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Old 09-17-2012, 06:08 AM   #2026
DesmoDog
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Quote:
Originally Posted by DiabloADV View Post
Is a "plugged cat" an actual problem?

Yes, it can be. But no, I highly doubt that's an issue here. Newish cats typically plug up because the mounting mat for the substrate is eroding or the substrate is melting.

I'm going to guess that the CBR converter uses a metallic substrate, so there is no mat to erode. And I'm not sure how you could dump enough raw fuel with a single cylinder bike to melt a metallic substrate. I've run an injected twin on one cylinder for longer than I care to admit (70mph rush hour, no shoulder freeway in Michigan) and while it discolored the pipe it didn't melt the cat.

Otherwise I suppose you could be running so incredibly rich that it plugs up with soot, but I would think that would foul the spark plug long before the cat had issues.

Converters don't just plug up on their own. Something else has to go wrong first.
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Old 09-17-2012, 06:18 AM   #2027
sendler
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Quote:
Originally Posted by DesmoDog View Post
Converters don't just plug up on their own. Something else has to go wrong first.
There is probably nothing wrong with the bike. I was just half joking when I suggested that. But changing to a louder exhaust with no cat has been shown to add 9% more power so it is still a good step for him to take to try to get the little engine to do what he needs it to better.
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Old 09-17-2012, 07:45 AM   #2028
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Originally Posted by sendler View Post
Wow! Sparks are flyin'. You should also remove the noise snorkel from the inlet of your air box or leave the lid off.

Did that a long time ago.


I doubt the cat was plugged too. Glad the boat anchor is off the poor little thing.
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Old 09-17-2012, 09:41 AM   #2029
rs42sport
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How much did it weigh in at???
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Old 09-17-2012, 09:44 AM   #2030
larryboy
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16 pounds for the CBR pipe, 8 pounds for the XRR pipe, chopped and finished pipe is 7 pounds.
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Old 09-17-2012, 09:54 AM   #2031
rs42sport
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Any way to get some video of the pipe???
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Old 09-17-2012, 10:23 AM   #2032
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Any way to get some video of the pipe???

I'm on a 12 year old Mac right now, took me hours to upload the pics of the pipe...so, not now.

I've got parts together to build a new puter, give me a coupla weeks. A few of us are riding the 250's over some great roads in a couple of weeks and I'll get some video then.
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Old 09-18-2012, 02:51 AM   #2033
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We just got these in Australia as a 2013 model!

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Old 09-19-2012, 05:59 AM   #2034
rs42sport
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Any word on the pricing for 2013s??
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Old 09-19-2012, 07:47 AM   #2035
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This racer shows The effect of a pipe, fuel controller, and finally, removing the long intake runner on the power band of the CBR250R to eliminate the drooping output above 9,500.
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http://www.youtube.com/watch?v=UDmV3RDsSUw

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.
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Old 09-19-2012, 09:35 AM   #2036
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Originally Posted by sendler View Post
This racer shows The effect of a pipe, fuel controller, and finally, removing the long intake runner on the power band of the CBR250R to eliminate the drooping output above 9,500.
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.

.

Interesting, thanks!!

I can't really tell if I picked up any more power, but it feels like the blue line on that graph. A sixth gear roll on from 4k actually happens with the pipe change and it definitely zings to 9k faster than it did before.

It's been windier this week, hard to judge if the mpg's have picked up, the numbers seem the same, but I don't feel like I've been pinned as much.
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Old 09-19-2012, 11:16 AM   #2037
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I just read this from Motorcyclist Online via twitter..
#Uptospeed: New episode of on two wheels!: You’ve read about it in the magazine, now see our CBR250R long-termer... http://t.co/akhWVMcr

They're making some progress with their CBR250R..
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Old 09-19-2012, 02:00 PM   #2038
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So the black curve included getting rid of the tuned intake runner but also decking the block and head to raise compression and playing with the cam timing.
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Old 09-20-2012, 08:24 AM   #2039
rs42sport
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Quote:
Originally Posted by sendler View Post
So the black curve included getting rid of the tuned intake runner but also decking the block and head to raise compression and playing with the cam timing.
It looks like they were running racing fuel too....
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Old 09-20-2012, 09:47 AM   #2040
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That seems like an awful lot of time and money to get less than the horsepower of an unmodified Ninja 250. If you're racing in the 250 class, why on earth would you race the CBR250R?

I don't race, and I love my little CeeBee, but....
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