Quick Jetting Adjustment Question

[Guest]

For those who don't know the background, here is a review of my bike specs:

1980 GS850G
Stock Motor
K&N Pods
Mac 4-1
Dynojet Stage 3, installed as recommended, except with 160 mains instead of 165 mains.

At sea level, the mixture feels a tad rich, and stumbles right around 7,000 RPM right at about the 2/3-3/4 throttle mark. It will pull through this and pull pretty well down here. However, when it's HOT outside, or I'm up in the passes (3500ft+), the stumble gets worse and it continues from 7,000 RPM on with the throttle open past 2/3-3/4.

I don't think that the mains are overall rich enough to warrant dropping down a full jet-size to 155's, but obviously something needs to be done.

Does this sound like a case where the needles are set too rich, and I should I lower them down a notch, or maybe two, to lean out this portion of the circuit?

[BassCliff]

Hi,

What do your plug chops tell you? At 3/4 throttle you are still on the needle circuit. Where are your needles set?


Thank you for your indulgence,

BassCliff

[Suzuki_Don]

How much time do you spend in the mountains compared to being at sea level? This will dictate your settings.