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Gas Mileage VS TPS setting

D

draidt

High Miler
GT Contributor
Joined
Sep 22, 2009
Messages
964
Location
Hernando, FL
Question of the day what effect on MPG will a TPS setting of 5.0 versus a normal setting of 4.7 have on mileage and whether the bike will be running richer or leaner ?

My Griso has been getting a MPG's in the low 30's and have been told by trialing riders that it smelled a little rich but no black smoke is ever emitted. Bike runs as good as ever but found the TPS setting at 5.0 via VDTS. I have the suspicion that the last time I did the TB balance I did not check the TPS setting after balancing the high speed adjustment screw. At that time I also put on a Mistral can with the baffle left in. Their is no popping on trailing throttle even if I try and induce it. If anything I would have thought that a freer flow exhaust would have leaned it out a bit. Air filter and box is untouched. So going back to the TPS setting would that be the reason.

I do not mind the gas mileage as a richer exhaust means a cooler running motor.
 
Hi Draidt
On my Breva 1100 i have set my TPS from 4.7to 6.7 and I get 5.1Lit/100Km, I havent noticed a change in fuel consumption. I have no popping and the engine definitely runs a lot cooler. I posted a while ago how i set it, I hasten to add it was not my idea. The only difference I notice is starting from cold , the tick over is a little low at 900-1000RPM for about 1 min untill the engine warms up a little , i just hold the throttle open a little then it settles down at 1100RPM and runs fine,
cheers Kevin
 
A higher than normal TPS setting will give a richer setting, all other things being equal. Consumption in the low 30 mpg sounds a little excessive to me, but could be due to several reasons.

1. Faulty or isolated temperature sensor on the RH jug.
2. Binding brakes
3. Excessive use of throttle. :twisted:

I've never ridden in Florida (got close last year when I rode from Tybee Beach, Savannah in Georgia to Marina Del Rey in California), but I understand that you don't have any hills, Dan. Surely you should be getting better mileage than this.
 
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