I don't have any problems starting my bike. I just pull the choke, give a little twist to the throttle, then hit the start button. Easy.

 

Correct me if I'm wrong but, on a stock bike, ie no pumper carb, twisting the throttle with the engine not running does nothing. All you are doing is opening and closing a butterfly valve, which has no effect on fuel or air, unless the motor is running, in which case you are metering the airflow which will raise the slide and draw fuel from the float bowl. Now when my bike is warmed up I typically have to have the throttle slightly open for it to fire up, I don't know why for sure but I'm guessing its the mixture isn't spot on for it to fire with the butterfly closed.


Unless of course, what we are noticing is a hanging float, and then maybe the slight tapping from the butterfly snapping shut frees it up allowing fresh fuel into the bowl etc etc etc.

 

Since it started getting colder out the last month or so I have been shutting the fuel off and I think it helps but I also think cold oil has something to do with it.I also noticed that the bike will start easier when it's warmed up if I give it a little throttle.Maybe I will try the new sparkplug theory and see what happens.

 

You, sir, are correct!

 

Interesting idea also. When the bike is not running or trying to start, twisting the throttle will not draw fuel from your tank and into the carb as it is an action of the carb sucking fuel. The question would be, does it draw fuel from your carb into the combustion chamber or is it simply opening up the butterfly more and letting more air inside? Maybe what happens is that there is too much gasoline vapor inside of the carb and doesn't let it start for some reason, but either when it is drained or it is mixed with enough air from the airbox would it then start properly. Hmmmm.

When I'm out at his house tomorrow we will try to crack the throttle a few times to see if it has some effect on starting, that is of course if he hasn't ridden it for some time.

 

If the throttle is open, and the starter is cranking, gas is getting in there, pumper carb or not.

 

Yes, surely if the engine is running or you are thumbing the starter, fuel is flowing.

The question would be, is it gasoline vapor causing some kind of problem to where draining the carb by either manual or letting it run dry reduces the vapor and lets it start easy? If so, possibly cracking the throttle open and closed a few times before trying to start it might let some of the gasoline vapor mix with air from the airbox thusly reducing the ammount of vapor and letting the bike start more easially?

 

Trust me I have tried every combination known to man. For me twisting the throttle does nothing, and in fact will actually keep the bike fromfiring in certain situations. I have also discovered that after an hour or less I can restart the bike without using the choke again. It may be one of life's mysteries that we will never figure out, but it is fun trying. Keep the discussion going, this is great. We will figure it out eventually.[sm=icon_rock.gif]

edited because there was an extra space between two words. See how sick I am?[8D]

 

I'm in Florida so the coldest I've started my bike so far is 60 degrees. It's 80 today. Maybe when I try to start it when its colder I might have a problem. We'll see.

 

My bike fires up easily every time, full choke hit the start button and within 2 seconds bango!
I don't touch the throttle and to shut down I just turn the key off and leave the fuel petock ON.
I can let is sit for days and the temperature doesn't matter (so far from 34F to over 100F degrees).
It was like this from day one and none of the mod's that I did to it effected the bikes starting.