Author Topic: Rubber puck curve position  (Read 672 times)

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Offline Kenzo1979

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Rubber puck curve position
« on: April 11, 2021, 12:10:45 PM »
So I’m changing out my valve cover gasket and I’m checking on the tower pucks that I had already replaced previously years ago. Long enough that I can’t remember if they were ever convex like they are now. I could’ve sworn they were just flat, but it’s been so long I don’t remember.

Anyway I’m looking at other people’s pictures and I find A lot of those pictures to in fact look like they are dome shape as well.  Interestingly, as it was in the case with mine also, seems like the convex side is pointing Toward the cam bolts and the concave side is facing the rocker cover. They haven’t failed, so I’m guessing everything is correct. But I just find it strange that on the rocker cover itself it has concave dimples right above where the pucks go.  Makes me think that the convex side should point towards the rocker cover unlike what I’ve been seeing. 

And again I can’t remember if they were just flat to begin with and that is just something that naturally happens over time. If anybody knows the answer to this I’m very curious before I put things back. Pictures included.








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--Kenzo
** 71 CB500, 74 CB550, 76 CB400F, 77 CJ360t **

Offline bryanj

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Re: Rubber puck curve position
« Reply #1 on: April 11, 2021, 12:14:44 PM »
From memory they start flat and distort with heat

DONT FORGET THE RUBBER BANDS FOR ASSEMBLY
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Kenzo1979

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Re: Rubber puck curve position
« Reply #2 on: April 11, 2021, 12:38:43 PM »
From memory they start flat and distort with heat

DONT FORGET THE RUBBER BANDS FOR ASSEMBLY

Awesome, thanks.  Yup, already there -- visible in the 3rd pic, lower left.
--Kenzo
** 71 CB500, 74 CB550, 76 CB400F, 77 CJ360t **

Offline flatlander

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Re: Rubber puck curve position
« Reply #3 on: April 11, 2021, 01:25:19 PM »
just for added confirmation: yes they are flat when new.

Offline caluser2000

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Re: Rubber puck curve position
« Reply #4 on: April 11, 2021, 05:44:02 PM »
Every time you set your ass on a bike, you're playing a game of Russian Roulette between yourself and your own stupidity."

Offline MauiK3

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Re: Rubber puck curve position
« Reply #5 on: April 11, 2021, 06:16:46 PM »
I think I would always put new ones in, just me.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline ekpent

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Re: Rubber puck curve position
« Reply #6 on: April 11, 2021, 06:25:15 PM »
 I was surprised once when I opened a 750 engine I was working on and it did not have any solid rubber pucks. Instead this builder had just used regular o-rings with no center section. It seemed to have sealed out the oil but would not recommend.

Offline Kenzo1979

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Re: Rubber puck curve position
« Reply #7 on: April 12, 2021, 10:18:16 AM »
Thanks again for the confirmations everyone, much appreciated!


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--Kenzo
** 71 CB500, 74 CB550, 76 CB400F, 77 CJ360t **