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Discussion Starter #1
Can an improper throttle cutaway cause a lean enough condition to cause a burndown at part throttle? I was out this weekend, and stuck a piston just cruising down the trail at like 25 or 30 mph. Everything else is set right, its getting oil, mains were 560's since it was like -30f. Plugs looked good, although the affected cylinder was a bit darker than the other, but not too bad. I tore my carbs apart tonight, and found that i have 2.0 cutaways in there where SLP recommends 1.5's. Here's the specs on the sled.

2001 Pro-X 440/700ves
slp head
slp twins
slp airbox
v-force reeds

560 mains, 45 pilots, needle in the middle (position 3)
 

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Yes incorrect cutaway can cause piston seizure especially when running in mid range.
 

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You said you fattened your mains but did you raise your needle or go to bigger pilots too? If not that could have also caused a part throttle lean condition in that temp.
 

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Discussion Starter #4
I followed the SLP guidlines which said to leave the pilots and the needles in their stock positions.
 
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