BMW K bikes (Bricks)

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1Back to top Go down    engine hiccup on Tue Aug 11, 2015 8:28 am

malcoops

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So I've got a small issue with my engine having a slight miss on idle plus a bit of overrun backfiring going down hills mainly.
Am I correct in assuming carbs need syncing/ dirty fuel/spark plugs?

all input appreciated

cheers
mal


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Laugh and Laugh Often

bmw kl1100lt, 1993, honda cx500 1978, honda gl500 1982, and bits and pieces
    

2Back to top Go down    Re: engine hiccup on Tue Aug 11, 2015 9:30 am

Holister

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I had to smile to myself the other day when I was backing off quite hard from forth to third coming up to a dual lane roundabout and as I passed a car in the inside lane my old girl let out an enourmously loud crack. It startled me so I can only imagine how the driver felt Laughing.

She had been fluffing and farting a little for a week or more so when I got home and she cooled down I tightened up the exhaust header bolts. They were a little loose. All good now.

You could also check the exhaust valve clearances if its been a while. They may be a bit tight.


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1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

3Back to top Go down    Re: engine hiccup on Tue Aug 11, 2015 10:31 am

Dai

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My (little) experience is with KH: check the valve clearances first and then look at balancing the throttle bodies.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

4Back to top Go down    Re: engine hiccup on Tue Aug 11, 2015 12:52 pm

duck

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What bike? (It helps to put your year/model in your signature.)

If it's a K75 then it's normal for them to backfire under moderate to heavy engine braking. Once you've owned/ridden a K75 for a while it will subconsciously teach you not to do that.


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Current stable:
86 Custom K100 (K75C fairing, K75 Belly pan, Ceramic chromed engine covers, 32/10 final drive)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
93 K1100RS
94 K1100RS
93 K1100LT
91 K1
93 K75S
http://www.ClassicKBikes.com
    

5Back to top Go down    Re: engine hiccup on Wed Aug 12, 2015 6:24 am

malcoops

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sorry, 1993 kl1100lt
seems to do it more on the cold mornings which we have had allot of lately, 2 degrees at 5;00am on the old k bike this morning, great way to start the day


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Laugh and Laugh Often

bmw kl1100lt, 1993, honda cx500 1978, honda gl500 1982, and bits and pieces
    

6Back to top Go down    Re: engine hiccup on Fri Aug 14, 2015 4:44 am

Howard64180

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I had a K1100RS a few years ago that started backfiring. In my case it was my own fault. I had been messing with the idle adjustment using the throttle stop screw (like you do on a K100) instead of using the brass TB screws; this had thrown the TPS adjustment out.

    

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