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  1. H

    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

    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 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

    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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