Wiseco Top And Bottom End Kit - 2-Stroke
- 16 Reviews
- 31 Questions
The MotoSport.com Wiseco Top And Bottom End Kit - 2-Stroke includes one of each of the following components with the following attributes:
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 Complete Crank Kit:
Wiseco Powersports crankshafts feature a double-forged connecting rod made from dedicated forgings. The rods maintain superior strength, durability, and dimensional consistency through improved grain flow. Shot peening eliminates residual stress and oil slots are located to maximize lower rod oiling and extend bearing life. Coated bronze thrust washers have a dimpled design to increase oil retention and reduce stress between the connecting rod, washer, and crank web. Double-drilled small ends provide the piston pin with extra lubrication and cooling, reducing distortion of top end due to thermal transfer from the piston.
Wiseco has designed these crankshafts and connecting rods to work together with their pistons to provide the smoothest rotating assembly possible. Having a complete bottom end that is made of 100% forged material will give you the piece of mind that your motor will be able to withstand any abuse within reason.
Complete Crank Kit features:
- Each kit contains everything you need to complete your rebuild the right way, the first time - crankshaft and connecting rod, all applicable bearings, and complete bottom end gasket kit made to meet or exceed O.E.M.
- Wiseco connecting rods are double-forged from a dedicated forging and feature shot peening, oil slots, and coated bronze thrust washers.
- Bottom end gasket kits are made from premium materials, exceeding O.E.M. standards, to provide exceptional seal between critical mating surfaces.
- Main bearings are manufactured to the highest quality standards; each is case hardened for maximum life and smooth operation at high RPMs.
- Corrosion-resistant surface treatment to prevent corrosion and pitting over long term use or storage; this will add to the life as well the strength of the assembly.
- Top end of rod is bushed for oil retention and eliminates pin galling. The bottom end rod bores are case hardened to 58 - 62 RC to optimize bearing running surface.
- The crank pin bearings are manufactured from the highest quality, hot rolled steel case hardened to 58 - 62 RC to extend the lifetime of the assembly.
- Caged needle roller bearings to provide the highest possible RPM.
Professional racers as well as weekend riders choose these solid kits to reduce failure rates and take advantage of the horsepower and immediate torque a lightweight bottom end can deliver.
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.
I bought this upper and lower kit. Piston's from Wiesco are always decent. But the crank.. Another story. I have just under 16 hours on the motor. But since the beginning I always had problems with the crank oil seal. The crank went through 3 of them. If I didn't pull the motor and split the cases it would be needing a 4th seal. The bearing to crank tolerance is very poor on the right side. I had excessive noise recently and found the crank simply slid out of that bearing. Bearing still spins smoothly. Just that the crank and bearing tolerance is too big.
I should have bought a Hot Rods crank, and that is exactly what I just did. Motosport did offer to help with the cost substantially and I give them an A+++ rating. Wiesco only warranties their products for 30 days.
I'm a rec rider. Never race. Run 40/1 oil, always on the slightly rich side. Good thing is these two strokes are a breeze to disassemble and build.
just put in on my 2003 yz125 after about 3 tanks of gas one of the plastic spacers on the crank borke (not melted) and seized the bearings and almost trashed the cylinder. the mechanic said it could be bad plastic or built incorectly. i might try the wiesco crank again.
I have yet to run the motor but everything I bought has been within spec and the install into my yz250 was exactly as expected. I followed the procedures in the manual.
So I'll update after I have some time on the motor.
Wiesco has been around for a long time and as long as they continue with their standards to quality, they will still be around for a long time to come. The kit was excellent, all gaskets and seals were included; this is the only way to go with a total overhaul.
Great product quick shipping
Unbelievably fast shipping!!! Excellent transaction!!! Will recommend company to everyone we know!!
I put about 2 - 3 hours on this setup and the needle bearing quit on the big end of the connecting rod. I would not recommend anyone buying this kit strictly because the bottom end does not hold up.
Great parts very easy to install will buy again iff ever happens again
Good product and would consider it again. Thanks motosport.
Got this kit for my sons 65 and it is badass. Also motorsport does a good job at getting it to you on time.
Contained everything I needed for rebuild.
This came with everything we needed to get the job done. The bike runs again, and it runs fantastic! I expect the forged crank to be a bit stronger as well!
I am very pleased with the quality of this product. Everything fits together like a dream, and you can tell that the build quality is stellar.
Just make sure you order the right year...got the years mixed up, but they responded fast and shipped right order. After replacing top & bottom end, reed valve, & bigger jet in carb...you know the rest
Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Crank kit Includes crankshaft, main bearings, complete bottom end gasket set, including all seals and gaskets needed for the job.
Top End Gasket Kit includes:
1 - Head Gasket
1 - Base Gasket
1 - Intake Gasket
1 - Right Power Valve Gasket
1 - Front Power Valve Gasket
1 - Resonator Cover Gasket
1 - Power Valve Rod Gasket
1 - Water Inlet Gasket
2 - Exhaust Gasket
Piston kit includes:
piston, rings, pins and circlips
Dirt Bike / ATV: 1-888-676-8853