Low mileage, low top speed - Honda Rebel Forum
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post #1 of 68 Old 07-04-2019, 03:45 PM Thread Starter
 
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Low mileage, low top speed

My Rebel 2005 has sooty spark-plugs, low mileage (60mpg), boggy acceleration, and low top speed (57mph).

The first problem (apparently) was stripped threads on the choke SE nut. I replaced that, but problems continued.

I cleaned the carburetor three times, and the last time with an ultrasound cleaner, and jets look very clean.

Suspecting the new air filter was blocking air flow, I rode 20 miles at 50mph without the filter, but still the same problems. The plugs were only slightly less sooty.

Help please!

Honda Rebel 2005; Yamaha TX500 (prior)
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post #2 of 68 Old 07-04-2019, 04:38 PM
 
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Here's how to read your spark plug.

https://www.championautoparts.com/Pa...ark-plugs.html
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post #3 of 68 Old 07-04-2019, 05:03 PM Thread Starter
 
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Mine is sooty, a "carbon-fouled plug", "too rich". I could "switch to a hotter plug"? Brushing out the existing plugs wouldn't suffice?

Quote :
Black, dry soot on the electrodes and insulator tip indicates a carbon-fouled plug. This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long. Your mechanic can offer you advice on what type of spark plug to buy to replace the damaged plug, but you may want to consider switching to a “hotter” spark plug (the higher the spark plug number, the hotter the plug).

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post #4 of 68 Old 07-04-2019, 05:04 PM Thread Starter
 
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So maybe running 200 miles with the Choke SE nut stripped, carbon-fouled the engine and plugs? And I need new plugs?

First thing I did after noticing the stripped threads was to change the oil and brush the plugs clean.

Honda Rebel 2005; Yamaha TX500 (prior)
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post #5 of 68 Old 07-04-2019, 10:17 PM
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How many miles are you putting on your bike annually? How many miles on the plugs?
Was it starting without choke? If yes, has it always done that? If the only thing that changed was the choke nut was stripped, I can't see that causing all the issues you mentioned.

Bad rings can allow oil to get past them and soot up the plugs, but that's not neccessarily your problem. Have the valves been adjusted within the past 4,000 miles? If not, do so and then do a compression test to see if the rings and valves are ok. Let us know what you find.
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post #6 of 68 Old 07-04-2019, 10:39 PM
 
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If your spark plugs have the correct gap, Honda says it could be a bad ignition control module.

I stripped the choke SE one time, very easy to do since it's made of plastic, but all my problems disappeared after I changed it.
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post #7 of 68 Old 07-04-2019, 11:01 PM Thread Starter
 
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30,000 mileage. 22,000 miles on Iridium plugs. 200 miles with choke SE stripped threads. 1 year since last valve check (never were out of spec prior).

Was wondering if carbonaceous plugs were shorting the arc a little, despite my brushing them clean.

Will do recommendations, THANKS.

Honda Rebel 2005; Yamaha TX500 (prior)
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post #8 of 68 Old 07-05-2019, 12:04 AM
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I would first do a spark plug chop test. Should have mentioned it earlier. Once the bike is warmed up, at highway speed, when and where it is safe to do so, hit the kill switch and go into a parking lot or other safe place. Pull both plugs (remember to take a plug wrench with you) and see what they look like.

Your iridium plugs should still have quite a few miles left.
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Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #9 of 68 Old 07-05-2019, 08:29 AM
 
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reb - I'm late in here. From what I'm gathering it seems you have owned this bike for a while. If I'm wrong on that, how certain are you the carb is running the stock set-up? If you have owned it for a while, I believe your carb is NOT this issue, and likely plenty clean from your efforts. Since you seems to be getting air (no filter) and fuel (clean carb), the next thing is spark. You have good plugs but is the rest of the ignition system operating normally? I say this because (I'm lucky), my 2016 Rebel is new, and has extremely low miles. When I had it in 5th this morning and accelerated past 55 mph, I would have sworn it was in 4th it accelerated so well. I tried to upshift again. This bike could use a 6th … and 7th gear!


Outside of your ignition components, the next thought that crosses my mind is … could timing of either the ignition or valve timing be off? I don't know how the ignition works with the timing on this bike, as I'm a Rebel newbie, so I'm just thinking out loud here. The timing thing doesn't sound likely either as I would think that timing having jumped a tooth off on either valve timing or ignition, the problems would be larger than what you're experiencing. A lot of words, likely no help.




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post #10 of 68 Old 07-05-2019, 11:03 AM
 
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I just had another thought, seems more realistic. Assuming the carb choke has an air blocking flap like on my car's carburetor, make sure that flap is fully moving out of the way when the choke is off. If that flap is partially closed, it will limit the amount of air that can get into the engine. Thus, a rich AFR and limited power.
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