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PostPosted: Mon Feb 06, 2017 11:21 pm 
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Hey all, I suspect my bike's piston is hitting the spark plug. I have been trying to start my bike for some time and have no luck. I pulled the new plug to put the old one back in and saw the tang had been crushed down to nearly touching the electrode. Also,when ever it hits TDC, I can hear a "ting".

Is it time to part this thing out? :bang:

I have apparently ended up with a lemon!


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PostPosted: Mon Feb 06, 2017 11:25 pm 
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What has changed? Assuming you have the right spark plugs...

(This doesn't just happen)

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Last edited by Max Kool on Tue Feb 07, 2017 12:52 am, edited 1 time in total.

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PostPosted: Tue Feb 07, 2017 12:21 am 
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It's virtually impossible for the piston to touch the spark plug unless there is something major wrong inside the motor.
Time to remove the head and figure out why it won't run.

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PostPosted: Tue Feb 07, 2017 12:53 am 
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Max Kool wrote:
What has changed? Assuming you have the right spark plus...

(This doesn't just happen)


I recieved it in a non -running condition. I thought it would be something simple like carb clean, new plugs, gas, and a starting technique. Perhaps it has always been this way. The new and old plugs should definitely be correct, but I will double check.


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PostPosted: Tue Feb 07, 2017 1:17 am 
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What Procycle said, pull the top end off and take look. One thing is for sure, something is wrong....

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PostPosted: Tue Feb 07, 2017 4:00 am 
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I have heard that "ting" sound on perfectly healthy engines too. Not sure where it comes from (possible the automatic decomp mechanism) but it's for sure not the spark plug.

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PostPosted: Tue Feb 07, 2017 9:33 am 
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If you are concerned about the piston, go to your local harbor freight and purchase a bore scope. You can thread it down the spark plug hole and see the top of the piston without disassembly. If you have had a spark plug hit the top of the piston you will be able to tell by any damage on the top of the piston crown. if you have good compression disregard what i am about to say next. Have you checked your valve lash? I have seen valves get so tight that they are held slightly open during the compression stroke and will not let pressure build. Plus you should look over your valve train to see if all of your springs, valve keepers, and adjusters are all in tacked. if you see damage that could be evidence of a larger failure like a bent or broken valve.. Hope this Helps :good:


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PostPosted: Tue Feb 07, 2017 11:35 am 
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Dino de Laurentiis wrote:
I have heard that "ting" sound on perfectly healthy engines too. Not sure where it comes from (possible the automatic decomp mechanism) but it's for sure not the spark plug.


The tang of his spark plugs get smushed....there is contact

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PostPosted: Tue Feb 07, 2017 2:01 pm 
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Max Kool wrote:
Dino de Laurentiis wrote:
I have heard that "ting" sound on perfectly healthy engines too. Not sure where it comes from (possible the automatic decomp mechanism) but it's for sure not the spark plug.


The tang of his spark plugs get smushed....there is contact


Maybe, but not between the piston and spark plug. There's at least 2-3 cm between the top of the piston and the spark plug, and the piston would hit the lower portion of the combustion chamber long before it hits the spark plug. If there are loose pieces inside, like a valve or pieces of piston, well, then possibly, but I'm pretty sure that would've had more dramatic consequences long before the tip of the spark plug gets affected.

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PostPosted: Tue Feb 07, 2017 2:08 pm 
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I guess you're right, could be the remnants of a valve.

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