What piston for 2019 kx450 top end?

Duncster316
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Duncster316
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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Jbulz
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Jbulz 11/5/2018 12:01pm
11/5/2018 12:01pm
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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Duncster316
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Duncster316 11/5/2018 3:11pm
11/5/2018 3:11pm
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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Spudnut
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Spudnut 11/5/2018 5:48pm
11/5/2018 5:48pm
Oem pistons are cast, go with a forged. My lesson cost me $2238

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Duncster316
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Duncster316 11/6/2018 3:14am
11/6/2018 3:14am
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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Lynch
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Lynch 11/6/2018 4:43am
11/6/2018 4:43am
Spudnut wrote:
Oem pistons are cast, go with a forged. My lesson cost me $2238
What makes a forged piston better?
kb228
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kb228 11/6/2018 5:52am
11/6/2018 5:52am
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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c0ncEpT
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c0ncEpT 11/6/2018 8:12am
11/6/2018 8:12am Edited Date/Time 11/6/2018 8:14am
JE/Pro circuit already has a piston for the 2019 KX450

Duncster316
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Duncster316 11/6/2018 5:01pm
11/6/2018 5:01pm
Thanks for the replies guys, fyi - today JE websight shows std and high comp pistons available for the 19 kx450 Smile
Lasse
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Lasse 11/7/2018 9:07am
11/7/2018 9:07am
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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Nystrom7
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Nystrom7 11/9/2018 7:50am
11/9/2018 7:50am
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...
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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walent215
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walent215 11/9/2018 9:01am
11/9/2018 9:01am
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...
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.
Duncster316
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Duncster316 11/10/2018 5:33pm
11/10/2018 5:33pm
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.
EHink450
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EHink450 11/15/2018 3:52pm
11/15/2018 3:52pm
c0ncEpT wrote:
JE/Pro circuit already has a piston for the 2019 KX450 View this post on Instagram Hi compression @procircuit78 piston going in the 2019 KX450 for the...
JE/Pro circuit already has a piston for the 2019 KX450

I'd like to hear how the PC piston performs if anyone here has one yet
kb228
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kb228 11/15/2018 4:52pm
11/15/2018 4:52pm
c0ncEpT wrote:
JE/Pro circuit already has a piston for the 2019 KX450 View this post on Instagram Hi compression @procircuit78 piston going in the 2019 KX450 for the...
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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