Johnson 9.5HP (NR70A) Won't Start

[Nissan Newbie]

I just received a Johnson 9.5HP from my father in-law. Any idea why it wont start? I did a compression test and the upper was 71 and the lower was 74. I have spark and the carb is full of gas. Any idea's? :facepalm:

 

[Rick.]

Re: Johnson 9.5HP (NR70A) Won't Start

Your compression is great. I would wonder how old your gas mix is? You should do a spark gap test. You can buy a gap tester at most automotive parts stores for about ten dollars. It has a gap that you can adjust. Your spark should jump a gap of 3/8 inch and should be blue/white and snappy. Check your plugs and see if they are wet with fuel also. Let us know. Sharing a little history about the motor is often helpful. Has it been sitting long, did it work when it was used three weeks ago, etc. Best of luck. Rick.

 

[Nissan Newbie]

Re: Johnson 9.5HP (NR70A) Won't Start

I will give that a shot thanks! The motor was used probably 4yrs ago as a kicker on a bayliner at a place he called CQ that is known for great fishing here in the NW. He mentioned that the bow kept going under and they were really worried about getting back but it did great. it has been sitting on a stand he built for it since then. Thats all I really know... It seems a but "crusty" so to speak... When I pull on the starter cord it seems like I should have more of a turn then it does... I have the carb sistting in a carb dip right now cause he said hats what he thought was wrong with it. Hope that helps narrow it down! Thanks again for the fast response!

 

[Rick.]

Re: Johnson 9.5HP (NR70A) Won't Start

Good on you for going after the carb. Never hurts to have it cleaned IMO. There is a high speed jet behind the bowl plug. You really need a special tool to get it out but buy a can of spray carb. cleaner and spray the passage real good. Then do every passage you can find from both directions followed by a compressed air chaser. Rick.

 

[the machinist]

Re: Johnson 9.5HP (NR70A) Won't Start

With the type of starter spool that those motors have, this does not give a lot of fast rotation to the flywheel so your observation is correct.

Since it was used as a troller/backup motor at Sekiu, & probably spent a lot of time on saltwater, the points may have become oxided & therefore not functioning to their best, so it might not be a bad idea to pull some brown paper bag paper thru the points to slightly clean them without you having to remove, clean & reset them.

 

[Nissan Newbie]

Re: Johnson 9.5HP (NR70A) Won't Start

I'll give that a shot when I pull it out of the dip Rick thanks! And I see we have a WA State resident! Whats your hourly rate?? I'm serious! And thanks to both of you for your fast reply! Ok so I do NOT have spark... Where do I start?? Plugs, then magnito? Oh and Mach "Sekiu" not "CQ"is duelly noted!

 

[Rick.]

Re: Johnson 9.5HP (NR70A) Won't Start

Well you would do well to listen to "the machinist". He's forgotten more than I'll ever know or understand about outboards. So, start with the points like he said. Have a look at this when you have some time. http://www.sschapterpsa.com/ramblings/Ramblings.html I don't know if he does house calls, just be glad DR. Leeroy is in. Once your finished getting the wrinkles out it should start on a half pull so don't worry about the rope length. Rick.

 

[Nissan Newbie]

Re: Johnson 9.5HP (NR70A) Won't Start

Great news! I guess I did have spark lol. I pulled the carb out of the dip and hit it with some compressed air last night. Put it back together and it fired right up! Thanks again guys you have been a huge help!

 

[Rick.]

Re: Johnson 9.5HP (NR70A) Won't Start

It's not supposed to be that easy. Try harder to look for a problem. LOL. I have lots of compressed air here but it's never made my motors run!! Glad for you anyway. I kind of think you might be posting back soon. Rick.

 

[Nissan Newbie]

Re: Johnson 9.5HP (NR70A) Won't Start

Hey Only possitive talk on this forum Rick! lol I hit it with the air and it blew big chunks out the side of the carb! The main jet was clogged took me 5 tries to get air through. And I'm not done with this forum at all I have 2 other outboards and a zodiac 340! This is my first month with any type of outboard or boat so I think the bug bit me in the a** pretty hard lol. But im having a blast and learning alot! Thanks again

 

[Monte1961]

Re: Johnson 9.5HP (NR70A) Won't Start

It's not supposed to be that easy. Try harder to look for a problem. LOL. I have lots of compressed air here but it's never made my motors run!! Glad for you anyway. I kind of think you might be posting back soon. Rick.

It's that foreign air you guys use up in Canada!!!......lol

 

[Nissan Newbie]

Re: Johnson 9.5HP (NR70A) Won't Start

Lol I'm in WA so i'm sure that same air drifts my way I better keep my mouth shut!

 

[Nissan Newbie]

Re: Johnson 9.5HP (NR70A) Won't Start

Ok Rick you win here it is. I took it out last night and it is lacking some serious horse power... I turned the rich/ lean nob for about 30mins and it finally broke free...? I also noticed a leak in my primer bulb (will replace). I have need to have the choke open to run it at any copacity. Any ideas?

 

[Rick.]

Re: Johnson 9.5HP (NR70A) Won't Start

So if I would have said you'll be good for a life time....I wonder if? Remove the carb. Break it down and give it a very good cleaning and a new kit. There is a high speed orifice that you get at by removing the bowl drain plug. If you don't have the right tool, just make certain you clean it from both directions and use lots of compressed air as a chaser. Good tip on here this morning about using guitar string to clean out the tiny holes in the carb. throat. I'm not sure what you mean when "it finally broke free". Was that the engine performance or you just got the needle to turn? Rick.

 

[Nissan Newbie]

Re: Johnson 9.5HP (NR70A) Won't Start

I bet I would have been fine lol. Is this "high speed orfice" in the center of the bowl? About an inch long? After WOT for about 10 mins. it would about about double and speed and HP and just take off. Then if I throttled down again it would take another ten mins. to break free again. It feels like for the first 10 mins. WOT I'm using one cylinder then all the sudden the other fires up and she just takes off! So to respond to your question... performance. I will go at the carb again and soak it over the weekend again and hit it with air when I get back from vaca on Monday. I'll try the guitar string idea as well. Thanks again for your time and walking a nube through these motors I'd be lost without the help!

 

[Rick.]

Re: Johnson 9.5HP (NR70A) Won't Start

We're all new to this at one time or another. Start with the carb. and we can go from there. You might have intermittent spark but I really think it will be the carb. If that doesn't fix it then spark will be the next step. Just looked back to the start of this thread. Did you ever pull the flywheel off to have a look at the points and coils? Rick.