GK76 Dyno Graphs

[maccas]

I think it's ok and not too far out at all. The 14 A/f mixture is the ideal figure if you're going for minimum hydrocarbons. You need to aim a little richer to increase engine response and lower engine temperatures, and maybe hp figures.
For 4t's I aim for 13/1 flat out, and 14 on cruise, and 12/1 on 2t's flat out.
The gsxr is a little wheezy in std form, and seems to suffer form a weak 'signal' at the carbs making them tricky to tune as you want them.
I've gone pod filters on mine, and mine goes super rich at 12-14000rpm but makes 55 at 12000 on the same dyno.

A larger main air jet would sort that out if you were looking to lean it off at the top?

Dan

[moforockband]

I think it's ok and not too far out at all. The 14 A/f mixture is the ideal figure if you're going for minimum hydrocarbons. You need to aim a little richer to increase engine response and lower engine temperatures, and maybe hp figures.
For 4t's I aim for 13/1 flat out, and 14 on cruise, and 12/1 on 2t's flat out.
The gsxr is a little wheezy in std form, and seems to suffer form a weak 'signal' at the carbs making them tricky to tune as you want them.
I've gone pod filters on mine, and mine goes super rich at 12-14000rpm but makes 55 at 12000 on the same dyno.

A larger main air jet would sort that out if you were looking to lean it off at the top?

Dan

Thanks Dan, will try that.

[martinsamuel]

Well, after many runs on the dyno (28 by the looks), different float heights, needle setup, jets,ultrasonic cleaning. This is what it's ended up like.



The really lean bit is sorted, it's just a shame that nothing seemed to sort that rich bit between 6 & 7. I'm assuming it must be something to do with the 4-1 headers with no balance pipes.

But, it's now definitely ready for some trackdays! Just need some nice weather now!

Martin

[moforockband]

Glad you got it sorted. Running a little rich is good for engine pickup on 100% throttle. When your bike is doing 100 mph the fuelling can be different from the dyno alightly also, due to the mad rush of air over the airbox.
Once I get mine sorted I'll take it out for a TD in Spring, can hook up if you'd like.
Once I get my 10-1 fuelling sorted haha!

[martinsamuel]

Sounds like a plan, keep me posted if you're booking one!

Martin

[Variablevalves suck]

get across to the classic bike TD at cadwell in the summer, loads of the forum get across, great weekend.

[moforockband]

Will be easy to spot the grey import crowd.... Carbs on the floor, spanners been chucked around