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Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

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  #1  
Old 26th October 2021
Porkchop9 Porkchop9 is offline
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Default Bad Vibration & Engine Stumbling 99 Custom 883

Vibration first noticed in handlebars in the last few months. Now the engine vibrates terribly and misses badly. The bike is not ridable. Bike starts using choke. Coil is within specifications.

I suspect the motor is running out of balance, maybe due to a faulty crank position sensor. Where is the sensor? It's not on the left side front under the oil filter as shown on some Sportsters.

Thanks in advance.
Porkchop
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  #2  
Old 26th October 2021
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John Harper John Harper is offline
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Don't you just have the "nosecone" ignition module on your year bike. I don't think they had a crank position sensor on those years. I have read that the nosecone modules can go bad from engine heat. I think the crank sensor wasn't used until 2004.

John
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Old 27th October 2021
Porkchop9 Porkchop9 is offline
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Thanks, John, that's what I'm thinking. I don't understand what the nosecone module is.

Clymer manual says the ignition module includes the "cam sensor" located in the right side gearcase cover. but I think that's a separate sensor.

Where is the nosecone module?

Thanks much.
Steve Hughes,
Archer, FL
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Old 27th October 2021
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I think the entire ignition module on your bike is enclosed in the "nosecone" timing cover, it's the round protrusion on the right side camshaft cover. On my 1991, only the "cam sensor" (it reads off #2 cam) is within the nosecone and the rest of the ignition is just rear of the battery mounted on the frame. Your bike has the timing sensor (cam sensor) and ignition module components all in one unit under the nosecone. That's probably why the heat related failures are reported. In fact, HD does not even offer a replacement for that module as it was a loser. I'm not sure the preferred replacement as my bike has the separate ignition module, but I'm sure some forum members will be happy to provide some suggestions. I want to say a Dynatek nosecone replacement module is a popular choice, but don't take my word for it. I did put a Dynatek external module on my bike when I bumped it from 883cc to 1250cc per vendor's recommendations.

Failure of the nosecone modules is common, though not frequent.

Google "Ronnie's Harley Davidson microfiche." You can pull up a parts diagram of your bike and see the ignition module for your year, it's basically the Factory Parts Manual put online for selling on the internet.

Good luck, and welcome to XLF!!!! Lots of knowledgeable folks always happy to help you here.

John
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  #5  
Old 27th October 2021
Porkchop9 Porkchop9 is offline
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Great help, John. Thank you very much.

Steve H.
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  #6  
Old 27th October 2021
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You might run a compression check. Make sure the motor is mechanically sound before you go chasing a potential tuning issue. Also, it'll give you the opportunity to inspect the spark plugs.
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Old 27th October 2021
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From the http://sportsterpedia.com/lib/exe/de...o.jpg?id=start

Ignition info for the '99. READ DOWN to the correct year

http://sportsterpedia.com/doku.php/t...k:evo:engctl01

Also, when were the plugs & wires replaced?
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Old 27th October 2021
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Compression! Yes. Thank-you.

Great ignition info, too. Sportsterpedia, wow. I'll check the spark with a timing light & replace the plugs.

The bike has 13k miles. I've owned for eighteen years & never ran it hard. I replaced the carb recently and was doing trial runs. The terrible engine vibration caused me park it.

Thanks again,
Steve Hughes
Archer, FL
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  #9  
Old 27th October 2021
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Quote:
Originally Posted by Porkchop9 View Post
I replaced the carb recently and was doing trial runs. The terrible engine vibration caused me park it.
Did the "terrible engine vibration" start right after you replaced the carb?

When problems start after you've worked on the bike, the first thing you look
at is the last thing(s) you did.
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Old 27th October 2021
Porkchop9 Porkchop9 is offline
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Thanks, I agree. I rode the bike 2 or 3 times after the new carb, but just for a few miles. I was fine tuning the idle and cable adjustments when the vibration began.

Good suggestion, I'll look real close at the carb set-up. Thanks again.
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