1968 johnson 1.5 hp compression

[gramacorp]

I have a 1968 johnson 1.5 hp sc10s. Does anyone know what the compression should be on this motor?

 

[oldcatamount]

Re: 1968 johnson 1.5 hp compression

A guess would be 50 - 70Lbs (at least), maybe higher, but those numbers would be sufficient to make it run.

 

[gramacorp]

Re: 1968 johnson 1.5 hp compression

Compression gauge is reading 45, I thought that might be alittle low. Rumor has it these little motors did not have alot of compression to begin with.

 

[oldcatamount]

Re: 1968 johnson 1.5 hp compression

I'd bet it'll run ok at 45lbs. Have you had it running at all?

 

[gramacorp]

Re: 1968 johnson 1.5 hp compression

Yes it does run. Im having issues with the carb flooding. i took it apart. Appears i will need a new float and needle just wondering if its worth the time and money.

 

[oldcatamount]

Re: 1968 johnson 1.5 hp compression

A new carb kit with the float (and maybe a new spark plug) shouldn't cost more than 20 bucks. Definatley worth that much.

 

[boobie]

Re: 1968 johnson 1.5 hp compression

After your done with the carb, decarb the mtr and the compression may improve.