Wiseco Top And Bottom End Kit - 2-Stroke

Wiseco Top And Bottom End Kit - 2-Stroke
Wiseco Top And Bottom End Kit - 2-Stroke

$271.99 - $652.76
19% Off - Save up to $62.98

Select your bike to see if this top and bottom end kit fits
Item #WCO000Y

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16 Reviews
4.4 out of 5 stars
5 Star   17 4 Star   1 3 Star   0 2 Star   0 1 Star   3
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All Reviews
R3Motox Verified Purchaser
Jamestown, TN 38556, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5

Excellent product.

Gottadog
Walnut Creek CA
Durability 1/5 Ease of Installation 4/5 Performance 3/5 Power 4/5 Style 3/5
Not even 16 hours on yz250 lower. Crank = Junk

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.

yz125
Sears, MI 49679, USA
Durability 3/5 Ease of Installation 5/5 Performance 3/5 Power 3/5 Style 4/5
Bad part

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.

Gottadog Verified Purchaser
Walnut Creek, CA, USA
Durability 3/5 Ease of Installation 5/5 Performance 4/5 Power 4/5 Style 3/5
So far so good

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.

Phiatt Top 250 Contributor Verified Purchaser
North Carolina
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Always used Wiesco products, and will continue too

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.

bbbb Verified Purchaser
Durability 4/5 Ease of Installation 3/5 Performance 4/5 Power 4/5 Style 4/5
Top and bottom kit

Great product quick shipping

Hammerhead Verified Purchaser
Mountain City, TN 37683, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Excellent Transaction

Unbelievably fast shipping!!! Excellent transaction!!! Will recommend company to everyone we know!!

Jake Verified Purchaser
Durability 1/5 Ease of Installation 2/5 Performance 1/5 Power 1/5 Style 1/5
Bad Idea

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.

Jab1981 Verified Purchaser
Calhoun City, MS 38916, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great parts

Great parts very easy to install will buy again iff ever happens again

Jeremy
Durability 5/5 Ease of Installation 4/5 Performance 4/5 Power 5/5 Style 5/5
Great

Good product and would consider it again. Thanks motosport.

Jeremy
Portland Oregon
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great Product

Got this kit for my sons 65 and it is badass. Also motorsport does a good job at getting it to you on time.

DaveJ Verified Purchaser
Chattanooga TN
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great Product

Contained everything I needed for rebuild.

muggs
Eucha,OK

VanDii
Santa Fe, TX.
One convenient kit!

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!
06 YZ250

ManikRider
Corvallis, OR
Wiseco setup FTW

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.

AcTim
Washington, DC
It should be a crime the way we steal!!!l

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

37 Questions
Answered:   34
Not Yet:   3
Refugee
Q: I need a complete kit for 98 yz250?
1 month 8 days ago
94yz
Q: Will this kit fit on my 1994 yz 125?
4 months 13 days ago
I have had a hard time trying to find a rebuild kit for the top and bottom end and I was wondering if this kit would fit or were i can find a kit that fits
midrider
Q: Hi, could you tell me where the wiseco cranks are produced?
4 months 20 days ago
Mike
Q: Will this kit come with a complete gasket kit and seals to rebuild the motor? 2004 yz85?
Over 5 months ago
MotoSportExpert
MotoSport Staff Expert
Over 5 months ago
A: Yes. Complete top and bottom kit. Everything listed in the description.
Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
BDoss
Q: What size piston comes with the kit for a 2005 ktm 125sx?
Over 6 months ago
I believe I need a 53.94mm piston but just want to make sure the piston is the correct size. Thanks.
MotoSportExpert
Expert MotoSport Staff
Over 6 months ago
A: 54mm is standard bore on your 2005 KTM 125SX. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Bikelife
Q: My yz125 kick start won't go down an my back wheel is locked no it won't even start ,what's wrong?
Over 7 months ago
MotoSportExpert
MotoSport Staff Expert
Over 7 months ago
A: Its hard to say exactly without inspecting it but it sounds like you have seized it up. You will need to pull the cylinder off and inspect it.
Junior
Location: Queens, NY, USA
Q: What is the stock bore for a 1995 cr125?
1 year 5 months ago
MotoSportExpert
Expert MotoSport Staff
1 year 5 months ago
A: Stock bore on the 1995 Honda CR125 is 54mm.
mggarza
Q: I need bore size for stock honda cr250 year 2000?
1 year 6 months ago
MotoSportExpert
MotoSport Staff Expert
1 year 6 months ago
A: The "Stock Bore" piston for your 2000 Honda CR250 would be 66.40MM. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Colita
Location: New York
Q: Top end?
1 year 6 months ago
I have a 2002 cr 125 top end was rebuilt before I bought it my bike dies down taking it out of first then picks back up any ideas what's the problem
MotoSportExpert
Expert MotoSport Staff
1 year 6 months ago
A: This could be a number of different possible issues. We would need more information to give an accurate answer. Was the bike doing this before the rebuild? What gearing are you running? Jetting? 2-stroke 125s are a top end motor, not much on the bottom so they are naturally going to bog down at low speed low RPMs. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
tedder410
Q: What size piston would I need for a 1999 cr125?
1 year 8 months ago
MotoSportExpert
MotoSport Staff Expert
1 year 8 months ago
A: If you have the stock bore cylinder ou would need the "stock bore" piston. 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.
Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
1-10 of 37
Fitment
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See Fitments
# Part Numbers
Crank Kit
Product Variant Manufacturer Part #
Wiseco Top And Bottom End Kit - 2-Stroke WPC119
Wiseco Top And Bottom End Kit - 2-Stroke WPC117
Wiseco Top And Bottom End Kit - 2-Stroke WPC130
Wiseco Top And Bottom End Kit - 2-Stroke WPC128B
Wiseco Top And Bottom End Kit - 2-Stroke WPC128A
Wiseco Top And Bottom End Kit - 2-Stroke WPC115
Wiseco Top And Bottom End Kit - 2-Stroke WPC101
Wiseco Top And Bottom End Kit - 2-Stroke WPC132
Wiseco Top And Bottom End Kit - 2-Stroke WPC116A
Wiseco Top And Bottom End Kit - 2-Stroke WPC116B
Wiseco Top And Bottom End Kit - 2-Stroke WPC105
Wiseco Top And Bottom End Kit - 2-Stroke WPC100
Wiseco Top And Bottom End Kit - 2-Stroke WPC123
Wiseco Top And Bottom End Kit - 2-Stroke WPC122
Wiseco Top And Bottom End Kit - 2-Stroke WPC126
Wiseco Top And Bottom End Kit - 2-Stroke WPC134
Wiseco Top And Bottom End Kit - 2-Stroke WPC127
Wiseco Top And Bottom End Kit - 2-Stroke WPC124
Wiseco Top And Bottom End Kit - 2-Stroke WPC125
Wiseco Top And Bottom End Kit - 2-Stroke WPC104
Wiseco Top And Bottom End Kit - 2-Stroke WPC153
Wiseco Top And Bottom End Kit - 2-Stroke WPC135
Wiseco Top And Bottom End Kit - 2-Stroke WPC121
Gasket Kit
Product Variant Manufacturer Part #
Wiseco Top And Bottom End Kit - 2-Stroke C7386
Wiseco Top And Bottom End Kit - 2-Stroke C7392
Wiseco Top And Bottom End Kit - 2-Stroke C7031
Wiseco Top And Bottom End Kit - 2-Stroke C7764
Wiseco Top And Bottom End Kit - 2-Stroke C7501
Wiseco Top And Bottom End Kit - 2-Stroke C7861
Wiseco Top And Bottom End Kit - 2-Stroke C7268
Wiseco Top And Bottom End Kit - 2-Stroke C7269
Wiseco Top And Bottom End Kit - 2-Stroke C7126
Wiseco Top And Bottom End Kit - 2-Stroke C7100
Wiseco Top And Bottom End Kit - 2-Stroke C7682
Wiseco Top And Bottom End Kit - 2-Stroke C7135
Wiseco Top And Bottom End Kit - 2-Stroke C7391
Wiseco Top And Bottom End Kit - 2-Stroke C7003
Wiseco Top And Bottom End Kit - 2-Stroke C7456
Wiseco Top And Bottom End Kit - 2-Stroke C7116
Wiseco Top And Bottom End Kit - 2-Stroke C7010
Wiseco Top And Bottom End Kit - 2-Stroke C7191
Wiseco Top And Bottom End Kit - 2-Stroke C7394
Wiseco Top And Bottom End Kit - 2-Stroke C7115
Wiseco Top And Bottom End Kit - 2-Stroke C7181
Wiseco Top And Bottom End Kit - 2-Stroke C7757
Wiseco Top And Bottom End Kit - 2-Stroke C7678
Wiseco Top And Bottom End Kit - 2-Stroke C7093-EST
Wiseco Top And Bottom End Kit - 2-Stroke C7094
Wiseco Top And Bottom End Kit - 2-Stroke C3211
Wiseco Top And Bottom End Kit - 2-Stroke C7851
Wiseco Top And Bottom End Kit - 2-Stroke C7137
Wiseco Top And Bottom End Kit - 2-Stroke C7507
Wiseco Top And Bottom End Kit - 2-Stroke C7855
Wiseco Top And Bottom End Kit - 2-Stroke C7399
Wiseco Top And Bottom End Kit - 2-Stroke C7936
Wiseco Top And Bottom End Kit - 2-Stroke C7853
Wiseco Top And Bottom End Kit - 2-Stroke C7349
Wiseco Top And Bottom End Kit - 2-Stroke C7154
Wiseco Top And Bottom End Kit - 2-Stroke C7155
Wiseco Top And Bottom End Kit - 2-Stroke C7778
Wiseco Top And Bottom End Kit - 2-Stroke C7508
Wiseco Top And Bottom End Kit - 2-Stroke C7760
Wiseco Top And Bottom End Kit - 2-Stroke C7859
Piston
Product Variant Manufacturer Part #
.045" Oversize 617M06750
Stock Bore 726M05400
.020" Oversize 595M05450
.040" Oversize 702M06750
Stock Bore 835M05400
.080" Oversize 702M06850
.020" Oversize 562M06650
.080" Oversize 752M04650
.044" Oversize 614M06750
.040" Oversize 754M05500
.020" Oversize 651M05300
.080" Oversize 754M05600
Stock Bore 797M05400
.080" Oversize 801M06850
Stock Bore 646M04700
.080" Oversize 805M04950
.060" Oversize 562M06750
.080" Oversize 833M04950
Stock Bore 595M05400
.080" Oversize 643M04900
.085" Oversize 614M06850
.020" Oversize 646M04750
.020" Oversize 643M04750
.080" Oversize 573M06800
.040" Oversize 644M04900
.090" Oversize 573M06825
.080" Oversize 646M04900
Stock Bore 676M05400
Stock Bore 562M06600
Stock Bore 841M05400
.080" Oversize 797M05600
Stock Bore 614M06640
Stock Bore 804M06640
Stock Bore 801M06640
Stock Bore 805M04750
Stock Bore 702M06640
.040" Oversize 562M06700
Stock Bore 643M04700
.080" Oversize 562M06800
Stock Bore 833M04750
.040" Oversize 595M05500
Stock Bore 651M05250
.024" Oversize 614M06700
Stock Bore 799M06640
.065" Oversize 614M06800
Stock Bore 617M06640
.025" Oversize 617M06700
Stock Bore 648M04300
.085" Oversize 617M06850
Stock Bore 752M04450
.040" Oversize 643M04800
Stock Bore 644M04800
.020" Oversize 644M04850
Stock Bore 782M04850
.080" Oversize 644M05000
Stock Bore 754M05400
.040" Oversize 646M04800
.040" Oversize 648M04400
.020" Oversize 648M04350
.020" Oversize 676M05450
.080" Oversize 648M04500
.080" Oversize 676M05600
.080" Oversize 651M05450
Stock Bore 786M05400
.040" Oversize 676M05500
.030" Oversize N/A
.020" Oversize 702M06700
Stock Bore 573M06600
.060" Oversize 702M06800
.010" Oversize 573M06625
.080" Oversize 726M05600
.020" Oversize 573M06650
.020" Oversize 754M05450
.030" Oversize 573M06675
.060" Oversize 754M05550
.040" Oversize 573M06700
.080" Oversize 782M05050
.050" Oversize 573M06725
.080" Oversize 804M06850
.060" Oversize 573M06750
.120" Oversize 833M05050
.070" Oversize 573M06775
.080" Oversize 835M05600
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