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  1. J

    71 Evinrude normal compression?

    I’m sure someone knows what compression I should be carrying on my 71 18 hp Fastwin. I measure 89 and 91 psi but don’t know what the specs are. It’s running rough and I’ve changed plugs and have a good 5/16 spark, soaked the carb but am doing that again, adjusted the low speed till it started...
  2. J

    Local Evinrude mechanic needed

    Can anyone help me locate someone near my home in Salt Lake City, UT that works on old 2 stroke Evinrude’s? I have a 1971 Evinrude 18 hp Fastwin. Wouldn’t start this year but after going through the carb, I got it running. I am having trouble adjusting the low speed and would like someone who...
  3. J

    Hard starting at higher altitudes

    I have a 71 Johnson 9.5 and live at 4000 ft. Last winter I changed plugs, points, condensors, and replaced one coil. At home, in a barrel, I had it starting, with choke on, with one pull of the starter rope. Most lakes near me are at 6000 ft. At that evelation, it takes 30 or more pulls to...
  4. J

    How do I check for a good spark?

    I have a 1971 Johnson 9.5 and just finished replacing points, plugs and condensor. I checked to make sure I got spark by grounding the plug to the block and pulling the starter rope. One coil put out a bright spark, The other sparked but clearly not as bright. I used the same plug for each test...
  5. J

    Looking for a used 8 X 6 1/2 prop

    I need to reduce the pitch on my 1971 Johnson 9.5. I am currently running a 8 X 8 but at WOT I am running at 3900 RPM. Specs say I should be at 4000 to 5000, so I'd like to try a lower pitch. It's an old motor so I am in the market for a used prop. It is a 3 blade pin drive. Anyone got a source...
  6. J

    Hard starting 71 Johnson 9.5

    I pull the starter rope till I can almost not pull anymore before I can get my 1971 Johnson 9.5 running. Once I finally get it running, it runs great and will re-start with one quick pull of the starter rope the rest of the day. I have already adjusted the low speed. High speed jet is a fixed...
  7. J

    Looking for a used 8 1/4 X 7 prop

    I have a 1971 Johnson 9.5 with an 8 pitch. I took it from 1000 ft above sea level to 5000 ft. After rejetting the carb, I have had several folks suggest I drop from an 8 pitch to a 7. This is an old motor so I am looking for a used 8 1/4 X 7 pitch, standard rotation, pin drive. I have searched...
  8. J

    Motor cuts out at WOT

    My 1971 Johnson 9.5 runs fine at trolling speed. When I go to WOT, it periodically dies. After pumping the fuel line bulb, which had no pressure when it dies, it would restart with no problems. I am thinking two possible problems, lack of venting in the tank or fuel pump issues. Can anyone shed...
  9. J

    Where can I find rejet info?

    I have a recent post regarding no power at WOT. I have taken my 71 Johnson 9.5 from 1300 ft to 6000 ft. and it will not open up. Two local dealers suggest changing prop pitch. Several of you suggest a rejet which I like as my first option. Problem is I have contacted every dealer in my area and...
  10. J

    Is 35 psi compression too low?

    I keep reading posts that suggest actual compression is not as important as the variation between cylinders. My 71 Johnson 9.5 measures 35 psi in both cylinders. This seems way low to me, but I don't know what it should measure. Anyone have the specs on this motor? I did a decarb before I ran...
  11. J

    Will different jets improve performance?

    I am pulling out of moth balls a 1971 Johnson 9.5 that I had some 35 years ago when I was a kid. At WOT, it does not seem to achieve the same RPM as I recall it did as a kid. The big difference between now and then, besides more weight and grey hair, is a change in altitude. Originally the motor...
  12. J

    Exhaust Leak - Now What?

    I have a 1971 Johnson 9.5 that I am pretty sure has an exhaust leak. It had little power and from reading various posts, a decarb was recommended. The motor has not been run for years. I cleaned the carb, and found the high speed jet severly restricted from varnish. After the cleaning it ran...
  13. J

    No power at WOT

    I have a 1971 Johnson 9.5. It idles fine and is smooth at slow speeds. At WOT it seems I am only at about 3/4 speed or RPM. It does not bog down, just won't open up. I ran it for several minutes at WOT, and at one point it took off, only to stall shortly after. I had trouble restarting and noted...
  14. J

    Motor won't tilt

    I just got a 1971 Johnson 9.5 and need some help with the tilt. In the down position, I could not figure out how to release it to tilt the motor up. I manually pivoted the locking lever and eventually figured out that a cable connects the locking lever to the shift lever. Shifting to reverse...
  15. J

    Can I decarb in a barrel?

    I have read many posts about decarbing with Seafoam. The instructions include running a gallon of mixed gas with 3/4 can of Seafoam at WOT. If I remove the prop, can I do the same in a barrel? My logic is I need to get the RPM's up and if I remove the prop, I should be able to accomplish that in...
  16. J

    3M Scotchkote for aluminum leaks

    Cabelas sells a 3M Scotchkote Hot Melt Patch Compound for sealing aluminum boat leaks. It is a heat activated epoxy designed to wick into seams. I am interested in anyone who may have used this product, how well it worked or anyone who may have some information on how well this product works.
  17. J

    Need help with impellor replacement

    From the start, I'll let you know I am a novice at this so type slow and give me some help. I will soon tackle, based on your advice, an impellor replacement on my 1971 Johnson 9.5, model 9R71. I did buy a manual and want to make sure I do this right. I am actually planning to install a water...
  18. J

    How much to tune up my 1971 9.5hp?

    I plan to take a shot at tuning up this outboard myself, but wanted to know how much I would expect to pay to have this 71' 9.5 serviced at a shop. I need new points, plugs, condensors, impellor and a general tune up (carb adjust). I do not believe it needs a carb overhaul. This motor has been...
  19. J

    Unleaded versus leaded gas

    Years ago, there was no such thing as unleaded gas. Now, we can't find it. Are there any performance issues using unleaded gas in older motors? Would adding lead additives to oil/gas mixtures improve performance and motor life?
  20. J

    Is my 1971 Johnson 9.5 a gem or a dog?

    I recently acquired a 71 Johnson 9.5 and have not had it in the water yet. I have been asking for information on it through various posts. It is interesting to me that comments on this motor range from "one of the best little motors around" to "one of the weak links in the Johnson product...
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