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post #21 of 106 Old 11-05-2012, 11:16 AM
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Quote:
Originally Posted by Aufitt View Post

Non Oring chain and 13T front.

Changing the front sprocket.

Easy 2nd gear wheelies and gets the bike working as it should have come from the factory.

Cost $75.
I, of course, am still improving as a rider, so may not do this just yet, but I am curious about the non-oring chain...are you replacing it for weight, for some other performance reason or because it won't work with the 13T?

Thanks!

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CBR 250r Black/Black (wife's)


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post #22 of 106 Old 11-05-2012, 11:28 AM Thread Starter
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Quote:
Originally Posted by Empty Sea View Post
I, of course, am still improving as a rider, so may not do this just yet, but I am curious about the non-oring chain...are you replacing it for weight, for some other performance reason or because it won't work with the 13T?

Thanks!
Simply less rolling resistance, its an old 125cc 2 stroke MX trick

There is a HP lost right there with an Oring chain,
if anyone does not believe me, try and spin your rear wheel on the stand.
Then spin a bike with a non Oring chain.

remember we only have 23 precious HP to play with so everything counts.

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post #23 of 106 Old 11-05-2012, 11:52 AM
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Thanks for these.
Any perceived loss of midrange power after grinding the exhaust header collar smooth?
Also I'd be interested in your thoughts on tyre choice please?
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post #24 of 106 Old 11-05-2012, 12:29 PM
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If I were to change the sprocket, grind down (what I assume is) the opening to the header, but not change the muffler or the o-ring chain, would I get a significant performance boost? If so, at what cost? Fuel economy? Increased engine strain? Are there other negative side effects? I don't have the money for a slip-on right now, so these lower cost mods have appeal to me. I just don't want to screw up my bike in the process.

I do NOT want to derail this thread, so please only reply to my questions if you have actually performed the mods I am thinking of doing. Thanks in advance!

CBR 250r Red/Silver (mine)
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post #25 of 106 Old 11-05-2012, 12:46 PM
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Quote:
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Want 20mm higher rearsets to help that grinding feeling you get every corner?
just remove the bobbly bits from the pegs.

Well it still grinds, but the pegs fold up and you wont end up on your ass like fixed rearsets do.

Cost $0.
The nice thing about this mod is that every time you scrape your pegs they get lighter!

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post #26 of 106 Old 11-05-2012, 02:59 PM
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I am replying to this just so I can refer to it later. I want to do them all!

"Is that a bicycle attached to the back of your CBR? Brilliant!" -- markfourismore
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post #27 of 106 Old 11-06-2012, 02:54 AM
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post #28 of 106 Old 11-06-2012, 03:20 AM
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Someone sticky this thread...

Top work Aufitt.
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post #29 of 106 Old 11-06-2012, 04:55 AM
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Quote:
Originally Posted by Aufitt View Post
Simply less rolling resistance, its an old 125cc 2 stroke MX trick

There is a HP lost right there with an Oring chain,
if anyone does not believe me, try and spin your rear wheel on the stand.
Then spin a bike with a non Oring chain.

remember we only have 23 precious HP to play with so everything counts.
Are there any downsides to using a non-O-Ring chain? Does it need more maintenance or more frequent change intervals?

Mazda 2006 SP23
Honda 2012 CBR 250R (ABS)

http://www.fuelly.com/driver/mrshadow/cbr250r (Fuel Mileage)
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post #30 of 106 Old 11-06-2012, 06:37 AM
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Roughly added together, you have shaved off about 25 lbs

Very nice thread, and although I need alot of that stuff to stay legal on the street, you have given us some good ideas of how to get the most out of this bike.
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