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02-15-2013, 07:35 PM
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#1 (permalink) |
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300EX Rider
Join Date: Jan 2005
Posts: 951
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What would've caused this???
What do need to check out...see below pic
Engine is/was a 480cc 11.5:1 w/ +3mm crank and a hc3 cam Now the weird...it's only this bad on the exhaust side of cylinder and and the piston shows no wear to the eye. Glad I was bored waiting for parts and decided to tear into it. 
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Back on a Honda !!! Thanks to my sponsors: Gt Thunder Thede photography AXO Gopro Dwt Outlaw racing Hotcams Hotrods Pivot works Cylinder works Vertex pistons |
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02-15-2013, 07:37 PM
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#2 (permalink) |
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300EX Rider
Join Date: Jan 2005
Posts: 951
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To me the only thing i seem so far is that the compression ring gap is HUGE!!
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Back on a Honda !!! Thanks to my sponsors: Gt Thunder Thede photography AXO Gopro Dwt Outlaw racing Hotcams Hotrods Pivot works Cylinder works Vertex pistons |
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02-15-2013, 07:41 PM
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#3 (permalink) |
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Fairly fast foreigner!
Join Date: Mar 2009
Location: Carlsbad, Ca
Posts: 3,065
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Is that grooves in the cylinder? Hard to tell from pic.. piston rock from incorrect piston to cylinder wall clearance would be my guess... and it is a guess... Did it knock when running?
The ring gap would say that might be the case too though..
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'06 TRX450ER, '03 XR400r, '05 CRF250r, '06 CBR1000RR (StreetFighter), '71 CB500, '81 Virago XV750 (the 110 Bike). 06 Black TRX450ER (Conv to kicker) "Medium" Big bore! Quikshrk (OCP), Demon, REAZ bits. Last edited by OTMTRX; 02-15-2013 at 07:43 PM. |
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02-15-2013, 07:45 PM
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#4 (permalink) |
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300EX Rider
Join Date: Jan 2005
Posts: 951
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Didn't knock actually ran pretty good...it was a holeshot monster.hard to keep front end down @ 3/4 to wot
__________________
Back on a Honda !!! Thanks to my sponsors: Gt Thunder Thede photography AXO Gopro Dwt Outlaw racing Hotcams Hotrods Pivot works Cylinder works Vertex pistons |
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02-17-2013, 12:22 PM
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#5 (permalink) |
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300EX Rider
 
Join Date: Dec 2009
Location: meadow lake SK.Canada
Posts: 666
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What does the other ring gap look like? If it was piston rock the skirts of the piston should be beat in pretty good.
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04 trx450r ss/sb 13:1 HC 1 FMF factory4.1 kibblewhite valves Deshrouded head |
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02-17-2013, 08:07 PM
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#7 (permalink) |
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450R Veteran
Join Date: Feb 2005
Location: Mapleton,Utah
Posts: 3,142
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That is caused by lack of air filter mantiance. Dirt went through the motor. If the cylinder is that bad so is the piston. Probley check the valves as well. The dirt hits the valves before it hits the cylinder.
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05 Trx450r(s) Walsh/Pep/Rath |
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02-17-2013, 08:56 PM
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#8 (permalink) | |
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250EX Rider
Join Date: Feb 2005
Location: Latrobe, PA
Posts: 227
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Quote:
Only thing that causes that is dirt. sometimes poor plating on the cylinder. On LTR450 stock cylinders you see this alot. And by the color of that oil on your head in the background ( looks dirty) I would say it was eating some dirt. when you put it back together make sure you clean your intake boot real good. It aslo would hurt to tear the bottom end down just to clean & inspect everything |
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