Honda CBR F numbers?

[jimdaworm]

Whats the difference between the F2, F3 and the F4?

[boomer]

http://www.sportrider.com/bikes/2003...onda_600_time/

[jimdaworm]

Thats wicked, thanks boomer. I was looking for just that Only one question, how much difference is there between the

"race-spec brakes" on the F4 and the F3 brakes? From what I can see they are both dual disk, although i couldnt find the size for the F3 I found the brake specs for the F4 here:
http://www.bikez.com/bike/index.php?bike=27

[Slingshot]

Thats wicked, thanks boomer. I was looking for just that Only one question, how much difference is there between the

"race-spec brakes" on the F4 and the F3 brakes? From what I can see they are both dual disk, although i couldnt find the size for the F3 I found the brake specs for the F4 here:
http://www.bikez.com/bike/index.php?bike=27

I've ridden both the F3 & the F4i and I couldn't tell any difference between the braking. In fact, I was a little disappointed with the F4i because it was so similar powerwise & in it's handling & feel to the F3.

[boomer]

I've no idea sorry Jim. Best i could find was http://pub127.ezboard.com/fhondaspor...opicID=2.topic

[boomer]

I've ridden both the F3 & the F4i and I couldn't tell any difference between the braking. In fact, I was a little disappointed with the F4i because it was so similar powerwise & in it's handling & feel to the F3.

Hey slingshot, i took a 04 600RR for a test ride last week and one of the comments i had was that the power under 6k revs was similar; I was quickly told i was daydreaming. Possible reason could have been my('99cbr's) after market exhaust giving me the impression i was going faster, compared to the stock 04's exhaust which was as quiet as. I quickly fell in love and now 'need' the 05 model

[Slingshot]

Just measured the front disks on my F3, I would say that they're exactly the same disks that are on the F4 cause they're the same size.

[gav]

But are the calipers the same?

[TwoSeven]

The F2 is the best engine of them all up to the F4i. It produces 107bhp when tuned properly (up from 89bhp). It had a steel chassis/swingarm that had just the right amount of flex in it.

The F3 was a honda disaster, it brought in ram-air but the engine was designed to use still-dead-air so this caused a bit of grief. Also, the engine was weak and couldnt be tuned properly - common problem was new engine tuners not realising the gap between the valves was so thin causing them to bugger up the porting. Also suffered from cam failures. Only good think I think they moved to fully floating discs as standard.

The F4 was the F3 with the bugs fixed - still put out roughtly the same power as an F2 but could now be tuned to about 114bhp and still be reliable (so can the F2 but it needs to run at 636cc). The alloy frame buggered up the flex that eveyone liked. This bike along with the 900 version was considered a bit fat.

The F4i got the frame right and added FI - reported claims of 120bhp from the engine - still had the same top speed as the F2 but a little more torque.

The RR to me seems nice and feels fairly balanced - the F2 done right I guess. I've heard claims of 130bhp from the tuned engine - since I dont own one cant measure it up to see if its possible but I suspect so.

Biggest thing with the cibby range (inc 250/400/600/900+/1000) is you generally have to either replace the honda shocks/brakes or mod them heavily - the componants are cheap. Good thing is that Honda UK talk to all the race teams and so do many of the aftermarket folks, so there is often plenty of information as to what needs changing for each bike.

[gav]

I hope people take note of your signature when reading your posts, dont think the F3 suffered cam failures, this was the FX or F4 model that suffered that http://home.clara.net/survivalskills/cbr600fx.htm
Or are you referring to the cam chain tensioner faults that have been part of a Honda tradition. The ram air on the F3 is a gimmicky little set up that does bugger all, and yeah, the latter F4's have a decent ram air setup. Think on the F3 it only operates up till about 30km/h and then closes a valve or something? Can't see the point of it....

[Slingshot]

The F2 is the best engine of them all up to the F4i. It produces 107bhp when tuned properly (up from 89bhp). It had a steel chassis/swingarm that had just the right amount of flex in it.

The F3 was a honda disaster, it brought in ram-air but the engine was designed to use still-dead-air so this caused a bit of grief. Also, the engine was weak and couldnt be tuned properly - common problem was new engine tuners not realising the gap between the valves was so thin causing them to bugger up the porting. Also suffered from cam failures. Only good think I think they moved to fully floating discs as standard.

The F4 was the F3 with the bugs fixed - still put out roughtly the same power as an F2 but could now be tuned to about 114bhp and still be reliable (so can the F2 but it needs to run at 636cc). The alloy frame buggered up the flex that eveyone liked. This bike along with the 900 version was considered a bit fat.

The F4i got the frame right and added FI - reported claims of 120bhp from the engine - still had the same top speed as the F2 but a little more torque.

The RR to me seems nice and feels fairly balanced - the F2 done right I guess. I've heard claims of 130bhp from the tuned engine - since I dont own one cant measure it up to see if its possible but I suspect so.

Biggest thing with the cibby range (inc 250/400/600/900+/1000) is you generally have to either replace the honda shocks/brakes or mod them heavily - the componants are cheap. Good thing is that Honda UK talk to all the race teams and so do many of the aftermarket folks, so there is often plenty of information as to what needs changing for each bike.

Interesting post, but the reality is that most people will never tune their machine beyond the all but very basic mods (ie. slip-on, air filter etc).

[ben444]

CBR600F2 in a CBR400 frame... bit of a handful... but fun

Hope to have in ChCh for racing on the 29th

[Slingshot]

Think on the F3 it only operates up till about 30km/h and then closes a valve or something? Can't see the point of it....

It has two systems, one for low speed where the pressure isn't enough to do anything, and then the ram air system.
Have a look in your air duct at the front of the bike and you'll see a couple of little round tubes, I'm pretty sure that they're the low speed intakes.

[TwoSeven]

The point really is that there isnt that much difference between the models other than cosmetics - there are certian models that you can tune the bejesus out of and ones that you cant.

THe honda silly cam chain thing (they had it right on the 250 using gears) is easliy fixed using a manual tensioner (the screw in type) as the spring on the automatic one got weak. At least they managed to move the thing to the right side where it was easier to work on (and reduced engine width).

The cam problem I heard about from some racers of the day - I suspect honda used some shoddy material that couldnt handle stress or something honderish like that.

There are a lot of good Cibby engine tuners out there, Stan stevens, TTS, Harris UK, Erv K (expensive if you can get a booking), Ten Kate (do really great value kits) - I think Erion may do 600s they were the US HRC guys for a while - most will only work on newer models, but the guys at TTS will if you ask them nicely do older models.

[aff-man]

Hmmm my 98 f3 seemed to go pretty bloody good. And with the braided lines she stopped fairly well as well. Unfortunatley I got a it of front end shudder under heavy braking ..... (might have been due to dropping the forks 18mm at the front so she tipped in like a demon )

Good solid engine that would pull from anywhere though