Compression questions about 1.5 & 9.5 HP Johnsons

[LittleLakeKerr]

How much compression should each have? The 1.5 is a 1970, the 9.5 is a 1971.

 

[Whoopbass]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

I don't know what they should have but they will probably be 60-70 lbs for the 1.5 and around 75-90lbs for the 9.5.
You can add around 10 psi since their rope start. Electric start spins the motor faster and will give you a higher reading.
Pull the plug(s) and squirt some wd-40 before you pull.
Your motors should run fine with the above readings.

 

[ezeke]

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. Just be happy if the readings are within 10-15% of each other.

 

[LittleLakeKerr]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

Thanks to both for the replies. The 1.5 has 75# and the 9.5 has 78 and 80#.

I now have the carb off, but cannot get the float chamber separated from the body. I'm afraid to pry or hit it. How do I get apart without damaging any thing? Is it possible the last person who worked on it used permatex or something similar?

One last question (for now), Need suggestions on finding parts. I have looked at several sites for carb kits. Even those that list parts for 70's era, seem to ignore the 9.5 HP.

Thanks in advance for the great answers to come.

 

[ezeke]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

The correct carburetor kits are only available through BRP/Evinrude authorized dealers. Part # 0382048. http://www.evinrude.com/en-US/Find-a-Dealer

There are quite number of online BRP authorized dealers.

If you have the four slotted screws removed, the float chamber should separate unless someone used sealer on the gasket. If sealer was used, you will have to pry it apart.

 

[LittleLakeKerr]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

Thank you Admiral ezeke. I have the bowl and body separated.

As far as the carb kit, at http://shop2.evinrude.com/ext/index.aspx?s1=5d90e75754892b6320f4926e2e2f7c85, I found the carb kit # but I was flummoxed because they do not have a listing for it as a kit. I was fearful each part had to be purchased individually. Don't know why I didn't just Google - Carb Kit 382048, which I did this mornibg and found several sources - OEM and after market.

Last night I forgot to ask about the low speed needle situation. My carb has the flex type, however there is no spring and washer on the flex shaft. The flex shaft shaft is connected to a packing nut set up. Is this a late change no even discussed un the manuels or someones Rube Goldberg.

I paid a Jack Leg $225 to get it running a couple of years ago. It ran for about and hour and would not start. Has been sitting since.

Should I reassemble as is, or order the spring to return to original.

 

[ezeke]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

If there is an aftermarket kit, don't buy it because it will not have a float, which you need. The floats are cork sealed with shellac and they don't hold up very well.

It's possible that you don't have a 1971 carburetor; they stopped using the packing nuts with the 1965 9.5HP motors.

 

[LittleLakeKerr]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

Just to make sure I understand...

My 9R71 (verified on nameplate) may have a carb from a 1965 or earlier?

My manuel says, "The early model needle valves extended out of the carburetor with an O ring, spring, and E-clip. The needle valve was controlled from the front of the engine by means of a flexible cable."

"Later model carburetors are equipped with a long packing nut and linkage..."

My understanding of your response is that 1965 and earlier carbs had the flexible cable with a small packing nut and no spring. So there were three evolutions:
1) cable and small packing nut
2) cable and spring
3) linkage and long packing nut

Mine has the first model and it is ok to put back as I found it???

Thanks for your continued help.

 

[ezeke]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

To the best of my knowledge, there are only two basic versions of the 9.5 carburetors' needles. The ones with the packing nuts and packing are the early ones and the after that they all had the o-ring and spring.

 

[LittleLakeKerr]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

I'm using two printed resources - a SELOC manuel and a CD I purchased on line. Both say the same. The early model has the spring (SELOC pg 3-27) (CD version pg 4-31). Whereas you are saying the spring is on the later model.

I'm getting more confused, so let's go to the bottom line. My carburetor has a flexible cable needle valve which is connected to the carb thru a small packing nut, which may or may not have packing. As it is beginning to appear this is a previous Rube Goldberg, could this be the source of problems? Should I order a spring to make it original?

Actually, now that I think about it, I would prefer to put it back together as the later version under the assumption that is an improvement Johnson made. But, which is the later version? Do I go with the manuel or your recollection?

 

[ezeke]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

You have to work with what you have; if the opening on the carburetor is threaded for the packing nut, then you have to use the packing nut.

The later models don't have the packing nut, but have a smaller threaded opening for the needle's threads.

I don't see any reason why you could not use an o-ring for packing the older style, but you would have to find the right size.

There is no issue about right or wrong manuals. The factory parts catalogs for 1968 through 1973 9.5HP motors are all online and free at the BRP parts catalog site so you can clearly see what parts were used on each year's carburetors. http://shop.evinrude.com/

It's difficult enough to work on the 9.5 with a factory manual; I can't imagine trying it with a general purpose manual like Seloc or Clymer.

Used factory manuals for the 9.5 are on Ebay practically every day for short money; except for the paint job and cover, the Evinrude and Johnson 9.5 motors are identical. http://shop.ebay.com/?_from=R40&_tr...+9.5+Service+Manual&_sacat=See-All-Categories

 

[LittleLakeKerr]

Re: Compression questions about 1.5 & 9.5 HP Johnsons

Thanks for all your replies. I just purchased a shop manuel on eBay. Hopefully, it will do a better job of explaining how to sync the fuel and ignition, than those I have been reading. I'll ask questions about that after I get the carb back together.