Wiseco Piston Kit

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Wiseco Piston Kit
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Wiseco Piston Kit

Our Price: $69.00$189.00

MSRP: $88.00 - $222.00 - You save up to $33.00 (15% off)

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Details

  • Lightweight forging for instant throttle response and maximum torque .
  • Computer engineered piston skirt profiles provide minimal cylinder wall friction .
  • Piston kit includes piston, rings, wristpin and circlips.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Wiseco Piston Kit Reviews

Each review submitted enters you into a
$100 gift card monthly drawing and a
$500 gift card quarterly drawing!
 
4.8 / 5.0
448 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
391
45
6
4
2
Value
4.8 / 5
Durability
4.8 / 5
Fitment
4.9 / 5
Performance
4.9 / 5
Recommend it?
Yes (157)
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Clips
Needs OEM C-clips, it would make it easier to get on & off.

-m-2006 YAMAHA WR450F--
October 1, 2018
Weldon, CA, US
Age: 45-64
Purchased
1 month ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Wiseco Piston
The piston was sent out and received in a short time period and is working amazing! All the parts were included and also in perfect shape!

-m-2008 HONDA TRX 250EX--
September 19, 2018
Westville , IN, US
Age: 15-24
Purchased
1 month ago
Gender:
Male
Weight:
131 - 160 lbs.
Height:
5'4 - 5'6
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Best of the best
Best piston on the market. Don't waste your time with other brands. Go with wiseco and you won't regret it
User submitted image
Added Sep 13, 2018
September 14, 2018
York , SC, US
Age: 25-44
Purchased
1 year ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'4 - 5'6
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Very good
Has held up to 69 hours at the track so far.

-m-2003 HONDA CR250R--
August 24, 2018
Mira Loma, CA, US
Age: 15-24
Purchased
6 months ago
Gender:
Male
Weight:
131 - 160 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Forged piston
I've had a couple of cast pistons break apart and come out the bottom of engine cases. Hopefully this forged piston will last longer and save me from replacing some cases.
August 23, 2018
Dallas, TX, US
Age: 25-44
Purchased
4 months ago
Gender:
Male
Value
3 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Doesn't Come w/Wrist Pin Bearing
I've always been a fan of Wiseco 2 stroke pistons. I was due for one, so I ordered it to install in my 2017 Husqvarna TX300. For the first time in my life, I received a piston kit that didn't come with a wrist pin bearing. If you order one of these, make sure you buy the wrist pin bearing separate. Outside of that, great piston.

-m-2017 HUSQVARNA TX 300--
August 18, 2018
Albuquerque, NM, US
Age: 25-44
Gender:
Male
Weight:
191 - 220 lbs.
Height:
5'10 - 6'0
Value
4 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Good fit
Bought this for my KX250F. Went togethor pretty well, had to file the ring gap a little but wasn't bad. Have 30 hrs so far
August 16, 2018
Pekin, IL, US
Purchased
1 year ago
Value
4 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Get the job done
Quality is great. The piston came in a fabric bag inside the box to protect it. I used this to replace the factory vertex piston on my KTM. I will say this is a single ring and definitely a little lighter piston. Bike does vibrate slightly more not sure if it revea up any quicker like they say the single ring does. But overall great quality
August 13, 2018
Madison, WI, US
Purchased
1 year ago
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
First top end, smooth as butter
First time doing a top end. Watched the videos on youtube from RMATV/MC and went off without a hitch. Kit came with a new wristpin, but no crank bearing. Bought an extra wristpin because I wasn't sure. Used the tusk top end kit with it.
July 16, 2018
Denver, CO, US
Purchased
3 months ago
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
WISECO PISTON KIT
FIRST 4 STOKE TOP END I'VE DONE. PISTON/RINGS FIT PERFECT. RUNS GREAT. WOULD RECOMMEND. QUALITY PARTS.
2005 RMZ 450

-m-2005 SUZUKI RMZ450--
July 7, 2018
HERMISTON, OR, US
Age: 45-64
Purchased
4 months ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'10 - 6'0
Each question or answer submitted enters you into a:
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$500 gift card quarterly drawing!
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 51 questions Browse 51 questions and 116 answers
Does this kit include all the gaskets needed as well as the piston?
Brandon P on Mar 26, 2017
BEST ANSWER: Just piston, rings and circlips. You will need to buy a separate gasket kit. I would recommend ordering and replacing the wrist pin also while it's tore down.
why doesn't the top of this piston have the 4 circles?
Rudy P on Sep 13, 2017
BEST ANSWER: Rudy,
It is just Weisco's design. Other manufacturers try different things to make their product different or better. It's a great piston. Weisco teflon Coates their pistons for extra protection. I have never had one not make it to the next overhaul.
Can this be used in an AMA stock class race?
A shopper on May 7, 2018
BEST ANSWER: Yes as long as you don’t change the displacement or stroke of engine you are in compliance.
My Piston only has one clip , and this one has two clips, is there any difference between one clip and two clips?
Sebastian C on Apr 4, 2018
BEST ANSWER: Your piston should have a clip on both sides just like the piston you will receive. There is a little groove on each side of the piston and you have to remove one clip to get the wrist pin off of the rod. I always put one in the piston before I put the piston back on the rod so I only have to put one clip back in once the piston
is in the machine.
Does this kit also come with the piston pin bearing?
A shopper on Dec 4, 2017
BEST ANSWER: No, it doesn't. The Pro-X bearing is Japanese made, good price. I always use them.
So it doesn’t come with a wristpin? It says its included in the details
Tyler B on Jun 19, 2018
BEST ANSWER: Yes..Wiseco piston kits include wrist pin, wrist pin clips and ring set.
just to make sure I'm getting the right piston for my cylinder , when the description states "standard " (xx.xmm) does that mean the piston is that size or thats the piston for that bore? i caliperd my bore and its 66.4mm
Michael G on Jan 19, 2018
BEST ANSWER: It means it is for that bore or it is a standard size cylinder hasn’t been touched it is stock
If you have re sleeved the cylinder with a steel sleeve will the rings work?
SAMUEL M on Dec 24, 2017
BEST ANSWER: I apologize, I don’t have an answer to that. I assume so as long as the bore is correct.
ordering it for my 16 rmz 250 is this the high compression piston ?
chris t on Jun 2, 2018
BEST ANSWER: The one I ordered was the wiseco but it was for my son's cr85 which was the high compression..if this is the same but different size I would assume it is high compression.
How often should i replace a piston?
A shopper on Apr 5, 2018
BEST ANSWER: it really depends on how the bike is being used; small bore with a fast kid racing 8hrs +/-, 250 race mode 25hrs,250 old slow guy 50-100hrs.
If the piston in my cr125 was 53.94mm and i'm putting in a wiseco 54mm, will it still work in the cylinder?
James L on Feb 26, 2018
BEST ANSWER: Where did you're measurement come from?53.94m.and yes it would b .06 mm different which is super close run it
89 YZ 250 - Bought new Wiseco piston - Prolite .020 (68.5MM), for 1989 YZ250WR. Bike has original bore (68mm - cast iron sleeve) - no score marks. Ring end gap was excessive on old rings, but no blow by on stock piston. Had 170 compression. Bike was getting hard to start. Was told to bore to next size up so that is why bought this piston. Took to machine shop today with new piston. Also brought cylinder head with me and they said that they do not need the cylinder head? I thought that the inside radius of the cylinder head needed to be opened up to accommodate the new piston/bore size? Also asked if they would champher/round edges on all ports inside cylinder after bore? They said no need to? Also wondering if power valve will need to be shaved? Anyone have any answers? Any suggestions?
Brian W on Jan 2, 2018
BEST ANSWER: Your machine shop is correct, the piston does not protrud the top of the cylinder. Also correct on rounding the edges, no need to. As far as the power valve goes I would check on reassembly.
will this fit a 2001 cr80? stock bore
james b on Sep 14, 2017
BEST ANSWER: Yes, the standard 47mm pro-lite piston is meant as a stock bore replacement with unmatched reliability from wiseco's race proven pistons
I have a 89 yz 80 the cylinder is 49mm what size piston will fit. The 48.5mm or no?
Chris T on Sep 5, 2017
BEST ANSWER: As long as its a standard bore and hasnt been altered by replating or sleeving the piston that wiseco reccomends will be the correct size.
I have a 2016 yz250 x

I want to rebuild top end over the winter. I want to go bigger.

Where do I see a chart of sizes which are available so I can see how big I can go?
A shopper on Sep 5, 2017
BEST ANSWER: On a 2016 the only way to go bigger is to buy the big bore kit. You can't bore the factory cylinder without putting a sleeve in it which would cost the same as the big bore kit with a new cylinder
it's for 2 times?
A shopper on Jun 20, 2017
BEST ANSWER: That's a vague question at best. But it is the second oversize bore from the stock piston if that's what u mean
Does this piston come coated or plain? Does it come with a TiN coated ring or plain ring?
Alexander H on Jun 15, 2017
BEST ANSWER: Mine was plain got it for my 2001 kx 125.
For a 2007 Yamaha yz 125 there are 4 different piston sizes to choose from. This piston only has one size when I enter my bike. Will it work or should I order OE?
Charles B on Jun 10, 2017
BEST ANSWER: You should alway check the piston size that came out of you machine to insure proper fit although most bikes have the metric size it is easy to figure out if it is a 65mm piston and you want it .020 over then it is 65.5 or to make it 66mm then it’s .040 over std size
Will this fit my 04 trx450 bored to a 96mm.?
armando s on Apr 4, 2017
BEST ANSWER: Select the correct size of piston upon checkout. Be aware must hone cylinder before installation of this piston.
Will this work good for 08 kfx450r rebuild? Any boring needed to be done?
Michael F on Mar 14, 2017
BEST ANSWER: As long as the cylinder is standard bore and the plating is good, this piston will work great in your bike. Always do a light hone to the cylinder whenever doing a piston replacement. It helps the rings seat and wear correctly. These pistons are one of the best on the market. I hope this helps.
I have a 2006 trx450r what is the compression rating for this piston on my atv?
Tyler A on Mar 4, 2017
BEST ANSWER: As long as it's not the high compression piston, it's the same as stock which I believe is 11:1
Is the standard Raptor 250R piston stock compression or the higher 10:5-1?
Jeff P on Oct 20, 2016
BEST ANSWER: If it's standard then it's stock compression
I have a 2007 CR 250, is this piston coated? Also, is this piston a double or single ring?
DOUG B on Oct 5, 2018
BEST ANSWER: double ring and the skirt should be coated. The racers choice wiseco is a single ring and coated as well
The piston that says it fits my '05 CRF450x says it is 96mm. Should I be concerned that the service manual says that my piston should be between 95.97mm-95.98mm?
Erik A on Jul 7, 2018
BEST ANSWER: it should be fine
Is the actually bore of this piston 54mm or is it 53.xx?
Tyler B on Jun 21, 2018
BEST ANSWER: Check wiseco website for available sizes.They make a standard size and sometimes up to 3 or 4 oversized pistons.Measure bore in 4 places with Inside micrometer or telesopic gauges first and then check for available sizes.
Why are there two size options for a stock replacement? Which one is right?
Jeff H on Feb 18, 2018
BEST ANSWER: Stock positions usually have a letter on the piston indication what size piston is in the bike you will have to look up factory piston with letter indication which size you have usually in parts breakdown will have 2-3 pistons with letters indicating size hope this helps
I have the 2000 ktm mini adventure which is a reedless motor. Is ur 39mm piston have a window on intake side? The reedless motor requires a solid piston and I've bought a few wrong ones already. Thanks for info
michael l on Jun 8, 2017
BEST ANSWER: I went and checked on the piston that we have in stock and it does have a window on the intake side.
i see that KTM has a "Size I" and a "Size II". which is this?
Penn W on Oct 12, 2016
BEST ANSWER: This would be equivalent to the size II piston which is made for a rebuild/honed cylinder rather than a brand new cylinder.
Does this piston come with exhaust bridge holes pre-drilled? 2005 YZ250
Dalton M on Sep 13, 2018
BEST ANSWER: No each machine is a little different not hard to do though
What size piston do I need if I buy a stock cylinder?
A shopper on Aug 22, 2018
BEST ANSWER: The standard bore will match the stock cylinder.
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