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Discussion Starter #1
Hello to all my CBR 250 brothers ! Use to be into modifying the CBR 150, now its time to play around with the CBR 250, hope to discover and share lots of modification ideas with the new bike.

This forums great !
 

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Welcome JetSet! Good to hear that you're into modifying the CBR. It'll be good if you can share some of your mods here.
It'll be of great help to those who are thinking of improving the performance of their CBRs.

Cheers!
Sudeep
 

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Hey welcome to the club. Do post some pics and posts about the modifications you have done. Hope to do the good ones here in India too.
 

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Man its just crazy we can talk to people all over the world about this bike. How long have the CBRs been available in Thailand, since thats where theyre made?
 

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Discussion Starter #5
Hey fellas ! yeah its great to be be able to meet people from around the world with the same bikes.

My previous bike was the 4 valve CBR 150, it was bored out and had the stroke lengthened by 3mm, carb was bored out to 31mm, intake and exhaust ports were polished, higher compression, cylinder spacers, copper gaskets and had stage 2 racing cams, race cdi, stiffer clutch springs for better bite and a copper clutch, and i made a custom exhaust and silencer. It was hitting low 14's in the 1/4 mile. Couldve went faster , but it was my daily driver !

The bikes been available for about a month or two now and there's already people tearing into them seeing what makes it tick, first thing im going to do is see if i can give it a deeper tone, my MIG is going to be busy !

Cant wait to see what the CBR 250 is capable of once the racing cam comes out....must go 200 kph ;)
 

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Hey fellas ! yeah its great to be be able to meet people from around the world with the same bikes.

My previous bike was the 4 valve CBR 150, it was bored out and had the stroke lengthened by 3mm, carb was bored out to 31mm, intake and exhaust ports were polished, higher compression, cylinder spacers, copper gaskets and had stage 2 racing cams, race cdi, stiffer clutch springs for better bite and a copper clutch, and i made a custom exhaust and silencer. It was hitting low 14's in the 1/4 mile. Couldve went faster , but it was my daily driver !

The bikes been available for about a month or two now and there's already people tearing into them seeing what makes it tick, first thing im going to do is see if i can give it a deeper tone, my MIG is going to be busy !

Cant wait to see what the CBR 250 is capable of once the racing cam comes out....must go 200 kph ;)
wow, your 150 goes better than the 250...this should be good.:rolleyes:
 

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Discussion Starter #8
What do you think is possible to do with the 250 engine for more HP? Big bore kit?
Right now or in the future? cams, crankpins, internal gears and cdis are still being developed so its still a bit limited for the hardcore mods.

For right now, probably the most effective mod would be a higher compression piston, and bigger valves, intake and exhaust polished, edges smoothed. NGK needle plugs would help with throttle response and if the cbr 250 is like the cbr 150 there is a resistor inside the sparkplug boot that can be removed, that allows the spark to be more powerful. That resistor is there only to cut down on ignition noise to the surrounding environment.
Aftermarket sparkplug boots simply leave out the resistor and use a more conductive element.

I have to check and see if there is an air injection valve in the exhaust system, the 150 has one for cleaner emissions, plug that up and get some low end out of it. When you plug that up it sounds like a mini turbo.

As for exhaust, i'd stay away from all exhaust for right now. Almost all the carbon fiber silencers that ive seen are coming from China and use the wrong resin type as well using an inner diameter that is too large for a single cylinder. Until someone comes up with a chambered design, there wont be any gains because of less output velocity. You'll be louder but not faster !
 
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