General Category > Simplex Sportsman
1959 sportsman . Having trouble making it run
razerface:
What is compression supposed to be? I have 70lb on 150cc engine. Having trouble making it run. It sat for 12 years.
Ricks:
It should run fine with 70 pounds. I assume you checked for spark? Did you put new plugs in it? What did you set the gap at? After it wouldn't start, did you remove the compression cover? If so, did a lot of fuel leak out?
razerface:
Yes, new plug and it has spark. If 70 lbs is ok, it has to be carb problem i guess. It fires on starting fluid. When it does start, it runs like a hit & miss engine,,clears up and runs until you let off throttle. It must be kicked a couple thousand times to get running.
I cleaned carb. New needles and seats and adjusting screws. May have to take carb back off since junk got in line from tank before i mounted a filter on fuel line.
Where do you set adjusting screws to start with on rebuilt carb?
Please explain the compression cover thing? Just checking for flooding?
Ricks:
The compression cover is the big cover on the side of the motor. Inside that cover is the compression plate. If you have a bad needle and seat in a jet or float, a lot of gas will collect in the engine base. By loosening the side cover, the gas will run out.
Did you buy a new Carb or rebuild the one you have? If using a stock carb, turn both screws in all the way, but don't crank on them. Then open them both 1 turn. That should get you in the ballpark. If you bought one of the reproduction carbs, I have found them to need about 1 1/2 turns.
razerface:
Rebuilt stock carb with all new parts. Single plug cylinder. Does the compression cover need to be sealed tight after checking? I do not have a new gasket.
Is spark usually blue on these? I think mine is a little yellow.
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