first ironhead,need help
-71 is tricky, has clutch changed from dry to wet ? If it has changed use Sportster transmission fluid.
Factory service manual OEM#99484-75 ( from 70-75) also parts catalog OEM#99451-78 (57->78) is good to have. These are newest prints.
If you search for oil debate you will find so much info, well, if you read it all it will be interesting, but you will have no time left to ride. Anyway, the two top choices i think are either the 20W50 alrady recommended or the straight 50 [or 60 in very hot places]. Whatever, synth or dino, just change it reasonably often.
Lucky you to have found one that has been treated well.
Welcome to the world of IronHeads!!
Last edited by IronMick; Aug 20, 2009 at 05:53 AM. Reason: Included oil opinion.
In 1971, the first year to use the new wet clutch, and your machine has the wet clutch.
The oil for the primary and trans must be the same as used in the engine.
There is a transfer valve that moves a small amount of oil from the crankcase side over to the primary, and these oils mix.
As for what is the best oil to use in a 1971 engine........Harley Davidson 60wt, if you can get it at your closest HD dealer.
Myself, that is all I use in my 1971 XLCH and I have owned this bike for 36 years .During that time, I have had to repair a few things from time to time, so I can say I know a little bit about these machines.
Central Texas? Definitely use 60wt. Do not use the multiple weight oils for this old Sportster! Newer Sporties can run it but they are much different machines than a 1971.
Also, newer Sporties can and do use automatic transmission fluid, but NOT on your model.
A service manual is going to tell you all of this stuff. Just follow what the manual says.
And last, an XLCH of 1971 always had a kickstatrter. None that I remember came with an electric starter, or offered that as an option.
Back in 1971 if you wanted an electric start, themn you bought an XLH, not an XLCH.
To install an electric starter on a CH is almost an impossibile undertaking if money means anything to you
You would need many, many parts, a new oil tank, a new and larger battery, yada, yada,yada, the list is long.
So this should prompt you to take a good look at your engine serial number.
The number will start with a number, and be followed by a letter.
So, if your engine number starts with...........4A, then you have a CH.
If your number starts with .............................3A then you have an XLH Good luck with your bike............. pg
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I just double checked my 1971 owners manual to make sure I was not telling you something incorrectly.
The wiring diagrams show electrical starter on an XLH and none on the XLCH. So I remember correctly. Been a long time ago.
Here is a diagram of what is involved in kick starter parts, should you decide to take on the installation as a project one day.

You can no longer buy these parts from Harley Davidson, so what is available is made in Asia items. Famous for their poor fit and finish.
Also, there are a few issues with a kick starter that make it somewhat less desirable as you get older. Called Hyper Extended Knee, I believe. I have had this condition more times than I care to remember, and it is not a fun way to spend your idle time!
Additionally, if you want to put the bike back as it came off the showroom floor, you will need:
To remove all of the electric starter, wiring, start button, start relay, solenoid, big battery and mount tray, side mount oil tank and a number of other small items.
Then you will need to find and install:
Small battery mounted on the left side
Center mount oil tank
The mechanical kick start items shown in the diagram
A plate to block off where the starter used to be on the primary backside, and a number of other small items.
My suggestion is to forget this idea and just enjoy riding the machine.
You will not be getting the Hyper Extended Knee with a push button starter either.
The trade off is.......... today it is pretty cool to see a rider who's only way of starting his scooter is a kick lever on the side. When is the last time you saw that?
Enjoy the bike, and post a couple of pics for us to look at............ pg
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