> Aaron Blair Wrote:
> You shouldn't need a battery for the bike to run. The magneto make
> electricity for spark on its own circuit separate from the battery. The
> battery is charged by a lighting coil to work the lights only....but
> that doesn't matter, you have spark so let's work on the problem at
> Dude, Its fuel. I'd bet money on it. That "duh. Duh. Duh duh" sound when
> you try to rev the bike is called four stroking. This only happens for
> one reason, too much fuel. If it still has its original carb and jets
> the only culprit could be that the choke is on. You need to check out
> that auto choke.
> Chokes work two ways, they either restrict air, with a valve that covers
> the mouth of the carb, there by decreasing the amount of air in the
> mixture. Or an extra jet that adds fuel. Point is that a choke enriches
> the fuel/air mix for easier starting.
> Usually a choke will open back up when you pull the throttle. But yours
> isn't doing that. It could be based off of temperature. But once again.
> It obviously isn't working.
> You have to pull apart the auto choke system or disable it.
Good points all around. I threw the battery back in it and started it up. The bike runs rich as you said because the choke is on. When cold this is fine, when warmed up the bike will idle, but runs lazy.
Today was the first time I have actually gotten to ride it down the street. I unhooked the vacuum line from the check valve that runs to the intake pipe. By doing this the bike runs actually fairly decent. It will at least pull me around at around 10-20 MPH.
Watch this video. I apply vacuum to a warmed up engine and it slowly bleeds off. I think the check valve or the BiMetal valve in the head is busted.