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I bought this new (old stock) head for my GS550 restoration project but when I disassembled my engine I spotted the differences. The combustion chamber in my head is full piston size, this one has reversed domes only where the valves are and the valve diameter seems to be one millimeter smaller than mine. Other than that the heads looking exactly the same. Probably that's why the seller was advertised it as head for GS550. Is it there someone who can recognize it? I can't see part number on it.
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Last edited by Guest; 07-26-2015, 12:37 PM. -
Seems I can attach one picture per post.
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There was a 400cc four cylinder sold in some markets. I wonder if that's what this is?Comment
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I'm a bit surprised of all GS experienced members here nobody can recognize the head.Comment
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doesn't look like new to me!1978 GS1085.
Just remember, an opinion without 3.14 is just an onion!Comment
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Could be from a rare GS500 (obviously the older Inline 4, not the newer twin). Try and dig up some service manuals and compare valve specs perhaps?Comment
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Approximately where are you on this big blue marble floating gently through space? And approximately where did the mystery cylinder head come from? If we know what countries are involved, that will help narrow down the possibilities.
What year GS550 are you working on, and what year, if known, did that used head (it's definitely not NOS -- looks like it may have been stored at the bottom of a pond, frankly, and I have grave doubts about the condition of the camshaft bearing surfaces) come from?
Do all the other measurements (bore spacing, bolt pattern, etc.) match?1983 GS850G, Cosmos Blue.
2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
2015 Yamaha FJ-09, Magma Red Power Corrupts...
Eat more venison.
Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.
Celeriter equita, converteque saepe.
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Co-host of "The Riding Obsession" sport-touring motorcycling podcast at tro.bike!Comment
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HI
This one looks close what do you think ?
cheersComment
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This one is as mine (GS550). If you compare the combustion chambers you will see the difference. Actually on the unknown one the chamber literally missing, just nest for valves.Comment
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Not sure what that head is for but I agree with bwringer that that head is not NOS or was stored outside for years. Your original head would probably be easier to rebuild then that one.http://img633.imageshack.us/img633/811/douMvs.jpg
1980 GS1000GT (Daily rider with a 1983 1100G engine)
1998 Honda ST1100 (Daily long distance rider)
1982 GS850GLZ (Daily rider when the weather is crap)
Darn, with so many daily riders it's hard to decide which one to jump on next.;)
JTGS850GL aka Julius
GS Resource Greetings
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If it was a NOS head, as in corrosion free and clean, which it ain't, it would certainly boost the compression ratio
1978 Gs1085 compliments of Popy Yosh, Bandit 1200 wheels and front end, VM33 Smoothbores, Yosh exhaust, braced frame, ported polished head :cool:
1983 Gs1100ESD, rebuild finished! Body paintwork happening winter 2017:D
I would rather trust my bike to a technician that reads the service manual than some backyardigan that THINKS HE KNOWS how to fix things.Comment
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