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Author Topic: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.  (Read 1773 times)

Offline advCo

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Over the winter I picked up this F650 ST. I had been wanting a newer, more reliable bike that I can use as a daily while I wrench on the vintage stuff. The seller disclaimed that it had some milky oil, and after doing some research on these bikes I narrowed down the possibilities to a faulty water pump seal, or a blown head gasket.

Once I got the old girl home, she looked pretty clean. About 50k miles and the motor should be barely broken in. The bike actually included all the original paperwork, and the maintenance records since new.

Besides the obvious coolant leak issue, a few cosmetic issues, leaking fork seals and some pretty thin brake pads will all get addressed.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline advCo

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #1 on: Jul 19, 2018, 02:22:17 »
So I cleaned the carbs and fired her up to get the oil circulating so I could drain it and see whatís what. No bueno. Looked like a melted Frosty mixed with soot and poo.

I decided to start with the simpler solution and replace the water pump shaft and seal, despite the fact that the maintenance records said it was done fairly recently. The water pump seal is basically a 20k mile maintenance item on these motors and from everything I can tell is the only crux of the Rotax lump.

"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline advCo

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #2 on: Jul 19, 2018, 02:26:04 »
After the water pump is done, I changed the oil and test ran the bike again just to get it warmed up. It looked ok in the OIF tank but draining out came the same frothy mess.

So into the motor we go. Itís a pretty straightforward motor and game apart pretty easily. Once I got the head off, it was pretty clear that the culprit was the head gasket.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline advCo

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #3 on: Jul 19, 2018, 02:36:16 »
A pile of parts were ordered including new circlips, rings, a set of kibblewhite valves and seals, base and head gasket, etc.

I ended up replacing the thermostat since the PO had deleted it for some reason that is beyond me.

The whole top end went out to a local machine shop that builds racing motors. Cylinder and piston clearance measured within spec, and the original cross hatch could even still be seen on the barrel.

Machinist surfaced the mating surfaces between the head and cylinder. They pulled vacuum on the head and cylinder,  skimmed about .003Ē off between the two surfaces, cut in the new Kibblewhite valves and shimmed the valves. I need to pop the valve cover off and check the clearances before I run it.

The last few months Iíve been building a new kitchen in our house from scratch and coming up to the home stretch on that project. So I hope to get back on this as soon as thatís finished.

Currently, the motor is back together, just needs the carbs installed and itís ready for a test fire.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline trek97

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #4 on: Jul 19, 2018, 08:25:43 »
WOW, sorry for your troubles.  But looks like its going your way now!!!    8)

Offline Maritime

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #5 on: Jul 19, 2018, 09:30:10 »
That oil is nasty, but you'll sort it out I am sure.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
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Offline canyoncarver

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #6 on: Jul 19, 2018, 14:39:14 »
She'll be like new. 
--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, 65 Norton, my never finished shovelhead chopper, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
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Offline The Jimbonaut

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #7 on: Jul 19, 2018, 14:44:39 »
Sweet man, we can embark on our ďrestorationsĒ together and see how the plans of mice and men unravel


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Offline Brodie

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #8 on: Jul 19, 2018, 19:52:01 »
I love the look of a fresh milled head.
What is your plan for the styling of the bike?
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline Hurco550

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Re: 1997 BMW F650 ST Bluebird - Repair, maintain, ride.
« Reply #9 on: Jul 19, 2018, 20:35:33 »
Yisss! I'm in

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"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
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1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
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