Might be a stupid question, but how do you know wheather you have an "A" or "B" motor.

2010 FLHX Streedglide..............

Thanks..................

 

All Twin Cam touring models are unofficially called A motors and are not counterbalanced. All Twin Cam Softails are B motors and are counterbalanced.

 

All Dyna chassis have the A motor and all soft tail models have the B motor.

 

If it's not a Softail it's not a B motor.

 

What they said. You have an "A motor", why do you care?

 

B motors do not shake like an a motor will. They are smooth as silk.

 

Only at idle

 

I am confused does mine shakrr

 

I have always wondered why they dont just balance them all??

 

Do not get the TC and the TCb (note little b) confused as to what the TC stands for. Both are similar with twin cam shafts for the valves. The difference lies in the TCb is only in the Softail solid mounted engine and has a chain set up with twin balance rotors to balance the engine at idle. The second attachment is the balance rotors, the housing they run in and the drivechain and tensioners that run in the base of the engine. The Softail TCb engines are for those who want to limit the vibes to the bedroom....