CBR250 mufflers dont fit straight on. - Honda CBR 300 Forum
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post #1 of 14 Old 10-07-2014, 06:21 AM Thread Starter
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CBR250 mufflers dont fit straight on.

I picked up my new 300 on Friday and after a long 500km run home to evaluate and run in the engine a bit I was ready to slip on the Delkevic carbon muffler I had on my CBR250. (despite the press blurb the new muffler still sounds like a cross between a leaf blower and a farm quad bike)
But alas they have lengthened the header pipe by about 100mm so its not a straight forward fitting job.
Unless you can find a shorter linking pipe with the right angles (unlikely) the easiest way around it is to cut the pipe shorter using a cutting disc in an angle grinder. Sounds like a harsh thing to do to a new bike but it worked and you can do it with the header pipe on the bike (make sure you angle the sparks in the direction of the floor) as this holds the pipe firm for you while you cut it. Remove the right hand lower belly fairing first tho.

I love the extra passing power of the 300 but it's not as smooth as my 250 engine was. Once I get to 6000rpm an annoying vibration sets in through the pegs, seat and bars to a lesser extent. Unless I just got a badly balanced motor perhaps. Would be keen to hear other peoples thoughts who have owned both engine sizes.

2014 CBR300 (sold)
2018 Ninja 400

Last edited by kiwi rider; 10-07-2014 at 06:23 AM.
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post #2 of 14 Old 10-09-2014, 02:39 PM
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Interesting, @kiwi rider how does she feel/sound now with the Delkevic installed?



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post #3 of 14 Old 10-09-2014, 05:10 PM
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Would love to see a picture of what you've done with the exhaust. I would be afraid to start cutting things off of my bike, but maybe that's just because I haven't looked into it much at the moment.

I would probably just go with an exhaust that is made specifically for the CBR300. Seems easier, but its good to have this info here for people who have a CBR250.
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post #4 of 14 Old 10-09-2014, 05:46 PM
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Have you contacted your dealer about the vibrations you're feeling when riding?
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post #5 of 14 Old 10-09-2014, 05:58 PM
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Originally Posted by Late Shift View Post
Would love to see a picture of what you've done with the exhaust. I would be afraid to start cutting things off of my bike, but maybe that's just because I haven't looked into it much at the moment.

I would probably just go with an exhaust that is made specifically for the CBR300. Seems easier, but its good to have this info here for people who have a CBR250.
Same. Would love to see pics. Problem with getting cbr300 specific parts is just that there really aren't that many out at the moment.
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post #6 of 14 Old 10-10-2014, 05:31 AM Thread Starter
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Just the same after fitting the Delkevic but it sounds heaps better and with the k & N air filter it snaps off the mark real smartly when given a burst of throttle.
I wasn't particularly surprised that the 300 had more vibes than the 250 as its a stroked version of an existing design rather than a motor designed with a clean sheet of paper. A longer stroke equals a higher physical force to be counter balanced etc.

Its not unbearable tho or worth going to the dealer about, just an observation and I'm sure if you bought the bike without having owned a CBR250 beforehand it would go mostly unnoticed. My 250 had a sweet motor that spun real nicely and loved to rev

Having said all of that, I read your posting about the breaking in procedure and even tho I've missed the 20 mile window i'm gonna go out tomorrow on a 200mile twisty road and give it ****!

Will try to upload a photo in next day or two, I think i have some notes saved on how to do it from Moto Mike or someone in the know.

Another observation on the 300 vs 250: Even tho it has a 36 tooth rear sprocket instead of a 38 it still reads exactly 6000rpm at 100kph (60mph) in top gear like the 250 did. So its really under geared IMO and I'm putting the 15 tooth front sprocket on tomorrow.
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Last edited by kiwi rider; 10-10-2014 at 05:41 AM.
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post #7 of 14 Old 10-10-2014, 06:56 PM
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If I'm remembering correctly weren't there also some vibing issues with the 250 as well. Or was that a rattle instead???



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post #8 of 14 Old 10-11-2014, 07:26 AM Thread Starter
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Nope, no bad vibes with my 250, cant speak for others tho. You could sit on 80MPH hour pretty much vibe free even tho it was sure revvin.

2014 CBR300 (sold)
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post #9 of 14 Old 10-12-2014, 05:49 AM Thread Starter
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[attach]Attachment 498[/attach]

2014 CBR300 (sold)
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post #10 of 14 Old 01-13-2015, 09:11 PM
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The vibrations on my CBR300R at 6000rpm seem to be more apparent after it's first service (@1000kms) - any thoughts on why this might be?

I have only been riding for a month (so forgive me if this seems odd) but it was significant enough for me to notice on my first ride after the service.
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