03' Cr250r OEM piston replacement

cityjack
Posts
193
Joined
6/9/2017
Location
Granite Falls, NC US
Evening all,

Its that time again to do the top end. Bike runs great no problems, just want to freshen it up a bit. Went to Service Honda and my OEM piston is no longer available. Pin, bearing, clips, and rings are, but no piston. Can someone please recommend a top of the line replacement for OEM, std bore. Also, why one over the other if you have experience with a couple choices.

Lastly, are OEM Honda pistons cast or forged?

Thank you all.

Sid
|
3/20/2020 7:00pm
OE pistons are cast.

I've been using and recommending the WISECO elite series piston past couple of years in my personal stuff and any engines I build. Everything they say about them seems to be true. Very advanced two stroke pistons.
H4L
Posts
2499
Joined
3/18/2016
Location
CA US
3/21/2020 2:17pm
I’ve used oem, wiseco & wossner pistons.
I stopped using cast ones in the mid 2000’s. The forged material is much better for durability & longevity. I saw a few friends / fellow riders bikes have cast pistons break apart & have catastrophic engine failures.
1
crc245
Posts
1085
Joined
10/29/2007
Location
Yorba Linda, CA US
3/21/2020 6:44pm
Closest to OEM would be a ProX cast replacement; I've had better luck with them over anything Wiseco...
Keith72
Posts
389
Joined
7/17/2010
Location
Omaha, NE US
3/22/2020 7:22am
ProX or Vertex are good choices. I've used both. In the process of putting a Vertex piston kit in my 2017 kx250f as we speak.

The Shop

Hoseclamp
Posts
635
Joined
2/2/2018
Location
OH US
Fantasy
617th
3/22/2020 7:31am
Make sure you mic your bore and your piston so you know for sure what you got. Ill just leave it at that.
1
H4L
Posts
2499
Joined
3/18/2016
Location
CA US
3/22/2020 8:34am Edited Date/Time 3/22/2020 9:09am
Hoseclamp wrote:
Make sure you mic your bore and your piston so you know for sure what you got. Ill just leave it at that.
Yes. Great advice. I’ve been using Wossner forged pistons exclusively for the last 10 yrs. or so with excellent results.
OP - Forgot to add in case you’re not familiar with forged pistons it is very crucial to properly warm up the engine (when cool) before each ride.
If not, you’re risking the engine to a potential cold seizure.
The forged material expands at a different rate vs. the cast substrate.
navyslideby
Posts
30
Joined
3/14/2020
Location
West Palm Beach, FL US
3/22/2020 5:37pm
I'm with Mr. Robinson. I use Wiseco Racer Elite pistons exclusively on all my bikes and all my rebuilds. I run my bikes pretty hard and have yet to have any type of failure with them...

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