Low mileage, low top speed - Page 2 - Honda Rebel Forum
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post #11 of 68 Old 07-05-2019, 12:59 PM Thread Starter
 
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Thanks 7milesout. The choke nut was stripped; the choke is a plunger. I replaced the choke SE nut. Problem remains.

I will replace plugs, check the spark, do the chop test, test compression (meter is in the mail), review ignition and valves; timing issues will be last.

Honda Rebel 2005; Yamaha TX500 (prior)
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post #12 of 68 Old 07-05-2019, 01:18 PM
 
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Suspecting the new air filter was blocking air flow, I rode 20 miles at 50mph without the filter, but still the same problems.
FWIW that's probably enough to undo those three carb cleanings.


Assuming the engine and carb check out, I would look at the sprockets and compare the tooth count to stock (14T front/33T rear), as an overly taller final ratio can create similar results.

"Ride Safe, Chop Safer" Motorcycles are not unsafe. However; they are extremely unforgiving of inattention, incompetence, ignorance, and stupidity.
Dismantling, sawzalling, and rattle canning does not make a bobber.
Those are STEPS toward customizing, not customizing unto itself.
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post #13 of 68 Old 07-05-2019, 04:00 PM Thread Starter
 
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Thanks Shadow Shack. I'm re-installing the air filter now. Atmosphere is clear today so hopefully I didn't clog the carb. The sprockets are stock, the same for the last 30,000 miles.

Latest: New spark plugs installed. Chop test run without the air filter, and the plug looks creme white. I hope with the air filter my next Chop test should be tan.

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post #14 of 68 Old 07-05-2019, 04:23 PM
 
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I guess I would double check that SE valve. Make sure its working properly, or replace it.


The other guess I would make would be regarding fuel flow. At higher speeds, any fuel restriction may result in lack of power. Maybe confirm your fuel flow is good, and that your fuel tank breather line is neither clogged or pinched, as that too will restrict fuel flow.




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post #15 of 68 Old 07-05-2019, 05:22 PM Thread Starter
 
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Chop test #2 with air filter installed: Plugs are now gray/tan and one is a shade darker. See photo.

I still cannot get above 57 mph on flat land.

Perhaps my recent fuel petcock (Amazon thing) is the problem? Or carb cleaning #4?
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post #16 of 68 Old 07-05-2019, 08:04 PM
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The Rebel sips so little fuel it doesn't take much to supply the engine. To see if fuel is flowing, turn the petcock to off, pull the hose from the tank at the carb, place the end in a clean, clear container, and turn the petcock on. Fuel should flow freely, and there shouldn't be any off color, rust, or other contaminants in the container.
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Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #17 of 68 Old 07-05-2019, 08:51 PM
 
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Honda suggests that it could also be the Ignition Control Module. It is electronic.

Or the Ignition Pulse Generator.
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post #18 of 68 Old 07-06-2019, 02:40 PM Thread Starter
 
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Hoping this is not an electronic problem, Guba.

Fuel flow checks out fine. So I'm going to clean the carb again. I suspect float bowl valve. Because -- while preparing for the Chop Test #3 today, I was happily cruising at 50 mph when the engine cut out as if it needed the reserve. But I had plenty of fuel. Slowed down to 40 mph and the engine continued smoothly.

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post #19 of 68 Old 07-07-2019, 09:41 PM Thread Starter
 
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Still I have a top speed of only 57 mph.

Everything appears OK -- except I have not yet reviewed the ignition electronics. Including compression test of 155 and 160.

Is this a problem? The drain screw O-ring is broken. That screw just closes the drain, correct? O-ring not necessary?

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post #20 of 68 Old 07-07-2019, 10:44 PM
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Quote:
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Is this a problem? The drain screw O-ring is broken. That screw just closes the drain, correct? O-ring not necessary?
It's only a problem if it leaks. if you ever need to drain the carb, it may not reseal without the O-ring.

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

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
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