Johnson

Johnson, Evinrude, OMC, outboard motor, outboard motor repair, 9.5 hp, date/year of manufacture, water pump, carburetor,

Maintaining Johnson/Evinrude 9.5 hp 2 cycle outboards

1964 – 1973 (Information & normal repairs)

The 9.5 hp, shown below was built from 1964 to 1973, which was a the first of the low profile motor series, and is not a sleek looking motor in my opinion, with a squatty oversized motor cover & upper housing sitting on a standard lower unit. Someone coined the phrase "Turtle Motors" for these squatty motors.

There are some similarities between this motor & the earlier motors from 6 to 10 hp but with the powerhead setting lower & a shroud around the mid-section. However it seems the engineers worked overtime in trying to find a place for needed parts to fit under this squatty cowling.

I understand it was also basically a souped up 7.5 hp powerhead. Some experienced mechanics say the crankshaft did not stand up under heavy usage as a 9.5. But then in the early years of these motors was before the TWC-3 outboard oil came into being, so that use of automotive oil could have also have been a contributing factor.

The carburetor is placed on the rear starboard side of the block. Carburetor removal is easy. Just put in forward and throttle up (engine off..) to get the stator cam out of the way for the last screw. You'll see when you go to remove it. If you are adjusting the low idle in a barrel or such, your going to drive yourself crazy. Because the low setting of this engine, the carburetor intake sucks some of the exhaust from the barrel & makes it idle rough. Your best option is to take it the lake or pond, & adjust it on the boat under a load.

Most of these motors you will see are short shafts, however they did make a longshaft as shown in the photo below. From what I can tell probably just a longshaft 5" extension off an earlier 10 HP QD motor.

The lower unit was not unitized like the later 9.9's, & it appears that they actually use the lower unit (gearbox) off the earlier QD series.

It apparently was not originally designed for remote controls, however I have seen an aftermarket version & the one shown below did appear later on OMC literature for accessories. This is evidenced by the taller shifting lever on the motor in the photos below.

Evinrude 9.5 front view	Evinrude 9.5 rear view

The manual recoil starter pull handle is located on the front lower part of the front panel. The actual starter is basically a manual copy of the automotive type starter system

Compression on these motors may seem lower than some of the others. If you'll notice, the "rather unique" starter system on this motor is geared pretty low, presumably to make pulling the rope easier. As a result you don't get the crank speed you do on some other motor designs. This will effect your compression test. You might try using a rope wrapped around the flywheel as a comparison, using this method, you will get a faster RPM & also a higher compression reading. For those used to working on other brands of outboard motors, it seems that smaller hp OMCs are designed with a lower compression ratio than Mercurys. A normal compression reading of 65# to 75# is fine for this motor.

The 64 -66 has an plastic adjuster (Idle stop setting) just rearward of the flywheel (spark plug side) that adjusts the armature plate stop. It has a thumb screw on it for easy adjustment, but you need to pull the cowling off to access it.

For the later motors at the base of the tiller handle there is an idle adjustment knob as shown in the photo below. Turn that to set the idle speed.

Also changing the water pump impeller is not as easy as the others because the water supply tube to the powerhead will many times come undone at the powerhead & it is a problem getting it back in place.

Here is a running motor, notice the overboard water blubbering out the rear