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Author Topic: 1997 BMW F650ST to F650R: Enduro Hellride Conversion  (Read 11583 times)

Offline Hurco550

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #30 on: Jan 06, 2018, 17:01:46 »
What's the availability of oversize pistons for that lass?

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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"
~ bradj
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
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Online irk miller

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #31 on: Jan 06, 2018, 18:09:29 »
What's the availability of oversize pistons for that lass?

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Good question.  So far, I haven't seen a one.  Just replacement jugs and pistons, and rings. 

Offline Hurco550

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #32 on: Jan 06, 2018, 18:11:33 »
Good question.  So far, I haven't seen a one.  Just replacement jugs and pistons, and rings.
Is it a nikasil barrel?

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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"
~ bradj
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
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #33 on: Jan 06, 2018, 18:13:26 »
Is it a nikasil barrel?

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Yes

Offline Hurco550

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #34 on: Jan 06, 2018, 18:15:13 »
Yes
could well be fine with fresh rings then

Sent from my SM-G920V using Tapatalk

"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
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
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Online irk miller

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #35 on: Jan 06, 2018, 18:16:51 »
could well be fine with fresh rings then

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Yeah, that's what I'm thinking.  Amazingly, the valves don't seem to leak.  I actually expected the exhaust valves to be roasted.  It was stored outdoors and the airbox was partly fucked with.  So good chance condensation got into the cylinder.

Offline Hurco550

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #36 on: Jan 06, 2018, 18:20:44 »
Yeah, that's what I'm thinking.  Amazingly, the valves don't seem to leak.  I actually expected the exhaust valves to be roasted.  It was stored outdoors and the airbox was partly fucked with.  So good chance condensation got into the cylinder.
Be a good/ cheap place to start. Re lining barrels can get a little spendy

Sent from my SM-G920V using Tapatalk

"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
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
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline The Limey

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #37 on: Jan 07, 2018, 05:03:25 »
Weren't they Aprilia engines?  You may find tuning parts/barrels/big bore kits on sale advertised as being for Aprilia which may fit.

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #38 on: Jan 07, 2018, 13:58:46 »
The bore is beautiful. Looks like I should get by with a set of rings, a head gasket and a base gasket.  The valves don't leak one iota.

This is a really pretty motor. Dead simple and well engineered.



The hardest part to pulling the top end was getting the cylinder head off. It was about 3mm short of clearing the long studs, so I put a block in-between the jug and head and removed the studs.




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Offline JustinLonghorn

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #39 on: Jan 07, 2018, 17:25:22 »
 I'm in. 
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

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