What piston for 2019 kx450 top end?

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11/5/2018 11:58 AM

Hey, still a long way (hopefully) from my first top end, but, called CP Carrillo today and they say there is 0% progress so far on a 2019 piston. Any of you guys done a top end yet or purchased a piston or top end kit for this bike? What is the best option right now or coming soon? Thanks.

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11/5/2018 12:01 PM

I don't have plans to do a top end yet, but I'll throw an OEM one in when the time comes

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11/5/2018 12:35 PM

stick with OEM

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11/5/2018 3:11 PM

Thanks for th3 replies. So I had heard oem kawasaki pistons in the past weren’t the greatest, could be wrong about that. I did read this piston is a new design.

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11/5/2018 5:48 PM

Oem pistons are cast, go with a forged. My lesson cost me $2238

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11/6/2018 3:14 AM

That’s kind of what I was thinking Spud, thanks for the input. Probably just keep an eye on CP, JE, and Wiseco then, hopefully they will come out with something before too long.

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11/6/2018 4:43 AM

Spudnut wrote:

Oem pistons are cast, go with a forged. My lesson cost me $2238

What makes a forged piston better?

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11/6/2018 5:52 AM

Ive found that CP pistons are the best as far as quality. I havent tried JE yet, but to my knowledge theyre right there with cp. both are better than wiseco for sure. The ribbing underneath the CP is much more robust than the wisecos. Both are much better than oem and will last more hours.

Forged pistons are solid parts where their shape is pounded from a single piece of aluminum. Look up some videos on forging metal.

Cast pistons are molten aluminum poured into a sand or foam mold. Castings are very porous and arent as strong as billet or forged aluminum. Look up some videos on castings.

At the end of the day, pistons are one of those things that can be upgraded from oem to be better

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11/6/2018 8:12 AM
Edited Date/Time: 11/6/2018 8:14 AM

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Race Bike: 2018 KTM 350SXF

Other Bikes: 1985 CR80R, 1990 CR250R, 1998 PW80, Specialized Fuse Comp 29.

Sold: 2016 YZ250F, 2012 CRF250R

11/6/2018 5:01 PM

Thanks for the replies guys, fyi - today JE websight shows std and high comp pistons available for the 19 kx450 smile

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11/7/2018 9:07 AM

Cast VS Forged isn't as easy as "what is best", it depends on application and what the user wants.

Cast pistons keep their measurements better than a forged and last longer as a rule of thumb.

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11/9/2018 7:50 AM

Duncster316 wrote:

Thanks for th3 replies. So I had heard oem kawasaki pistons in the past weren’t the greatest, could be wrong about that. I did read this piston is a new design.

Ive heard this aswell but never had a Piston failure. I have been on kxf:s since 05 without any piston failure, i use oem and prox pistons and change them around 80-85 hours .

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11/9/2018 9:01 AM

Lasse wrote:

Cast VS Forged isn't as easy as "what is best", it depends on application and what the user wants.

Cast pistons keep their measurements better than a forged and last longer as a rule of thumb.

yup....I've seen cast pistons go alot of hours in a 250f so as you say it depends on application and preference.

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11/10/2018 5:33 PM

Interesting, maybe the new oem piston will end up being solid design. Being a vet, would love to just stick with that anyway. Time will tell I guess.

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11/15/2018 3:52 PM

I'd like to hear how the PC piston performs if anyone here has one yet

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11/15/2018 4:52 PM

c0ncEpT wrote:

JE/Pro circuit already has a piston for the 2019 KX450

EHink450 wrote:

I'd like to hear how the PC piston performs if anyone here has one yet

The same as any other HC piston... more power everywhere.

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