Blown up 700 Triple

To me you guys are reading way too far into this. To me it looks like you lost a retainer, the ring rotated and clipped the port. Nothing more, same thing happened to my brother's Panther a month ago. Here's some pictures to compare.

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Look familiar? Definitely not det or lean because it only runs a single carb for both cylinders. Lost a retainer and spun the ring and clipped the port. Typical failure sadly.

Jeremy
 
Well got it up and running tonight, got a new cylinder for it and new piston and rings. Also went with the full head gasket and raised the needles one clip to 2nd from the bottom with washers under. Runs beautiful now, nice and rich on the needle. I will check wash after this weekend and see what it looks like.
 
musselman said:
Hmm that does look very similar. This is not common for yamaha triples though, especially with only 600 miles on the piston.
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When you did your overhaul, what pistons did you use? I only ask because this engine turns out to have been recently overhauled as well. sometimes it's just dumb luck.

Jeremy
 
HndaTch627 said:
snip - Look familiar? Definitely not det or lean because it only runs a single carb for both cylinders. Lost a retainer and spun the ring and clipped the port. Typical failure sadly.

Jeremy
Click to expand...


IMO - Similar but different. The first pic mussleman posted shows signs of the piston melting above the top ring. I don't see that in your Panther piston pics.

... and a blown crank seal wouldn't care if there are one, two or three carbs but agreed that your pics don't show signs of lean or deto (although the wash looks ragged edged).

Anyhow, thats what I see but I've had to resort to using reading glasses lately.
 
musselman said:
I used yamaha oem pistons, I forgot to check the ring locator pin though, I should check that just to see.
Click to expand...

Check to see if the pin is pushed in.
 
Well after 350 km's of riding everything is working great. The new piston has the whole intake side washed with about 1.5" diameter black carbon in the middle. The other 2 are still black at the edges but very wet looking, don't know if the carbon will wash off once it's there already.
 
Just thought I would add what gas station I got the bad gas from. It was the petro canada station in bearverton, filled up with 91 in the sleds and my buddy put 94 in his denali. My srx felt very lean, high idle and went like stink, dcs light, the denali got crap gas mileage with that tank, even worse than 87 octane. Something was out of wack with that station, don't know if it's better now doesn't matter to me though because I won't be back.
 
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