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  1. H

    2003 Yamaha F4MSHB water/hose questions

    Found what I needed from the service manual. The hose from thermostat goes to the fitting in my second picture, it is a cooling hose. The other hoses in pic 4 were breather hoses. One goes to the intake silencer, other goes to a fitting near the flywheel. Video of Lehr propane 5hp converted...
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    2003 Yamaha F4MSHB water/hose questions

    I have a Lehr propane 4hp outboard motor that is a functional clone of the Yamaha F4MSHB. I've taken out the propane components and installed a fuel pump, carburetor and intake to convert it to run on gasoline. Only thing I'm having trouble with is I'm not sure how to route some (water/cooling?)...
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    Powerhead/Drive shaft housing dowel pin removal on an NSF5B

    Hey guys, I have a 2006 NSF5 (4stroke) power head I want swap onto the housing/lower unit of to a 90's NS5B (2 stroke) short shaft. The housings mate up apart from one problem: the dowel pins get in the way of each other (see pic). I need to pull it out somehow but a dedicated tool kit is almost...
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    NS8B lower unit questions

    No shavings or metal debris in the oil, the gears look pristine. I do not believe there was a nut ever in the first place as the pinion gear looks pressed on to the end of the drive shaft splines. See attached pic for a close up shot. I'm wondering if there are any good ways to pull out the...
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    NS8B lower unit questions

    I'm taking apart a 8HP NS8B two stroke lower unit since I found milky gear oil. I managed to pull the bearing carrier and prop shaft out but I'm stumped on how to pull out the driveshaft. The service manual says to use a special splined tool on the driveshaft to spin off a pinion gear retaining...
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    Gearcase/lower unit swap from NS5B to NSF5B

    Hey guys, quick question about the interchangeability of the gearcase/lower units on the early 2000s 2 stroke and 4 stroke 4-6hp Nissan/Tohatsu outboards. I'm looking to buy a used four stroke NSF5B long shaft, and I have a 2 stroke NS5B short shaft. The gear case and lower units look identical...
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    Yamaha F4 low compression, piston rings stuck in groove

    After installing new rings and putting the motor back together, I was able to get her back up and running! Currently breaking in.
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    Yamaha F4 4 stroke outboard crankcase bolt torque specs

    Put in a new piston and rings for this motor, but ran into problems with snapped crankcase bolts when torqueing to service manual specs: I had no problems getting to the first torque value (7.2 ft-lb), but I snapped 2 bolts torqueing to the final 16 ft-lb value: Are these bolts torque to...
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    Nissan NS8B water coming out of upper exhaust port

    I have a used 1990s NS8B 2 stroke 2 cylinder 8HP that is expelling a lot of water through the upper exhaust port on the drive shaft housing, see pic/vid: https://youtu.be/sLfe1hF0KiY I bought this motor used and converted it from a ultra long shaft to short shaft. I replaced the gaskets...
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    Yamaha F4 low compression, piston rings stuck in groove

    I bought a used 2015 F4 four stroke 4hp outboard for cheap, and the owner said it was hard to start even though he replaced the carburetor. Compression tests read pretty low, 30-40 PSI, which improved with some oil squirts. Checked valve clearance and it was good, eventually tore it down and...
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    2000 NS3.5B 2 stroke low compression

    One last question, I broke the #4 gasket sealing powerhead to driveshaft housing during disassembly and resealed the two surfaces uses high temp permatex red silicone RTV, which seems to be holding fine. However, the instructions say not to use silicone RTV where gasoline can contact. That area...
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    2000 NS3.5B 2 stroke low compression

    Managed to punch out the broken drill bit and tap new threads, all 4 head bolts installed and torqued to spec. No more weeping from head gasket! Thanks Paul and Tim for helping to troubleshoot and resurrect this motor. Can't wait to try it out on the river once the weather warms up!
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    2000 NS3.5B 2 stroke low compression

    This motor was originally purchased by my parents in 2000, they used it for 2 years before it sat in storage for a long time. I took it out recently and tried to fire it up with some fresh 50:1 mix, but it wouldn't start. Compression test showed low compression, about 40-50 PSI. Took the...
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