You hold the throttle wide open so the most amount of air get into the cylinder instead of leaving the carb slide down and choking off the air flow.[thumb]tshack420 said:you should do it with the engine warm, but if it wont run for whatever reason then cold will give you a good enough reading. warm will generally give you a little higher reading then cold. pull until it stops going up, shouldnt take more then 4-5 pulls usually. some people will say to hold the throttle wide open, not sure of the reasoning behind that but i never do.[/color=red] 120 psi or better would be what you want, anything less then 100 and its time to start thinking about a rebuild..all cylinders should be within 10 psi of eachother..
good to know.Ugly_old_Poo_kid said:^^^ What he said...
Pull the rope till the gauge stops moving up.
Oh, and to put the question to bed about whether or not to hold the throttle...
YES!!!! You want the throttle wide open. I tested this myself a couple weeks ago, and had large difference with the throttle open vs closed.. (higher being open obviously)
Just for grins on my 800, I checked by hand, by starter, and with the throttle closed/open:
By hand throttle closed = 130psi
By hand throttle open = 140psi
By electric starter throttle closed = 140psi
By electric starter throttle open = 150psi
I'll have to correct your opinion...bigwedgies said:wow so many opinions on this i might as well give mine.
yes plugs out throttle open, throttle open alows most air to come in quickly, wont get a higher reading by not opening throttle will just take more pulls.