Need Help...spark plug recess question

1 reply to this topic
  • torrmentor

Posted June 20, 2007 - 02:29 PM


Gray & Gang-
Really upset with myself. I was being hasty when I went to wash my bike the other day and got some water/dirt in the little drainage hole that funnels water away from the top of the cylinder/spark plug. I usually plug it with duct tape.
I obviously can't get down there to remove the debris(it's really not much,and I guess it'll have to stay there 'til I remove the cylinder in the future), but should I leave the spark plug out and cap off so the air will remove the moisture instead of sealing it all up, or should I carefully install my new plug and the heat from the next ride will evaporate the moisture right out the hole???

The bike has been running a bit rich, the top of the piston looks really dark. How much carbon build up on the piston should I be able to see through the spark access/ what is the normal range of color? Thanks

'05 YZ 450; 13 hours total

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  • CaptainKnobby

Posted June 20, 2007 - 04:09 PM


Just take compressed air and blow out the hole.......As far as carbon on the top of piston goes usually determines what type of fuel you have used, Ive noticed when I rebuilt the top end on my 250 2 stroke it had a lot of carbon on the top when I used pump gas of 93 octane and when I used 114 there were hardly any.... maybe just a little spot the size of a dime on top of the piston. Although I havent had my 06 450 apart yet but I assume it will be based the same way.

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