.
So, we have all be talking about it.
Why do these bikes run so hot. And yes, a Large part of it is because they're making crazy high HP.
And by now some of us have just said.. "That's normal to run in the 200's"
Well, it may be normal for this bike...... But, it's NOT NORMAL.
Over the past 20 years we have collectively had about 30 bikes.
And NONE have run ever Averaged in the low 200's.
Well, this past weekend, we finally got around to installing the PCV and running the Auto Tune on the bike.
Come to find out, in stock trim our project bike was running 15.5 : 1 Air/fuel just about everywhere.
From Idle to about 80% TP.
That is crazy lean.
To put that in perspective, Dyno Jet shows OPTIMAL A/F Ratio = 13.2 - 13.5 : 1
So, we pulled a Stock Exhaust/ Stock Filter Map (M12-012-001) from Dyno Jet's map database... and Huge Majority of the Fuel Quadrants on the map had double digit increase in fuel. Some as high as 19 points.
We dropped in this map (M12-012-001) and went out and ran the bike for a few hours, and on average the Motor Temps dropped 15-20^.
Trying to be consistent we drove down the interstate at 60-70 mph.
Out Temp was 85-88^ and Sunny.
Before we put the map in the bike was running 195-205^
AFTER we put the map in it was running 175-184^
Of course, as soon as you we stopped at a light or stop sign the temps creep up to 205-210... because there is only the fan moving air across the radiator.
But, no matter where we rode, the Temps were always running cooler.
Surely common logic would dictate a cooler more effeciently running motor will LAST Longer. At least we would hope so.
![Image]()
.
So, we have all be talking about it.
Why do these bikes run so hot. And yes, a Large part of it is because they're making crazy high HP.
And by now some of us have just said.. "That's normal to run in the 200's"
Well, it may be normal for this bike...... But, it's NOT NORMAL.
Over the past 20 years we have collectively had about 30 bikes.
And NONE have run ever Averaged in the low 200's.
Well, this past weekend, we finally got around to installing the PCV and running the Auto Tune on the bike.
Come to find out, in stock trim our project bike was running 15.5 : 1 Air/fuel just about everywhere.
From Idle to about 80% TP.
That is crazy lean.
To put that in perspective, Dyno Jet shows OPTIMAL A/F Ratio = 13.2 - 13.5 : 1
So, we pulled a Stock Exhaust/ Stock Filter Map (M12-012-001) from Dyno Jet's map database... and Huge Majority of the Fuel Quadrants on the map had double digit increase in fuel. Some as high as 19 points.
We dropped in this map (M12-012-001) and went out and ran the bike for a few hours, and on average the Motor Temps dropped 15-20^.
Trying to be consistent we drove down the interstate at 60-70 mph.
Out Temp was 85-88^ and Sunny.
Before we put the map in the bike was running 195-205^
AFTER we put the map in it was running 175-184^
Of course, as soon as you we stopped at a light or stop sign the temps creep up to 205-210... because there is only the fan moving air across the radiator.
But, no matter where we rode, the Temps were always running cooler.
Surely common logic would dictate a cooler more effeciently running motor will LAST Longer. At least we would hope so.
.
