Put -1, +2 on my 2004; what happened?

I bought, from Sprocketcenter, a DID chain and -1 on the front and +2 on the rear. After our snow storm, today was the first ride to work. She has the pep, but she sings a little more once you hit your speed limit. My question is : did this effect my mph reading (if so how much); did this effect my mileage reading (ex: 25 miles to work instead of 20 miles)? Can anyone help my with these answers? This morning at 75 mph I was getting passed. Thanks in advance!!:thumbsup:

 

Yes, it will affect both. I would hook up a gps to see how far off you are then go and buy a speedo healer to correct your mph reading.

 

In my experience changing the front 1 tooth will change your speed about 5-7%, so I imagine changing ratios the way you did will raise your indicated speed about 10-11% from original readings which are already 7-10% fast. That would be a WAG on my part. Your odometer will be off too since it most likely was pretty accurate to begin with, unlike the speedometer. Since you have increased the revolutions of your countershaft sprocket in relation to road speed, your speedometer/odometer will read fast since they take their readings from the counter shaft sprocket nut.

You can check your odometer by the highway mileage signs, I usually average it over 10-20 miles. I run a bicycle computer on my bike so I know what my real speed is.

You could find a LEO and do some high speed passes and see if your speed matches what he puts on the ticket. LOL

 

Totally agree.:thumbsup:

 

Hey cowboy - I did the same to my 02 last year. -1 +2 with a DID chain. It does give it more pep. Front end will be much lighter now, so watch it pushing out of the corners on twisties.

I borrowed my neighbors GPS, bought a speedohealer V4.0, and found that my 02 was off by 17.2 %. Plugged the numbers into the speedohealer and now she is spot on mph. I talked to a friend from high school who is now a cop, and he said that you can actually request them to use their radar to recalibrate your speedo too if you don't have access to a GPS. They will just go with you onto an open road or empty parking lot till you have it figured out.

 

agree... went -1/+2 and saw (at least) a 12% difference

 

has any one gone just +2 on rear? isn't -1 on front like going+2.7 on rear sprocket.
I was thinking of just going + 2 on rear and staying stock on front

 

+2 on the rear.

I got +2 on the rear, for over a year now and the bike runs pretty good. The front end goes up if you want to and of course you go thru the gears a little fast. I've try -1 front, but +2 on the rear fill better for me.

 

Good info here guys, I'm looking to do the same most likely; go +2 on the back.

To save me some research time (hey I'm at work! ), what does the +2 amount to (total teeth count) and can you recommend a brand and/or place to buy from?

Finally for those that have just gone +2 in the back, do you know how that has affected your mph and mileage readings?

Thanks!

 

gearing commander has your answer...

Gearing Commander: Motorcycle Gearing Ratio Sprocket RPM Speed Chain Calculator

most bikes are in the DB as far as stock ratios/teeth counts and RPM/MPH conversions

 

+ 2 on the rear

www.sproketcenter.com - Look for the stealth tri-metal $89.95
stock ratio: 2.69
-1 front: 2.86
+2 rear: 2.81
mpg goes down a little be, but all depends of you drive.

 

Hey Marcosdm, Just wondering what differences you noticed between a -1 set up vs. a +2 rear. I've always done the -1 and never tried the other, And I'm getting ready for new sprockets, so wondering if I shouldn't try the +2.

Thanks

 

+ 2 on the rear

-1 front it's just too short for a VFR, you run out of gears very fast, and +2 on the rear gives you a little room. Good in the city and just ok for short trips.

 

I went -1/+2 on my 5th gen and just measured it today with the GPS, 70mph on the GPS was an indicated 83-84mph on the speedo. Guess it's time to get a speedo healer. BTW, revs at 70mph were around 5700, a little higher, I kept reaching for another gear, takes some getting used to.

 

ahhhhh.... the mythical 7th gear.


BTDT.

 

Hey Stuka, would you let me know when you receive and insatll your healer.

I'm wanting to get one myself, but have no familiarity with the unit. Cost, brand, install procedure, etc.

Thanks brother!

 

Speedo Healer Website

Price is around ~$100 IIRC and the website has some how-to install guides from customers.

5th Gen Install Guide

6th Gen Install Guide

 

That's pretty slick disguising your NOS tank as WD40. How extra ponies that making for ya? :biggrin::biggrin::biggrin: