How is a hornet different from a CBR?

[5v3d3b0]

They claim that the hornet carries the same engine as the CBR 600RR, but it's "detuned"
What does that actually mean? Do they just make it a little shitty on purpose?
Or is it something to do with the FI system?

[Blackwolf]

I guess there will be different ECU mapping and that the gear box will be different. But thats only a guess.
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[mad4it028]

just a guess ide say cams carbs/injectors? and ecu exhaust

but it is just a guess
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[veeeffarr]

One is a girls bike

[Kickstart]

Hi

Normally an engine is detuned with different carbs / throttle bodies, different cams, maybe a heavier crank, lower compression, smaller valves, different design of exhaust, etc.

General idea is to loose some some top end and gain some mid range power.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[TUG]

[chris-red]

My Speed Four is exactly the same as the TT600 (The sports bike version) apart from plastics the cams and the injection mapping.
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[veeeffarr]

[TUG]

[69.9mph]

[Kal]

[Madmanx]

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[colin1]

while tt600 and speed four have the same spec suspension and frame, most naked bikes based on a sports bike have lower spec suspension

the speed four is unusual, as its only the engine set up which is different

i suspect that the hornet has lower spec suspension than a cbr600rr and obviously the frame will be different so it wont handle as well
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[Itchy]

Hornet type frame

https://www.diseno-art.com/images/backbone_frame.jpg


Twin Spar type (R1) frame.

https://www.diseno-art.com/images/YZF_R1_frame.jpg

Hornet frames are kinda weak, I've seen plenty of them crack at the steering head when crashed lightly.
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[5v3d3b0]

A few questions:
What are cams?

So would you have to change injection, ECU, frame, exhaust, and suspension to make a hornet a cbr?
Just out if interest, I'm not gonna try

[Kickstart]

Hi

A cam in this context is the shaft that carries the eccentric lobes that operate the valves.

As to changing a CBR to a Hornet. Yes you would change most of it (and probably much of the engine as well).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Blau Zedong]

[mad4it028]

would probally be cheaper to just put a cbr engine init rather than up grade the hornet engine

theres always cbr engines on ebay
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[Kickstart]

Hi

Not certain the CBR engine would fit. Possible the inlets are at different angles, for example.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Timmeh]

The old Hornets have the CBR600F2's engine, gearbox and front forks. The swingarm is virtually the same but it is half an inch wider, as the hornet has a 5.5" rear wheras the 600F2 has a 5". The ratios have also been widened a bit, especially 1st and 2nd which aren't quite as tall as the CBR's.

Some of the ancilliary kit (like levers and switches) are the same.

I believe they share the same brake components.
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