gauge where 160-190. And i wasn’t losing any coolent?

Joel

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Re: Hey guys. What do you think happened.
« Reply #5 on: February 06, 2018, 07:08:06 PM »
I had it happen on a  monohead Ltd once. The top of the piston looked the same and lost the top of the ring landing and yes the plug electrode was collapsed. See what some other opinions are.
79 Drifter 440, 79 Invader 440,82 Intruder,81 LTD, 82 LTD x2, 82 GT Prototype,82 Interceptor #519

chaddyg8

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Re: Hey guys. What do you think happened.
« Reply #6 on: February 06, 2018, 07:20:50 PM »
I appreciate the reply! Thank you.

mswyka

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Re: Hey guys. What do you think happened.
« Reply #7 on: February 06, 2018, 07:49:18 PM »
The only time that I have seen the top ring disappear we had an air leak.  Sled was really cooking too when she just died.  Found out my cheapo carb boot was not sealed tight to the inlet.  Mikuni boots and a fresh piston and she has been good for the last 12 years.
Intruders:  1978, 1979, 1981 Custom (Pink)
Invaders:   1980 440
Projects:    1981 Invader 440

gixxer6

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Re: Hey guys. What do you think happened.
« Reply #8 on: February 06, 2018, 07:52:45 PM »
I agree with mswyka, looks like a lean condition to me.  Too much air or not enough fuel. 

Interceptor398

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Re: Hey guys. What do you think happened.
« Reply #9 on: February 06, 2018, 08:20:22 PM »
What brand piston is that?

chaddyg8

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Re: Hey guys. What do you think happened.
« Reply #10 on: February 06, 2018, 08:24:47 PM »
It was a SPI.

Boomologist

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Re: Hey guys. What do you think happened.
« Reply #11 on: February 07, 2018, 09:39:35 AM »
Will probably have more clues when we see the sides of the piston.

kawhead

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Re: Hey guys. What do you think happened.
« Reply #12 on: February 07, 2018, 09:47:23 AM »
detonation....lean/ timing imo

chaddyg8

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Re: Hey guys. What do you think happened.
« Reply #13 on: February 07, 2018, 10:18:59 AM »
Thank you for the reply’s. I will get some pics of the piston soon.

chaddyg8

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Re: Hey guys. What do you think happened.
« Reply #14 on: February 07, 2018, 10:20:39 AM »
Here one. I’ll try and get a better one later.