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Jun 28, 2011 | 11:08 PM

Tonto1515

Thread Starter

Intermediate

Joined: Mar 2011

Posts: 29

Likes: 0

Rpm

I just bought a new 2011 Fat Bob in April and the speedometer does not come with a Tach. I was thinking of buying the 74723-10 or the 70900072 speedo/tach to replace the stock one. Two questions Anyone used either one of these and the second question is since this is my first Harley I do not know how tuff these bikes really are. What RPM would be considered to high on any occasion and what RPM is it OK to drive for long periods of time say when your in a 40 mph zone or even highway speed for that matter. I have already had my first 1000 mile service and did the full stage one upgrade.

Jun 28, 2011 | 11:18 PM

missedem

Outstanding HDF Member

Joined: Nov 2010

Posts: 2,250

Likes: 36

From: Montana

Ride the hell out of it. You are past the recommended break in period . I ride mine hard and it hasn't hurt it at all. In fact it seems the more you open it up the better it runs. If your worried about motor longevity just leave the stock rev limit alone and don't raise it to 6200 rpm. If you dont get on it once in awhile you will get carbon buildup in your heads. Just have fun and change the oil every 2500 - 5000 miles. I have always changed the oil every 2500 just because I want my motor to last. im sure it would be ok to run it like the manual says and just do it every 5000 but it is cheap insurance to change the oil a little more often. Ride safe.

Jun 28, 2011 | 11:20 PM

missedem

Outstanding HDF Member

Joined: Nov 2010

Posts: 2,250

Likes: 36

From: Montana

I dont have a tach. I just shift when the motor is happy and sounds like its ready to. I have had my bike on the hwy in 4th gear passing at 80 mph for more power and it is fine. Just shift up when you are done passing.

Jun 29, 2011 | 01:36 AM

DCLXVI

Road Warrior

Joined: Aug 2009

Posts: 1,630

Likes: 17

From: Central FL

I agree with these guys. A tach is ok if you want one but it's the same as putting one on my lawnmower. I just ride it and don't worry about it. The rev limited will keep you from over speeding the motor. These engines like to be reved. The more the they get the better they run.

Jun 29, 2011 | 04:10 AM

turbostang

Cruiser

Joined: Oct 2007

Posts: 228

Likes: 0

From: Avondale, AZ

I've put on the 70900070 and I love it. I've always felt if something has a manual transmission, it should have a tach.

Here's a thread about the new combo speedo/tach install

Jun 29, 2011 | 07:57 AM

Firenailer

Road Master

Joined: Oct 2010

Posts: 756

Likes: 133

From: Connecticut

I installed one and like it alot. Fairly cheap and easy to put in. I never had a bike without a tach and really missed it.

Jun 29, 2011 | 08:05 AM

KBFXDLI

Big Kahuna HDF Member

Joined: Feb 2006

Posts: 23,881

Likes: 34

From: USA

My Lowrider came with a tach. Your rev limiter is set at the factory at 5500 rpm. Normally the Stage 1 upgrade bumps it to 6200 but some tuners raise it to 6500 (which I do not recommend). So, ask your tuner what rpm he raised the rev limiter to. With a stage 1 kit the bike usually runs out the torque curve at about 5500 anyway. So, while a tach is not necessary, I really like one.