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what could cause this???

  • Thread starter Thread starter NATEO
  • Start date Start date
better check the intake boots for air leaks cracks etc. I bet you had a bad seal at carb #4 and it burned up that piston . I have seen this numerous times on older bikes and snowmobiles :shock:
 
i once ran WAY too much boost and a turbo car and it had pistons like that when i tore it open. i think you need to check your turbo pressure! haha
 
If the other 3 are normal, then it's a one-of-4 problem (obvious eh) and was most likely caused by excessive lean condition in that one cylinder. That took a lot of heat to melt that badly. You'll be into more than a light hone on that one cylinder (besides the obvious). Had you synched the carbs recently.....did this one take a considerable adjustment (may indicate carb problem or intake leak between the carb and head)......a leaking intake or exhaust valve will compound the problem as well. If the companion cylinder seems to have aluminum deposits on it's plug, indicating that it also is experiencing heating, you might also check the ignition timing for that pair.
 
Just curious, is this engine original from Suzuki, or has some boneheaded P.O. ever "rebuilt" it?
Could have had some problem like improper cylinder clearance, rings too tight, or some other issue.
But most likely I would go with the way too lean concept.
 
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