B1200 vs B1250

Hey Riders,

Those of us who ride B12's will probably know that the engine starts to kick from 6000rpm and up. By that I mean if you are in or slightly above that rpm and you grab a fist full of throttle it will haul. Or if you do the same but at say 5,000rpm you will notice a power band once you reach 6K+. Front wheel gets really light or even comes away - feels good when you're expecting it to happen.

Now on my 1250FA I'm not finding any real kick. It has K&N, Healtech FI tuner, X-TRE, Two Bros slip on. Torque down low and mid is excellent and I would say superior to the B12 in that department.
Up the higher end it's just not there. Reason I bring this up is today I hit the rev limiter totally by accident whilst waiting for the power to come on. Yes it powered away but not like my B12 with a poor mans stage 1 (jets, needle adjustment, K&N, slipon and 1.5" hole in the airbox lid).

Am I comparing apples with apples or have I got it all wrong and the FA is just in need of a set of Yoshimura cams?

Summing it up, I'm feeling a bit dissapointed in my FA when I compare it with my old K6 B12.

A penny for your thoughts.

Hmmmmmm not really worth it are they?
$1000 for the cams then all the arse clowning around fitting and tuning.

Maybe on the 12.5 you are waiting for that kick at about 5-6 but it doesn't come because it is masked by the extra tork in the low/mid range that the 12 hasn't got.

If I did go down the Yoshi ($1000) cams path. I'd be paying a someone to find out why that f*%#ing dip is always there...

dhula wrote:Maybe on the 12.5 you are waiting for that kick at about 5-6 but it doesn't come because it is masked by the extra tork in the low/mid range that the 12 hasn't got.

You may have a point, with the original motor in the B12 ( the one that lifted the front wheel in third at 9,000 RPM) out near Millborodale, Cameron and some of his mates from NSW riders (on full on sports bikes) took off from a re-group stop and the B12 was equal with him until about $1.40 after which I lost interest.

Reardo wrote:If I did go down the Yoshi ($1000) cams path. I'd be paying a someone to find out why that f*%#ing dip is always there...

I think the B1250 is hamstrung by small throttle bodies as much as anything. The stock cam would be good for a lot more ponies if you could feed it fuel.

Like we have said the 1250 went touring .

gus wrote:Like we have said the 1250 went touring .

Performance wise they have the same numbers.
The longer swing arm on the K6 + killed the hoon image.
The way the B1250 make it's power was part of the reason i got bored with it.
How many of us ride the B1250 much harder after a few years? I do.

It's easy drop a tooth on the front and get a set of arrow headers mine wheelstands piece of piss and the axle is back at the end of the blocks due to the 17 tooth front with stock chain. The 1250 runs an 18 on the front stock whilst the 1200 runs a 15.

reddog wrote:It's easy drop a tooth on the front and get a set of arrow headers mine wheelstands piece of piss and the axle is back at the end of the blocks due to the 17 tooth front with stock chain. The 1250 runs an 18 on the front stock whilst the 1200 runs a 15.

What do you do with 1st gear after doing that RD?

launches

I can't remember who said it before, but think they were right. If the Bandit pulled 12-14000rpm then it would need bigger TBs.

I like Reddogs idea with a sprocket change .
My Aprilia had 2 go bits .One at 5,ooo and another at 7,500 and i loved the anticipation of it .Then i realised it had 2 flat sections one at 4,000 and
thats right 6,500 revs .I re chiped it ($80) and now its one smooth power curve . I miss the "rush " but i'm actually going faster .The Aprilia was geared
to go into 5 th gear at 140 kph . 6 speed box . I could ride all day any only use 4 . Changed front and rear sprockets .
Could it be the 1200 has a flat spot before "take off "
I had a 1200 (ist one )and do prefer that motor though .

Ive been riding the Triumph Bonn . (2006) to work every day ,70 round trip . On the highway 105 kph the motor felt "sweet " .Any faster the
motor felt strained . It has 65,000 kls on the clock mostly done buy Carol on interstate trips .WE changed the front sprocket to one more tooth on the front .What a differance ,120 kph now feels sweet on the highway .Its like having another gear .
Even Carol said "thats fantastic " .All for $27
I tend to use my Bandit for touring (well that was the idea ).
You know i'm going to try a smaller front sprocket myself and if a tour appears refit the standard sprocket .(who would like to be a chain )

I've been happy with the gearing on the FA thus far. It's just the top end which sadly isn't there after 7,000rpm.
Since very few peeps are using the Healtech FI Tuner I'm in uncharted territory WRT maps. I've got the downloadable one which has a fair bit of additional fuel. Just broke out the hole saw and cut a 2" hole in the top of the box. Will take her for a run thismorning to see what that does.

Have you removed the secondaries. Mine use to die from 7000 onwards but after removing
The secondaries and holes in the air filter lid , she pulls hard all the way to redline

4wa I do ride my bandit a lot harder then I did when I first bought her

Well took her for a ride with an additional 2" hole in the top of the airbox. First thing, induction noise is more noticeable.
If anything the low and midrange torque feels stronger. 7,000rpm and up still dies in the arse.

Do you loose anything in torque in the low/mid range if you remove these butterflies?

I'll have to do a search and read up as I'm hesitant to do this mod. Dale Walker seems to swear by getting rid of them.

That redline is there as a stop point - I want to be able to use 7,000 - 9,000rpm range - I paid for that range Not that you use this area much, it's just good to know there is power there if you want to reach up and get it.

Tried something different for a change - altered my mindset from trying to ride it as a sports bike and adopted a tourer style. Funny thing, in that mode it is actually a bloody good ride.

The only thing i have noticed by removing the secondaries is a slight loss of engine breaking.

The performance increase and responsiveness of the throttle are well and trully worth removing them

Agree with H. get rid of them . Bike feels a lot more alive

these are two different engines, the 1200 is a detuned gsxr engine,and the 1250 was designed purely for the newer bandit with torque in mind

holdenman wrote:The only thing i have noticed by removing the secondaries is a slight loss of engine breaking.

The performance increase and responsiveness of the throttle are well and trully worth removing them

+1

For me, improved responsiveness and a little freer up top.
Feel more like a rider, Not a passenger to the secondaries.

Study Dale Walkers dyno graphs for the 'flies out and the graph for the Yoshi cams earlier in this thread - see anything similar?
1 costs $1000 for the parts the other costs your time and maybe a screwdriver.

I'm thinking about doing the removal but I'll have to wait until the next oil change. Pulling the FA fairings off is a PITA.

mtbeerwah wrote:these are two different engines, the 1200 is a detuned gsxr engine,and the 1250 was designed purely for the newer bandit with torque in mind

Show me a GSXR1200

He is on the right track. The 1200 engine is a gsxr 1100 engine that has been bored out and received milder cams for more low/ midrange power

what he said for those who have no idear, the 1200 is a 1157,and the 1100 gsxr is a 1127. it has been the same format since late 80`s, hence the term detuned. for those that are sceptic,do some research,you might learn something