Performance Enhancement Mods for 2009 Rebel 250 - Honda Rebel Forum
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post #1 of 11 Old 03-18-2019, 05:49 PM Thread Starter
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Performance Enhancement Mods for 2009 Rebel 250

I know there's not a lot that can be done probably to get a few more horse power but thought I'd ask. I've just bought a 2009 Rebel 250. Will be taking it to be serviced, oil change and oil filter, on Friday. Anything else for a bike that is 10 years old and has done more sitting than being ridden that should be checked or changed? It's only got 670 miles on it. It does have a new battery and has been garage kept.
Tires, air filter, jet the carb??? thoughts or suggestions???


Am also thinking of putting a K&N air filter on it. I do want a slightly louder, lower rumble exhaust. I want to not only be seen, but be heard as well. Suggestions there? What performance exhaust would give me that nice rumble sound so you can hear me coming???


Appreciate feedback!


Junebugnc
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post #2 of 11 Old 03-18-2019, 05:56 PM
 
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Originally Posted by Junebuggnc View Post
Am also thinking of putting a K&N air filter on it. I do want a slightly louder, lower rumble exhaust.
Optimum gains for any engine with intake & exhaust mods is around 15%, so assuming you can achieve that the only way you'll detect any difference will be with precision equipment (sorry folks, the butt-dyno is not precision equipment...it's almost as implausible as the next paragraph I'm about to launch).

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I want to not only be seen, but be heard as well. Suggestions there? What performance exhaust would give me that nice rumble sound so you can hear me coming???
Loud Pipes Save Lives is the longest running myth in motorcycling, it almost predates internal combustion powered cycles. Bone up on the doppler effect, or at least realize that the "attention getting loud sound" is only going in the direction the pipes are facing: the drivers behind you that can already see you.

If you really want some noise projecting forward to get the attention of those who don't see you yet, look into replacing the horn.
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post #3 of 11 Old 03-18-2019, 06:30 PM
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Congratulations on your purchase. The Rebel is a very dependable ride and easy to maintain.

If you can turn a wrench, you can save the cost of someone else changing the oil for you. It's easy to do, and there are videos explaining just how to do it. BTW, changing oil in this air cooled engine needs to be done frequently. Most members of this forum change it every 1,000-1,500 miles. With frequent oil changes, the engine will last over 100,000 miles. There is no oil filter on the Rebel 250. If someone tries to tell you they changed it, they aren't being honest.

Unless the carb and tank were drained of fuel, both will be seriously gunked up and will need thorough cleaning. If you look in the Wrenching forum, there is lots of info on cleaning tanks and carbs. There should be no reason to rejet the carb if it is cleaned well.

If you can slightly dent the tres with your thumbnail, they are probably ok. If hard, replace them. If the tires are original, they probably need to be changed. Look here for how to determine the age of a tire: https://www.tirerack.com/tires/tiret....jsp?techid=11

Occasionally, the valves on engines that sat as long as yours will stick, requiring major repair if they aren't freed up before riding. Remove the valve cover, lubricate the valve stems, and turn the engine by hand to be sure everything is moving freely before cranking the engine.

Unless mice got into the air filter, it should be ok. Putting a K&N type air filter on it will do harm and no good. K&Ns allow more dirt to get into the engine, and won't produce any more power, other than that reported by those using a "butt dyno". If anyone would dyno their bike both before and after the air filter swap, I might change my mind. Also, getting rid of the stock air box eliminates the crankcase breather feature. Some put a small pod filter on the crankcase breather hose, but it will eventually plug up with oily condensate on the inside where it can't be seen, raising pressure inside the engine to the point that it blows out the left side oil seal, allowing the oil to escape.

You can remove one or two of the baffles in the stock exhaust, but it's not going to rival the sound of a bigger bike. Ditto with aftermarket mufflers. Many who have done exhaust mods report that it sounds like an angry lawnmower. There's no way to get a big V-twin rumble from a Rebel with its small, parallel twin engine.

I'm in the camp that thinks louder pipes don't save lives, they're just annoying. If you haven't taken a basic rider course, you should. Studies show that trained riders have fewer accidents compared to self taught and friend/relative taught. It's far better to learn how to ride defensively than trust in a myth to help keep you safe. One mod I do recommend is to get a louder horn so you can be heard. The stock horn is about as loud as the Roadrunner in the cartoon.

I was writing when SS posted his response. You can see a lot of similarities in these posts

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post #4 of 11 Old 03-19-2019, 02:10 PM
 
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You can remove one or two of the baffles in the stock exhaust, but it's not going to rival the sound of a bigger bike. Ditto with aftermarket mufflers. Many who have done exhaust mods report that it sounds like an angry lawnmower. There's no way to get a big V-twin rumble from a Rebel with its small, parallel twin engine.
While you will never get a staccato rumble, you can get a deep rich tone. Volume (not sound level but cubic air space) is the answer here, the more you have the deeper the note. Fill two soda bottle with water, one with a little and one with a lot. Blow across the tops of each, the one with a little water will have a low note and the one with more water will have a higher pitched note. That's what extra air space does for you, so that's what to look for when you change your exhaust...if you want a higher pitched raspy sound go with something like Emgo Shorties, if you want a lower pitch look for something a lot longer/fatter/both like a megaphone, cocktail shaker, of fishtail to cite a few examples.
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post #5 of 11 Old 03-19-2019, 10:23 PM
 
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I wouldn't even consider getting any more power out of a Rebel. It is possible to get a little more, but it will be at the cost of engine longevity and reliability. In mechanics you don't get something for nothing. Anything you gain in one place you will lose somewhere else. I ABSOLUTELY do not recommend a K&N air filter. It's the closest thing you can get to no filter at all. It will seriously increase engine wear. You can put on any aftermarket exhaust you can get to fit. It will likely lean out the air/fuel mixture, so you will probably need to rejet the carb. I personally don't like the sound of a loud Rebel. I bought a Harley Sportster to get that "special" sound. Even Japanese v-twins do not sound like Harleys. And as for loud pipes saving lives, it just doesn't work that way. Even if someone hears you they have no idea where you are. Visibility on the other hand is a great idea. Wear a neon green helmet and vest or jacket.

A few more words on this "getting more performance" and "changing the air filter and exhaust" thing that I've only heard about a million times, maybe more. "Tuning" is both a science and an art. Most people who try it wind up with less power than they had stock. It may seem like there is more power because it makes more noise, and most people equate noise with power. My 1200 Sportster makes a lot of noise. But a 600cc sport bike with half the displacement and a stock exhaust would blow it off the road. People seem to think they can just "make more power" That doesn't say very much. Do you want high rpm power for top speed, or do you want lower rpm power for acceleration? You can't have both. Before you can even start making changes, you first have to know exactly what you want. Then, and only then, can you figure out how to go about getting it. All the changes you make have to work together. Racers are still working on how to improve that. For most car engines, once you decide what you want, you will find there is already a recipe out there for it. Once something has proven results you just copy it. No such thing exists for motorcycle engines (with the possible exception of Harley) The best thing, and by far the cheapest, is to just get a bigger bike.

I have bigger bikes. But I love the little Rebel. I ride it for fun. They also make great beginner and commuter bikes. But fast they are not.
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post #6 of 11 Old 03-20-2019, 08:32 AM
 
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"Angry Lawnmower". he he he

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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post #7 of 11 Old 03-20-2019, 09:51 PM
 
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Honda CMX 250 CM 250 cc Rebel NOS Nitrous Oxide Kit & Boost Bottle
https://www.amazon.com/Honda-Rebel-N.../dp/B01L4E4SB2

It seems to actually be this:
https://www.6sigmajetkit.com/nitrous-kits.html

I'm curious if this has any real chance of not blowing the engine up. A video would be nice if someone is actually crazy enough to try this.

2008 Rebel 250, 2014 Street Triple, 2012 Voyager 1700, 2014 FLD Switchback, 2017 Guzzi V9, 2017 Concours 14
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post #8 of 11 Old 03-20-2019, 09:59 PM
 
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Originally Posted by Lexiyntax View Post
Honda CMX 250 CM 250 cc Rebel NOS Nitrous Oxide Kit & Boost Bottle
https://www.amazon.com/Honda-Rebel-N.../dp/B01L4E4SB2
"More Peak Horsepower - Designed to gain 20% in Horsepower at Wide Open Throttle"

20%? Wow, that's...3.2HP at the crank! Somehow that doesn't seem like it will "provide a significant horsepower boost to your engine, and add performance you can feel in the seat."
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post #9 of 11 Old 03-21-2019, 09:36 AM
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So that means I could cut 20% off my two and a half hour trip to Jackson, MS on the Interstate, right? Wonder how big a bottle I'd need.

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 #10 of 11 Old 03-21-2019, 01:00 PM
 
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20cc of compressed N2O, that'll give you a boost for about a minute.
$3-$4 per recharge bottle to do it again.

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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