Wiseco Piston Kit

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Displaying parts for your 1995 KAWASAKI KX100

Wiseco Piston Kit
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Wiseco Piston Kit Pro-Lite Standard (52.5 mm)

Fits: 1995 KAWASAKI KX100
Part# 1038400047

Our Price: $64.07

MSRP: $102.00 - You save $37.93 (37% off)

Get $1.28 in Quick Cash

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5+ In-Stock

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Additional Videos

How To - Rebuild A Two Stroke Top End

How to - check piston ring end gap

How to - Four-Stroke Top End Rebuild (Part 2)

How to - rebuild the top end on a motorcycle or atv (Part 2)

How To - Hone A Cylinder

How to - rebuild the top end on a motorcycle or atv (Part 1)

RM YouTube Channel

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.

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
434 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
380
42
6
4
2
Value
4.8 / 5
Durability
4.8 / 5
Fitment
4.9 / 5
Performance
4.9 / 5
Recommend it?
Yes (143)
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Trusted
Wiseco has always been my go-to for top end. Glad to see they still make it for my restoration project 1992 KX250.

-m-1992 KAWASAKI KX250--
April 30, 2018
Hudson Oaks, TX, US
Age: 25-44
Purchased
1 month ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Great choice, and the Durabilty is always great. and the price is hard to beat!
This piston was the perfect find to help perk my YZ400f up! Definitely a great price, and the shipping was quick!

-m-1998 YAMAHA YZ400F--
April 28, 2018
80104, CO, US
Age: 15-24
Purchased
1 month ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Hard to go wrong with what's been so good.
I have had good luck with wiseco I in my smokers. This keeps on working.
April 26, 2018
Los lunas, NM, US
Purchased
1 year ago
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
bang, bang!
the combustion this creates is what powers the motor. This is a great option!
April 10, 2018
Gainesville, GA, US
Purchased
2 months ago
Value
4 / 5
Durability
4 / 5
Fitment
5 / 5
Performance
4 / 5
Recommend it?
Yes
-m-2005 HONDA TRX 400EX-- got it delivered in just a few days went in like it was supposed to. Everything went well.
April 3, 2018
46526 Goshen, IN, US
Age: 45-64
Purchased
2 months ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Piston
Great product I have used wiseco for years in a lot of bike an never had a problem
March 24, 2018
Weeksbury, KY, US
Age: 25-44
Purchased
2 months ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Fitment
5 / 5
Recommend it?
Yes
great product
Ive used wiseco before and have had great results, fit and finish are great, nce breakin is done ill let you know on durability, but anticipate success.

-m-2003 KAWASAKI KX500--
March 21, 2018
Lake tapps, WA, US
Age: 25-44
Purchased
2 months ago
Gender:
Male
Weight:
221 - 250 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Durability
3 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Be careful
Great product, but be very careful, with break in procedure and if your riding in cold weather be sure to let the bike warm up to operating temps before ripping it around due expansion differences between cast and forged aluminum, broke a chunk off the crown of the piston, luckily it got kicked out the exhaust port!

-m-2002 SUZUKI RM250--
March 18, 2018
South Jordan , UT, US
Age: 15-24
Gender:
Male
Weight:
131 - 160 lbs.
Height:
5'7 - 5'9
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
I have bought hundreds of wiesco kits in the past, always top quality parts and good price.
First one arrived without a wrist pin, so I called Rocky Mountain customer service. They got shots of wiesco immediately and sent me a whole other kit, wrist pin included this time. Got it the next day.

-m-2000 HONDA CR250R--
March 15, 2018
Newburgh, IN, US
Purchased
2 months ago
Gender:
Male
Value
4 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Top of the line!
Ive always used Wiseco and always will. Never had a single issue with a forged piston. Much stronger than cast and hold up to the abuse. My only complaint was this didnt come with a wrist pin bearing so you'll have to purchase that separately

-m-2011 YAMAHA YZ250--
March 14, 2018
Saint Mary , OH, US
Age: 25-44
Purchased
2 months ago
Gender:
Male
Weight:
131 - 160 lbs.
Height:
5'7 - 5'9
Each question or answer submitted enters you into a:
$100 gift card monthly drawing and a
$500 gift card quarterly drawing!
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 41 questions Browse 41 questions and 96 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.
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.
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
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
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.
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
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.
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 anybody know if I can get a 90.5 mm piston for my 2001 CR 500?
ERIK B on Feb 10, 2018
BEST ANSWER: I checked into this for you and unfortunately, we do not carry the 90.5 mm piston for your machine. However, Wiseco does have it for your machine on their website. I'm sorry for any inconvenience this may cause.
will it fit my rm 125 2 stroke?, didnt know double ring could fit in my bike
A shopper on Jan 23, 2018
BEST ANSWER: This picture is generic and doesn't necessarily represent the actual product you will receive. If your machine is listed in the drop down menu, it will fit.
What size is the piston?
Travis o on Jan 7, 2018
BEST ANSWER: To see that size of the piston you will need to enter in a machine in the drop down boxes above the product image.
Would this fit a 2001 rm 125?
A shopper on Sep 24, 2017
BEST ANSWER: Yes, this will fit. You will need to enter in your machine in the drop down boxes above the product image.
Will this fit a 2010 kx 85?
Tyler s on Aug 5, 2017
BEST ANSWER: To see if this part will fit your machine please enter the make, model, and year into our "Choose a vehicle" drop down boxes found above the product image. If your machine is not listed, we may not carry the right item for your application. If you have a 2017 year model but don't see your machine as an option, please contact a tech via Live Chat or call us at 1-800-336-5437 for assistance.
For a 2001 YZ125 does this include a wristpin? I'm aware that some kits do not have wristpin for 2 strokes
Braydon C on Jul 31, 2017
BEST ANSWER: This kit will include the wristpin but you will need to purchase the wristpin bearing separately.
What is the next bore size for a 2001 yz250 ?
A shopper on Jul 25, 2017
BEST ANSWER: I show that we only carry standard bore sizes for the 2001 YZ250. Standard is 66.35mm. The Wiseco Pro-Lite is 66.4mm.
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