What would've caused this??? - Honda TRX Forums: Honda TRX 450R Forum

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Old 02-15-2013, 07:35 PM   #1 (permalink)
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Default 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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Old 02-15-2013, 07:37 PM   #2 (permalink)
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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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Old 02-15-2013, 07:41 PM   #3 (permalink)
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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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Old 02-15-2013, 07:45 PM   #4 (permalink)
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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
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Old 02-17-2013, 12:22 PM   #5 (permalink)
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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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Old 02-17-2013, 01:35 PM   #6 (permalink)
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Dirt through filter (probably K&N )!!
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Old 02-17-2013, 08:07 PM   #7 (permalink)
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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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Old 02-17-2013, 08:56 PM   #8 (permalink)
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Quote:
Originally Posted by racer69 View Post
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.


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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Old 02-18-2013, 01:36 PM   #9 (permalink)
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480cc correct? Stock replated cylinder or cylinder works? Either way, subpar plating.
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