kolonial72
Well-known member
During a recent tech day, I adjusted my CO settings +7 in an attempt to smooth out the at-idle miss sound and 3400 rpm surging. Didn't quite do the trick. I wanted to add more to the settings, but the settings had been adjusted before, and I didn't know by how much.
A few months ago I took the bike to a shop for some tires. While it was there they installed a Barbarian jumper and did some tuning on a dyno. They made several adjustments to the CO settings. I had not asked for the information on how much they adusted, so I went back today to ask them.
Cylinder: 1 2 3 4
Stock: -2 20 7 16
Shop: -32 -10 -23 -14
Current: -25 -5 -16 -7
So, they took everything -30. That's minus thirty. I saw those and was like, wow. Maybe I'm running a little lean. Since the shop adjustment, I've gotten 38 to 40 mpg, which was my mileage before. And the peak horsepower on the dyno was 125.37, so that seems okay.
The trace of speed versus HP is fairly straight from the start to the peak, except in the range of 70 to 80 mph. That comes out to about 4000 on the low end and something less than 4500 rpm on the high end in 5th gear. In that range there is a bump on the curve. The curve ramps up quickly from 70 to 85 hp between 70 and 77 mph. Then the curve is almost but not quite level at 85 hp from 77 to 80 mph. The curve then behaves quite nicely.
Oh, also during the tech day, I trimmed the plug wires and cleaned corrosion off of the ECU connector under the tank. Neither of these actions seemed to have any effect on the miss/surge. Checked the throttle sync, still good.
I plan to change plugs this coming week. Not sure when they were changed last, but it's the first I've done it in the 4000 miles I've had the bike, which has 15k and change on the odo.
So here's my question. Is running the engine this lean going to be a problem, be it short term or long term? Based on the response, I may adjust the settings back to stock.
A few months ago I took the bike to a shop for some tires. While it was there they installed a Barbarian jumper and did some tuning on a dyno. They made several adjustments to the CO settings. I had not asked for the information on how much they adusted, so I went back today to ask them.
Cylinder: 1 2 3 4
Stock: -2 20 7 16
Shop: -32 -10 -23 -14
Current: -25 -5 -16 -7
So, they took everything -30. That's minus thirty. I saw those and was like, wow. Maybe I'm running a little lean. Since the shop adjustment, I've gotten 38 to 40 mpg, which was my mileage before. And the peak horsepower on the dyno was 125.37, so that seems okay.
The trace of speed versus HP is fairly straight from the start to the peak, except in the range of 70 to 80 mph. That comes out to about 4000 on the low end and something less than 4500 rpm on the high end in 5th gear. In that range there is a bump on the curve. The curve ramps up quickly from 70 to 85 hp between 70 and 77 mph. Then the curve is almost but not quite level at 85 hp from 77 to 80 mph. The curve then behaves quite nicely.
Oh, also during the tech day, I trimmed the plug wires and cleaned corrosion off of the ECU connector under the tank. Neither of these actions seemed to have any effect on the miss/surge. Checked the throttle sync, still good.
I plan to change plugs this coming week. Not sure when they were changed last, but it's the first I've done it in the 4000 miles I've had the bike, which has 15k and change on the odo.
So here's my question. Is running the engine this lean going to be a problem, be it short term or long term? Based on the response, I may adjust the settings back to stock.