Low mileage, low top speed - Page 5 - Honda Rebel Forum
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post #41 of 68 Old 07-15-2019, 07:30 PM
 
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Best wishes but it doesn't seem electrical in nature ... to me. I'm no expert though.

I'm stuck on flow. Could there be baffling in the exhaust coming loose and blocking exhaust flow somewhat? Has there been anything done to the exhaust in the last few months?

Hoping you get back to full power ASAP.

2016 Honda Rebel 250 - The "Piglet."
Totally Stock at the moment.
Bought on 6/29/19 with 44 miles.
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post #42 of 68 Old 07-15-2019, 07:39 PM
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Before you replace the fuel filter, turn the petcock to the off position, disconnect the fuel hose at the carb, then open the petcock and drain fuel into a clean container. If the flow is good, and there is no rust or other contaminants in the fuel, there's no reason to replace the filter IMO.

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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post #43 of 68 Old 07-15-2019, 08:18 PM Thread Starter
 
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Flow is good. Filter is 'melting' slowly, dang plastic thing from Autozone. But flow is good.

Exhaust pipes were replaced six months ago from eBay. They sound OK, standard pipes.

I'll re-check everything

Maybe the enrichment circuit...

Back in 2010, there was a similar problem from Laurenda, who did not reply after a few pages.

https://www.hondarebelforum.com/f12/...peed-4125.html

Enrichment circuit was a suspect.

Honda Rebel 2005; Yamaha TX500 (prior)
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post #44 of 68 Old 07-15-2019, 08:46 PM
 
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Reb - put calipers on those pipes and make sure (at the very least) that they are 1-3/8 inch outside diameter. If the pipes are too small in diameter, they may not flow as much a high rpm. At low to mid rpm they would be fine. At high rpm is where the problem would crop up if they're too small. The inside diameter is where it is important, but start on the outside to get an idea.

2016 Honda Rebel 250 - The "Piglet."
Totally Stock at the moment.
Bought on 6/29/19 with 44 miles.
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post #45 of 68 Old 07-15-2019, 10:47 PM
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How was it running before the exhaust change? Visufilter brand is ethanol resistant I believe.

Did you turn the carb air/fuel screw, the one with the tab at top, out 2 3/4 turns from lightly seated when reassembling the carb?

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 #46 of 68 Old 07-16-2019, 09:52 PM Thread Starter
 
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Pipes are OEM,identical to my prior OEM. To test for blockage the net says use a vacuum gauge. Not another tool They sound normal. Any simple way to test?

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Originally Posted by 7milesout View Post
Reb - put calipers on those pipes and make sure (at the very least) that they are 1-3/8 inch outside diameter. If the pipes are too small in diameter, they may not flow as much a high rpm. At low to mid rpm they would be fine. At high rpm is where the problem would crop up if they're too small. The inside diameter is where it is important, but start on the outside to get an idea.

Honda Rebel 2005; Yamaha TX500 (prior)
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post #47 of 68 Old 07-16-2019, 10:12 PM Thread Starter
 
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I now have a K&N sintered bronze plastic filter. It is small and good so far.

I set the carb pilot screw at 3 1/4 turns out cuz I'm at sea level. Maybe I should put it back a half turn for your spec at 2 3/4 (but isn't this pilot setting related only to the idling circuit? My problem is low top speed (or perhaps weak torque at high RPM).)

Planning on another carb cleaning, and measuring float bowl height, should be 18.5 mm.

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How was it running before the exhaust change? Visufilter brand is ethanol resistant I believe.

Did you turn the carb air/fuel screw, the one with the tab at top, out 2 3/4 turns from lightly seated when reassembling the carb?

Honda Rebel 2005; Yamaha TX500 (prior)
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post #48 of 68 Old 07-16-2019, 10:18 PM Thread Starter
 
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I considered the Visufilter 90 degree model, but some rare person said that it broke on him, so I just went with the simple K&N cone-shape. Probably should have bought the Visufilter, cuz of the sharp Rebel tube bend, but after fiddling, I have the K&N fitted well with the proper tube lengths.

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Visufilter brand is ethanol resistant I believe.

Honda Rebel 2005; Yamaha TX500 (prior)
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post #49 of 68 Old 07-17-2019, 10:28 AM
 
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Quote:
Originally Posted by reb2005 View Post
Pipes are OEM,identical to my prior OEM. To test for blockage the net says use a vacuum gauge. Not another tool They sound normal. Any simple way to test?
The simplest thing I can think of is to put a pair of calipers on them to check their O.D. If you don't have calipers, hold a tape measure or ruler up to it. It should work well enough to be within a 16th of an inch. The O.D. should be 1-3/8" (or 1-6/16ths).


I'm just wondering if those pipes are Chinese knock offs, maybe they are a tidge smaller in diameter than the originals. I'm stuck on the air flow through the engine because the way it acts. I had a car that had a very limited / low top speed based on a catalyst going bad and clogging the exhaust flow. When that happens, the cylinder(s) cannot get fully evacuated, and not only does the combustion properties become poor (from exhaust being in the mix), but the amount of fresh air getting into the cylinder is limited. This limiting engine speed.


But let me also ask you this. Are you able to achieve the max speed in each gear (1st through 4th) as marked on the speedometer? Or are they all limited?




7milesout

2016 Honda Rebel 250 - The "Piglet."
Totally Stock at the moment.
Bought on 6/29/19 with 44 miles.
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post #50 of 68 Old 07-17-2019, 03:33 PM Thread Starter
 
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These pipes measure correctly, stock pipes.

I'll check the top speed per gear -- more carefully later -- after reinstalling the carb.

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The simplest thing I can think of is to put a pair of calipers on them to check their O.D.

Honda Rebel 2005; Yamaha TX500 (prior)
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