FZRSupport: the FZROnline Archive

1990 non-EXUP FZR400 Bone Stock -
..as you can see things to to hell after 10k
Posted this on the archives site as well.

is that 50.17 power and 25.54 lbs of torque?

Mine is around here somewhere.......

how the hell do you understand these dyno run sheets? im lost

fzrwayne wrote:how the hell do you understand these dyno run sheets? im lost

Ask ur father

load_it_up wrote:1990 non-EXUP FZR400 Bone Stock -
..as you can see things to to hell after 10k
Posted this on the archives site as well.

This 1 the fuel mixture was too rich over 10,000rpm. Miss firing can cause this. Its not a job for a novice really. If you look at the bottom scale with the blue line this is your fuel air ratio the idea of using dyno runs is to set your jetting to maintain as near as possible to a ratio of 13 parts of air to 1 part of fuel all the way thro the rev range. This is calculated by a probe stuffed up your exhaust it measures Co2 levels. If Co2 levels are high this means that theres unburnt fuel hence too much being fed to the cylinder. Raising the C clip on the needle will give a minor adjustment if this is not enough then the jets must be replaced with smaller size. Most dyno runs are priced at per hour but be vigilant on who you let run your bike on a dyno as from experience if the guy dnt know how to use it proper or dont give a shit about your bike he can blow your engine. Having had my 1260cc drag race engine blown on a dyno due to a miss fire @ 7,500 rpm OUCH :tard2: