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Old 11-12-2010, 05:59 PM   #1
The Other JC OP
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Finally fitted Lennies Rocket Sprockets

Finally got round to installing Lennies Rocket Sprockets on my '07 1200GSA after sitting in my toolbox for that last 2 months (the sprockets that is, not me!) waiting for a warm wind free day. I do not have the luxury of an enclosed garage.

Took my time and read the following 2 guides multiple times over.

http://forums.pelicanparts.com/bmw-r...ent-101-a.html

http://www.itwasnotme.com/BMW_R1200GS.html

All in all a pleasant experience. No surprises. Took about 4 hours including lunch.

My notes:
For the left hand side cam chain tensioner, I just used a 15mm spanner. It was enough to loosen the bolt to undo with fingers. Rather than take it all the way out I just lifted it up and let it sit on the edge of the thread top. I did not torque this bolt back up, just made a mental note of the pressure to remove it.

Don't forget to mark the chain where the arrow on the sprocket goes.

I have a large torque wrench which I used to undo the sprocket bolt - a good length for plenty of leverage. I put the bike in gear and stood on the back brake, leaning over the seat to crack the bolt. Similar on right side, foot on break. Same for re-torquing. No dramas

Following Lennies advice, after taking out the sprocket bolt, I put a screw driver into the hole as I pulled off the sprocket to stop it falling anywhere I did not want it to. At that point I put a nylon tie round and through the engine casing/sprocket/chain to stop the sprocket falling into the casing while trying to get the chain off. I did the reverse when putting the new sprocket in, only removing the nylon tie when the sprocket was back on the chain.
To remove the chain, slide your finger over the top of the sprocket under the chain.
Lennies sprockets must be marginally larger in diameter as the BMW sprocket came out the hole, but Lennies would not go back through the hole, had to slide them in from the front. Though side by side I could not see a difference!. Maybe a few thou differnce only!.



The nipple on the sprocket lines up with the slot at the end of the camshaft. To align the camshaft with the nipple, get a screwdriver in the slot and turn the camshaft. Tap the sprocket on gently - its a very snug fit..

Torque the bolt back up to 65NM. Put it all back together.

======

I noticed the difference straight away just riding the bike out to the road. A low RPM smoothness. Not the jerky unpleasantness of old. Took her for a spin and gone is the low speed hesitancy. I actually struggle now to remember what the bike was like before the sprockets, but it has better pull from low revs, and rolling acceleration is better.
Very pleased with the result. A value for money performance upgrade with positive riding results. Feels like the bike is biting at the bit to go go go at the higher speeds. Must be careful.

edits: spelling

The Other JC screwed with this post 11-13-2010 at 01:36 PM
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Old 11-13-2010, 07:48 AM   #2
sunlinden
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thanks

Thanks for the feedback. In your opinion, was it worth the money and time spent? I was thinking of getting this set next year after my warantee expires. Dave
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Old 11-13-2010, 01:29 PM   #3
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Quote:
Originally Posted by sunlinden
In your opinion, was it worth the money and time spent?
For a lazy afternoon, comparing with the money spent on other 'stuff', I would recommend it. The bike runs happily in a gear higher than normal at the lower speeds, and gives more torque where its needed.

Just make sure you have the tools you need, the 15mm size bolt for the left side tensioner is not a standard size in small socket/spanner kits. I found this out the first day I started the upgrade. Good job I started on the left side (right side is 17mm). Had to put it back together to use the bike to go get the 15mm spanner.
And if you have not already got a torque wrench, this upgrade is a good reason to get one.
If you are not a confident mechanic, have someone help who is!.
Also, read and understand the instructions before you start, not during the opertation.

The Other JC screwed with this post 11-13-2010 at 01:39 PM
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Old 11-13-2010, 08:14 PM   #4
SCflyer
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Looks like a relatively low $$, higher return mod...as long as you don't drop anything down into the motor . How's the fuel range, any less or about the same? Can you explain how they work? Understand basics but not to knowledgable on how some engine internals (cams and such) work. Do you have any other mods (chip, remapped) for the fuel injection or stock set-up and just added the sprockets?

Thanks

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Old 11-13-2010, 11:30 PM   #5
macxx1
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Speaking from (too) many years of hot rod experience, basically the
revised sprockets are said to "advance" the cam.

By advancing the cam, the valve openings and closings occur
earlier in the rotation of the engine.

The event that has the main effect on the torque curve, in this
case lowering the rpm at which peak torque occurs and therefore
helping the engine make more torque at most rpms below the torque
peak rpm, is closing the intake valve sooner after the piston is at
bottom center and starts to rise in the compression stroke.

Closing the intake valve sooner traps more compression pressure
in the cylinder at lower rpm, making for the increased torque at
lower rpms.

It doesn't change the duration of the cam, meaning the number of
degrees of rotation the valves are open, just makes them open
just a little sooner and close a little sooner, with the intake valve
closing having the greatest effect on the torque curve.

If you "retarded" the cam/s, you'd be doing the opposite - making
things happen a few degrees later and allowing the cylinder to fill
more at higher rpm from the "ram" effect, or the speed and inertia
of the inlet charge continuing to fill the cylinder longer after the
piston starts it's climb up from the bottom of the stroke in compression.
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Old 11-13-2010, 11:58 PM   #6
The Other JC OP
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Quote:
Originally Posted by SCflyer
How's the fuel range, any less or about the same?

Do you have any other mods (chip, remapped) for the fuel injection or stock set-up and just added the sprockets?
I have not run a full tank through the bike yet, but by all other accounts fuel consumption is the same or better - better by running a higher gear for the same speeds.

I also have the Accelerator Module installed, which definately tamed the bike at low revs when pulling away, it was a bit too frisky for my liking - it smoothed out the power delivery.

I shall try removing it soon to see what difference the sprockets make in that area.
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Old 11-14-2010, 07:12 AM   #7
Davis53
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This is very interesting, but have the wait for the warranty,
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Old 11-14-2010, 09:17 AM   #8
Andrew
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Thanks for the report, nice to hear confirmation of smoothed low-end torque. Have you taken up to max RPM? How does it feel at the top end?
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Old 11-14-2010, 09:57 PM   #9
signit98
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Glad my little write up was of help... you'll be VERY happy in the long run.

I have helped many people put them in and not a single one will ever taken them out again...
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Old 11-15-2010, 04:45 AM   #10
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"I have a large torque wrench which I used to undo the sprocket bolt - a good length for plenty of leverage."

I'll send you a breaker bar for the postage.
Jim
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Old 11-16-2010, 01:26 PM   #11
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theotherjc,

Glad you got the sprockets installed and are happy with the result.

That makes me happy.

Enjoy the many miles of riding and feel free to contact me in the future.
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Old 07-06-2011, 05:31 AM   #12
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detaled installation instructions please

Getting ready to install mine next week on my 07 12GS. Are there more detailed pictorial instructions available anywhere? This is one install I don't wanna goof-up!

Appreciate any help. Thanks.
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Old 07-06-2011, 07:19 AM   #13
Dan Căta
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Too bad I did not take pics on the Rt I did this last time. Did not change the sprockets with aftermarket ones but the owner mounted the distribution chain 1 tooth wrong...

Anyway, I will also do this mod in the near future. My RT seems too lazy when having my gf in the back sat + 10 tons of luggage (to be read cosmetics, small oval/round mirrors, etc.)

Dan.
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Old 07-06-2011, 07:56 AM   #14
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I just got around to installing mine last week. Have about 400 miles on it since the swap. A definite improvement for the way I use the bike, thanks Lennie! Only problem was self-inflicted, got in a bit of a hurry and did not tighten left tensioner enough, had small oil leak. Took TB back off, got tensioner properly tight and all is well.
Greatly reduced the amount of down/up/down gear shifting to keep the engine sounding happy riding in rolling hills.

Don't know, may be peculiar to my bike, but though it pulls smoother from lower rpms, it did seem to take a little "snap" out of it that i missed after riding awhile. I am running power commander III set up pretty lean - i bumped up the low and midrange another 5 percent rich, and it responded very nicely to it. Think a dyno tune, re-mapping is in order in my case, and it will be even better.
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Old 07-19-2011, 01:46 AM   #15
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J_White,

I am glad you are happy with the result.

Saves the left foot a little work and makes walking easier after a long ride.

Opposed,

I have the install instructions on a PDF if you email me I will send to you.
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