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Rev Counter Drive / Oil Pump #619512
09/28/15 2:24 pm
09/28/15 2:24 pm
Joined: Jul 2014
Posts: 82
Los Angeles, CA
S
sharmstr Offline OP
BritBike Forum member
sharmstr  Offline OP
BritBike Forum member
S
Joined: Jul 2014
Posts: 82
Los Angeles, CA
Probably a dumb question, but just want to make sure I'm not missing something here. My tach isnt working. Its a rebuilt one aprivatepeace503 on eBay; nice unit. In troubleshooting, I found that the Tach actually works (hooked a drill up to it), but its the rev counter drive not turning. I have verified that its sitting in the case correctly (mated to the oil pump). So here's the dumb question. The oil pump should spin the drive when I turn over the engine, right? There's nothing special about the counter drive itself (no moving parts). The entire thing just spins, right? So, is my pump is bad?

I've been considering replacing it with an SRM pump anyways due to the extreme wet sumping issue I have, so I'm merely just trying to confirm that I understand what's going on.

Thanks!


1968 A65L
2004 XL 883 with a 1250 kit
2000 XLS
2007 Bonneville
2010 Bonneville SE
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Re: Rev Counter Drive / Oil Pump [Re: sharmstr] #619522
09/28/15 3:34 pm
09/28/15 3:34 pm
Joined: Aug 2001
Posts: 3,912
argyll. scotland, uk
gavin eisler Offline
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gavin eisler  Offline
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Joined: Aug 2001
Posts: 3,912
argyll. scotland, uk
These bits get broken when DPOs try to remove the inner cover without withdrawing the tach spindle first,, the oil pump drive spindle has a fragile female drive like a deep screw head, the tongue of the tach drive engages in this, probably the driving part of the screw head end is broken if its just spinning, if the oil pump itself is not spinning your motor would wreck itself fairly quickly.
You can buy this part separately to repair your pump., but it needs stripping down to make the repair.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Rev Counter Drive / Oil Pump [Re: sharmstr] #619524
09/28/15 3:45 pm
09/28/15 3:45 pm
Joined: Jul 2014
Posts: 82
Los Angeles, CA
S
sharmstr Offline OP
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sharmstr  Offline OP
BritBike Forum member
S
Joined: Jul 2014
Posts: 82
Los Angeles, CA
Ahhh, right. Makes sense.


1968 A65L
2004 XL 883 with a 1250 kit
2000 XLS
2007 Bonneville
2010 Bonneville SE
Re: Rev Counter Drive / Oil Pump [Re: sharmstr] #619542
09/28/15 6:28 pm
09/28/15 6:28 pm
Joined: Jan 2006
Posts: 1,934
Maryland
JD Offline

Moto-Amish
JD  Offline

Moto-Amish
Joined: Jan 2006
Posts: 1,934
Maryland
Here are the things that drive the tach cable.




Josh
Re: Rev Counter Drive / Oil Pump [Re: sharmstr] #619562
09/28/15 8:33 pm
09/28/15 8:33 pm
Joined: Jul 2014
Posts: 82
Los Angeles, CA
S
sharmstr Offline OP
BritBike Forum member
sharmstr  Offline OP
BritBike Forum member
S
Joined: Jul 2014
Posts: 82
Los Angeles, CA
Thanks for the pic.

The SRM pump will be here in 2 days. smile


1968 A65L
2004 XL 883 with a 1250 kit
2000 XLS
2007 Bonneville
2010 Bonneville SE
Re: Rev Counter Drive / Oil Pump [Re: sharmstr] #620263
10/03/15 6:20 am
10/03/15 6:20 am
Joined: Jul 2014
Posts: 82
Los Angeles, CA
S
sharmstr Offline OP
BritBike Forum member
sharmstr  Offline OP
BritBike Forum member
S
Joined: Jul 2014
Posts: 82
Los Angeles, CA
Came across a picture of my pump when I first took the bike apart. Its indeed broken off. I should have thought to look at my old pictures before I posted this. smirk (and it would have been nice for the engine builder to mention it....)



1968 A65L
2004 XL 883 with a 1250 kit
2000 XLS
2007 Bonneville
2010 Bonneville SE

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