BMW K bikes (Bricks)

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cobaltc4s

cobaltc4s
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'92 K75, 15K miles. Throttle response hesitation when engine is cold (sputters, coughs, hesitates). Runs fine after warm up. Ambient air temp has no effect (same result - summer 90F, winter 40F). >> All rubber replaced, includes fuel system, pump, lines, filters, injectors sp. plugs etc. >Replaced MAF sensor. >Adjusted valves. >Adjusted and synced intakes. >Checked and secured all electrical connections. >Checked idle circuit. >Removed, cleaned, plug wires. >Replaced water temp sensor. 
Next stop Coils and Plug Wires.
What have I missed? Suggestions, thoughts?  - THX

    

Laitch

Laitch
Life time member
Life time member
I'm interested in knowing whether you let the moto idle before riding off, whether you use the increased cold starting speed adjuster (choke control) when starting, and how much time it takes the engine to warm up and run fine. Smile


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1995 K75 81,000 miles
K75 - Cold throttle hesitation - stumble. Usa-lo10
    

cobaltc4s

cobaltc4s
New member
New member
Laitch wrote:I'm interested in knowing whether you let the moto idle before riding off, whether you use the increased cold starting speed adjuster (choke control) when starting, and how much time it takes the engine to warm up and run fine. Smile
Length of time to warm up and proceed without hesitation depends on ambient temperature. It may take 3 or 4 minutes at med-high idle in winter - and 2 minutes in summer temps. I usually let it fast idle a while then drive around the neighborhood for a few blocks at 10-15mph before I can head out at 35-40 without sputtering. After a mile or so it's perfect for the rest of the day.

    

moriarti

moriarti
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Life time member
No two motors run the same, my K needs full choke to start and ride off and a few minutes in slow traffic. My mates 75s needs no choke to start or ride off. We have pulled the sparkplugs on both, looked the same nice colour no soot. You might try same with your K just to be sure Very Happy Very Happy


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1984 k100 rs red/black VIN  0004449
    

Laitch

Laitch
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Life time member
cobaltc4s wrote: It may take 3 or 4 minutes at med-high idle in winter - and 2 minutes in summer temps. I usually let it fast idle a while
BMW recommends starting the Brick and riding off, not idling; that works for me, too, down to 17ºF but by that time snow then mud usually make a ride on the gravel road down the mountain unappealing to me until April. K75 - Cold throttle hesitation - stumble. 177381

I have a '95 K75 and its cold start lever only has two positions—fast and faster. Try starting then riding right off at its lower setting; a quarter mile to a mile of riding might be all it needs to settle down. I shut the cold start down after the Brick is in third gear and always get dependable throttle response after a mile. It also gets a predictable 50 mpg during the riding season.

Like moriarti indicates, some Bricks can be cold blooded, but that is only an ephemeral state. A Brick that runs fine after a couple of minutes is preferable to one that starts off fine then runs not-so-fine after a couple of minutes, which is more often the complaint around here. Smile

Good luck!


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1995 K75 81,000 miles
K75 - Cold throttle hesitation - stumble. Usa-lo10
    

6Back to top Go down   K75 - Cold throttle hesitation - stumble. Empty Cold start Thu Jul 21, 2022 5:39 am

caveman

caveman
Platinum member
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I have managed to accumulate several bricks. All have different starting preferences but all do not run smooth till they get up to normal operating temperature. The slowest one to warm up may take up to ten miles (on a very cold day) and one if I try to start on high idle on a warm day it will flood and be very hard to get fired up. Because of my lazy nature I have learned to accept them and love them for who they are.

    

92KK 84WW Olaf

avatar
Life time member
Life time member
I just fire up and ride. Have always done that.


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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 49,840 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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