2015-2021 Yamaha R1 13.5:1 79mm std bore x 50.9mm stroke (998cc) piston kit with UHM
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2015-2021 Yamaha R1 13.5:1 79mm std bore x 50.9mm stroke (998cc) piston kit with UHM
|
Make |
Yamaha |
|
Engine Size |
1000cc |
|
Model |
YZF-R1 |
|
Year |
2015-2021 |
|
Bore (mm) |
79mm |
|
Comp Ratio |
13.5:1 |
|
Piston Part Number |
M1131 |
|
Gasket Part Number |
Call |
|
Conrod Part Number |
PSR9049 |
|
Pin Part Number |
W669-1650-12CP1C |
|
Locks Part Number |
669x050 SWL |
|
Rings |
CPXG-7900C |
|
Shelf (RPO) or Made to Order (MTO) |
MTO |
Proudly made in the USA by CP Carrillo Pistons!
- Fully CNC machined
- Balanced to +/- 1 gram
- Double forced pin oilers
- Forged from high strength 2618 alloy
- Designed for maximum performance, horsepower and reliability
- Complete kit includes two pistons, ring sets, wrist pins and clips
- Follow ring end gap and piston to cylinder clearances as per the supplied instructions
| Product Name | 2015-2021 Yamaha R1 13.5:1 79mm std bore x 50.9mm stroke (998cc) piston kit with UHM |
|---|---|
| Brands | CP Carrillo |
Delivery & Freight
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What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What are the recommended piston-to-cylinder clearances for the M1131 piston kit?
For the M1131 piston kit, it is crucial to follow the supplied instructions for piston-to-cylinder clearances. Typically, a clearance of 0.0015" to 0.0025" is common for performance applications, but always verify with your specific engine build requirements.
What type of fuel is recommended for the 13.5:1 compression ratio of the M1131 pistons?
Due to the high compression ratio of 13.5:1, it is recommended to use high-octane fuel, ideally 98 RON or higher, to prevent knock and ensure optimal performance. Proper tuning is also essential to accommodate this compression.
Do I need to modify my cylinder head when using the M1131 piston kit?
While the M1131 piston kit is designed for a direct fit in the Yamaha R1, it is advisable to check the cylinder head for any necessary modifications, such as valve clearance adjustments, especially if you're aiming for high RPM performance.
What is the weight difference of the M1131 pistons compared to stock pistons?
The M1131 pistons are designed to be lightweight for performance, but the exact weight difference can vary. It is recommended to weigh both the stock and M1131 pistons to assess the impact on your engine's balance and performance.
Can I use the M1131 piston kit with stock conrods?
The M1131 piston kit can be used with stock conrods, but ensure that the conrods are in good condition and capable of handling the increased performance. Upgrading to performance conrods is advisable for higher power applications.
