johnson 9r-70c

[floatingwoody2006]

Hello. Recently purchased a boat with this motor on it. It is a 9.5 from 1970 i believe. Reading posts here, it looks like this is not one of the better johnson designs, but alas.. It's what i am stuck with. So far it seems to run ok, but a couple of things need attention. The recoil starter spring let go, and i believe it needs to be replaced. I have the spring out, but cannot seem to figure out how it comes apart. I have the allen head screw out. Also..It a shaker, and i think that affects the low idle of the motor. does not idle well. I talked to a guy who identified this as an issue, and he said they made an aftermarket kit to help with this. Does anyone have a clue how this could either be re-created, or purchased? Thanks..

 

[Chinewalker]

Re: johnson 9r-70c

The shaking may be due to bad motor mounts - not uncommon on the mushroom motors. Some of the shaking may be due to the poor idle - not the other way around. Sounds like it might be running rich. Have you adjusted the idle mix screw at all?

They were a good running motor, but if you're unfamiliar with them, they can be a pain to work on. Getting to the motor mounts requires a fair bit of disassembly. Finding new motor mounts can be pricey - I've seen a few that had the mounts home-brewed with a combination of bolts, rubber bushings and washers.

Once you're done, the motor ought to last another generation...

- Scott

 

[tashasdaddy]

Re: johnson 9r-70c

the starter is held in place by a plate with, i believe 3 screws. remove them, and take the starter assembly out. i have found this the easiest way, to reassemble. pull the spring out of the assembly. on the bottom it has a "hook" insert it into the mount and turn counter clockwise, if will eventually side into the slot, and catch.

now slide the rope housing over the spring, there is a slot in it to catch the top of the spring. now fast the plate on to the motor, leaving the support rod out, temporarily.

turn the assembly counter clockwise, so the bendix comes up, insert the handles of a pair of pliers, under the bendix, so it does not come down. the starter is no locked in that position.

you can now, start to thread the rope around the start assembly. periodiccally pull the rope to tighten the spring, and reinsert the pliers. when you finally have enough tension, very carefully loosen the screws, and slip the support rod into place. tie your handle on and start, starting.

 

[floatingwoody2006]

Re: johnson 9r-70c

I have attempted to adjust the idle on it. The idle mixture is on the side of the handle on this unit. I turned that all the way in, then backed out about 1 1/2 turns to start with. The knob on front is missing, but i adjusted the mixture to about 3/4 out to start with. It runs, but seems to idle high, and when i try to adust it down to a low idle, sneezes out, and fouls the plugs.

Thanks for the recoil breakdown Tashasdaddy..I have a broken "hook" on that spring apparently. I can see part of it sticking thru the and, but is unattached inside. also the rod that goes thru it is D shaped at the end. Hopefully it is designed this way and not itself broken..

As a side note..The 3 bolts in the recoil also has a gasket under there to help the water circulate. If you start it without the recoil attached, instant guyser.

 

[tashasdaddy]

Re: johnson 9r-70c

that is not the idle mixture screw, that is the idle speed stop. the idle mixture is on the front of the motor, next to the choke, with a wire attached that runs to the carb.

the knob one the side of the handle, is there so you can set a speed and the motor will not go below that. great for trolling, you can lock the motor in the straight position, set the speed, and not have to hold the tiller.

wish i had a 9.5 in the shop to take pictures. i will the next one i get.

 

[floatingwoody2006]

Re: johnson 9r-70c

AhhhRevelations..So if i turn that idle stop all the way in, and just work on the main idle on the front, thats the way to adjust. That would explain the high idle..Thanks Man!!

 

[floatingwoody2006]

Re: johnson 9r-70c

Well.. Looks like the spring holder / rod inside the recoil has broken, and the spring also i believe. If anyone knows where i can order these, i would be very greatfull. Hopefully i can have them overnighted so i can be on the water this weekend. Thanks. And thanks again for the hints on the idle.. Got it running good after going out 1 3/4 on the idle, and a bitmore.. Was a "lean Sneeze"