when they are flooded you have to open the throttle?
If it is flooded, opening the throttle would help clear the flood, and allow it to start easier. But if they are not flooded, opening the throttle would make it harder to start.
i'm i suppose to have the throttle (warming only) lever forward 1/3 while pressing on the choke (priming) then turn the the key to start ?
Only when starting the engine when it is completely cold. Such as the first time in a day.
no, what is vapor lock?
Vapor lock is what happens when fuel is left to sit resting on a hot engine. Think of the engine compartment as an oven. And the fuel in the carburetors fuel bowls as a pot of fuel sitting in that oven. What happens is eventually it begins to boil, and turns into vapor.
Watch this 3 part video, it does a good job of explaining it as well. Click these links below
Now if you are getting vapor lock there are 3 distinct things to do that will help.
1. Run non-ethanol fuel if you have it available in your area. Ethanol free fuel has a much higher boiling point.
2. Make sure the cooling system on the engine is serviced, and that the engine is not running any hotter than it needs to be.
3. Before you shut the engine off, let it idle for a minute or 2 first. This will help the engine cool down.
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