a/f screw

[wismo]

Just wondering how a pre would run If a/f screw is adjusted to 2.75 turns instead of 2.5 turns out.
Will that have any effect in the higher rpm range (5000 to 7000) rpms.
Its possible when i set mine i could have mistook 2.75 for 2.5.

[RossW]

not high range, but it will certainly affect idle and low range. I put my screws to 2.75 when I cleaned my carbs and I'm actually just about to go take the carbs off again and reset them to 2.5

[Kreylyn]

Just wondering how a pre would run If a/f screw is adjusted to 2.75 turns instead of 2.5 turns out.
Will that have any effect in the higher rpm range (5000 to 7000) rpms.
Its possible when i set mine i could have mistook 2.75 for 2.5.

In general it will idle/run a little rich in the lower rpms if your bike is mostly stock. Symptoms would be bike starts cold with no choke... idles a little rough when warm, might load up at low rpm take offs, etc... How severe the problems are will be a little different for every bike.

Optimally, setting at 2.5 as a starting point, then adjusting them individually when running to get the specific best setting for each carb would be the way to go.

Krey

[cleankat96]

The shop that fine tuned my bike to get it to pass emissions and run properly said they were all at about 2.75 give or take a little(my bike is completely stock) -ATM-

[kevin2502000]

The shop that fine tuned my bike to get it to pass emissions and run properly said they were all at about 2.75 give or take a little(my bike is completely stock) -ATM-

Really? I would think richening it would make it worse for the emissions tests........

[RossW]

+1

For emissions you should be running slightly lean. I run 2.75 with a full yoshi and it runs rich. If you're running 2.75 on a stock bike you need to clean your carbs.

[strn365]

yep im with kevin on that one unburned hydrocarbons would be bad for emmissions test i would think

[steves]

Each bike will be different.