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merlin geikie
Flying Brick Rider
Joined: 26 Dec 2008
Posts: 343
Location: Lismore far north coast nsw australia
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 Posted: Fri Dec 03, 2010 10:41 pm Post subject: NOT ADEQUATE? |
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Surely the third generation K bike such as ours are well worked out enough to be running the correct engine revs for any road speed, as is?
Wouldn't lowering the rpms lug the engine?
From what I have heard lugging these engines is very bad news for them.
The Cruiser is a pretty much detuned oilhead from what I understand and therefore has a broader torque band for any given gear.
Maybe I am missing something here but why would you need to lower the revs in top gear? 
Are the Ks badly engineered in this area too?  |
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Flying Duck
PsyKotic Waterfowl
Joined: 27 Jan 2005
Posts: 10102
Location: Bumf***, WA
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| Posted: Sat Dec 04, 2010 10:34 am Post subject: |
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I agree with MG. A K bike is not a Toyota Camry.
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93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
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supercat1
Flying Brick Rider
Joined: 11 Aug 2009
Posts: 458
Location: Hoboken, NJ
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| Posted: Sat Dec 04, 2010 4:24 pm Post subject: |
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| Flying Duck wrote: | | I agree with MG. A K bike is not a Toyota Camry. |
i concur. i never had anything break on my toyota. 
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(formerly) 1993 k1100rs |
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mtnroads
Flying Brick Rider
Joined: 29 Mar 2005
Posts: 281
Location: West Linn, OR
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| Posted: Wed Dec 08, 2010 12:35 am Post subject: Re: NOT ADEQUATE? |
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| merlin geikie wrote: | Surely the third generation K bike such as ours are well worked out enough to be running the correct engine revs for any road speed, as is?
Wouldn't lowering the rpms lug the engine?
From what I have heard lugging these engines is very bad news for them.
The Cruiser is a pretty much detuned oilhead from what I understand and therefore has a broader torque band for any given gear.
Maybe I am missing something here but why would you need to lower the revs in top gear?
Are the Ks badly engineered in this area too? |
Taller gearing because they're buzzy at certain speeds, ie. approx 70-80mph on the freeway where some of us spend a lot of time. If you can run faster than that they smooth out again, but good luck with that now that every state and municipality is trying to up their revenue. Makes me too nervous to go that speed now. If you have the patience to run below that zone they're also fine. I took a leisurely trip through some Western US states last year on mostly two-lane roads, keeping the speed around 65mph and the bike was very comfortable at those speeds and rpm's and got good mpg. But between 68-78mph on my K-LT (GPS corrected, not speedo) the buzz can get quite annoying.
I applaud Duckbubbles and others who have resolved this on their own as BMW did later on by adding the 6th gear to the K12RS and LT. It won't hurt the engine to run 500 or even 1000 rpm lower at 70mph - 3500 rpm is hardly "lugging it". If I had time to ride more I would be considering this one for sure.
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2012 R1200RT Midnight Blue
95 K1100LT Graphit (sold)
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Flying Duck
PsyKotic Waterfowl
Joined: 27 Jan 2005
Posts: 10102
Location: Bumf***, WA
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| Posted: Wed Dec 08, 2010 2:15 am Post subject: Re: NOT ADEQUATE? |
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| mtnroads wrote: | | Taller gearing because they're buzzy at certain speeds, ie. approx 70-80mph on the freeway where some of us spend a lot of time. |
This is total boochee IMO. Keep the TB's properly synch'd and there's no buzziness. Hell, people put endless miles on rattle can HDs and still enjoy the ride.
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93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE |
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RAL88
Flying Brick Rider
Joined: 28 Apr 2004
Posts: 736
Location: New Mexico Land of Enchantment and 365 days of riding USA
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| Posted: Wed Dec 08, 2010 6:49 am Post subject: |
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I agree with Drake. Good TB syncing and put in some irridium plugs and you will get rid of the buzziness and get some better acceleration. Though you don't need the plugs to get rid of the buzziness.
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Rich
"If it ain't broke, take it apart and make it work better"
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'96' K1100LT-SE
'97' R850GS-R |
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SugarHillCTD
Site Admin
Joined: 10 Oct 2007
Posts: 4238
Location: Now in Eastern Pennsylvania
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| Posted: Wed Dec 08, 2010 7:52 am Post subject: |
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I can add some input here but coming from a different direction.
As you all know I recently returned to a K100 after a brief but unsatisfying summer on a 1400GTR (Concours)
While it did have a 6 speed trans, 6th was geared so high that unless I was at 70+ mph, it was nearly useless. At 55-60mph in 6th it was a DOG.
So under most other circumstances the Connie had 5 usable gears.
If we take this and apply it to the 5 speed K100/1100- for many of us (in the northeast USA at least- 75+ is a likely citation and I do LOTS of back road riding) a higher 5th gear would leave us with 4 usable gears under most riding situations.
Just IMHO.
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John & Cathy
'92 K100RS4V Pearl White SOLD
'04 K1200GT
IBA Several-SS1k, BBG, 50CC NYC to S.F. |
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dave n
Flying Brick Rider
Joined: 13 Dec 2003
Posts: 316
Location: Gastonia NC
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| Posted: Wed Dec 08, 2010 1:30 pm Post subject: |
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| pulhamdown wrote: | Hi. I`ve only just discovered this thread. I couldn`t work out how the final drive ratio of 2.54 was arrived at, since virtually every reference on the net said the bevel drive was 33:11. Clearly this gives a ratio of 3.0. By a stroke of luck, I have had a cruiser rear end lying in the garage for several years, so I`ve pulled it apart, counted the teeth, and discovered that the bevel drive is actually 33:13. That makes 2.5384 or 2.54. My next job is to get the bevels transferred into my K1100 bevel box, and then look forward to a drop in revs of around 800 rpm for any given road speed. I have a 15inch rear wheel currently, and am doing 5000 rpm at 60 mph! Thanks for the info. Great site
Colin |
you don't need to count teeth - just look at the end of input shaft -
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Dave Norris KOG 248
1999 Cagiva Gran Canyon
1993 K1100LT w/Hannigan sidecar
2008 Suzuki DR650 |
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Flying Duck
PsyKotic Waterfowl
Joined: 27 Jan 2005
Posts: 10102
Location: Bumf***, WA
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| Posted: Wed Dec 08, 2010 2:00 pm Post subject: |
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Don't know about other BMWs but on the K75s, K100s and K1100s it is stamped on the FD housing. For the 2V Ks it's on the top where the FD mates with the swing arm. For the 4V models it's up near the breather cap.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE |
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merlin geikie
Flying Brick Rider
Joined: 26 Dec 2008
Posts: 343
Location: Lismore far north coast nsw australia
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| Posted: Wed Dec 08, 2010 4:39 pm Post subject: ABOUT SPEED |
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SugarHIll writes;
| Quote: | If we take this and apply it to the 5 speed K100/1100- for many of us (in the northeast USA at least- 75+ is a likely citation and I do LOTS of back road riding) a higher 5th gear would leave us with 4 usable gears under most riding situations.
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YUP that is a great remark.
Here in mid eastern seaboard oz, speed cams fixed, speed cam mobile, highway patrol and unmarked cruisers, account for the fact that to go above 100kph (62mph) or 110kph (68kph) on biggest highways, will quickly deliver you massive fines and loss of license, loss of vehicle.
Over 30 kph above any limit can set you back $3K or jail for repeat offenders.
So the high speeds that many of you US folk and the europeans get away with are pretty much out of the question. Radar detectors are illegal, in the main.
So rolling down the highway at say 66 mph, is about the safe limit, in order to stay in the saddle, in a heavily controlled traffic environment as we have.
I guess it allows us to enjoy the view and saves tyres, fuel and engine rpm.  |
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yhog
Mad Brick Rider
Joined: 16 Oct 2004
Posts: 84
Location: Tokyo, JAPAN
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pulhamdown
Joined: 11 Nov 2010
Posts: 7
Location: TAYSIDE, SCOTLAND
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| Posted: Sun Jan 16, 2011 5:29 am Post subject: |
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[quote="dave n
you don't need to count teeth - just look at the end of input shaft -
[/quote]
That`s true, but since I was dismantling the cruiser bevel box to transfer the gears into my K1100 LT bevel box, it was an obvious thing to do.
Colin
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K1100 LT with VELOREX S700 SIDECAR |
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pulhamdown
Joined: 11 Nov 2010
Posts: 7
Location: TAYSIDE, SCOTLAND
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| Posted: Thu Jan 20, 2011 12:56 pm Post subject: Re: For those "Searching for Sixth Gear |
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[quote="PHIL1601UK[/quote]
I'd be interested to ear how it works out if you complete the mod Colin ....
Phil.[/quote]
Hi Phil. Just back from a long test run, and the mod`s excellent. Mind you, I`m running a K1100LT with a 15" car wheel and sidecar, so cannot
comment on doing the mod on a solo. I`ve also taken the opportunity to fit the JL paralever bushes from Rubber Chicken Racing Garage in the States, and I`m also pleased with that mod. Time will tell.
Colin
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K1100 LT with VELOREX S700 SIDECAR |
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pulhamdown
Joined: 11 Nov 2010
Posts: 7
Location: TAYSIDE, SCOTLAND
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| Posted: Tue Feb 08, 2011 4:22 am Post subject: |
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I`ve just returned from a 2,000 mile trip to Southern Germany, and Austria, and the cruiser bevel gear conversion performed brilliantly. It`s a really effective mod for a sidecar bike running a 15 inch rear wheel, but I can`t comment on how it would work with a standard wheel.
Colin
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K1100 LT with VELOREX S700 SIDECAR |
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Gary Bennett
Mad Brick Rider
Joined: 06 Jun 2005
Posts: 127
Location: Brisbane, Australia
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| Posted: Sat Jan 07, 2017 11:08 am Post subject: |
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I've had the 1200C gears fitted to my bike for about 10 years and on my K100 before that about about 13 years ago. As far as I know I was the first person to do it. Everyone said it couldn't be done.
It knocks 500 RPMs off 5th gear at 100 kph. Way better on fuel. Bugger all loss of power if any at all due to the big torque of the K11. If I forget what gear i'm in and take off from traffic lights in 2nd gear, it takes off no different than the original gearing.
If you've got the money just do it. you won't regret it. 1200C gears and the CCS-100 are the best mods i've done.
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Gary
'94 K1100RS |
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