Just got my bike dynoed.
 

And got 51.9hp @ 5863rpm and 67.9m.N @ 4601,the mechanic reckons that there are about two more neddies in there if I richen it up a bit,the fuelling is at 18 and he said that 14 was optimum.

It was a free dyno day at the local Kawasaki dealer,they did about thirty Kawasakis,mine was the only interloper,many were impressed by the torque and the bike in general.

http://aycu35.webshots.com/image/446...7002579_fs.jpg

http://aycu17.webshots.com/image/450...8203233_fs.jpg

Very nice results. Your fuel/Air ratio is to lean & needs to be richer to get more power, 13:1 is the best for top end power.

How do I do that?

send your map to Kev, Kev will modify it and send it back to you, all you have to do is reload the new map. :bling:

I don't have a map,I have the Kev mod and the filter set and the obligatory Staintunes.

The tech guy said mine was to lean?!!!!!

[confused]

Sorry zzzak, I don't know what I was thinking :100::eusa_wall::whip2::catfight:, you are quite correct. It needs to be made richer not leaner. I have corrected my reply.

Turn up the fuel mod clockwise to lower the temp sender reading, by a futher 5 degrees.

I see, said he blind man, I assumed you had a pcIII and then went to have it dynoed... then do as the Wizard suggested :drool[1]:

Thanks Kev.

just be very careful when you take the Air fuel ratio some dynos give you.

Can you describe the A/F ratio probe these guys used to measure the exhaust gas?

Normally, over here by me, you get the dynojet type that uses a thin copper tube that is inserted about 800mm or deeper into the exhaust and it is connected to a vacuum pump and filter. The exhaust gas is then sucked out of the header pipe and sampled.

The other guys here uses a normal A/F ratio meter with a lambda probe that is connected to a short tube and this tube is stuck into the back of the silencer with the O2 sensor sticking out on the side. You can actually see the tip of the sensor if you look down the tube.

The problem with the last setup is that the lamda sensor detects oxygen and to get a good reading you have to prevent the sensor from detecting fresh clean air. Hanging it at the back of the exhaust means jack and it will give you false readings. It will make the sensor read way leaner that what it actually reads

For the life of me, I cannot see how a XT660 will run so smoothly on the dyno when it is running as lean as 18:1. Usually if you hit around 15:1 A/F ratio the power output starts dropping off and around 16:1 the bike will start producing erratic power curves with spikes and dips all over the place.

You must sample the exhaust gas from the header pipe, not the back of the silencer, or the results are bogus. Even a small leak in the exhaust pipe can throw the lamda sensor way off.