oil and fuel mix?

[Accord4tehloss!]

Use a mix of oil and gas as a starting fluid. Prevent it from seizing friend did that to a weed eater one time. 32 to 1 is 8 ounces per gallon btw. I would use reg oil for now and until it starts running right before switching to 100 to one synthetic.

 

[CopyKat]

Run a 30:1 to a 40:1 to start with. My 73 JD600 and 80 Jag both require 40:1.

You'll have to pull the carb off and pull it apart. Check to make sure the gaskets have not dried out or gummed up. My need to look around for a set of gaskets for the carb. With it being a 71 I'm going to assume the fuel pump is in the carb. There would be like 8 gaskets to the carb.

 

[stegomon]

ok....i will pull it off tomarrow and see what i can find.....it is the twin cylinder!...hopefully i can get thing thing going!!!

 

[Mark_88]

Check to make sure the exhaust manifold is tight before you go rebuilding the carb...I have an older snowblower that died suddenly and would not start...went to a small engine rebuilder and, fortunately, he was too busy to even look at it...he suggested the carb needed rebuilding though...

When I got home I found a long screw fell out into my hand when I was trying to drain the carb...it was the exhaust manifold bolt (one of two) and when I tightened it back in place the engine ran fine...

That's how I know backpressure is important to some engines...I think!

 

[rboyer]

Backpressure is VERY important with 2 strokes and in some cases resonant sound waves also play a part in the efficiency of the engine. That pressure is used to keep your air/fuel mix inside the cylinder during that brief period of time when it is exposed to the exhaust port right before being ignited (during the upstroke).

 

[Shran]

Rebuild your carb. Since it's that old it needs it. Just general maintenance. Also make sure that the exhaust isn't plugged anywhere. This is insanely important especially if there is a piece of metal screen in the exhaust somewhere. They get clogged with carbon really fast and fuel mixtures rich on the oil side will contribute a lot to this.

if its a single cylinder it won't have reeds, when I had mine i had the same problem and it turned out to be water had gotten into the carb and popped a welch plug loose. I ran 20:1 and I could run it for almost two seasons on one plug. it was a tank, slower than death but fun to ride.

I've owned couple single cylinder engines with reed valves...actually a lot of older outboards have them and so do Weed Eater brand equipment. Those are just some examples that come to mind. Been a while since I worked on small engines...used to be hardcore into that shit.

 

[stegomon]

rebuilt it...looked nasty....now need new fuel line...the old stuff broke i thing after an other with this