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Valve Spring Constants R11
- Darryl.Richman
- Posts: 2138
- Joined: Fri Oct 27, 2006 3:00 am
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Timing diagram
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- r11-timing.jpg (1.01 MiB) Viewed 3210 times
Crank timing
I think my engine has a gear driven distribution because the magneto is gear driven .Now , I can progress with the dismantling of the engine .I bought this very beautifull bike from a seller shop in Beigium ; the bike was supposed to be fully restaured . But , from what I can see inside the open engine ( it is old burned oil black ) , they have forgotten the mechanic side of the full restauration ! As we say in France , I have been f...k !
Thank you for your replies .
JCL
- Darryl.Richman
- Posts: 2138
- Joined: Fri Oct 27, 2006 3:00 am
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These bikes have a similar
Something I found helps......
- Darryl.Richman
- Posts: 2138
- Joined: Fri Oct 27, 2006 3:00 am
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Assembly tips
I have done a very similar thing on my R52. It is extremely helpful for setting the valves and verifying the ignition timing. In my case, while the motor was apart on my bench, I used a flat bladed screwdriver to put a mark on the edge of the lower window, then positioned the crank at OT and VZ (full advance) and made a corresponding mark on the front of the flywheel to match the case mark, and stamped them as OT and VZ. Then I dabbed a bit of white paint into the marks and stamps to make it easier to read.
I would do this again with any split case motor. It helps so much in verifying your assembly and installation of the magneto and setting the valve timing.
While we're talking about assembling these motors, one thing I do after bolting together the two halves is add oil to the sump and, using the conrods, spin the crank (clockwise looking from the front of the motor). After a few dozen rotations, I want to see oil leaking from the conrod big ends. This verifies that the oil passages are clear and the oil pump is working.
- mark_weiss
- Posts: 173
- Joined: Sat Nov 16, 2013 11:49 pm
Resonance
-Chris
Essentially, this is the answer. Not so much different spring rates as different resonances. Dual (and even triple) springs are not uncommon in high performance applications. Each spring has a different wire diameter and different number of coils. This helps to damp resonant vibration, thereby reducing the likelihood of spring breakage.
qualitycycleservice.com
Help for dismantling R11 engine
I have difficulties to extract the bearings from their housings , and also to take the timing gear from the crankshaft . I have heated these parts but none want to get out . There is perhaps a special mounting point I ignore .
Thanks
JC
The rear bearing housing with
The brass housings are close to the crank and I used a couple of wedges to start them off until I can get the puller legs under the edges.
Not sure which engine you have.... If you have the gear driven cam engine it has a pin holding the gear through the crank. I think it is tapered, it is a few years since doing this and my memory isn’t what it was! I had to take my early type crank to the crank rebuild guy to remove the gear. Mine was very tight and wouldn’t pull off with the puller I had, so I’m not too helpful with that. The gear also has a key internally so will not twist off with the pin removed. The bearing and housing should remove the same way as the rear.
If you have the chain driven cam engine the timing gears are on a key and should come off with a puller after removing the nut. The front bearing housing should remove with some heat and puller. Nothing fixes the bearings into their housings, they should remove with some heat and pressing out.
Rear bearing
Regards
JC
I don’t know if you have a
The pin on the early version is clear in the photo. The second crank is a series 5 version. If you need the part listing pages to go with the image let me know.
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