Internal engine modifications - Honda CBR 300 Forum
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post #1 of 5 Old 05-15-2019, 10:59 AM Thread Starter
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Internal engine modifications

Post any aftermarket parts you know of, please!

Crower cams - https://danielcrowerracing.com/i-905...t-2011-18.html

42mm TB - https://www.steadygarage.com/store/t...300r-rebel-300

Aftermarket ECU - https://www.steadygarage.com/store/t...ntroller-tuner

I know the 3rd one isn't an internal mod, but I haven't seen anything like it. All other fuel tuners piggyback onto the OEM ECU, so this is interesting.

Is there anything else unique out there, like a piston made specifically for 300s?
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post #2 of 5 Old 05-16-2019, 02:12 PM
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Nice post.... thanks. Although I question the cost of doing these mods and others..over the cost of just trading and getting a different size/make of bike. But I know some love to tinker.
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post #3 of 5 Old 05-16-2019, 04:38 PM
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Originally Posted by CDNHONDAR View Post
Nice post.... thanks. Although I question the cost of doing these mods and others..over the cost of just trading and getting a different size/make of bike. But I know some love to tinker.
I've always said that there are a number of factors to consider, aside from the relatively high $$ cost for what amount to small power gains, when contemplating internal engine modifications.

An obvious one is to what extent will reliability be affected? Or better, how much am I willing to sacrifice reliability based on my intended use for the vehicle, such as everyday riding.

Drivability is another... will I sacrifice too much of the low & mid range power/torque for a HP gain at the top of the power band?

Given that increasing the engines compression ratio, along with timing & fuel ratio adjustments is often the easiest way to more power, the octane level of the gasoline will also become a factor. Tweek an engine far enough in search for HP and premium grade pump gas won't cut it. That's when $10 to $15 per gallon for race gas from VP or Sunoco becomes another ongoing cost factor.
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post #4 of 5 Old 05-16-2019, 06:25 PM
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I gained four RWHP by fitting an aftermarket slip on to my Ninja and then changed the fuel maps to suit that pipe by flashing the ECU. We also tweaked the ignition map too.
All up it cost me $1600 NZD ($1030 USD) so $400 per horse power!
As someone who changes bikes regularly I'm not prepared to chuck any more money at engine HP gain mods now.
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post #5 of 5 Old 05-18-2019, 09:00 PM
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Quote:
Originally Posted by CDNHONDAR View Post
Nice post.... thanks. Although I question the cost of doing these mods and others..over the cost of just trading and getting a different size/make of bike. But I know some love to tinker.

Yeah, pretty much I'm done with mods after the Akra slipon, racetech springs and R6 shock mod (i2i and stroke length are very similar and it's pretty much a direct bolt on without having to spend Ohlins or Nitron money). I'm going to ride this bike until I *really* feel the need to get something else (CC-itis is a real disease just like Parked Motorcycle Syndrome in the wintertime).

Like MotoMike says, why spend money and tinker with reliability when you can just get something else from the factory that's not only reliable but cheaper than doing janky mods. I'm still super excited to potentially pick up a CRF450 (my grail bike) but with that said I am really liking the CB650 Hornet and at $9K CAD for a brand new one off the floor it's much better than messing around with suspension, ECU's, intakes, exhausts, etc.

READY TO >> RACE
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