David DeLeon Posted December 7, 2012 Report Share Posted December 7, 2012 Been running a banshee with stock carbs, This is what I have jetting 290s pilot 25. FMF Gold series pipes, boost bottle, roost boost. Stock air box, K and N Filter. Snorkle removed. No holes in the box. Been running this set up for years. Last trip out, melted down left piston. some damage to right side also. Been trying to figure out what went wrong. Carb was clean, no debries. No air boot leaks. The only thing I found was a plugged pilot jet. Can a plugged pilot cause a meltdown at high load. Running wide open in a wash? I found the jetting guide that gives a good look or idea as to what jetting I should be running. Again been running this engine for many years. Any comments would be appreciated. Any suggestions on jetting changes? Thanks David Quote Link to comment Share on other sites More sharing options...
Nightmare Posted December 7, 2012 Report Share Posted December 7, 2012 Check your intake boots around the boost bottle for cracks. Sent from my SGH-T679 using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted December 7, 2012 Report Share Posted December 7, 2012 if you where not getting a run away idle no it shouldn't of caused your melt down It could of been part of the cause it finally quit on you as it does have a bleed effect through out the range. Do a leak down test I bet you got some other issues that where the main cause. What? The pilot feeds fuel at WOT, along with the max fuel it can flow your also getting the main jet too. So if the pilot is plugged...your missing fuel on your top end jetting. That would cause a burn down for sure. Bad gas can cause it too if the motor was detonating. But....were the pilots on BOTH carbs clogged? Because your not going to burn down both pistons if only one pilot is clogged. Sounds like you have an issue that might be bigger than just a clogged jet. Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted December 8, 2012 Report Share Posted December 8, 2012 , boost bottle, roost boost Wtf is roost boost? Quote Link to comment Share on other sites More sharing options...
fappy'97 Posted December 8, 2012 Report Share Posted December 8, 2012 Post up some pics of this bike... I'd be curious to see what this roost bottle looks like. Quote Link to comment Share on other sites More sharing options...
04zSpittinKlotz Posted December 8, 2012 Report Share Posted December 8, 2012 He melted down the left piston.... my guess would be that crankseal went bad sucking in air Quote Link to comment Share on other sites More sharing options...
Paulie B Posted December 9, 2012 Report Share Posted December 9, 2012 The bike would hardly run with a pluged pilot. Why didn't you stop riding it at that point? Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted December 10, 2012 Report Share Posted December 10, 2012 Golden rule #1 leak down before tear down otherwise your guessing at maybe's Quote Link to comment Share on other sites More sharing options...
421alkybanshee Posted December 10, 2012 Report Share Posted December 10, 2012 to answer the question, yes it will help melt a piston. totally the answer no, air leak on seal my guess Quote Link to comment Share on other sites More sharing options...
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