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TOPIC: 33-Tooth Pulley - Lower MPG? Forum Tools Post New Topic Show latest posts Rules

#111687 SobaCracka (User) It's best to eat crow while fresh. Platinum Boarder Posts: 1602 33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   I'm perplexed. I swapped out my stock 32-tooth pulley for a 33-tooth from a 1600 expecting to get better gas mileage (lower RPM at higher speed). So far, after two tanks, it looks like I'm getting even lower MPG. I haven't figured out the numbers, but my gas light came on at 167 miles today. I was going 174-181 miles previously before it lit up. What I'm thinking is that maybe I haven't adjusted to it yet and need to run her at higher rpms, so I'm not lugging and using more fuel to maintain or increase speed. I know it's almost at an idle in 5th gear at 70, which is better than it used to be. Any words of experience?   Logged     Earl in Catonsville, MD   The administrator has disabled public write access. #111691 PapaTom (User) Have Star - Will Travel Platinum Boarder Posts: 1440 Re:33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   Soba, do you find it takes more throttle to get up to speed from 1st? That could be where you might be dumping a bit more fuel. Just a guess.   Logged     FREE SPIRIT 2007 Silverado   The administrator has disabled public write access. #111717 CoachDan (User) I'm Mechanically Inclined, I Screw Up Everything. Gold Boarder Posts: 637 Re:33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   Hey Soba Your probably getting close to same mileage, if not a little better on highway. Your speedo and odometer are off now. A 31 tooth would make speedo speed up, a 33 should make it slow down. Or, is it the other way around.   Logged     CoachDans Bikes   The administrator has disabled public write access. #111730 PapaTom (User) Have Star - Will Travel Platinum Boarder Posts: 1440 Re:33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   Isn't the odo a separate circuit from the speedo?   Logged     FREE SPIRIT 2007 Silverado   The administrator has disabled public write access. #111761 rstarny (User) Junior Boarder Posts: 154 Re:33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   coachdan is right your spedo and odometer are off which will account for your odd numbers   Logged       The administrator has disabled public write access. #111832 SobaCracka (User) It's best to eat crow while fresh. Platinum Boarder Posts: 1602 Re:33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   CoachDan wrote: Hey Soba Your probably getting close to same mileage, if not a little better on highway. Your speedo and odometer are off now. A 31 tooth would make speedo speed up, a 33 should make it slow down. Or, is it the other way around. Hmmm, interesting thought. My guesstimate is that the 33-tooth will actually make my indicated speed closer to accurate. (I was right around 5% off, indicated 63 was 60 or so). I guess I should look into were the actual odometer measure is taken and see which way that gear would push it. I can handle it being about the same MPG, just not worse.At least the bike seems to work a bit less at 70-75 mph.   Logged     Earl in Catonsville, MD   The administrator has disabled public write access. #111846 PapaTom (User) Have Star - Will Travel Platinum Boarder Posts: 1440 Re:33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   It's late, so forgive me if I'm typing stupid. It seems to me if your pulley is now turning a bit slower the actual speed should be close or right on with the speedo. The speedo (and odo - CoachDan and rstarny were on the money) signal comes from the fifth gear pickup coil. If your pulley is more in line with the speed sensor, you should be dead on. I believe the odo was more accurate than the speedo, so I'm not sure at this point what affect the pulley might have on it (showing lower mileage than it should?). Since your scoot will be a bit slower coming off the line and getting up to speed, d'ya think you might be gunning it more than you used to?   Logged     Last Edit: 2008/08/24 00:27 By PapaTom.   FREE SPIRIT 2007 Silverado   The administrator has disabled public write access. #111852 SobaCracka (User) It's best to eat crow while fresh. Platinum Boarder Posts: 1602 Re:33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   PapaTom, It's possible I haven't made the adjustment in the way I throttle up. I also thought it would be closer to actual speed now. I'm going to ride it for a while and see if anything changes. Leaving for the New England trip this coming Thursday. Will have ample miles and fill-ups to help me gauge what's going on.   Logged     Earl in Catonsville, MD   The administrator has disabled public write access. #111857 Cougar (User) Platinum Boarder Posts: 2821 Re:33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   You might be interested in getting one of these and reading the information they supply....Coug Speedo Healer   Logged     Last Edit: 2008/08/24 07:51 By Cougar.     The administrator has disabled public write access. #111876 SPUDWRENCH12 (User) Junior Boarder Posts: 171 Re:33-Tooth Pulley - Lower MPG? 4 Months, 2 Weeks ago   THE LOWER THE TEETH ON THE GEAR THE MORE TOP END SPEED @ LOWER RPM'S .....SPUDWRENCH OUT   Logged     The administrator has disabled public write access.

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