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Old 01-29-2013, 02:49 AM   #31
chasbmw OP
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Joined: Feb 2006
Location: Bath Uk
Oddometer: 1,790
Starter motor is fine
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http://i46.photobucket.com/albums/f1...ps6e61ae2e.jpg
R90s 1070 replica, R90/6
1971 Commando Fastback
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Old 05-27-2014, 06:53 AM   #32
igormortis
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Location: Moving further away from Wellington, New Zealand
Oddometer: 1,199
Did you ever resolve this? I wonder if I may have a similar problem. Just waiting on a new starter to be sure.
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Old 05-27-2014, 08:05 AM   #33
chasbmw OP
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The cleaning up with Dremel and file seems to have worked and the starter has got quieter and quieter. The bike is 3500 miles into a trip to Greece and the starter gives me no concern, it's not really under much stress as the bike starts in an instant.
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http://i46.photobucket.com/albums/f1...ps6e61ae2e.jpg
R90s 1070 replica, R90/6
1971 Commando Fastback
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Old 05-27-2014, 01:59 PM   #34
Voltaire
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Location: Auckland,New Zealand
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Could you get the later ring gear and have the old one machined off and the later one machined to fit?
Reason being is my engineer mate did that to a VW flywheel, put the type 1/2 outer of the flywheel on the Type 4 one. In woodworking terms a lap joint. then he welded it.
My R90s has a flywheel like yours, sure makes a difference to engine response and gear changing.
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Old 05-27-2014, 02:25 PM   #35
Rob Farmer
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Location: Loughborough, Leicestershire. England
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Why not just fit the later clutch and flywheel? I know you need to fit a later gearbox but the clutch is so much better on the later bikes especially if you're tweaking the engine.
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Old 05-27-2014, 10:00 PM   #36
chasbmw OP
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Location: Bath Uk
Oddometer: 1,790
I'm finding that a heavily lightened heaven flywheel just hits the sweet spot in terms of smoothness, engine performance and gear change quality! Jim has been known to fit lightened heavey flywheels to the post 81 bikes!

I did not want to go down the replacement of the ring gear because the flywheel was lightened and balanced with the engine and did not to risk upsetting that.
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http://i46.photobucket.com/albums/f1...ps6e61ae2e.jpg
R90s 1070 replica, R90/6
1971 Commando Fastback
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Old 05-27-2014, 10:33 PM   #37
Dirt_Boy
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Location: Adelaide, Australia Home of Coopers Pale Ale MMMMM
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Hi Chas, love the swiss cheese flywheel.. I had mine for a R90S lightened back in the day by 750 grams or 1.65 pounds. It should have been more but they told me it takes time to machine the big holes. I noticed that it was smoother under 3,000 revs.
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Old 05-27-2014, 11:12 PM   #38
chasbmw OP
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Loved the India pics, brought back interesting memories of the 70s
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http://i46.photobucket.com/albums/f1...ps6e61ae2e.jpg
R90s 1070 replica, R90/6
1971 Commando Fastback
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