Acceleration issue - Honda Rebel Forum
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post #1 of 30 Old 04-17-2019, 01:18 AM Thread Starter
 
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Acceleration issue

So I have an 87 250, I just cut off a baffle on the exhaust and changed the handlebars. I did have to modify the throttle a bit for the new grips. All I really did was make a larger opening to fit the handles. That being said, now when I give full throttle while in gear, it seems to choke it out and almost feels like it will kill it if I keep going. I am curious if this could be because of cutting off the baffle or maybe I messed something up in the throttle/cables. The exhaust does smell a bit strong, so im wondering if it is running rich or if removing the baffle does that. Any thoughts and opinions are appreciated. Thanks
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post #2 of 30 Old 04-17-2019, 06:23 AM
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To run right - the engine needed the back pressure provided by the baffles.

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post #3 of 30 Old 04-17-2019, 10:19 AM
 
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1) It is possible if you left something behind in the pipe that isn't supposed to be there and it can't blow exhaust fully, like the core you were drilling out?

2) Doublecheck your enricher, the handlebar change might have torqued/kinked/misaligned the cable or the lever or such and it is not fully shutting off.
3) the exhaust system is designed and tuned like a church organ pipe, for the low end pulsed exhaust, to actually evacuate the piston's exhaust most efficiently, thus a slight loss of lower end torque is the expected result of mucking with the pipes, not severe choking at high rpm. At high RPM the exhaust stream acts as a continuous fluid flow and the pipe "tuning" is less important.

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"The bravest thing for me to do is admit when I am wrong" - unknown
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post #4 of 30 Old 04-17-2019, 10:35 AM Thread Starter
 
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Originally Posted by kryton View Post
1) It is possible if you left something behind in the pipe that isn't supposed to be there and it can't blow exhaust fully, like the core you were drilling out?

2) Doublecheck your enricher, the handlebar change might have torqued/kinked/misaligned the cable or the lever or such and it is not fully shutting off.
3) the exhaust system is designed and tuned like a church organ pipe, for the low end pulsed exhaust, to actually evacuate the piston's exhaust most efficiently, thus a slight loss of lower end torque is the expected result of mucking with the pipes, not severe choking at high rpm. At high RPM the exhaust stream acts as a continuous fluid flow and the pipe "tuning" is less important.
I cut the exhaust by about 6", just behind the baffle, so no drilling and nothing left in it. What's interesting is it seemed like the higher rpms were choking it out, but I'll have to double check. I didn't get much time to test it out, but it ran great ad long ad I didn't try to gun it. Is there a way to adjust anything to compensate?

I'll double check the enricher since im also trying to figure out why my left turn signal stopped working. Feels like something could be off inside there.
I knew going into this that messing with it could end in poor results, but I got the bike super cheap and decided to have fun with it. Just need to figure out some of the small kinks in it and it'll be good to go. Thanks for the help.
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post #5 of 30 Old 04-17-2019, 10:51 AM
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If one of the bulbs is burned out, the other blinker on that side won't flash. It's the most common cause for not blinking.

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

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post #6 of 30 Old 04-17-2019, 10:55 AM Thread Starter
 
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If one of the bulbs is burned out, the other blinker on that side won't flash. It's the most common cause for not blinking.
I wish it was that easy, however I did not know that if the front wasn't working the rear wouldn't either. Before I took it apart the left stopped working. Looked like the PO put too much weight on it and severed the rear turn signals. Was not enough write to repair, I put LEDs on both front snd rear. Honestly when i turn my right blinker on, it works fine. When I put the left one on it turns itself off or off it does stay on both rear turn signals light up.
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post #7 of 30 Old 04-17-2019, 01:18 PM
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When switching to LED turn signals, it requires other mods to work. See here: https://www.hondarebelforum.com/f80/...sion-8183.html

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

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post #8 of 30 Old 04-17-2019, 02:26 PM Thread Starter
 
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When switching to LED turn signals, it requires other mods to work. See here: https://www.hondarebelforum.com/f80/...sion-8183.html
Thank you for that, I had read through that before doing this. It's just odd the one blinks fine and the other does not. I could have missed something though. These are not led bulb replacements, they are entire units. I suppose the one could be bad even, but not sure why it turns both back ones on. The back is also an integrated unit not sure if that makes a difference. I may have wires switched some where, so I'll reread that and double check everything again. Ive used your guys forums a lot in this build before ever starting it and even while building it. You guys are different knowledgeable, that is why I decided to join up. I have done lots of mods on other bikes, but they were all much newer, so this is a bit new to me. Thanks again for your ideas.
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post #9 of 30 Old 04-17-2019, 03:06 PM
 
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After I put emgo shorties on my 86 I had to shim the needle to cure the hesitation when giving throttle. Its ran great every since.
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post #10 of 30 Old 04-18-2019, 07:02 AM
 
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Quote:
Originally Posted by Jowka View Post
Thank you for that, I had read through that before doing this. It's just odd the one blinks fine and the other does not. I could have missed something though. These are not led bulb replacements, they are entire units. I suppose the one could be bad even, but not sure why it turns both back ones on. The back is also an integrated unit not sure if that makes a difference. I may have wires switched some where, so I'll reread that and double check everything again. Ive used your guys forums a lot in this build before ever starting it and even while building it. You guys are different knowledgeable, that is why I decided to join up. I have done lots of mods on other bikes, but they were all much newer, so this is a bit new to me. Thanks again for your ideas.

If they don't flash and you still have the OEM flasher, it depends on the massive current drawn by incandescent bulbs to cycle, led's don't pull enough juice to trigger it to flash.
If you have both sides flash, you need to do something about the panel bulb. It's wired between both sides and lets enough juice leak across to light an LED. Pulling the panel bulb should stop the both-side flash. To use the panel indicator you need to either add diodes or change to a 3-prong electronic flasher (there are threads for both)
If you have one light on one side flash but not both lights, check the bulb/led and wiring.
If you have intermitten response from the turn signals, you have to hit it several times to get it on, you have dirty contacts in the switch and should clean them (several good youtube vids on that)

2009 Honda Rebel 250; 2009 Honda Shadow 750 Spirit
"The bravest thing for me to do is admit when I am wrong" - unknown
HRF Answer #1 You should take the MSF Rider Course
HRF Answer #2 You need to clean your carburetor
HRF Answer #3 Sorry we assumed if you didn't say otherwise
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