Head/Piston explosion update
#1
Head/Piston explosion update
I spoke to a professional mechanic today and showed them my head and piston. He told me that what caused this was very clear and it was because I was simply running way too lean. He said that he had seen this before and there was no doubt about it. The thing is, I was running the richest Dynojet(#132) offered in the kit. I had the needle 3rd notch down with two washers on top. Granted I was still running the stock #35 pilot jet. I would like to know where I can get the #38 pilot jet for when I get everything back together.
Here are the pics for anyone that never saw them:
Here are the pics for anyone that never saw them:
#4
Too lean? Man...that's hard to believe. Granted the mechanic had the benefit of getting to inspect your parts in the flesh, but I'm not sure I'm seeing anything indicating a too lean condition. I'm able to speak very bravely from afar tapping on my little keyboard here...LOL!
#5
Chances are, he is right. I was running way too lean. Too much air and not enough fuel. I had the bike really opened up.
I'm just telling you what the mechanic told me. He said that I simply burnt everything up and that's why the valve stuck and I eventually lost it.
#7
I imagine that the bike will be fine after I reset the camshaft back to normal with either the #128 or #132 main jet. But I need to install the #38 pilot jet. Anyone have a link where I can order that?
#8
If you talk to the mechanic again, please ask him for an explanation on his diagnosis. Several of us here would like to hear it.
On the KLX300 with the California needle, if you take the top of the airbox off and remove the butt plug from the muffler, the engine gets so lean that it hardly runs above mid range. I believe you said that yours was running strong when it blew?
Ride on
Brewster
On the KLX300 with the California needle, if you take the top of the airbox off and remove the butt plug from the muffler, the engine gets so lean that it hardly runs above mid range. I believe you said that yours was running strong when it blew?
Ride on
Brewster
#9
If you talk to the mechanic again, please ask him for an explanation on his diagnosis. Several of us here would like to hear it.
On the KLX300 with the California needle, if you take the top of the airbox off and remove the butt plug from the muffler, the engine gets so lean that it hardly runs above mid range. I believe you said that yours was running strong when it blew?
Ride on
Brewster
On the KLX300 with the California needle, if you take the top of the airbox off and remove the butt plug from the muffler, the engine gets so lean that it hardly runs above mid range. I believe you said that yours was running strong when it blew?
Ride on
Brewster
#10
Interesting - I agree with him that the culprit is very clear, I just can't bring myself to agree with him on what that culprit was though. How a lean situation causes valve dents in the piston is a bit beyond me, but he probably knows a lot more about engines than I. Did he offer any detail on the link between "Lean running" and "valve connection"?