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Tach for ‘62 R69S #656872 ?
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Tach for ‘62 R69S #656872 ?
I’m looking at 2 questions for my bike:
1. There are mechanical tachs & parts available from both Max BMW (internal drive) and a custom machined source (outside drive).
Yes, I know I don’t need one but I’d like advice if I decide to do it.
2. My stock ‘62 has a non-bulge chest cover. Do all chest covers ‘61 - ‘69 fit the same bolt pattern?
Thanks guys!
- Flx48
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Re: Tach for ‘62 R69S #656872 ?
I'm seeing only one question, though I'm probably not totally awake yet...
Gather you are replacing the gen cover for one reason or another.Do all chest covers ‘61 - ‘69 fit the same bolt pattern?
All the Earles fork bikes have the same bolt pattern for mounting the gen cover.
The earlier bikes had M6/M6 mounting studs, while later had M6/M8, the difference being at the gear cover end and not the gen cover end, so you should be good.
What you may want to pay attention to is the bulges.
The '61 only gen cover had the mini bulge for the cam drive tach mount.
Don't recall if there were several iterations of the damper bulge or not, but there were several sizes of fork brace flats, so you may want to pay attention to: damper bulge vs fork flat clearance as you look at different covers.
If you don't have a damper then you don't need a bulge, though the later bulge covers came with an outline of the tach drive hole location on the inside.
Otherwise a '61 gen cover, or a Hoske tach drive mount plate on your old gen cover, would seem most desirable if wanting to add a tach.
Best-
George
- schrader7032
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Re: Tach for ‘62 R69S #656872 ?
He also says that the bolts changed four times over the years - slotted, 14mm, 13mm, and 10mm.
Beemer Garage shows the service bulletin with the parts needed for a tachometer installation:
http://www.beemergarage.com/documents/201.pdf
Here's another bulletin:
http://www.beemergarage.com/documents/250.pdf
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- Flx48
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Re: Tach for ‘62 R69S #656872 ?
Best-
George