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View Full Version : K5 vs 07 750 comparison....



Rumblestrip
07-05-2007, 10:48 PM
First thanks for creating this forum, the site needed it :ayyy:

Below is a little (long...sorry) review/comparo write up on the 750 vs K5/K6 I posted over at GDC.

OK, so I have put down around 2500 km on the new 750 on all sorts of roads and thought I'd post up what I think of it compared to a stock K5.

I need to set the correct sag on the 750 cause I think it is a tad soft for me (195 lbs with full gear).

The bike handles very similar to the K5 IMO. It likes that you lean over the tank when cornering as did the K5.
Obviously the 750 steers quicker.

Brakes are equally good.

For looks it is simply the most beautiful sports bike ever made. It is so nice and narrow and any other bike looks like a snowplough in comparison (ref: R6 etc.....)

Front end on the 750 feels better out of the crate, but don't like that it has turns instead of clicks on the adjustments. Easier to keep track of clicks IMO, but this is not a big deal.
Rear shock equally good to the K5.

I terms of power we all know it can't compete with the magnificent engine of the K5, but the 750 has this beautiful useable power curve. Riding at high revs in 3rd gear corners is just so fun on this bike. Getting on the throttle coming out of turns is more fearless and gives it a certain 'trash' factor.
I have clocked an indicated top speed of 289 km/h and even if it lacks the raw acceleration of the liter bike it has all the power I need......and decent torque to compared to 600's

For ergonomics I like the 750 a little better ( I am at 180cm height) When in 'race' position it is very easy to feel comfortable on the bike. My arm will quickly lay to rest on the tank and with the stomp grip it is very easy to let go of the death grip on the bars.

Clutch is excellent and none of the K5 issues so far.

If there is one area the K5 outshines the 750 it is on fuelling. OK, anywhere above 6000 rpm the 750 is the smoothest I have ever ridden and I would call it creamy.........it's wonderful, but the bike has a serious problem in lower revs.
I also think there is a problem with my bike as well as many others (ref: herky/jerky throttle threads in the 600/750 forum). If you don't start the bike in neutral it is just horrible with a very on/off throttle and an engine that doesn't run clean at all. Sounds almost like misfiring in lower revs.
But above all, when it runs smooth it still has a hesitation coming on throttle anywhere below 6000 rpm and when trying to set an 'entry throttle' in slow speed corners it very easely dips in to decell fuel cut off. It is VERY annoying and I'll give an arm or a leg if anyone would come up with an idea on how to fix this. Taking this issue up with the Korean dealer is waste of time.

To be honest I am very dissapointed, because out of the 8 Suzukis I have owned this is the first time I have had a problem.

If this is a ECU related thing I'll go EM Pro when taking it to the track next year or wait and see what Suzuki has in store for 2008.

Conclusion:

The 750 will do excactly what you want it to do and it feels more stabel than the K5. The K5 was also awesome in the twisties, but the 750 will do everything with more ease to it. Flicking it through ss's is a dream.
But because of the fuelling/throttle response issue on the 750, owning a new K5 was amore thrilling experience and over all a better bike IMHO.

Kat00
07-05-2007, 11:43 PM
G`Day Nave, good write up mate.
Stock pipe on that bike?
I had a K4 750, and had similar hesitation problems, albeit at lower revs than the ones you state.
Put a yosh slipon on it and it improved it a bit.
Put a PC3 and custom mapped it and presto, silky smooth delivery.
I went the same route with the first K5, not that it needed it, but that was a complete waste of money., the dip that was evident at about 5000RPM disapeared with the slipon alone, the K5 simply didn`t need the PC.
The difference the PC and the mapping made on the 750 was night & day.
Might be worth a try mate.
Keep us informed.:ayyy:

Rumblestrip
08-05-2007, 09:14 AM
Thanks Mick,

Custom map here in Korea :( ...........they wouldn't know what I am talking about :headshake:

The instructors riding the 750 at PI are reporting similar hesitation problems and it is interesting you say you had on the 04 as well.

I'm gonna live with it this summer and see what Suzuki has in store for 2008, hence no major mods to the 750........at least I'll try not to :lmao:

quickchick
08-05-2007, 07:57 PM
Thanks for that Rumblestrip. Interesting read.

dilbee
08-05-2007, 11:48 PM
Mine feels fine bar around 2-3k mark on the throttle. My top speed ive had is the same as you but ive still had a little more i could of still gone. But i guess im small and light too. :) Ive found my ride a little firm but thats because im so light. Little 125 ridder i should be. haha