Bike only starts if Carburetor insulator nozzle is open
Hi
I had a Chinese 125cc ohv engine. It had some euro 2 standard device setup. There was an air pipe going from the carburetor intake manifold insulator to that euro 2 device.
I swapped the engine with a water cooled 200cc Ohv bit that engine doesn't have that euro setup.
Now if I use that pz27 carb with this 200cc engine it would only start of that nozzle on insulator is left open. If I close it engine will shut off. If it's closed and I try to start engine it won't start.
But if it's left open it's sucking air and mixing it with the air/fuel mixture already meter by carb won't that lean it? It might injest water or dirt.
It's that little black nozzle on the carb.
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Re: Bike only starts if Carburetor insulator nozzle is open
i guess that carb is simply too small for 200CC. Maybe try a PZ32 or even 34.
Re: Bike only starts if Carburetor insulator nozzle is open
you use a carb with too small cross section, additionally you give more fuel.
The logic for me is the bike gets too less air. Check your spark plug if its black and or wet.
Alternatively you can try to remove the air filter and test run it.
Or you can try run the bike with removed connection between airfilter and carb to suck more air in.
I have a small 125cc and when I open the choke fully it will die within short time after start.
Then I have to close the choke about half and it will run again.
The conclusion is that the relation Fuel to air is not correct. -> too much fuel
You have too less oxygen available to burn the fuel.