ah crap...

[hickskateboarder]

went to do a plug chop on my not-even-completely-broken-in newly ported and bored jug, shut it off at probably 8k in 6th, pulling in the clutch at the same time as always, and while the motor was reving down it was going CLANK CLANK CLANK. i was like oh man, i hope thats just a product of the high compression, pipe and portwork.... i'm such a hopeful dreamer...

spark plug insulator failed... i was hoping that it just shot the insulator out the exhaust....

wrong again. i cleaned the head and piston up, the bore had some very small scratches, so i honed them out with very fine sandpaper, cleaned it all up, and went for it.... it started right up and seems to run just as strong as before, but i can't help but think it's not gonna be at it's highest potential now....

i never fouled a plug in either of my blasters the entire time i've had them, so they rarely got changed. LESSON LEARNED. spark plugs are cheap; change regularly.

 

[92blaster]

what is all that silver stuff on your piston and head?

 

[FLOTEK]

never heard of honeing using sandpaper ? if your still using that head like that ,i would say you are not running to its old potential even if your dynobutt2000 feels like it is

 

[89custom]

what is all that silver stuff on your piston and head?

he said the plug insulator. or marks from it.

 

[blastapole]

yeah thats the bare metal gouges where that insulator beat it up.

Sucks man.

 

[hickskateboarder]

they are pieces of insulator stuck to the head and piston. i cleaned them all up and sanded the head smooth.

 

[rz350guy]

hickskateboarder it looks like the piston is up quite a bit in the cylinder and there seems to be a cut head? is all your parts stock or everything cut

 

[2smoker85]

damn that sux man, sorry to hear it!

 

[Unstock240]

Was your head clearance enough? did the electrode get hit? That stinks what brand was the plug?

 

[hickskateboarder]

yeah, it was ported by angus kennedy, he mills the top of the jug b/c it has a negative deck height. also did some work to the head. makes mad power, but apparently blows up old spark plugs hahaha. Change Often!

 

[hickskateboarder]

yeah the plug is still a good bit back in the combustion chamber. squish clearance close, which is better for more power! it was an ngk br8es....

 

[blaster99]

srent u supposed to use b8es

 

[coreyownz]

so their was not enough clearance and the piston was hiting the plug? put another washer on it?

 

[89custom]

did you acualy use a old sparkplug for a fresh rebuild?

nay nay!

 

[hickskateboarder]

so their was not enough clearance and the piston was hiting the plug? put another washer on it?

no... how are people so thick. the spark plug was not getting hit by the piston. it was just an old plug, and the insulator got old, cracked, and fell off.

 

[Braapbraap95]

wow man that really sucks.

 

[blasterfreek30]

damn bro that does suck, shame shame for using an old plug

 

[Wildcard2]

blasters have a positive deck height from the factory, negative would mean the piston protrudes from the bore. As far as the plug goes the insulator must have been cracked prior to running it. I've seen this happen one time, the guy said he had dropped the plug and didn't think it would hurt anything. Are there any severe gouges in your piston? If so, I recommend you replace it as it's integrity may have been compromised and further damage can/will happen if your piston fails.

 

[hickskateboarder]

my bad, i had them backwards. it had a positive deck height from factory, it now has a negative deck height.

don't remember ever dropping the spark plug or anything, although it is very possible.

there are some small gouges in the top of the piston, but i don't think i would call them major. i couldn't imagine it's structural integrity was diminished too greatly. i guess i'll find out :-/