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Old 09-04-2011, 04:05 PM   #1
Skylar OP
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Preferred motor sourcing (replace) for Airheads?

I'm looking specifically for a solid R90S motor to build off of. I don't know many bikers or Airheads for that matter.

Anybody here have decent luck sourcing just motors? I have everything else.

Thanks for your time.
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Old 09-04-2011, 04:07 PM   #2
JamesOn2Wheels
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Ibmwr

there's a rebuilt r90 at IBMWR right now - complete rebuild, 0 miles
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Old 09-04-2011, 04:15 PM   #3
Skylar OP
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Quote:
Originally Posted by JamesOn2Wheels View Post
there's a rebuilt r90 at IBMWR right now - complete rebuild, 0 miles
I see it. I (believe it or not) wasn't really aware of that place but it looks like a great resource- thanks so much.
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Old 09-04-2011, 07:34 PM   #4
bmwrench
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Why an R90S?
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Old 09-04-2011, 09:23 PM   #5
Skylar OP
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Bike was originally an R90

He wants a 90S motor for it.

We thought about a 100, but he's less concerned with top end, wants a mill that's faster off the line.
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Old 09-04-2011, 10:24 PM   #6
wirewrkr
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Quote:
Originally Posted by Skylar View Post
He wants a 90S motor for it.

We thought about a 100, but he's less concerned with top end, wants a mill that's faster off the line.
As far as the actual motor is concerned, the only difference between the actual S motor and a regular R90, is the slightly higher compression pistons and the intake spigots for the Delorto carbs. the rest is the same (except for black painted/coated cylinders)
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Old 09-07-2011, 03:50 PM   #7
Skylar OP
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Quote:
Originally Posted by wirewrkr View Post
As far as the actual motor is concerned, the only difference between the actual S motor and a regular R90, is the slightly higher compression pistons and the intake spigots for the Delorto carbs. the rest is the same (except for black painted/coated cylinders)
An S motor will be rarer & likely more expensive than a 90 motor, so I guess he'll pull the trigger on whichever one comes in the right condition & price. Thanks for the info.
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Old 09-07-2011, 04:21 PM   #8
bmweuro
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f the bike is a 76 you might as well still a 1000cc in it. The bottom end would be the same as a 900.
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Old 09-08-2011, 03:07 AM   #9
ducsingle
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Quote:
He wants a 90S motor for it.

We thought about a 100, but he's less concerned with top end, wants a mill that's faster off the line.
Then he should opt for an R100 engine. Or find a bottom end and install a 1070 kit. Larger displacement = more torque = faster acceleration.
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Old 09-08-2011, 04:39 AM   #10
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Originally Posted by ducsingle View Post
Then he should opt for an R100 engine. Or find a bottom end and install a 1070 kit. Larger displacement = more torque = faster acceleration.
and = less reliable, needs custom tuning, and much shorter life. Any stock 90 or 100 will bolt right in and be easy to set up stock and give the long term reliability they are famous for.

If you go with a 90, do try for a 76 block. It will have the larger cylinder bores in the block so anything later is a simple bolt on situation.
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Old 09-08-2011, 09:45 AM   #11
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...I saw an R100 shortblock somewhere on the web yesterday, CL, maybe IBMWR for like $100...

Or how about this, looks like a good deal: http://marketplace.ibmwr.org/ads/view/id/191603
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Old 09-08-2011, 09:46 AM   #12
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Quote:
Originally Posted by Rapid Dog View Post
...I saw an R100 shortblock somewhere on the web yesterday, CL, maybe IBMWR for like $100...
I just picked one up off of ebay for $100 and it's in REALLY nice shape. It was another $50 to ship it, but hey it's most of an engine.
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Old 09-08-2011, 09:55 AM   #13
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Quote:
Originally Posted by Skylar View Post
We thought about a 100, but he's less concerned with top end, wants a mill that's faster off the line.
Fit the 100 and replace the FD with one from a 75 or 80?

Paul.
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Old 09-08-2011, 09:17 PM   #14
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I would love to build an EbayCLIBMWR bike
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Old 09-09-2011, 06:04 AM   #15
Skylar OP
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Quote:
Originally Posted by Rapid Dog View Post
...I saw an R100 shortblock somewhere on the web yesterday, CL, maybe IBMWR for like $100...

Or how about this, looks like a good deal: http://marketplace.ibmwr.org/ads/view/id/191603
We've been in touch with this gentleman, but it's a "1978 motor" but can't be a 900 because there wasn't a 900cc in '78.

Has to be an 80 or 100 if the year's correct.

Might have to pass on that one. I think he's set on a 900cc. Thanks for the heads-up though.
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