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Wiseco Pro-Lite Piston Kit - 2-Stroke

$125.97 - $262.97
$90.99 - $195.99
4.80 out of 5 stars

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Wiseco Pro-Lite Piston Kit - 2-Stroke
Wiseco Pro-Lite Piston Kit - 2-Stroke
  • Description
  • Reviews (180)
  • Q&A (137)
  • Fitment

The MotoSport.com Wiseco Pro-Lite Piston Kit - 2-Stroke includes one of each of the following components with the following attributes:

The Wiseco Piston Kit is not just a basic piston replacement, it is a performance piston kit that is more durable than O.E.M. pistons and includes everything necessary to rebuild your top end.

Wiseco Pro-Lite Piston:

Important note: This piston is for a stock sized bore. Please measure your cylinder to check clearance before ordering.

Wiseco leads the performance aftermarket by producing the highest quality forged pistons in the U.S.A. Wiseco is unique because they forge all of their own pistons in-house, and produce all of their own forge tooling in the U.S.A. This allows Wiseco to control all aspects of their manufacturing process from raw bar to skirt coating on the finished parts.

Wiseco Pro-Lite motorcycle pistons are forged using the highest quality materials available resulting in a piston that provides excellent performance and durability. The Wiseco Pro-Lite piston features a race-ready dome finish with smooth edges for improved combustion flow. The rings, wrist pin, and circlips are manufactured by Wiseco under their strict quality standards to make sure every piston kit fits correctly, ensuring top performance is achieved.

Pro-Lite Piston features:

  • Much stronger than stock.
  • Tight tolerances for quiet running.
  • More hours with peak performance between piston changes.
  • All Pro-Lite pistons include rings, wrist pin and circlips.

Extreme racing conditions demand the strength and toughness that only forged pistons can offer. Compared to cast pistons, forgings are tougher and more durable, and will stand up to the abuse that high performance motorsport applications require. Most castings are brittle, have no grain structure and tend to fail catastrophically when the material yield strength is exceeded. Forgings have condensed grain that is aligned to the features of the part, which produces higher mechanical properties, and resistance to impact and fatigue. Each forging is designed to optimize the strength-to-weight ratio, and maximize performance.

Wiseco Needle Bearing:

The Wiseco Needle Bearing is a high quality replacement wrist pin bearing designed to withstand the harsh demands of racing. Wiseco built their needle bearing to meet or exceed O.E.M. specifications.

Cometic Top End Gasket Kit:

State-of-the-art gaskets is what Cometic has been doing since its inception in 1989. This comes from their dedication to constructing gaskets for the most demanding race circuits like AMA and NASCAR. Today's lightweight engines are producing more horsepower, higher cylinder pressure, clamp load and extreme temperatures. Cometic's commitment is to provide innovative, quality gaskets while maximizing your engine's power and performance.

Cometic meets the needs of each specific gasket by using materials to match. Even the basic top end gasket kit features different materials for each gasket. The head gasket is constructed from non-asbestos, flexible graphite that is laminated to a stainless steel core. The manifold and base gaskets are constructed from non-asbestos nitride rubber-bound fiber. Cometic also includes copper gaskets where needed.

Cometic designs and builds their gaskets in the U.S.A.

Note: Image is for reference only, actual Kit may vary based on contents and fitment.

4.8 out of 5 stars (180)
4.8 out of 5 stars
5 star   159
4 star   16
3 star 0
2 star   2
1 star   3
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1-10 of 180
Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Style
Location: north carolina
Nicknackzz
GIVE YOUR 2 STROKE WHAT IT NEEDS! A WIESCO

.. Awesome piston kit with all the looks power and absolute. Awesomeness a piston puts out.. Motosport done an amazing job shipping my order and getting here by the weekend so I could rebuild the top end of my kx125 so I could get out there and brrraaaapppppp! !!!! Ooh God the first kick after the rebuild felt so good ..she started up and purred Luke a tiger humping another tiger! She puurreeddd and screammmmeedd VROOOOMMMMMM. SHE WENT AS I TWISYED THE GRIP! broke her in with a 15min idle and short ride with repeat... outstanding product and excellent service from motosport! !! Thank you!!!!!

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Omaha, NE, USA
Mine
Everything you need.

We installed this in my sons 98 CR125. First off all the parts needed are in this kit. After installation it has tons more mid-range power and is overall better running, I guess it was long overdue, He bought the bike used and we had no idea of previous maintenance but it made it run much better.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: NC
Paully
Quality parts

Never had a bad experience using Wiseco products.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Top 1000 Contributor Verified Purchaser
Location: Nj
Nicco
Solid top end

Good top end not unhappy with anything about the kit,

Overall 4 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Harlingen, TX, USA
Mike

Only issue with product is exhaust gaskets didn't fit my P.C pipe! Should have an opt available !

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Hazard, KY, USA
hoscat201
Best piston kit made

i have bought almost every brand of piston kits but this is the one that stood out the most it has lasted the longest while providing the same amount of power it almost never looses power and it is super durable i will continue running this piston kit and also recomend it to everybody i know

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Fontana, KS 66026, USA
ThomF
Great piston

Great piston. Great performance.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Austin
Cr125 rebuild

I blew my top end on my 2002 Honda cr125r on a Sunday. Took it apart and order this kit on Tuesday night with the 2-day shipping. It was scheduled to be here that friday. It came a day early! Which was awesome! The installation was super easy and fast. I had a blown top end on a sunday and by mid week I had my bike running and was able to go ride that Saturday! I couldn't be more happy! Keep up the great work guys!

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Massachusetts
pressureputt
Piston kit

Great kit. Great packaging. Cant go wrong with any purchase from MOTORSPORTS...

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Webster, MA
iguest
Installed on a "B" Cylinder (2004 YZ250)

Good quality products from Wiseco. Installed STD size Pro-Lite piston, rings & small end bearing. Came with all the gaskets I needed. Cylinder was marked as a "B" size (Printed in Ink right above the intake/reed cage) Could still see swirl marks. End gap on the rings was just within spec (on the tight side). Have two full days of riding on it now. Ran the pre-mix a bit rich for brake-in. By the feeling of my boot, there's a lot more compression. Bike will wheelie in every gear. No more tapping sound from the small-end bearing. Can't wait to get back on the bike. Age: 43, Weight 170 lbs. Last bike was a 1986 CanAm 500 ASE.

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Total Questions (137)
Questions with answers:
  137
Questions without answers:
0
Blake Location: Jonesboro
Jones Location: England
jayy Location: Westland, MI, USA
1-10 of 137
aguy 1 month 22 days ago
What size is the piston in mm?
Expert MotoSport Staff
1 month 22 days ago
MotoSportExpert
The "stock bore" piston would be 47.50MM and the "080" Oversize" would be 49.50MM for your 2005 Yamaha YZ85.
JohnHonda 1 month 24 days ago Location: Australia
Will this fit in my 2007 Honda CR125?
Ordering from Australia and my bore is measured out to be 54mm and is stock bore size will I be able to use this piston for my rebuild.
MotoSport Staff Expert
1 month 23 days ago
MotoSportExpert
This Wiseco Pro-Lite Piston Kit for the 2007 Honda CR125 would be 54mm. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct kit for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order. *Note: All products sold on Motosport.com are for US models only. We unfortunately do not have product fitment for non-us models.
Pdxmoto 2 months 6 days ago
What is the mm on the bore?
How many mm is it from stock bore- .80 over?
Expert MotoSport Staff
2 months 5 days ago
MotoSportExpert
The .80 Wiseco Pro-Lite Piston for your 2001 Honda CR250 would be + 2.00mm or 56mm bore. 762M05600
Blake 2 months 17 days ago Location: Jonesboro
Which piston should I get for my 2008 kx100.?
MotoSport Staff Expert
2 months 11 days ago
MotoSportExpert
If you are just replacing the piston, then you need to first know the bore of the cylinder. This can be done by using a bore gauge to find the diameter or by reading the owner??s manual to find the bore specifications. Ultimately, the bore should be measured for the best possible results. After the diameter is known, then you can pick which size piston will work best in your cylinder. Remember to maintain about a 0.05mm (0.002??) piston to cylinder clearance, depending on application. If you are having a cylinder re-plated, then you will want to choose a piston of the OE bore size (an A or B size is probably best). When you send the piston and cylinder away to get re-plated, the plating facility will match the cylinder bore to piston diameter. If you have a cast iron bore cylinder and you are sending the piston and cylinder off to a machinist to be bored out, then you will want a piston that is oversized from the current diameter. For example: If your current bore is 64.00mm, then you will want to choose a 64.50mm or similar oversized piston. The machinist boring the cylinder will bore and hone the cylinder to match the piston size. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Jake 2 months 20 days ago Location: Connecticut, USA
Will this fit my 54.0 x 54.5 stock bore 2007 RM 125?
Also, will i need to do anything to the completely stock untouched cylinder that's currently on there to accommodate the forged piston?
Expert MotoSport Staff
2 months 11 days ago
MotoSportExpert
If you are just replacing the piston, then you need to first know the bore of the cylinder. This can be done by using a bore gauge to find the diameter or by reading the owner??s manual to find the bore specifications. Ultimately, the bore should be measured for the best possible results. After the diameter is known, then you can pick which size piston will work best in your cylinder. Remember to maintain about a 0.05mm (0.002??) piston to cylinder clearance, depending on application. If you are having a cylinder re-plated, then you will want to choose a piston of the OE bore size (an A or B size is probably best). When you send the piston and cylinder away to get re-plated, the plating facility will match the cylinder bore to piston diameter. If you have a cast iron bore cylinder and you are sending the piston and cylinder off to a machinist to be bored out, then you will want a piston that is oversized from the current diameter. For example: If your current bore is 64.00mm, then you will want to choose a 64.50mm or similar oversized piston. The machinist boring the cylinder will bore and hone the cylinder to match the piston size. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Tasman 2 months 20 days ago Location: Broome WA 6725, Australia
My 2009 yz125 has a B sized cylinder will the weisco "stock" piston fit?
MotoSport Staff Expert
2 months 20 days ago
MotoSportExpert
Yes the stock bore Wiseco piston kit will work with your OEM stock bore B cylinder. The difference in the sizes is 0.01mm (0.0004") increments with A being the smallest. Wiseco offers just one size stock bore piston that will fit A or B cylinders.
Jones 2 months 27 days ago Location: England
Will this fit my 46.8 rm80?
Expert MotoSport Staff
2 months 26 days ago
MotoSportExpert
Stock bore for the US model 2001 Suzuki RM80 would be 47.5mm.
jayy 2 months 27 days ago Location: Westland, MI, USA
Will this fit my qaud?
This product came up for my 89yamaha blaster,will it work for a qaud?
MotoSport Staff Expert
2 months 27 days ago
MotoSportExpert
Yes Just be sure to correctly select the Year/Make/Model of your ATV and piston size before ordering so we can be sure to send you the correct kit for your ATV. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Bubba 3 months 5 days ago
Will this fit my 2000 rm250 with a 66.35mm bore?
Expert MotoSport Staff
3 months 1 day ago
MotoSportExpert
The Wiseco Stock Bore piston (756M06640) for your 2000 Suzuki RM250 would be 66.40MM. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Dukester 3 months 20 days ago
Will this kit fit my stock 1997 yz 125 ?
MotoSport Staff Expert
3 months 17 days ago
MotoSportExpert
Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct kit for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
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