Topic: 750 cam tower question

[Don R]

 Has anyone ever seen cam holder caps that weren't stamped for location?
  I recently got two late model (they have the shaft holding bolts) decent towers with the 4 caps strung on a cable tie. I couldn't find the letter codes to match the ends on one of the towers so I got them under a good light, I can see B50 faintly engraved like the bearing codes on a crank.
  The problem is, both of the caps and both ends have the same number. It's not that big of a deal, it's a 50/50 guess and I can check rotation of a cam or bore roundness to see if there's a difference, I just wondered if they were replacement parts or what? 
 
 

[Pbeattie89]

I cam carriers and caps were only sold as a matched set. They couldn't be bought separately.

Sent from my SM-G991W using Tapatalk

[Jerry Rxman Griffin aka MuthaF'er]

After market perhaps? Yamiya sells some I believe

[bryanj]

Try just placing them on the towers, frequently you can feel a step/ridge if they dont line up.
The tower takes most of the load and wear

[seanbarney41]

Yeah Don, I have seen caps that were marked like that.  It was the first engine I had ever had apart so it had me real confused.  I just put them where they seemed to fit the best.  Never had any more problems with it.

[HondaMan]

I've seen the ones you're talking about and decided to measure them: the caps are bored (molded, actually) larger than the bottom parts of the bearings. This makes perfect sense and is a good way to make a universal cap, because I have yet to see an upper cap with journal-worn marks on one. They run fine, since the cam never 'jumps upward' unless the cam chain gets so loose that it could actually jump time (I HAVE seen that..., from a broken tensioner roller during a roadrace), at which point the cam could jump around a bit.

I think Honda simply decided to make them less expensively by molding the lower bearing journals slightly "high" and then milled them down to an accurate diameter, which is completely possible today, given modern CNC equipment. In the 1970s, not so much.

[Don R]

 Cool, I thought it might be something like that. The seller had a privateer drag race shop so he could have gotten them anywhere. I'm still waiting for him to find more 750 stuff in the stash he drug home from the bike shop when they closed it. 

[PeWe]

I have got later, probably K7/K8.
They have prints ink numbers. Not as before stamped into the metal.
Here one of tower pair.
Number 34, the other has 20.

The caps can only sit flipped one way and print meet print.
I punched marks direct when I got them. Ink might disappear.

[Don R]

 Awesome.