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Piston choice.

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So I'm gonna be replacing my piston soon and wanted your guys feedback on this.

Cosworth

Or Je

Or oem

I know the trx piston will use less oil but I'm not real concerned with a bit of oil loss.

Help me make a choice.

Edited by StonedInNy

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Yea I'm sorta leaning towards oem. I have a trip next weekend so the tear down will begin after I get back.

Those cosworth pistons with the coating on the skirts makes me wonder if they work better than oem. I remember my trx pistons always having skirt wear and was thinking that would help.

Edited by StonedInNy

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We use OEM in everyday engines and JE in the race engines.

We were involved with testing the Cosworths back in the day. They make sick power, but will burn a dipstick of oil in less than 80 miles. They are designed for 20 minute motos, not for all day riding.

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I have the TRX piston. No, zero, nada oil use between changes. I change it every 25 hours/600 miles of hard riding.

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Thanks guys. I'll be getting a OEM. When I do the switch I'll report the specs on a 150 hour old piston.

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Just dropped a JE in and very impressed with the quality. It is a TRX piston and the weight was only slightly heavier than the the OEM CRFX.

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Went down to my local honda dealer today to Order up my parts.

Piston

Rings

Pin

2 clips

Gasket kit A

And new cam chain $202. Didn't think that was a bad price for all that

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Went down to my local honda dealer today to Order up my parts.

Piston

Rings

Pin

2 clips

Gasket kit A

And new cam chain $202. Didn't think that was a bad price for all that

 

And to think,  the 2 stroke fanatics say 4 strokes are money pits   ---- I would have done a top end on my YZ 250's 5 times in 150 hours a few years back

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None. CP piston, and give your self a bit more power with a little more compression. 

 

I have heard good things about CP too, they are also part of the Carrillo (rods) family of products

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So after $202 dollars in parts and 20 hours of my time (scrubbing parts and bolts) I finished my piston and cam chain install.

The piston after 150 hard hours not race hours but I'm not shy of the limiter. Measured 95.9 , just out of spec. The install was easy but not as easy as my trx top end was. And all the dam aftermarket stuff I have installed was in the way. And had to be moved or uninstalled Lol

Took it on a few break in rides totaling about 100 miles. It's running great and I think I'm ready to switch to the synthetic oil I use normally.

You guys think I should wait a bit on the synthetic or do ya think it's done seating the rings.

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Thanks Doc I was thinking the same thing. I had a few friends tell me to wait more

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