Since the restoration of the boat is complete, it's time to move onto the new motor build/a.k.a. "REPOWER". Current 2000 90 HP Yamaha that came with the boat is severely under powered, won't even get on plane with water in the wells. Boat is factory rated for 150 HP. So I bought a blown 1999 Merc EFI (minus a lower unit). So follow along as the "REPOWERING" journey begins as this is an over the winter project which will include a complete gut of the Yamaha wiring and converting to a Merc harness.
Donor Motor 1999 Merc 175 EFI:
Getting ready to strip it down:
Upon disassembly I found the cause of why motor blew.
Motor spit out the rod bearings on one cylinder that caused
all the block damage. With flying roller bearings in the block
when it happened it was like shrapnel from a bomb going off.
Needless to say the crank was trashed as well...........
Here's what I found:
Sleeve damage:
Numerous holes in the block webbing:
Hole in cylinder floor":
20" Mid and Stock Heads off to Chapman Racing for some mod's.
Mid will be cut to 15", installing a new 200 Tuner, Cutting Heads to
run Premium Fuel, adding Bob's solid motor mounts (top & bottom):
Started to do some exhaust port work while waiting on parts to be delivered.......
I'm a little behind on documenting this project, I'll update shortly....................