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Old 03-29-2012, 07:07 AM   #1
lloydunknown OP
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Airhead Head Swap 82 R100RS to 83 R100RT

Greetings,

Can I install a pair of '82 R100RS heads on my '83 R100RT?

Thanks,
Lloyd
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Old 03-29-2012, 07:17 AM   #2
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Sure.
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Old 03-29-2012, 07:33 AM   #3
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Quote:
Originally Posted by lloydunknown View Post
Greetings,

Can I install a pair of '82 R100RS heads on my '83 R100RT?

Thanks,
Lloyd
Same bike, different fairing.
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Old 03-29-2012, 07:44 AM   #4
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Wonderful! So the whole big valve vs small valve and 38mm exhaust vs 40mm is totally moot?

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Old 03-29-2012, 09:03 AM   #5
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In your case, yes.
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Old 03-29-2012, 09:08 AM   #6
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You inmates are awesome! Many thanks to all that replied.
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Old 03-29-2012, 09:26 AM   #7
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Wasn't '77 the only year with the big valve heads and the 40mm exhaust?

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Old 03-29-2012, 11:01 AM   #8
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Wasn't '77 the only year with the big valve heads and the 40mm exhaust?

Woodgrain
81-84 R100 heads are all the same. 77 heads have a different shaped combustion chamber but would work and not all had 40mm exhaust.
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Old 03-29-2012, 11:02 AM   #9
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thru '84 had big valves & 40mm carbs,no?


* BMWEURO just beat me to it.
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Old 03-29-2012, 02:15 PM   #10
supershaft
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R100/7's had 32mm carbs with small port heads but that is it I think as far as R100's go.
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Old 03-30-2012, 05:59 PM   #11
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Quote:
Originally Posted by lloydunknown View Post
Greetings,

Can I install a pair of '82 R100RS heads on my '83 R100RT?

Thanks,
Lloyd
That all depends on how mechanically adept you are, access to tools and the space to pull this off.

(I'm obviously in wise-ass mode lately - but I couldn't resist...)

Yeah, the heads are the same - interchangeable.
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Old 03-30-2012, 06:27 PM   #12
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R100/7's had 32mm carbs with small port heads but that is it I think as far as R100's go.
There is an intake spicket available for the 40mm carbs. If you used the R100/7 heads you would end up with good torque and better gas mileage. I have done this on the post 1988 R100 for many years.
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Old 03-30-2012, 06:34 PM   #13
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I have a set of those spigots! I have never been impressed with 40mm Bings though. I would rather have even more torque and even better mileage with 38mm Dell's or Mikuni's.
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Old 03-30-2012, 08:11 PM   #14
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I have a set of those spigots! I have never been impressed with 40mm Bings though. I would rather have even more torque and even better mileage with 38mm Dell's or Mikuni's.
I'm surprised you have a set of those spigots. They are not very common.
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Old 03-30-2012, 10:34 PM   #15
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If I remember right, I ordered them new about ten years ago. I was just curious to see how a lot of the Euro stuff is set up when I put Dell's on my R100. They were real cheap back then at cost plus ten.
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