johnson 9.5 compression test|johnson evinrude 9.5 hp problems : Chinese That compression seems on the low side. Take a good insulated handle screw driver, stick it in the plug wire and hold it 1/4" away from the block and crank the mtr over. If .
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I recently bought a 1965 Johnson 9.5. I changed lower unit oil and have started it and it pumps water fine. I decided to do a compression test and only got 60. Both cylinders . Ok, I started a thread a little bit ago about my 1965 johnson 9.5 having a "cough" at low rpm. I had taken the previous owner's word that the compression was 120 on each .Test. Compression : Compression on these motors may seem lower than some of the others. Displacement of the these 9.5 hp motors is 15.2 Cubic Inches with a Wide Open Throttle of .
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I'm taking a look at my friend's 9.5 Johnson for him and I was wondering what kind of compreesion I should be expecting. It's a 2cyl model MQ-14E, which I cross-referenced as .Test for retract ability. Compression : Compression on these motors may seem lower than some of the others. A normal compression reading of 65# to 75# appears to be fine for this motor. That compression seems on the low side. Take a good insulated handle screw driver, stick it in the plug wire and hold it 1/4" away from the block and crank the mtr over. If . Re: Compression questions about 1.5 & 9.5 HP Johnsons The 9.5 rope starter is geared to make pulling easier, so you can't get much speed to show a higher compression. You can get more speed with a rope on the flywheel, but no repeat strokes. If the rings and bores are perfect, you might get 90 PSI.
75# even compression is what I would consider very good for one of these. Many of them are high 60s to low 70s for compression. They are a low compression engine and it should run nicely with 75# on each cylinder.-Ben
1964 Johnson 9.5 MQ10 The motor will not run at high speed/fast Currently: (1) Motor starts fine (2) Idles fine (3) Both cylinder's compression checks fine (4) low and medium speeds run fine Part upgrades: (1) New points (2) New Coils (3) New condensers (4) New carburetor kit (5) New spark. couldn't wait [put it together , did timing with volt meter , first time for me , went well, good video on youtube , re do on compression test , all oil cleaned out dry cylinder , first top 87 bot 90 second 88 91 third 88 90 that sounds a lot better , all that oil really messed things up , got bottom end in , everything seemed to go good . Johnson & Evinrude Outboards . 9.5 1967 evinrude compression. Thread starter . What is the correct compression for this engine. I did a compression test and showed 70/70. I put a little oil in each cylinder and got it up to 120/120. The engine runs good, should I be concerned if the compression is this low? .
Also, this motor has low compression, 40 PSI nearly exactly on both cylinders, cold, using a Harbor Freight compression tester. Edit** just found out my tester is not accurate, need to get another one. Will update thread later when I get an accurate one.** The low compression may be a separate, but I will give more info below. worst motor Johnson ever made,.surely they made motors far better than this 9.5 from 1964 to 1974. Horrible running motor at idle especially. R. Rick. Captain. Joined Jul 30, 2006 . I would do a basic compression and ignition (spark) test on the motor before buying a carb kit, if you don't have access to the equipment for these tests (I'm .Maintaining Johnson/Evinrude 9.9 & 15 hp 2 cycle Outboards 1974 – 1992 (Information & normal repairs) 1974 Short Shaft: 1987 Long Shaft I bought an old boat to re-do last winter and have a question about the intake air path on the motor. It's a 1965 9.5 Johnson. I had the boat on the lake last weekend and the motor didn't run out 100% so right now it's on a stand and water barrel. The motor appears to be low hours and it looks.
''bulletproof'' 1970 johnson 9.5. all systems go!give it the ''once over'' and test run. runs great!9.5 seriesthis old outboard resurrecting small outboard m.
- Firstly, I bought a compression tester and got to test it just a while ago. I tested both the top cylinder and the bottom cylinder twice. The compression was 60psi on both of them. I am not sure if this is good. Re: 1970 Johnson 9.5hp list of problems 1 & 3, Start with some basic checks, spark, should jump a 3/8" air gap and be bright blue. Compression, check both cylinders, I would think you should have somewhere around 70-90 lbs and be within 10% of each other. 2, normally the engine is propped to the boat size to get the proper RPM at wide open . The thing looks clean, runs decent but a compression test shows only 108/109 psi. The compression test was done with a rather new Snap On compression gauge. I had a neighbor go with me to check it out, he works in a new car dealership as a mechanic for over 30 years. He seems to think its way low, he has an electric start 1980 15hp Johnson .
I have a 1968 Johnson 9.5 outboard that i've been working on. Done a bunch of cleanup on it to get it back on the water including the following for future reference: Carb clean, new fuel pump, new fuel lines, new Impeller, Gearcase oil, .
I pick up a compression tester today to check my new to me 1982 35hp. As long as I had it I figure I test my other motors. Are these numbers good? 1973, 9.5Hp 70psi both. 1981 15Hp 110psi both. 1982 35Hp 150psi top 160psi bottom. 1991 25Hp 115psi both. T-Mikes site https://t-mikesvintageoutboards.com/ T-Mikes Ebay Store https://www.ebay.com/str/simtechfarms .
Johnson Evinrude Outboard Forum . 1973 Johnson 9.5 high speed failure. Thread starter . I have set the new points with a gauge and light, compression is good, rebuilt carb including removing and cleaning main jet, new plugs, rebuilt fuel pump, all new fuel lines, connectors and fuel tank with vented cap. It starts first pull at about 6 inches . Just inherited a 9.5 johnson. I rebuilt the lower unit, cleaned up the old head gasket (new one on order now), changed spark plugs, and cleaned the carb. I tried to start it and got nothing. So i went to auto zone and got a compression gauge and it's pulling 50 psi in one cylinder and 60 psi in.1988 Johnson Outboard Restoration Menu Toggle. Remove an Outboard Lower Unit with a Stuck Drive Shaft; Replace a Johnson Evinrude VRO Oil Pump with a Standard Fuel Pump; How To Accurately do an Outboard Compression Test; How to Fix an Outboard Stuck Tilt Tube or Frozen Steering Rod; 1988 40HP Evinrude Johnson Carburetor Rebuild Hello - I purchased a 14ft aluminum boat on Monday with a 1969 Johnson 9.5 . I did a compression test tonight, both cylinders are right at 60 after 4 pulls, I'm in Colorado over a mile up and from what I've read about the 9.5's, this is fine. Both plugs are getting a spark
1964 9.5 HP Johnson MQ-10R passes Lake Test. I just bought a Jon boat that came with an MQ-10R. The seller said they could never get the motor running.Description: Troubleshooting Workshop Manual This is a full OEM Johnson Marine Outboard Boat Motor Service and Repair Manual. Johnson 1971 9-1/2 HP Outboard Manual Model Year: 1971 Model Application Survey: Year HP Model # Service Manual 1971 9.5 9R71 9RL71 JM-7104 Johnson Manual # JM-7104 Technical Specifications pdf Finishing up our De Winterization steps! Join us as we complete a full Compression Test on the cylinders! In the early 1970's, when you could still get good gasoline, outboard compression in the 180-190 psi range was common. If your 65 hp Johnson is running in the 100-150 psi range, this would be acceptable, and the engine should still perform well on todays fuel.
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Re: 1967 Johnson Low Compression it probably has never had a decarb, smoke could be carbon burning off. Decarb, take a can of seafoam put 3/4 of it in the gas tank, with only 1 gallon of premixed gas. put the rest in a spray bottle. start the engine, and let it come up to temperature. then remove plugs, and them some real good shot of seafoam into the cylinders, . I recently bought a Johnson 9.5 hp outboard from someone on Craigslist. The previous owner said it ran but has been sitting a few years. Went and got new gas for it, tried to start it and nothing. Wouldn't even turn over. So I poured gas/oil mixture down the carb and it started on the second. Hi Guys, I believe I've found the right place to post this! I recently purchased a little 12 foot aluminum and old Johnson 9.5 hp outboard ('64-73, I believe.) The motor appears to be in decent clean shape but the previous owner informed me that it has not been run in about 5 years. I .
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johnson 9.5 compression test|johnson evinrude 9.5 hp problems