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    Yamaha 3.0 Head Design - unique??

    Understood, So that is good news as far as just needing a Gasket vs a new Manifold. Thanks Scott!
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    Yamaha 3.0 Head Design - unique??

    Does anyone know if Yamaha designed / manufactured their own head for use on the GM 3.0 block? I think I have a leak from the exhaust gasket, and hoping I can use a gasket from a Mercruiser or similar. Advice...? Thanks in advance,
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    Yamaha L4 3.0 seawater pump impeller??

    I'm not an expert, really just a Back-yard Mechanic / Gear Head. I don't believe Oil Seals will effect water leaking - not positive though My pump works perfectly with the Jabsco impeller. It came with 2 O-rings and a gasket. I only used the Impeller and the Thin O-ring. (I didn't open the...
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    Yamaha L4 3.0 seawater pump impeller??

    My pump is working perfectly with this Impeller; It does sound as though you may have an Air leak if the pump functions as you mention when not connected to the Raw Water Hose leading from the drive.
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    Overheated water shutter debris removal

    Thanks Scott, I have a new shutter, couplers etc. As you said "Burnt up all the rubber bits..." Do I need to be concerned about where the rubber debris has ended up?
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    Overheated water shutter debris removal

    Hello all, I'm not only new to the forum but also a new -1st time boat owner. Issue; Overheated the Yamaha L4 3.0, (water pump drive belt failed) Belt replaced along with a 140* Thermostat. Prior to the Overheat, it always ran at 140*, now runs at 150*+, not the same power, and a very...
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    Yamaha L4 3.0 seawater pump impeller??

    I have ordered the Jabsco 1210-0001, ($55.00 CDN on Amazon) from my research this is the correct crossover from the OEM part; YSC-70R-12457-00-00 My current installed is a 12-blade - still working great, just old and had sat for a couple of years. Check this website...
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