So there’s a material that covers the underside of my cylinder head shrouds that looks like roofing tar. Unlike roofing tar it’s quite hard, though I imagine the heat cycling has caused it to harden. If I had to guess it was added to quiet things down, but it seems to me it would inhibit cooling. Anyone ever see this done to a shroud? It was on the inside of the points cover too!
Chris
GT550 cylinder head shroud has roofing tar?
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Re: GT550 cylinder head shroud has roofing tar?
The covers on my GT550 cafe build had the “tar” on the underside as shown in the pic. Had the tar removed before spiffing up the covers.
GT550-ram-air-0777 by jabcb, on Flickr
The GT550 points cover is an aluminum casting similar to the other covers. No “tar” on the underside on all of the ones I’ve seen.
The GT750 points cover is a steel stamping with a “tar” disk on the back side.
![Image](https://live.staticflickr.com/4702/28127939749_0282709b31_h.jpg)
The GT550 points cover is an aluminum casting similar to the other covers. No “tar” on the underside on all of the ones I’ve seen.
The GT750 points cover is a steel stamping with a “tar” disk on the back side.
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Suzuki:
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Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
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Re: GT550 cylinder head shroud has roofing tar?
Yup, that’s exactly what I have! Guess I’ll just leave it in place since apparently it’s common. Maybe the former owner replaced the points cover with one from a GT750, hence the “tar”.
Thanks for your reply jabcb!
Thanks for your reply jabcb!
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Re: GT550 cylinder head shroud has roofing tar?
It's been on all my 550s including the one on the 550J I bought in August 1972. Cowl & points.
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Re: GT550 cylinder head shroud has roofing tar?
It'll be just a sound-deadening material to stop that big thin alloy casting ringing.
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Re: GT550 cylinder head shroud has roofing tar?
Yes, to quiet down the ringing. All of the 380 covers I've seen have it.
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Re: GT550 cylinder head shroud has roofing tar?
Any potential ringing on a GT550 can be solved with the expansion chambers.
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
- Alan H
- Moto GP
- Posts: 3175
- Joined: Thu Feb 16, 2012 11:50 am
- Country: England
- Suzuki 2-Strokes: 4 x GT550s - J, M, A, B.
- Location: The Republic of South Yorkshire
Re: GT550 cylinder head shroud has roofing tar?
That doesn't solve it - you just can't hear it!!!
![Laughing :lol:](./images/smilies/icon_lol.gif)
![ssh :ssh:](./images/smilies/icon_shh.gif)
![Laughing :lol:](./images/smilies/icon_lol.gif)
Think of how stupid the average person is, then realise that half of them are more stupid than that.