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  #1  
Old 3rd April 2010
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billeuze billeuze is offline
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Default Cam follower conversion, or not...

Before I do this I want to know if it is really necessary.

The issue is I am moving the shifter mechanism from my old ’85 engine to the new ‘80 cases and Trock trap door. The shifter mechanism in the ’85 is just like any other ironhead, except, I found out, for the cam follower. The 85 has a double ended support which doesn’t bolt right in to my new trap door which is setup for a single support cam follower. Here’s the ’85 trap door setup:



The 52 – 84 single cam follower that will directly bolt in to my new trap door is available but I don’t know if it will work with my ’85 cam plate (and I don’t want to buy an older style cam plate as it is $233). So, anyone with a 75- early 84 shifter available to look at right now, can you tell me if it is the same as my 85?. I mainly wonder if the single cam follower has the same triangle shape on the end as mine, if not, I'd be worried that the cam plate is not shaped the same with the same triangle shaped stops. Here’s mine with the cam follower held against it:



The reason I suspect it may be the same though is the part number. Older cam followers are number 34012-75 with description: "shifter cam, only” and the ’85 is 34012-75A with description: “shifter cam, with shaft”

If it looks like this cam plate won’t work with the single support cam followers then it shouldn’t be too much of a problem to machine my Trock door to adapt this double support cam follower. It almost fits as is but a little meat would have to be taken out of the trap door directly under the center of the cam follower and then where the 2 springs sit would have to be machined down to .225 thickness. Here’s where it almost fits:



Now I imagine that the bit of machining required wouldn’t really hurt the integrity of the trap door, but rather than risking weakening the door, if the old style single support system work’s alright I’d rather just bolt it in. Unless of course the newer dual support system is a lot better. Does anyone know? I imagine they modified it for a reason.


To summarize, my 2 questions are:

-1) Is the 75-84 cam plate any different than the late 84-85 version
-2) is the newer dual support version better and worth machining the trap door to fit.
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  #2  
Old 4th April 2010
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Bump.

Anyone?
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Old 4th April 2010
Jafa39 Jafa39 is offline
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I would try comparing shifter plate part numbers as if they are the same then the follower will work on either....
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Old 4th April 2010
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Hi Billeuze,

The earlier cam plate has a dedent for the neutral position while the late 84 one has a flat there due to new design... So you can't use that early design on late 84 and 85 Sportster as the neutral position won't be located properly. The late design allows for no dedent as the cam is held in neutral by the deep sides on the twin spring locator.

The twin spring locator was necessary to give clearance on the other side for the mounting of the new alternator stator behind the clutch.

I haven't seen the other side of your Trock door so can't be sure, but I'd rather think it's got no provision to fit the stator.

You are probably stuck with using the L84 OEM H-D trap door on this one...

Patrick
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Old 4th April 2010
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Thanks Patrick, that's what I needed to know.

I would have thought, if the part is that much different, that they would give it a -84 part number rather than -75A.

This is going into a 1980 engine so the trap door I have is the right one. I'm just robbing as many parts as I can from my old '85 to put this one together.
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Old 4th April 2010
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OK, Billeuze,

So you'll just need to locate an early single bolt cum single spring locator and a cam plate with indent on neutral. Earlier cam plates are probably better anyway since they are machined, not stamped...

If it was me and my job, I would probably have a go at modding the trap door, but since it's yours and expensive, I can't vouch for your machinist and his skills, so will abstain from telling you to do it, too much could go wrong in the process!!!

Patrick
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Old 17th April 2010
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Well I went and got my trap door machined for the dual support cam follower. In the end though I'm not sure it was necessary. It looks as if the 1985 cam plate is actually the same as the earlier ones. Here it is installed with the 1985 dual support cam follower and set in neutral gear:


It's not being held by any "flat area" made for the double arm cam follower. The only point of contact is the single indent for the pointy part of the cam follower. So I am guessing I could have used the pre-84 single bolt mount cam follower and avoided the machining.

Well anyway, at least I got this thing together and working
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