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Re: [St] push start



At 10:11 AM 4/12/2008, you wrote:

>Dan Wetherington wrote:
>
> > No, Paul, sorry.  The "bump" refers to bumping the engine 
> over...  Your down hill start is the same thing, just using gravity 
> instead of  pushing.  I've always called it push-starting, 
> personally.  My routine (with my old EX500, funnily enough) was to 
> put the bike in second, sprint alongside it with the clutch pulled 
> in, jump on and pop the clutch.  I found that I needed to be 
> sitting on the bike or the rear would just lock up.  Granted, that 
> bike weighed 400lbs wet, and didn't have a fancy computer or fuel injection...<
>
>I always thought the "bump" in bump start was derived from the bump 
>on the seat
>you want to do with your weight as you drop the clutch to keep give 
>the rear a
>little more traction to work with...no?

Well you do need the weight on the rear to maintain traction and keep 
the tire/chain/transmission all turning as you suddenly connect all 
that to the crankshaft of the motor, expecting all that mass and 
momentum to over come the flywheel mass and compression.
But the phrase "bump it over" is also used to describe barely 
rotating the motor when checking camshaft timing (and some other 
maintenance procedures).
There you don't want to crank the motor through a full cycle(s), you 
just want to nudge it a bit (rotating it a few degrees).



JohnS
A Dragon Ascending
"Forging my body in the Fires of my Will"

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