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School me on MR1 differences

Blazin14

Jet Boat Junkie
Messages
119
Reaction score
88
Points
147
Location
Elkton MD 21921
Boat Make
Yamaha
Year
2007
Boat Model
AR
Boat Length
23
29-410 non HO
29-411 HO

How can you physically tell the difference. two ways:

1) The valve cover vent pipe is in a different location; HOs are toward the timing chain (rear) and non HO are in the forward slot (see the open slot, opposite the black block-off). The screwdriver is pointing to where the HO vent pipe should go.
2) Non-HO Inlet water to the block has 1 curved pipe. HOs are both straight. (No he, she or they or them)

These pictures are non-HO.

update: a Non-HO can not be swapped with a HO without some modifications and vise versa...
 

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