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Timing problem – centrifugal advance unit worn out?
Timing problem – centrifugal advance unit worn out?
R60/2, R65 LS
1973 Norton 850, 1973 RD 350
- skyler.robbins
- Posts: 228
- Joined: Sat Sep 22, 2018 4:14 pm
Re: Timing problem – centrifugal advance unit worn out?
Good catch there.. I bet your bike will be top notch once you install the new unit!
- jwonder
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Re: Timing problem – centrifugal advance unit worn out?
Find an old ome on eBay and rebuild it. It’s much better.
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York
Re: Timing problem – centrifugal advance unit worn out?
I’ve got the equipment to do the same testing that you did on your video. Thanks for posting that!
I’m wondering, is the rest of the advance unit is still gooda? Basically what I’m thinking of doing if the run out on the lobes of the new advanced unit are out of spec, using my old piece that has the lobes on it, but use the rest of the new unit. Weights, spring, etc., As those are the parts that are worn out on my old advanced unit.
R60/2, R65 LS
1973 Norton 850, 1973 RD 350
- jwonder
- Posts: 784
- Joined: Wed Nov 23, 2016 7:50 pm
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Re: Timing problem – centrifugal advance unit worn out?
Please post your findings as we are all in the same boat!!
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York
Re: Timing problem – centrifugal advance unit worn out?
R60/2, R65 LS
1973 Norton 850, 1973 RD 350
- San Arthur
- Posts: 577
- Joined: Sun Apr 22, 2007 2:08 pm
- Location: San Antonio, TX.
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Re: Timing problem – centrifugal advance unit worn out?
I talked to Salis about the issues with the new batch of centrifugal advance units and he is well aware of it.
I was about to order a new set for Zenaida thinking mine were worn out but my problem was a weak points spring.
Is a cheap replacement part. Good luck!
'58 R26 '76 R90S '88 R100RS '94 R100GS/PD
Re: Timing problem – centrifugal advance unit worn out?
R60/2, R65 LS
1973 Norton 850, 1973 RD 350
- jwonder
- Posts: 784
- Joined: Wed Nov 23, 2016 7:50 pm
- Location: Long Island, New York
- Has thanked: 3 times
- Been thanked: 7 times
- Contact:
Re: Timing problem – centrifugal advance unit worn out?
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York
Re: Timing problem – centrifugal advance unit worn out?
Holding my breath I tickled the carbs and gave it a kick. It started right up! The RPMs held steady at 900 RPM. Using a timing light I could see that the S Mark was steady and right where it should be and the advance F mark did not move beyond 3000 RPM! Again using the timing light I moved the induction pick up from one cylinder plug wire to the other. I did this just to make sure that I was getting a spark on both sides.
Now to check for differential timing. Not more than 1/8 inch difference between the cylinders! And that is well within the specs according to Duane on his website.
Took it for a ride to give the engine a good warm-up. Idled smoothly and accelerated well. When I got back I turned it off, waited a few minutes, and they gave it another kick. Started right up again on the first kick!
In conclusion, although there is a slight difference in the total height of each lobe on the advance unit (12 hundredths of a millimeter), the point at which the points opened and closed were the same on both lobes. So, for me, I’m going to stick with this advance unit. I don’t think the difference in the total lobe height really matters.