ruff_rida69 Posted January 10, 2004 Report Share Posted January 10, 2004 well i took my carb and reeds off and looked in at the left piston well i saw some deep cuts in it, so i got i started freakin out well i took off my head and my left piston and my left dome had very very bad pitting, and i just rebuilt it about a month ago and it's got maybe 3 to 4 hours on it and i can't figure out how or why it would do this, i just put on a motofast pipe and a trinity c.v 33mm carb system this week and it hasn't been run it a month, i started it last thursday for the first time and its run like total crap since, i tried everything and just like 30mins ago is when i took my head off and found that, can anyone tell me why,how, or what i will need to correct this? when i rebuilt it it didn't have a scratch on the head or piston, and i run 93 octane always and my head is completly stock, Thanks, Jonathan Quote Link to comment Share on other sites More sharing options...
sandbuzzard Posted January 10, 2004 Report Share Posted January 10, 2004 I would drain the case oil, look for debris. My little bro's blaster did the same thing. It ended up being the start of a lower end bearing going. Some how the little pieces of bearing (copper) were passing by the rings. Causing the piston dome & head to pit. We caught it early but the damage was already done to the cylinder wall. Hope this helps.. Quote Link to comment Share on other sites More sharing options...
BenBB Posted January 10, 2004 Report Share Posted January 10, 2004 The case oil is separate from the crank & pistons, sandbuzzard was it maybe a transmission bearing? Even if the crank seal on the clutch side went out, it would be hard to get debris from the tranny into the crank/cylinders... Ruff rida, was the motor broken in after the rebuild? What do the pistons look like? Scratches on the intake side, broken rings, etc.? How about the crank, especially the rod bearings? Quote Link to comment Share on other sites More sharing options...
Leadfoot350 Posted January 10, 2004 Report Share Posted January 10, 2004 I have had this same thing with the 2-1 carb set up. Actually 3 times now. You will have to build a leak down tester and check for air leaks. Quote Link to comment Share on other sites More sharing options...
ruff_rida69 Posted January 10, 2004 Author Report Share Posted January 10, 2004 Benbb, yes i broke the motor in properly, but i haven't took the cylinders off yet I just saw the scratch's on the piston through the intake and i felt then and they were deep, the top of the left piston is very pitted like the left dome but the right piston an done look fine, and i can twist the piston alittle I'll take the cylinders off in alittle while and let you know what i find out. Thanks Jonathan Quote Link to comment Share on other sites More sharing options...
ruff_rida69 Posted January 10, 2004 Author Report Share Posted January 10, 2004 ok, i just went and took off my left cylinder, well both of my rings are in the right place, and theres no other scratch's on the piston, the rod moves side to side but not up and down, i just don't under stand it when i parked it a month ago it run super A+ and then when i stated it thursday when that pipe and carb and reeds it run like total crap, anyone know what it would do this? and wonder how my head and crown om my left piston got so pitted? any answer would be very helpfull, Thanks Jonathan Quote Link to comment Share on other sites More sharing options...
Holyman Posted January 10, 2004 Report Share Posted January 10, 2004 Are all the screws in the reeds? Are the reeds undamaged? Quote Link to comment Share on other sites More sharing options...
ruff_rida69 Posted January 10, 2004 Author Report Share Posted January 10, 2004 yes all the screws are still in the reeds and the reeds are fine no chips or any thing i did fine some small pieces of metel in the tips though. Quote Link to comment Share on other sites More sharing options...
yamaha350 Posted January 10, 2004 Report Share Posted January 10, 2004 check your rod bearing. one of the bearings might have come out. happend to a friend of mine a few times before he noticed it. Quote Link to comment Share on other sites More sharing options...
ruff_rida69 Posted January 11, 2004 Author Report Share Posted January 11, 2004 nope both rod bearing are still there, and there still good. Quote Link to comment Share on other sites More sharing options...
sandbuzzard Posted January 11, 2004 Report Share Posted January 11, 2004 The case oil is separate from the crank & pistons, sandbuzzard was it maybe a transmission bearing? Even if the crank seal on the clutch side went out, it would be hard to get debris from the tranny into the crank/cylinders... Ruff rida, was the motor broken in after the rebuild? What do the pistons look like? Scratches on the intake side, broken rings, etc.? How about the crank, especially the rod bearings? I don't know exactly which bearing it was. The shop we took the motor to told us it was a lower end bearing. That the pits in the head and the piston dome was from debris that came from the lower end and getting past the rings. It even put an hair line crack on the intake side of the cylinders. The case oil when drained was full of copper shreds. Any-who, i am kinda new at all this so i didn't argue. Just got out the old check book and spent some money i didn't have. Just thought i would give ol' ruff my .02. Quote Link to comment Share on other sites More sharing options...
BansheeEaterKXF Posted January 12, 2004 Report Share Posted January 12, 2004 ok look at your lower rod bearing carefuly take a small screwdriver an in the slot move those bearings around i think you will be surprized an if they dont move look to see the circlips their on the piston Quote Link to comment Share on other sites More sharing options...
grounded Posted January 12, 2004 Report Share Posted January 12, 2004 Sand / dirt through the intake................................. .................. Quote Link to comment Share on other sites More sharing options...
ruff_rida69 Posted January 12, 2004 Author Report Share Posted January 12, 2004 well BansheeEaterKXF i did what you said and both of the lower rod bearings move and all of my circlips are there, I think i might of just got some little metal pieces in it when i grinded some brackets off my airbox to make the new trinity carb fit, but i dunno, me and a buddy of mine are gonna open up the bottom end to make sure that nothing got down there and to clean it out real good, I'll let ya'll know if I find anything that could of did it, Thanks for all the help, Jonathan Quote Link to comment Share on other sites More sharing options...
Nighty Posted January 12, 2004 Report Share Posted January 12, 2004 You said you havent run the banshee for a month. Would it be possible that water has build up in the left side of your engine? Due to wheater conditions? Quote Link to comment Share on other sites More sharing options...
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