Dumb Question?

Here goes...crank, crank...crank.:blink: What is the best way to assure the quickest start, while cranking an engine with BS34 carburetors?
Sometimes it takes an awful lot of cranking before it starts, if it doesn't fire up right-away.

Use the choke. Lean is mean. :evil:
Steve

swest wrote: Use the choke. Lean is mean. :evil:
Steve

When cold...yes. :whistle: But my difficulty is usually after turning the engine off after a ride, and then attempting to start it a short time later, while the motor is still warm.
A friend suggested goosing it a little when turning off the key, to put some extra gas in the cylinder to assist the next start.

daveo wrote:

swest wrote: Use the choke. Lean is mean. :evil:
Steve

When cold...yes. :whistle: But my difficulty is usually after turning the engine off after a ride, and then attempting to start it a short time later, while the motor is still warm.
A friend suggested goosing it a little when turning off the key, to put some extra gas in the cylinder to assist the next start.

how much fuel mixture do you expect will be in a one through four cylinder engine after 720° rotation while shutting it down?

missionkz wrote:

daveo wrote:

swest wrote: Use the choke. Lean is mean. :evil:
Steve

When cold...yes. :whistle: But my difficulty is usually after turning the engine off after a ride, and then attempting to start it a short time later, while the motor is still warm.
A friend suggested goosing it a little when turning off the key, to put some extra gas in the cylinder to assist the next start.

how much fuel mixture do you expect will be in a one through four cylinder engine after 720° rotation while shutting it down?

Good question...
I realize the whole system is mechanical, but don't understand how it gets the initial fuel shot to start, since there is no fuel pump.
Rotating the throttle before pressing the start switch does nothing, except to open/close the butterfly valves behind the slides...

The vacuum caused by the intake stroke of the cylinders sucks the air/fuel mix in. Unlike fuel injection no fuel pump is needed to squirt fuel in. Ed

650ed wrote: The vacuum caused by the intake stroke of the cylinders sucks the air/fuel mix in. Unlike fuel injection no fuel pump is needed to squirt fuel in. Ed

I can't believe I'm asking about this :lol: , but...how much and when is the best time to twist the throttle to open the butterfly valves? If I just crank it without touching the throttle, it just crank, crank...cranks. :pinch:

Plug pics.
Steve

swest wrote: Plug pics.
Steve

Taken in April, after the top-end redo... :woohoo:

Pic of the bike?
Steve

When starting the bike don't touch the throttle until it fires up. Ed

swest wrote: Pic of the bike?
Steve

The header has blued a lot since pic was taken in April, apparently due to the head/cam change.