Low mileage, low top speed - Page 3 - Honda Rebel Forum
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post #21 of 68 Old 07-07-2019, 09:46 PM Thread Starter
 
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It doesn't seem to be a problem, nevertheless, I ordered another O-ring.

Honda Rebel 2005; Yamaha TX500 (prior)
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post #22 of 68 Old 07-07-2019, 10:52 PM Thread Starter
 
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So... with an ignition timing test looming, I need a timing light I guess. Will a cheap one do? Or are there caveats?

Honda Rebel 2005; Yamaha TX500 (prior)
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post #23 of 68 Old 07-09-2019, 11:35 AM
 
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I go with 7milesout. I thought choke partially on from the start.

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post #24 of 68 Old 07-09-2019, 12:20 PM Thread Starter
 
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Thanks, however, I fixed that immediately. It did foul plugs and engine, but I replaced plugs, choke SE nut, and oil. Plugs run tan color now, as photo above shows.

I ordered a timing light and can't see any other path presently.

Honda Rebel 2005; Yamaha TX500 (prior)
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post #25 of 68 Old 07-09-2019, 02:29 PM
 
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Dumb thought maybe, but have you confirmed your carb drum is free to rotate completely? Why I ask is, when I go WOT, I have to twist my RH fully, reach over with my LH, hold the throttle where it is, re-grip with my RH and twist again to actually hit the WOT stop on the drum. I have to twist it about 720 to get to WOT.


OK, Ok, ok I exaggerate. But that drum is too dang big. It takes too much twist to get to WOT.


This idea of the possibility of your carb not getting to WOT is just another variation of what my brain seems to think your bike's problem is. For whatever reason, it seems to me that the engine is not getting all the air / fuel that it should be capable of. Here are some other "ideas" even though they may range from dumb to impossible.

  • Your intake has some sort of blockage, not allowing full flow. Your spark plugs would still look good because at your max speed, your AFRs would still be good due to the CV carb slide, keeping a proper AFR.
  • Your intake valve(s) is(are) not fully opening. Heck, your exhaust valve(s) may not be fully opening either, not fully evacuating the exhaust.
    • Your cam lobes are worn down the nub (ha, not likely), but you get the idea.
  • The CV slide is sticky, and getting stuck not fully slid up. AFRs still good slide not all the way up, therefore the jet needle is not all the way up, AFR good, spark plug color good.
  • Your carb's drum doesn't rotate completely (as suggested above).
  • Valve clearances bad out of tolerance, so not getting the valve pushed as far open as possible.
  • VTEC not kicking in, oh wait, this is not a civic.
  • An intake gasket somewhere between the carb and the manifold is severely out of position and blocking airflow.
  • Etc.
You get the picture. My mind is stuck on there being something blocking flow. I could be wrong. But if this were electrical / ignition related I tend to doubt it would only manifest at high engine load. I would think if it were ignition related, there would be other strange engine running behaviors. But I've been wrong before i.e. I'm married.




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2016 Honda Rebel 250 - The "Piglet."
Totally Stock at the moment.
Bought on 6/29/19 with 44 miles.
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post #26 of 68 Old 07-09-2019, 07:05 PM Thread Starter
 
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The throttle and WOT have never been a problem before, and are not now as far as I can tell.

If the timing test does not reveal something, this Friday, then I'll return here and reconsider all the ideas.

Honda Rebel 2005; Yamaha TX500 (prior)
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post #27 of 68 Old 07-09-2019, 07:39 PM
 
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Provided you have all carb issues handled, I'm putting my money on Ignition Control Module.
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post #28 of 68 Old 07-10-2019, 11:11 AM Thread Starter
 
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And the ICM is tested with a timing light, correct? I have one on order.

Does the ICM advance the spark with higher RPM?

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post #29 of 68 Old 07-10-2019, 12:01 PM
 
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Yes, the CDI aka ICM provides spark advance..
I see a quick jump at idle to full advance when minimal throttle applied..
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post #30 of 68 Old 07-10-2019, 12:33 PM Thread Starter
 
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Thanks, and for the bonus: "CDI aka ICM"

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