1964 Evinrude model# 9422 9.5hp hard start

[rodnocker68]

First... the history...
I bought this from my boss, who had bought it from someone on CL about a year prior but had never used it. I have it on a 14' semi-v aluminum boat that is 48" across at the transom. My first trip out two weeks ago resulted in the following. Very hard to start. Turns over ok, just did not want to fire. Priming bulb primed and tight, fuel tank valve open so it doesn't form a vacuum, and it took about 10-15 minutes before I could finally get it to start. To the point that I had blisters on my hand and had frayed the pull start rope. Once I got it started the first time though... I could cut if off and crank it with one pull. I head down the lake and can only get about 4.5mph and the boat will not plane out. I realize that all my weight is in the back of the boat (245lbs of me, 6 gallons of gas, motor, trolling motor and battery). I moved the battery to the front of the boat and it seemed to help a little. I was able to get up to about 6.5mph but still far from plane.

What I did...
I replaced the starter rope and found a hardened fuel line so I replaced that also. I found out that my motor should use champion j4j spark plugs but they don't make those anymore. They were replaced by j4c but I could not find those local. I found where someone is using j6c on the same motor I have but I could only find 1 local and I wanted to replace both (two cylinder). I finally found online where j8c's would work and I got those, gapped them at .030 per manual and put those in. I am running new fuel mixed 24:1 and 8oz of seafoam to 6 gallons of gas.

Next run...
I took the boat out this past Sunday. Still... very hard to crank. I primed the bulb until it was tight. I spent the next 50-75 pulls trying to crank it and it finally caught about 10 minutes later. For the rest of the day, it would only take one easy pull and it would fire right up. I even anchored to fish in one spot for about an hour, and it just took one easy pull and fired right up with no problem. Once I got it fired up... I was able to get up to 15.5mph and planed out nicely so I think the sparkplugs helped there.

My two issues are these.
1. Why is it so hard to start the first time? Could I be flooding it out by priming it to much?

2. When I go from idle to WOT (either slow or fast), it sounds like it has a hesitation, almost like it is missing a random spark, then it will finally clear (about 10-20 seconds) and smooth out and run fine.

Any help with these two issues would be greatly appreciated.

 

[ezeke]

Re: 1964 Evinrude model# 9422 9.5hp hard start

Priming fills the float bowl, but does not flood the engine unless the float valve is not working correctly. The engine pulls the fuel through by the vacuum created when the pistons move.

It's easier to start the 9.5 cold if you enrich the fuel mixture by using the choke until the engine fires.

It also helps a cold start to advance the timing by turning the throttle as far open as the neutral stop will allow (counter-clockwise until you hit the stop). You can throttle down once the engine fires.

If you service the carburetor, be sure to use an OE kit from your BRP/Evinude dealer so that you have the upgraded float valve with the spring clip to connect the float valve arm to the needle.

 

[rodnocker68]

Re: 1964 Evinrude model# 9422 9.5hp hard start

Priming fills the float bowl, but does not flood the engine unless the float valve is not working correctly. The engine pulls the fuel through by the vacuum created when the pistons move.

It's easier to start the 9.5 cold if you enrich the fuel mixture by using the choke until the engine fires.

It also helps a cold start to advance the timing by turning the throttle as far open as the neutral stop will allow (counter-clockwise until you hit the stop). You can throttle down once the engine fires.

If you service the carburetor, be sure to use an OE kit from your BRP/Evinude dealer so that you have the upgraded float valve with the spring clip to connect the float valve arm to the needle.

Thanks.. I will see if I can find a carb kit local and maybe get it done this weekend. Could this also cause it to seem like it is missing a random fire or the studdering sound it makes?

Also, I was told it uses 24:1 mix but the manual I have found lists it at 50:1 mix. Could someone verify which? I will run with 24:1 until I use up the fuel I have mixed now, but if it should be 50:1 then I will go with that next tank.

 

[Brokenrod]

Re: 1964 Evinrude model# 9422 9.5hp hard start

I know the 68 evinrude 9.5 uses 50:1 but you can go to 40:1 If im not mistaken, 24:1 is used when breaking the engine in after a rebuild? Hopefully someone better informed will chime in.

 

[ezeke]

Re: 1964 Evinrude model# 9422 9.5hp hard start

The fuel mix for the 1964 9.5 was always 50:1.

Use 87 or 89 US Octane. You will have less plug fouling if you use synthetic or synthetic blend TC-W3 oil.

The Champion 8JC plug is too hot for the 9.5. You can use the J6C, especially if you troll a lot or if the engine is worn. The recommended plug is the J4C.

 

[rodnocker68]

Re: 1964 Evinrude model# 9422 9.5hp hard start

As far as the 24:1 mix, I'm at about 3 gallons left so I will just add another 3 gallons and that should make it 50:1. I have found the carb kit local and will pick it up tomorrow. I will check to see if they have the Champion j4c or j6c when I pick up the carb kit.

Thank you very much for the quick responses and I will post back results as soon as I get this done and tested.

 

[rodnocker68]

Re: 1964 Evinrude model# 9422 9.5hp hard start

And the results are in...
I cleaned the carb by soaking it overnight in Goop carb cleaner and then rebuilt it the next day. I changed the champion j8c plugs to j6c. I took the boat back out and it ran great. Started on second pull (instead of 60th) and ran out great. I did loose about about 2mph (15.5mph to 13.3mph)... I'm guessing that is from the spark plug change. If it will make the motor last longer though, I have no problem with that.