Installation manual

2-7
90-898305
Model 175 Optimax
2001 MY
This engine is based on the 2.5 Litre OptiMax. Differences between 175 HP
and the 150 HP, 2.5 Litre OptiMax are:
• ECM calibration
• Head bolts for the 175 heads will be _ inch shorter then the 135 and 150
HP.
• New open chambered cylinder head for increased power.
• Cylinder liners (different porting)
• Added holes in flywheel cover for increased airflow into air plenum to help
increase HP. Same cover will be used on 135 and 150 HP; calibration will
be changed on these models to keep HP within range.
Notes
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