Piston differences

juanseb · Post by **juanseb** » 28 Feb 2015, 16:56

I have just bought and received a piston that was some as being nos genuine Honda.

It's arrived in the original box with the correct part number but it a number of differences to the piston that head been removed from my ar.

There are quite a few differences in the casting but what really stands out is that this piston has a cut out / window of the inlet side skirt.

I don't believe this piston is an original ar piston can anyone confirm?

juanseb · Post by **juanseb** » 28 Feb 2015, 17:04

Apologies for the poor quality.

Post by **knackeredMk1** » 28 Feb 2015, 17:12

That is a TRX250 piston. All original CRM pistons have solid skirts.

juanseb · Post by **juanseb** » 28 Feb 2015, 17:21

Thanks for the confirmation

Post by **helisupp** » 28 Feb 2015, 19:18

It may have been a waste of money, your original piston seemed fine, just like my spare one, just put it back in.......................

Post by **helisupp** » 28 Feb 2015, 21:14

Hey, its not just you that may have purchased something other than what you wanted.

Yesterday I saw a nice T shirt on the internet that I liked, so I clicked on it and ordered 4, then I changed my mind and went back a page and ordered only 1 as I was not sure about the shape.

How surprised was I when I looked closely after clicking "Pay now" on paypal................I have ordered and paid for 14 (fourteen) T shirts, wife is bloody mad at me.

Post by **fallenmikethebike** » 28 Feb 2015, 22:45

helisupp wrote:Hey, its not just you that may have purchased something other than what you wanted.

Yesterday I saw a nice T shirt on the internet that I liked, so I clicked on it and ordered 4, then I changed my mind and went back a page and ordered only 1 as I was not sure about the shape.

How surprised was I when I looked closely after clicking "Pay now" on paypal................I have ordered and paid for 14 (fourteen) T shirts, wife is bloody mad at me.

Tell her to look on the bright side, it could have been 41

Mike

juanseb · Post by **juanseb** » 01 Mar 2015, 20:46

helisupp wrote:It may have been a waste of money, your original piston seemed fine, just like my spare one, just put it back in.......................

I was just covering all bases, I will most likely be using my original but this piston popped up on ebay and I couldn't say no for £85.

Seems it was a bargain and had no picture for a reason, not to worry i am going through the ebay process sort things out.

I have another 2 original nos pistons on their way to me from overseas, I didn't necessarily need them but I was able to pick them up for reasonable money and well I don't see Honda producing another batch.

Post by **knackeredMk1** » 01 Mar 2015, 20:53

FYI TRX pistons are not made in the exact size of the AR bore.

juanseb · Post by **juanseb** » 01 Mar 2015, 20:58

66.5mm aren't they?

Post by **knackeredMk1** » 01 Mar 2015, 21:56

No the AR is 66.4mm - See FAQs. You can of course reline them to 66.5 - this is quite common if the bore is marked as you have much better access to appropriate sized pistons.

juanseb · Post by **juanseb** » 01 Mar 2015, 22:55

I meant the closest trx piston is 66.5mm, ar is 66.4 with a, b & c kits.

Post by **gregorious77** » 05 Mar 2015, 20:58

want to sell one of your 2 spares to match my spare barrel?

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