Bad Running 900

[fixitsan]

Hi Guys

 

Just checked my co2 readings, engine cold, C1 25 & C2 11. Played with them, but didnt seem to make any difference.

 

Have set them both to 10 will take it for a spin and see if feels any different.

 

Should i readjust once warmed up?

 

Cheers

 

Doggy

 

I think if it makes no change and doesn't help you to find the problem then set them back to 25 and 11.

 

The adjustment is designed to fine tune the open loop low speed/low load mixture. When the throttle bodies are made they have slight differences due to manufacturing tolerances, not to mention, that in the airbox each throttle body has a different length rubber snorkel .

I would be surprised if under those conditions many bikes left the factory with both settings at the same value, due to the inherent differences between intakes, of each cylinder.

 

The better approach, imho, is where there is a difference between them to start off with, keep the difference the same by increasing both, or decreasing both, by  the same amount.

 

By all means adjust them, I find I got a smoother idle by increasing them both, but retain the units of difference to keep them balanced.

 

If it hasn't fixed the problem, anyway, I would go on to rechecking the ignition system again as mentioned above, but check the simple stuff too, such as vacuum hoses coming off the manifold. The vacuum pipe to the airbox flap is a good place to get a vacuum leak too