Stepping up on the rear sprocket will lower gas mileage, and increase torque. You would want to lower the rear sprocket tooth count, or increase the countershaft sprocket teeth to lower highway RPM and increase gas milage. Check out http://gearingcommander.com/ to play around with different settings. My knowledge of gearing comes from cars so I'll try to relate what I know of ratios to the type of vehicles, however it appears that bikes use one point down from cars so a 3.55 car ratio is equivalent to a 2.55 bike ratio. In cars the popular ratio for a luxury car with a big engine 2.73 or 3.08 ratio is common, a normal car would be 3.23 or 3.55 with the latter a little higher performance, a 3.73 or 3.91 would be good gearing for a street rod with the latter used on a small block car, these are also common truck gears as torque is prefered over gas milage, a 4.11 is the upper limit for use in street cars. So in comparison the night hawk has a stock gearing of 2.55 by droping the front sprocket to a 14 tooth you would increase the ratio to 2.71 which would probably be about right if you wanted more performance higher than that and you would suffer on the highway. Increasing the front sprocket to a 16 tooth would give you 2.37 or 17 tooth gives 2.23 both of which are in the realm of standard gearing. So if you wanted to increase mileage and lower your highway cruise RPM step up to a 16 or 17 tooth front sprocket most likely a 16 tooth would be barely noticeable and the 17 tooth would probably be the best of the two. Change the front sprocket rather than the back due to ease of replacement, and it will have less affect on the chain length.
On Feb 2, 9:47 pm, Mack Swanson <[email protected]> wrote: > My 1982 750 NH. always seemed to need one more gear when on the freeway. > I changed the sprockets went up to 40 teeth on the rear and it bumped my > milage > up to 50 mpg. > > ________________________________ > From: Allen Thomas <[email protected]> > To: Nightwawk Lovers <[email protected]> > Sent: Wed, February 2, 2011 8:40:56 PM > Subject: Re: [Nighthawk Lovers] GOT a Marjor question for the 1991-2003 > Honda750cc Nighthawk owners..... > > I get roughly 160 miles before I hit reserve. BTW I had fuel starvation issues > with a glass inline filter, it caused pinching of the fuel line and made it > die > on me from extended highway riding. The faster I rode the quicker it would > die. > 40 MPH and less it had no issues, 80 MPH and it would die in 5 minutes. > > Sent via BlackBerry by AT&T > ________________________________ > > From: The Florida Mt Biker <[email protected]> > Sender: [email protected] > Date: Wed, 2 Feb 2011 16:29:34 -0500 > To: <[email protected]> > ReplyTo: [email protected] > Subject: [Nighthawk Lovers] GOT a Marjor question for the 1991-2003 Honda > 750cc > Nighthawk owners..... > > I have read that 4.8 gallons tank. > > The bike gets between 35-47 mile per gallon. > > When does the reserve (low setting on the fuel) kick in???? > > I heard these bikes get 170 per tank. > > I am realizing that at about 80 to 120 miles it acts up. > > I put it on reserve, and get gas. > > Is this normal for this bike? or the new gas filler ( inside the tank) has > something to do with it. > > I rebuilt my petcock, I have a external clear gas filter to see the flow. > > It is getting gas greatly now. > > Thank you for your input so far. > > PS. My left hand controlls are lose any suggestions? > > I can not find the orginal dimensions for the OEM handle bars, I guess I have > to get raisers. > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/nighthawk_lovers?hl=en. > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/nighthawk_lovers?hl=en. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
