Speedo healers?? high rpm's on highway.
06-11-2008, 10:14 AM
#1
Junior Member
Squid
Thread Starter
Join Date: Apr 2008
Posts: 15
Speedo healers?? high rpm's on highway.
i bought an 02 hawk this winter and the sprockets have been changed. it turns about 4500 rpm's on the highway at approx 70 -75 mph, and the nmileage is lousy (less than 25mpg) i dont know how many teeth on the spocket (haven't counted them up yet). i've read about speedo healers. are they hard to install? i'm also thinkin about changing to a less aggressive sprocket too. any thoughts on that? how many rpm's does a stock hawk turn on the highway at 70 mph? thanks, bob
06-11-2008, 10:20 AM
#2
Senior Member
SuperSport
Join Date: May 2008
Location: Central Fl.
Posts: 530
16t front, 41t rear. 4K rpm,@ 70 +/- in 6th. Check that your choke is completely disengaging after you start the bike when cold and have your carbs been balanced? The last mpg item is the tps, check that it's set to 4-6 ohms.
Gentle throttle control and a lubed chain got me as high as 44 mpg.
Gentle throttle control and a lubed chain got me as high as 44 mpg.
06-11-2008, 12:23 PM
#3
Fastest Color
SuperBike
Join Date: Jul 2007
Location: Lithia, FL
Posts: 2,091
i bought an 02 hawk this winter and the sprockets have been changed. it turns about 4500 rpm's on the highway at approx 70 -75 mph, and the nmileage is lousy (less than 25mpg) i dont know how many teeth on the spocket (haven't counted them up yet). i've read about speedo healers. are they hard to install? i'm also thinkin about changing to a less aggressive sprocket too. any thoughts on that? how many rpm's does a stock hawk turn on the highway at 70 mph? thanks, bob
http://www.speedohealer.com/eng/order.htm
Good luck bro!
RC
07-11-2008, 05:31 PM
#6
BeautyHawk
Squid
Join Date: Apr 2008
Location: Nebraska
Posts: 26
mine is doing worse, the PO put on a vortex setup, it runs about 5k rpm at 83mph(speedo reading) but the guys i ride with say we're doing 65mph... and my odometer is going crazy...
where did you get your speedo healer?
this is all i could find:
$$$$$
are there any cheaper?
where did you get your speedo healer?
this is all i could find:
$$$$$
are there any cheaper?
Last edited by kshuck2; 07-11-2008 at 06:26 PM.
07-11-2008, 08:35 PM
#8
Senior Member
MotoGP
Join Date: Aug 2007
Location: Way Out West
Posts: 2,547
If it could pull it the VTR with stock sprockets would redline (9500 rpm) at 169 mph in sixth gear.
To find rpm at 70 mph? 9500/169 =56.21 (rpm per each mph) times 70 (mph) =3935 rpm@ 70 mph.
Here's the formula;
(rpm X #front sprocket teeth X tire circumference in millimeters) divided by;
(primary gear ratio X sixth gear ratio X #rear sprocket teeth X 26,817)
nominal tire circumference for 180/55/17 is 1975 mm
Also, gear ratios are on pg. 204 of the owner's manual. If you don't have one, primary ratio is 1.681 and sixth gear is 0.961
Plugging the sprockets you have into the formula will give you actual sixth gear road speed at given engine rpm.
To find rpm at 70 mph? 9500/169 =56.21 (rpm per each mph) times 70 (mph) =3935 rpm@ 70 mph.
Here's the formula;
(rpm X #front sprocket teeth X tire circumference in millimeters) divided by;
(primary gear ratio X sixth gear ratio X #rear sprocket teeth X 26,817)
nominal tire circumference for 180/55/17 is 1975 mm
Also, gear ratios are on pg. 204 of the owner's manual. If you don't have one, primary ratio is 1.681 and sixth gear is 0.961
Plugging the sprockets you have into the formula will give you actual sixth gear road speed at given engine rpm.
Last edited by RK1; 07-11-2008 at 08:53 PM.
07-12-2008, 11:43 AM
#9
BeautyHawk
Squid
Join Date: Apr 2008
Location: Nebraska
Posts: 26
If it could pull it the VTR with stock sprockets would redline (9500 rpm) at 169 mph in sixth gear.
To find rpm at 70 mph? 9500/169 =56.21 (rpm per each mph) times 70 (mph) =3935 rpm@ 70 mph.
Here's the formula;
(rpm X #front sprocket teeth X tire circumference in millimeters) divided by;
(primary gear ratio X sixth gear ratio X #rear sprocket teeth X 26,817)
nominal tire circumference for 180/55/17 is 1975 mm
Also, gear ratios are on pg. 204 of the owner's manual. If you don't have one, primary ratio is 1.681 and sixth gear is 0.961
Plugging the sprockets you have into the formula will give you actual sixth gear road speed at given engine rpm.
To find rpm at 70 mph? 9500/169 =56.21 (rpm per each mph) times 70 (mph) =3935 rpm@ 70 mph.
Here's the formula;
(rpm X #front sprocket teeth X tire circumference in millimeters) divided by;
(primary gear ratio X sixth gear ratio X #rear sprocket teeth X 26,817)
nominal tire circumference for 180/55/17 is 1975 mm
Also, gear ratios are on pg. 204 of the owner's manual. If you don't have one, primary ratio is 1.681 and sixth gear is 0.961
Plugging the sprockets you have into the formula will give you actual sixth gear road speed at given engine rpm.
07-12-2008, 10:48 PM
#10
Senior Member
MotoGP
Join Date: Aug 2007
Location: Way Out West
Posts: 2,547
Ha! Has to be a decent calculator also, not one of those 8 digit cheap ones.
I use the one on my computer to determine rpm at given 6th gear cruise speed, percentage error from stock etc.
Then I use the one mounted between my ears to keep track of how fast I'm actually going.
I use the one on my computer to determine rpm at given 6th gear cruise speed, percentage error from stock etc.
Then I use the one mounted between my ears to keep track of how fast I'm actually going.
07-17-2008, 08:47 PM
#11
Senior Member
SuperSport
Join Date: Aug 2007
Location: Eagle, ID.
Posts: 599
Instead of spending $110 for the speedohealer, you can order a $15 bike computer and get the same results, http://www.ldrider.ca/techpages/bicyclecomputer.htm
The only thing it does not have is a light to read the speed at night.
The only thing it does not have is a light to read the speed at night.
07-17-2008, 09:18 PM
#12
Senior Member
Superstock
Join Date: Jun 2008
Posts: 255
Instead of spending $110 for the speedohealer, you can order a $15 bike computer and get the same results, http://www.ldrider.ca/techpages/bicyclecomputer.htm
The only thing it does not have is a light to read the speed at night.
The only thing it does not have is a light to read the speed at night.
07-17-2008, 09:45 PM
#13
Senior Member
SuperSport
Join Date: Nov 2007
Posts: 758
thats not too far off from what rpm's its supposed to be at around 70mph. a little high though. i just installed a speedohealer today, and its so easy it will blow your mind. i got version 4, its extremely easy to install, the hardest part is find a place to put it (very easy aslo). its also ver easy to program with the online calculator. its an awesome device.
07-20-2008, 10:47 PM
#14
BeautyHawk
Squid
Join Date: Apr 2008
Location: Nebraska
Posts: 26
Instead of spending $110 for the speedohealer, you can order a $15 bike computer and get the same results, http://www.ldrider.ca/techpages/bicyclecomputer.htm
The only thing it does not have is a light to read the speed at night.
The only thing it does not have is a light to read the speed at night.
this would work, but im mostly worried about the odometer for every 50 miles i ride it adds another 5 that never happened, so since i bought the bike, theres 220 miles that never happened, chalked up on the odo. ...
on the upside, it makes it look like im getting 45 mpg with it... haha
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