Installing Mushroom tappet adj.

cash said:

bpatton said:

Last rebuild I used lashcaps and new mushrooms and they seem to be working out. Can't really see the wear surfaces but the clearances are holding ok after 6000mi.

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Got agree with, Bob I've always fitted lashcaps to my Brit-twins, I usually shorten the valve stem by at least the thickness of the lashcap. My Mk3 has had this mod including the mushrooms for close on 50,000 miles without a hitch.

Cash

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I got to ask, what is the process for shorting the stem?

Hm, Did I really do it that way, hm, was in '03, but for sure I didn't know how or remove spindles to do 3 of the caps and mushrooms, but Do Remember one mushroom/cap would not give any adjustment room for lifter/cam gap, so left the cap out as hot to trot to ride away and did, in spades by '04. 7000 miles total, 5000 in hot performance and use, then 11,000+ WOT event, then 2000 more miles at lower performance levels. Ken Canaga said head good but mushrooms chewed up and need caps for stems.

I need new adjusters yesterday so Ken can trim for good geometry and I can remain just a handy pilot. I assume the vendors kit was looked into already so appreciate the hand holding to make it a no brainer to order.

I've got new lash caps and spent a lot with RGM. Where does one find light mushroom adjusters nowadays? My invoice stack rather loose left note books,
are a lot to dig through as last resort to source.

T95

I got to ask, what is the process for shorting the stem?

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I make up a spilt collet to support the valve stem in the lathe chuck and turn tip off. The case hardening isn't very thick, probably why it dents.

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Use a good tip, plenty of RPM and light cuts. Make sure any tit in centre is removed.

Cash

Are you talking about this guys stuff? http://www.britishbikeconnection.com/ see towards the end of the flyer.

I know sod all about Commandos, but as the valve system is similar to a Triumph.
Has anyone tried putting the new mushroom adjusters in the lathe and removing a couple of thou from the outside diameter of the tip?
This way they would screw in just like the originals. There was a discussion over on the Triumph RAT forum a couple of months ago about the same subject.
I know lightweight tappet adjusters are available for Triumphs, are they the same size as a Commando? Your alternative is to drill a 1/8" hole down the center of the adjuster to a depth of about 3 threads from the tip.
I've got mushroom adjusters fitted to my Bonnie and I'm very happy with them, I've now done over 2K miles and still no indents on the valve stems.

Webby

northur said:

I thank you all for your input , here is what I wanted to hear,
unscrew the adjuster, push down on tappet .move pushrod out of way, pull tappet up, screw in said adjusters, viola.How about that HOBOT?

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Not enough clearance between the rocker and valve stem, even with the pushrod "out of the way" to remove the adjuster. You need to either remove the rocker or the valve.

maylar said:

northur said:

I thank you all for your input , here is what I wanted to hear,
unscrew the adjuster, push down on tappet .move pushrod out of way, pull tappet up, screw in said adjusters, viola.How about that HOBOT?

Click to expand...

Not enough clearance between the rocker and valve stem, even with the pushrod "out of the way" to remove the adjuster. You need to either remove the rocker or the valve.

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Would opening the valve help?

Cash

I finally installed the mushy tappets and here is the result.If you want to do this with the head still installed. You cannot do this no matter what you try unless you pull all the rocker shafts. Here is the procedure I used:You can start at either the left side or the right but start by removing the exhaust side first, remove the shaft far enough so that you can put a hooked tool at the back of the spring washer(on left) and pull it free ,trying not to drop into the spring cavity. Keep a magnet handy to retrieve it handy, Pull shaft out further so just 1/16 stays inside the head and remove the rocker, being very carefull not to lose the flat thin washer that is between it and the head. Next. Put a rag inthe cavity that goes down the centre of the head(where the push rods go) this is very important because if either washer drops down that hole it will involve a lot more work than originally planned if you get what I"m trying to say. put the puller on the intake of the same side the procedure is the same but make sure to pull the spring washer from the outside out.
When reinstalling do the intake first ,make sure the flat washer is installed(a little oil on it will keep it on) The shaft is in 1/16 right? put the rocker in position and make sure the push rod is in place and push shaft in till just before it exits the other side of the rocker, keep your magnet handy and make sure the rag is still in place , hang the spring washer on the hook tool (a small awl bent with a hook on the end) , and place it over the space between the head and the rocker, take a small screwdriver in the other hand and compress the washer while pushing it down into the space . You just need to get it started( put a little oil on it) and push it down and adjust it , untill its where it should be (patience is a virtue) and push the rocker all the way in. Now do the exhaust the same way, leave the rag in place untill youre confident that nothing will fall into that black hole.
Now do the other side the same way sart with the exhaust( the easiest)
It took me about three hours to find out how to do the first side and once you get the hang of it the second side only took an hour. It reqiures some dexterity and lots of patience, at 69 I have lots of the second but not much of the first, but I'll bet Steve can do it in 10 minutes flat.

Oh, I forgot to mention that when you are doing each one make sure the opposite side(exhaust or intake) is on the down stroke to relieve pressure on each rocker that youre removing.

Boy, that sounds like a project. I seem to remember that I could get one side (intake or exhaust, not both) on without removing the rocker shaft, but I did have to move the push rod out of the way which can be done without removing the rocker shaft or head. Sorry I didn't write it all down when I did it. The other side has to either remove the head or rocker shaft. I don't think it took me 15 minutes, but then I had the head off and on several times.

You're 69, you've got me beat, I thought I was doing good at 67, I'm fast loosing my nerve and that gut feeling for speed.

Dave
69S

Keep after it you guys,Im 58 so far its mostly the knees. an still kick, Just not as long , I have a 75 ES for when I cant kick anymore. Ill pass the 74 down to my son he has a younger knee.

Phil

An 86 yr old friend and his wife in a sidecar were enjoying participating again in the Bay to Birdwood run (one of the largest in the world) Adelaide, Australia. I remarked to Bluey saying "when Im your age I hope Im still riding! And his reply was" hope Im around to see it"! Mmm.. thats 36 years he'll have to wait