Do i have to RE-Jet Carb? - Honda Rebel Forum
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post #1 of 14 Old 10-05-2019, 10:43 PM Thread Starter
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Do i have to RE-Jet Carb?

I have a 2004 rebel 250 with 3k miles, and the stock exhaust is not loud enough for me....i was thinking of cutting off 7inches from the tips, after the baffles. If i do this, should i or do i have to re-jet the carb?
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post #2 of 14 Old 10-05-2019, 11:08 PM
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Welcome to the forum. No, you won't need to rejet the carb. Cutting the end off is going to lead to rust at the cut end. Far better to remove a baffle or two (there are three baffles) IMO. This thread explains how to do it: https://www.hondarebelforum.com/f76/...val-53578.html

Please don't make duplicate threads on the same subject. It won't get an answer any quicker, and can be irritating to respond to one thread, only to find someone else has already done so in the second thread.

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

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post #3 of 14 Old 10-05-2019, 11:17 PM Thread Starter
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I was going to cut like this video here:

https://youtu.be/bUpeDvDZ6TM
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post #4 of 14 Old 10-05-2019, 11:52 PM
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That should be ok.

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 #5 of 14 Old 10-06-2019, 12:17 AM
 
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Use caution when modifying the exhaust on a Honda Rebel.


There have been reports of power loss due to lean conditions caused by the change in back pressure. I've read about people experiencing erratic throttle behavior at cruising speeds as well.



In theory you should be fine if you don't modify the air-box as well.



I made a how to guide for baffle removal in my thread. https://www.hondarebelforum.com/f18/...-121909-2.html


I would like to add its pretty cool for a few miles while accelerating through the first three gears, but it gets kind of annoying when you goose it at speed. It kind of has a drone to it, with only a gradual increase in rpm once at faster speeds.

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post #6 of 14 Old 10-06-2019, 08:13 AM
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"It's never going to sound like a Harley" and "Sounds like a pissed off lawn mower" have been used to describe the modified Rebel exhaust. If you have your heart set on louder and more rumble (such as it is) buy some aftermarket Jardine pipes made for the Rebel. If you ever plan to sell the Rebel, having a stock exhaust is going to make the bike more salable.

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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Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #7 of 14 Old 10-06-2019, 08:25 AM
 
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Exactly. Like the guy on youtube said," it used to sound like a sewing machine, now it sounds like a pissed off sewing machine." That couldn't be more true.


As for the Jardine pipes, does anyone have a picture of the left side of the bike? No one ever shows that side after installing them.

1970 CT90
1986XL600R
2001 KE100
2002 Honda Rebel
I'll buy a Harley someday
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post #8 of 14 Old 10-06-2019, 06:08 PM
 
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Quote:
Originally Posted by Jay_bone View Post
I have a 2004 rebel 250 with 3k miles, and the stock exhaust is not loud enough for me....i was thinking of cutting off 7inches from the tips, after the baffles. If i do this, should i or do i have to re-jet the carb?
If you're looking for an angled cut look, then do it. I would step up to a larger jet size myself afterwards tho. My straight pipes on the 250 sound mean. Trick is to cut em way up before the crossover tube to get the larger diameter sound out of them.

1986 Rebel CMX250
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post #9 of 14 Old 10-07-2019, 05:34 AM
 
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Cutting the stock mufflers in half results in the worst possible sound you can produce on these bikes...unless of course you happen to think that a pair of dueling chainsaws in dire need of maintenance is a good sound. For the rest of the world, it both looks and sounds like crap.

I bought my second Rebel "modified" as such and the first thing I did was cut the rest of the muffler off and mate some universal mufflers to the head pipe.

I hole-sawed the rear baffles out of another and that had a nice note to it too.

No matter what route you opt for, rejetting doesn't become an issue until you alter the intake...although cutting off too much exhaust will ruin your valves and the only fix for that is restoring some semblance of exhaust volume (cubic space, not sound level). BTW, that same cubic space will define the high or low pitch you may be seeking, more space yields a lower tone and less space yields a higher tone...think of it as a pair of soda bottles, one filled 3/4 full of water and the other filled 1/4 full. Blow across the tops, the one with more air space has a lower note.

"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 #10 of 14 Old 10-07-2019, 10:30 AM
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And once the valves are ruined, the only fix for that is replacement. Removing the mufflers also eliminates the support where they attach to the frame. This eventually leads to the combination of unsupported weight and vibration breaking the exhaust studs.

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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