Piston Firing

poppahoss

Hey folks, I would like to know on a 295 4 cycle robin engine (1993) does both pistons fire at the same time as they both come to the top together or does one fire and then the other on the next time up?

BGW

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trig123

Both at same time

poppahoss

so you can,t cross the plug wires, right.

poppahoss

also does it fire at top dead center or before or after?
just trying to get a handle on this thing.

StoveBolt

That's what I'm saying, they come up and down together but while one is on the compression stoke the other is on
the exhaust stoke, that's why they are so smooth compared to the Kaw one cylinders.

poppahoss

I thought in order for them to fire separately there would have to be a distributor to direct the fire.

StoveBolt

Here's a 295 cam, if both cylinders fired at the same time the 2 lobes on the left operating the valves would be in the same direction as the 2 on the right... see how they are 180 opposite direction? The cam spins half the speed as the crank = 4 stokes.

poppahoss

OK thank you stovebolt and trig123. trying to determine if this thing has jumped time without pulling the engine, anyway thanks guys.

CP241

You can snake the timing belt cover off of the motor and check the timing marks without removing the engine. it's a tight fit, but i've done it.

If they're off, you may be able to loosen the tensioner and reset the belt. Otherwise to replace the timing belt, the motor has to come out as you're not going to get the drive clutch off without pulling the motor.

poppahoss

thank you cp241