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#880222 05/11/22 1:45 am
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I've read several threads on modifying the valve lash adjusters. My trident project has what appears to be the "half ball" adjusters. In the parts there was a set of brand new "mushroom" adjusters. I feel like the originals seem like a good system compared to say the 60's twins, is there a benefit to the mushroom, or more extreme choices (Porsche etc)? Not planning on racing it, just want it run good. When I saw the sort of floating "half ball" I thought "Cool they improved those little studs" then I went down the rabbit hole reading all the adjuster threads


65 TR6R 68A65T 69 B44VS. 74 T150V 19 Chieftain
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My 72 came to me with a set of "captive ball" adjusters. The top of the valves were nice and flat with no wear, indicating that the system is sound, apart from the fact that their mileage was unknown. Tales of failures of these adjusters led me to purchase a set of Elephant Foot adjusters from David Madigan, which have been on for 15,000 km/9400 miles. They work faultlessly, and will stay on.

On inspection, my captive ball adjusters shows no signs of degradation and to be honest they do look like a nice piece of kit. The footprint isn't very big, but still a lot bigger than the original point contact. In my view the EF system is still probably superior thanks to its larger footprint that should impart very small lateral forces on to the valve tip, while the longitudinal force is distributed across the whole surface of the tip.

Another nice system is lash caps used with either standard solid adjusters or large "mushroom head" adjusters. Thanks to the nicely polished and hardened surface, less lateral forces are imparted, and the adjuster tips don't dig in. Lash caps tend to rotate, which helps in both respects.
My experience with "mushrooms" working directly on the valve tip isn't very good, they still tend to dig in which also tends to deform the surface of the adjuster.


SR

DAMadd #880253 05/11/22 10:10 am
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The only hassle with the original adjusters is getting the gap right. The half ball is harder to 'feel' the feeler gauge slip and slide. It takes a bit of long term practice to get the 'feel'.
Having said that, I still have them, can't see any reason to change, once adjusted they are as good as anything out there.

DAMadd #880255 05/11/22 11:09 am
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My project '72 T150V has plain adjusters and serious degradation to the valve stem ends. I added lash caps and spun the adjusters in the lathe with a high speed cut-off wheel to shorten them and add a screwdriver slot to replace the square end. Still to be seen if this all worked, as I have yet to start the bike.


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R3/T150, T160, EF, 911, VW adjusters (no mushroom available)
[Linked Image from live.staticflickr.com]
You can see how the original R3/T150 adjuster gets beat up by having a point contact with relatively soft surfaces. Mushrooms with lash caps have harder surfaces so last longer. T160 (Ducati style) flattened ball increase the contact area. EF, 911 and VW adjusters cover the entire top of the valve.
911 and VW adjusters need the rockers rethreaded to 8mm. EF adjusters are 5/16"-24.
VW adjusters have to be shortened.
To use T160 or EF adjusters on early long stem R3/T150, the valve stem has to be shortened 1/4". Stock valves do not have hardened tips so no change in the service life.

DAMadd #880315 05/11/22 11:06 pm
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Great info.
It's a 74 and has the 160 adjusters already, hoping the PO was aware when he did the headwork. If you recall it was one of my first posts, it has the ribbon/weird automotive style inner springs.

Any chance you have any of those elephant foot ones left? ( Well , at least 6)

Last edited by DAMadd; 05/11/22 11:08 pm.

65 TR6R 68A65T 69 B44VS. 74 T150V 19 Chieftain
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AIUI the later 74 t150s came from the factory with the Ducati style adjusters.


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I have to get the latest batch into heat treat.

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That's great news! It LL be just a little till I get to work on the triple. I tried to send that in a pm, but your pm is full. When they come out certainly let me know how I go about getting set. Thanks again!


65 TR6R 68A65T 69 B44VS. 74 T150V 19 Chieftain

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