Johnson 6HP 1970

[CAC]

Hi
Im trying to get started a 1970 Johnson 2 Stroke 6HP that hasn't run in a year.
Got good compression 75 psi
Got spark on both plugs
Fuel is going in carb.
Does not fire up, does make an encouraging putt putt noise on turnover.
Whats next check ?
If its points and condenser then my next question is where can I get a strap wrench with about 55CM strap as I will have to take off the Flywheel. On Ebay but not long enough.
Many thanks Dave.

 

[LBRodders]

Is it fresh fuel you are using?

Fuel maybe going in the carb, but is the jets/bowl blocked with old fuel?

Clean up the face between the block and the spark plug?

 

[CAC]

Is it fresh fuel you are using?

Fuel maybe going in the carb, but is the jets/bowl blocked with old fuel?

Clean up the face between the block and the spark plug?

Is it fresh fuel you are using? No, but I will , just waiting for some TCW-3 2 stroke in the post.

Fuel maybe going in the carb, but is the jets/bowl blocked with old fuel? I have a carb kit , that i intend to fit. was hoping to get it started then fit it.

Clean up the face between the block and the spark plug? OK , What will this do ?

 

[LBRodders]

I assume you grounded the plug(s) on the block to check for a spark when they were removed?

Well when they are screwed into the head, the 'hole', 'plug well' and the 'plug face' create that ground / electrical circuit to make a strong spark.

If that area is covered in cr@p (no circuit), then you may not generate a spark, or not enough of one. But obviously you wont see this.

 

[CAC]

I assume you grounded the plug(s) on the block to check for a spark when they were removed?

Well when they are screwed into the head, the 'hole', 'plug well' and the 'plug face' create that ground / electrical circuit to make a strong spark.

If that area is covered in cr@p (no circuit), then you may not generate a spark, or not enough of one. But obviously you wont see this.

Makes complete sense. yes I grounded plug with mole grips to see spark.

 

[JBPa]

Spray some starter fluid (ether) in the air intake, if it runs for a couple seconds, it's probably a dirty carb.

 

[QBhoy]

Hi. A betting man would almost certainly have money on the carb needing a proper clean. As in…thoroughly and preferably with a US cleaner.
Also…please ignore the following if you are already familiar with the usually required wee trick to starting an old 2 stroke after laying dormant for a while.
Choke on…lots of throttle (after priming the fuel obviously)…pull her over a couple of times…until she gives a sign of life…then it’s either choke off and lots of throttle or go again with choke on and a mind to catch her on the throttle and choke off or regulated in fairly sharply to keep her running.
I’d also say that it’s unlikely that 75 psi is or had ever been considered good or healthy on an engine like this. That’s if your gauge is accurate. Ideally the usual figure of acceptance might be closer to or above 100 psi really. But I’d also say that, should your gauge be accurate and she is as low as 75 psi…it’s likely she would still show a sign of life at least, probably fire up despite it. Where upon, the compression figure tested there after, should improve.