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Will the head off a '78 XS1100 work on an '80 xs 1100? TIA. Later 'Dog
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Where are you going?Originally posted by scalded dog View Post
As far as I've read the "newer" engines had a bigger dome on the pistons so maybe not.
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1980 XS11 Special - chopped, dropped and OCTY is still installed
- NOW IT'S FOR SALE! $1,800 OBO
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Yes it will,but the consensus is you will probably want to use the correct cams for the head you are using.Otherwise performance may suffer.80 SG XS1100
14 Victory Cross CountryComment
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Don't think it has anything to do with the cams, but the pistons are different from early ro late model to make up compression.Nice day, if it doesn't rain...
'05 ST1300
'83 502/502 Monte Carlo for sale/tradeComment
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The 80 and later heads are deeper than the early heads and like Cnuk stated, they made the pistons with a bigger dome to compensate and give back some of the compression (not all of it, but some).
I have heard of others using the early head on the late model engine to boost compression. If you search on it I believe Dr. Dan Hodges has provided some documented experiences he has conducted personally on the subject.Life is what happens while your planning everything else!
When your work speaks for itself, don't interrupt.
81 XS1100 Special - Humpty Dumpty
80 XS1100 Special - Project Resurrection
Previously owned
93 GSX600F
80 XS1100 Special - Ruby
81 XS1100 Special
81 CB750 C
80 CB750 C
78 XS750Comment
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Thanks guys, I guess "wondering" is the correct spelling. LOL. I will try to research some of the info on here. Later 'DogComment
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The early heads will give more compression but smaller valves. Sort of a sideways move, rather than an upgrade. However, I think the early head will work fine, if that is what you have on hand.Nice day, if it doesn't rain...
'05 ST1300
'83 502/502 Monte Carlo for sale/tradeComment
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The '78 motor still runs, but smokes a lot, this was how I found out what happens when gas, unknowingly. gets in the oil, but I was thinking the head would still be ok. The '80 special skips on #3 piston. Thanks for the reply. Later 'DogComment
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Actually,gas in the oil can burn the bearings and start to knock before it throws a rod.It won't make it smoke unless you leave the gas in it,because then it is too thin and the oil will pass the rings.So if that is the problem and it didn't smoke before,put clean oil and filter on it and run it a while and see if it stops smoking.Unless it knocks too,then by all means use the head off that one to fix other.The '78 motor still runs, but smokes a lot, this was how I found out what happens when gas, unknowingly
Also,have you determined for sure that the 80 motor actually misses from having a bad head/valve?80 SG XS1100
14 Victory Cross CountryComment
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i think i have a good head laying around...i imagine its for an '80 due to it coming with 'Sunshine and the spare motor she came with.... where do you live?'81H (my first XS ) "Grey Ghost"
Stock Pilots/ 110 mains (to change)
4:1 Jardine w/ headerwrap
Windjammer(wiring issues)
SonyMarine unit for Ipod/Polk Speakers
New paint/brakes to come!!
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'80G FrankenBike (parts bike)
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'80G to fix "BlackSunshine"
Stock Pilots/125 mains
Pod filters; 4:1 Kerker??
SS Brake lines w/ new M/C's
LED Brake Lite
Needs paint....
It is better to be thought a fool than to open ones mouth and remove all doubt....Comment
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I live in Georgia. How much would you sell it for? Shipping would be a little expensive. Later 'DogComment
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