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    First Compression Test On Rebuilt Powerhead

    Rebuilding 1997 Yamaha 150HP 2 stroke Saltwater Series II S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />I got the heads installed this evening and ran a compression test (without the intake and carbs on, but I did add some extra lube in through the...
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    Spark Plug Hole Head Thread Problem

    Rebuilding 1997 Yamaha 150HP 2 stroke Saltwater Series II S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />The hole for the spark plug on the head where shavings of blown bearings were spit through has a problem. Head is still off the block.<br /><br...
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    Round Water Passage Holes At Base Of Powerhead

    Rebuilding 1997 Yamaha 150HP 2 stroke Saltwater Series II S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />At the base of the powerhead there are 2 circular water passage holes that match up with round holes on the midsection.<br /> <br /><br />In...
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    Question For All Who Rebuild Powerheads

    Rebuilding 1997 Yamaha 150HP 2 stroke Salt Water Series II S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />I have all my parts, and this Saturday expect to rebuild the powerhead and get as far as I can.<br /><br />Problem I have is that for the last 2...
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    Block Water Flow & Water Cavity Pressure Testing

    Rebuilding 1997 Yamaha 150HP 2 stroke S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />Trying to understand where the water comes in to the block from the sea, and where the water exits back out of the block.<br /><br />I have about an inch tube that goes...
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    Pushrod Observations

    Rebuilding 1997 Yamaha 150HP 2 stroke S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />I found that the 3 used rods I purchased from the salvage shop don't have the same numbers on them. All of the orig rods had the number 6 printed on them. <br /><br...
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    Center Main Bearing Block-Valve Problem

    Rebuilding 1997 Yamaha 150HP 2 stroke S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />Inspecting the crank side of the block found that for the lower center bearing, the valve that connects back to cylinder 3 is missing the piece inside the "fingers" so...
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    Need I Use Thread Locker?

    Rebuilding 1997 Yamaha 150HP 2 stroke S150TXRV powerhead.<br />( Click here to view blog with pictures )<br /><br />Book makes no mention of using a threadlocker on any threads. Do any bolts on the PH need thread locker and if so, which bolts and what brand and flavor of threadlocker?
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    How To Weld Hole On Block - Exhaust Separator

    Rebuilding 1997 Yamaha 150HP 2 stroke S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />Pressure cleaned the block today which I later discovered a 1/4" chunk was missing from exhaust separator on block. This missing chunk is part of a mating surface...
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    Puddle Valve Inconsistancy

    Rebuilding 1997 Yamaha 150HP 2 stroke S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />Rodbolt, read your explanation of puddle valves, and it helped, but still have questions ( manual is incomplete ).<br /><br />Cleaning the block today I blew...
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    Removing Lower Bearing From Crank & Replacing

    Rebuilding 1997 Yamaha 150HP 2 stroke S150TXRV powerhead.<br />( Click here to view updated blog with new pictures )<br /><br />Clymer manual says "Install a universal puller plate....Use a piece of hard plastic or wood to protect the crank surface from the press. Suport the crank and operate...
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    Mixing and Matching Pistons

    Rebuilding an S150TXRV Yami.<br />(Click here to view blog ) <br /><br />Need 1 oversize piston. Leaning towards aftermarket.<br /><br />Need 1 std piston. Leaning towards aftermarket.<br /><br />Remaining 4 pistons (std and assumed to be OEM) I expect to cleanup and use.<br /><br />Any...
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    Reed Stops & Reed Valve Inspection

    Rebuilding 1997 Yamaha 150HP 2 stroke S150TXRV powerhead.<br />( Click here to view blog with pictures )<br />(first time rebuilder here)<br /><br />I inspected the intake. The reed valves themselves look clean and shiny with the exception of 2 which each have a tiny eigth inch area of surface...
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    Different Piston Sizes

    Rebuilding 1997 Yamaha 150HP 2 stroke S150TXRV powerhead.<br />( Click here to view blog with pictures )<br /><br />Working on ordering parts for the rebuild.<br /><br />Found 2 different piston sizes. Which is correct for my motor?<br /><br />64D-11631-01-90 PISTON (STD)<br /> This part has...
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