Tried finding the answer on here and at the stealer ship, got no wheres on my own so can anyone give me a scoop. Whats the difference between 88 and 88b if they are both carburated? The question came to me once i aquired a Screaming Eagle Ignition Module (31793-04) it say it has a RPM limit of 6200, second question whats the normal (safe limit)? dont have a tach on it as of now. Thanks

 

88b's are balanced using weights and have reduced engine vibration.

 

The Twin Cam wasn't initially used in the Softail model family before the year 2000. This was due to the chassis design and vibration transfer to the Softail frame as a result of the direct (hard) mounting of the engine. Dyna models are "rubber mounted", damping the majority of vibration transfer to the frame and rider. Harley solved the issue for the Softail family by designing an engine variant known as Twin Cam 88B. It is basically the same engine as the original (now called "Twin Cam 88A"), but with a modified engine block design that incorporates twin chain-driven counter-balancers. This caused some controversy among Harley veterans, claiming that the "Harley vibes" were a part of their motorcycles.[citation needed] The Twin Cam 96B engine was released at the same time as the Twin Cam 96A model, for the 2007 model year, and is currently used on all Softail models.

 

SO am I safe in assuming that the 2004 Springer I have has the 88b, or am i likely running a 88"A" can this be claraffied by the VIN (if so what am I looking for verse the straight older 88's) Or can I tell from a certain by looking at a specific part of the motor? Sorry for the lack of knowledge on my end, as soon as I think I got stuff sorted out I relize how little i know.

 

If is a twin cam softail it has the B model engine in it.

 

B motor front engine mounts first pic

A Motor front engine mounts second pic

 

Thanks for that, and last question to this thread, once again tried to find the answer and got 4 different ones, what the max (stock) RPM safely? Thanks

 

I believe max RPM is at 6200.

 

TC 88 B is rigid mount tc 88a is rubber mount

 

I think the revlimiter is set less than this from the factory. 5500, maybe Since the power curve is on the decline by this point, I never saw a point in going higher.

If 2000-2006, and you can't see your shocks, you got 88B