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Discussion Starter #1
I had trouble with my machine smoking so I thought I would finally do the top end properly so I didn't have to fog myself while using the ATV (although it was great to keep away those pesky skeeters). Anyway I just heard back from the machine shop and it looks like I'll need a 0.020 overbore due to some scoring (likely why the original piston was replaced). When I took the machine apart I had found the previous owner had put in a Namura piston which seems to still be in good shape but it's too small so considering the scoring found on the cylinder walls (machine is currently still stock bore). I want this thing to be rock solid reliable when I'm done (no heavy mods to speak of) so I need the guru's help on which piston should I use.

OEM Honda?

Wiseco?

Namura?

Other?

Again reliability is my key focus so let me know what you guys think would work best.
 

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Discussion Starter #3
OEM Honda or Shindy. Stick with Japanese parts on Japanese bikes.
That was pretty much the plan from what I read.

Have anyone had issues running Shindy pistons at all? Are they literally identical to stock?
 

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I run namura. but !!!!!!!!!!!!!!!!..NO PISTON IS GOING TO LAST UNLESS YOUR CONENCTING ROD IS BAD ???!!!!!!!!!!!!!!!.
 

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I have a members '98 trx450es in my shop right now, machine shop rebuilt the engine awhile back, all new top end, and now its broken down because the dummies DID NOT FIX THE CRANK !!. a bad connecting rod will ruin a motor faster than you can whistle dixie !!!.
 

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Discussion Starter #6
I have a members '98 trx450es in my shop right now, machine shop rebuilt the engine awhile back, all new top end, and now its broken down because the dummies DID NOT FIX THE CRANK !!. a bad connecting rod will ruin a motor faster than you can whistle dixie !!!.

Good suggestion. I checked that to make sure all was good before going to the machine shop. It seemed like the current crank/rod setup is in good shape (I couldn't feel play in either rod end). I know the prior owner just pulled out the old piston and threw in a Namura STD bore but I don't think it ever sealed well due to the mild scoring on the cylinder walls. The engine seemed to run very well other than the smoking issue prior to tear down.
 

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I have a members '98 trx450es in my shop right now, machine shop rebuilt the engine awhile back, all new top end, and now its broken down because the dummies DID NOT FIX THE CRANK !!. a bad connecting rod will ruin a motor faster than you can whistle dixie !!!.

Good suggestion. I checked that to make sure all was good before going to the machine shop. It seemed like the current crank/rod setup is in good shape (I couldn't feel play in either rod end). I know the prior owner just pulled out the old piston and threw in a Namura STD bore but I don't think it ever sealed well due to the mild scoring on the cylinder walls. The engine seemed to run very well other than the smoking issue prior to tear down.
tossing in a new piston does not always work, even if the rod is good ?!. if the cylinder is out of round ?, then it has to be bored up/over the next size so the larger piston will '' seat '' better in the bore.
 
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