Power Unit - Yamaha GX1800A Service Manual

Power unit

The new 6EV engine, developed based on the 6AN engine, produces higher output. The engine
components have been improved in strength and optimized for better functionality to handle higher
output.
2
Major changes
High-performance super-
1
charger
2 Large-sized air cooler
3 High-efficiency oil cooler
4 Forged piston
5 Piston pin
6 Fuel injector
7 Spark plug
2
1
6ET
Larger diameter impeller (from ø82 mm to ø86 mm)
Addition of fins (from 5 fins to 7 fins) to increase supercharged
pressure
Enlarged internal core improves cooling efficiency and
increases air density.
Regulates the engine temperature increase due to higher out-
put.
Improved strength
Shape of piston head has been changed to improve combus-
tion efficiency and to reduce pollutants in the exhaust gases.
Improved strength
Increased fuel flow
Heat range has been changed (from LFR6A to LFR7A).
6
7
1
3
9
Description
15
4
8
5
3