Bogging with black Spark Plugs - Honda Rebel Forum
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post #1 of 7 Old 08-20-2019, 06:50 PM Thread Starter
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Bogging with black Spark Plugs

2000 Rebel. No acceleration. Crank the throttle and it dies - in neutral or under load. Replaced the gas and cleaned the jets - no change. The plugs show a very rich mixture - both are the same. If I add choke, it only gets worse so it's obviously over rich, but how??? It can't be the accelerator pump system with black plugs. If it was the needle and seat, it should run fine for a sec or two after the carb rebuild, as the fuel bowl fills, and besides there's no evidence of flooding through the air filter with the engine off. The air filter is brand new, so no problems there.

Is this some sort of choke issue? I understand the choke is not like a typical one (a flap that cuts off the air). Can it be choking with the choke off? Bike sat for 2 years...

Any help would be appreciated.

Lewis
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post #2 of 7 Old 08-20-2019, 07:07 PM
 
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was the needle jet installed w/correct orientation?
Part #15 held in place by #34 needle jet holder.. ignore the red arrows..
if installed upside down flooding has been noted..
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post #3 of 7 Old 08-20-2019, 07:33 PM
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Welcome. What SK said.

If the bike sat for two years with gas in the carb, just cleaning the jets probably isn't going to get the carb clean enough. There are many orifices and passages that need to be spotless for the carb to function properly. If you have access to an ultrasonic cleaner, it will do a very good job. If not, soaking only the metal parts in Berrymans Chem Dip for 2-7 days is a good substitute. Chem Dip will destroy rubber and plastic. After soaking, rinse thoroughly with water and blow high pressure compressed air through all the orifices.

Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #4 of 7 Old 08-21-2019, 07:13 AM Thread Starter
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I'm sure you're correct, and I know I'll need to rebuild it more thoroughly. But I was really trying to understand what function wasn't working to cause these symptoms. Cleaning everything will fix whatever it is - I get that.

And yes the jet is in correctly (poster above) - but good thought.

Thanks.
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post #5 of 7 Old 08-21-2019, 03:35 PM
 
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Enricher is a siphon,, air drawn in from intake horn siphons fuel through idle jet exiting on intake side of butterfly valve....

if the plunger isn't closing off the passageway a rich mixture would result..
Looking closely at body casting one can follow the passages..
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post #6 of 7 Old 08-25-2019, 05:35 PM
 
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Just a thought-a plugged/dirty air filter will cause those symptoms too. Sometimes I have had air filters on bike that have sat for long periods of time look fine, but need cleaned/replaced anyway. The dust of time settles into those air filters, and clogs them. Then the bike acts like and evidence seems to indicate the choke is on, but the problem, more often than not is a dirty/clogged air filter.
Just good for thought bro.
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post #7 of 7 Old 08-27-2019, 05:27 PM
 
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Probably going to have to thoroughly clean the carb. I have found that boiling it for 10-15 minutes does a great job of melting all the varnish. I follow up with a blast of carb cleaner through each opening followed by a blast of compressed air.

Might want to check the pilot screw. If it is set wrong then you can have a very rick (or lean) situation. Had that on my Yamaha. Not sure about the Rebel, but generally if the pilot screw is on the engine side of the carb closing it leans it and opening it enriches it. Just the opposite if on the breather side.

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