Description
Complete Yamaha Blaster Engine Seal Kit by KOR
The KOR Complete Yamaha Blaster Engine Seal Kit gives you the essential replacement seals needed when rebuilding or repairing a Yamaha YFS200 engine. Engine seals become hard, worn and damaged with age. Reusing old seals can result in air leaks, transmission-oil leaks, poor performance and serious engine damage.
This complete seven-piece kit is a smart choice whenever the crankcases are split or the engine is undergoing a bottom-end rebuild.
Protect Your Yamaha Blaster Engine
Proper crankcase sealing is especially important on a two-stroke engine. A leaking crankshaft seal can allow outside air to enter the engine or permit transmission oil to reach the crankcase. Either condition can cause poor running, difficult tuning, excessive smoke or a dangerously lean fuel mixture.
Installing a new Yamaha Blaster engine seal kit during assembly helps restore proper engine sealing and gives you confidence that old seals will not compromise your fresh rebuild.
Ideal for Complete Engine Rebuilds
Engine seals should be replaced whenever a Yamaha Blaster engine is completely disassembled. Even when an old seal appears usable, removal can damage the sealing lip or outer surface. Age and heat can also make the rubber hard and less effective.
The KOR seal kit is recommended for:
- Complete Yamaha Blaster engine rebuilds
- Bottom-end and crankshaft replacement
- Crankcase repairs
- Transmission repairs
- Replacement of worn or leaking seals
- Restoring an older Yamaha YFS200 engine
- Preventive maintenance while the engine is apart
Product Features
- Complete seven-piece engine seal kit
- Fits Yamaha Blaster YFS200 engines
- Covers model years 1988–2006
- Suitable for stock and modified engines
- Helps prevent crankcase air leaks
- Helps control transmission-oil leakage
- Recommended whenever the crankcases are split
- Convenient complete kit from Ken OConnor Racing
- Professional engine-builder quality
Why Replace Every Engine Seal?
Replacing only the seal that is currently leaking can lead to additional repairs later. If one original seal has become hard or worn, the remaining seals have usually experienced the same age, heat and operating conditions.
Installing the complete kit while the engine is already disassembled saves time and helps prevent another teardown. Engine seals are inexpensive compared with the labor and potential damage caused by an air leak or oil leak.
Built for Yamaha Blaster Owners
Ken OConnor Racing specializes in Yamaha Blaster engine machining, rebuilding and performance work. This kit was selected for Blaster owners who want the correct parts for a dependable engine repair.
For best results, inspect all shafts and sealing surfaces before installation. Lubricate the seal lips during assembly and install every seal in the proper direction and at the correct depth. Replace any worn bearings, damaged shafts or grooved sealing surfaces before completing the engine.
Fitment
- Make: Yamaha
- Model: Blaster YFS200
- Years: 1988–2006
- Application: Complete engine and bottom-end rebuilding
Package Includes
- Seven Yamaha Blaster engine oil seals
- One complete KOR engine seal kit
Professional installation is recommended. Confirm that every seal is installed in its correct location, direction and depth before operating the engine.
Frequently Asked Questions
Does this seal kit fit every Yamaha Blaster?
Yes. This KOR Yamaha Blaster engine seal kit is designed for Yamaha YFS200 engines from 1988 through 2006.
Should the engine seals be replaced during a rebuild?
Yes. Engine seals should be replaced whenever the crankcases are split or a complete bottom-end rebuild is performed. Removed or aged seals should not be reused.
Can a bad crankshaft seal cause a lean condition?
Yes. A leaking crankshaft seal can allow unmetered air into a two-stroke engine. This can create a lean condition, make the carburetor difficult to tune and potentially damage the piston or cylinder.
What are common symptoms of a leaking engine seal?
Possible symptoms include an erratic idle, difficult carburetor tuning, transmission-oil loss, excessive exhaust smoke, poor starting and a failed leak-down test.
Should I perform a leak-down test after installation?
Yes. Every rebuilt Yamaha Blaster engine should be leak-down tested before it is started. This confirms that the crankcase, seals, gaskets and mating surfaces are properly sealed.
