Suzuki GSX650F Forum - www.GSX650F.biz

My 2008 has a Scorpion exhaust can and I also received a K&N air filter from the previous owner that he had not installed because he was worried it would cause the bike to run too lean with both mods. Was this a valid concern? This is my first fuel-injected bike; on a carbureted bike, I know that you'd probably have to rejet, but what do you do when it's FI?

To get the maximum result of both components a remap would be nice. But the engine will not run lean because of these mods.

The engine won't work lean. These two are useless unless you remap ECU or install Power Commander.

Note that you don't "rejet" a fuel injected bike (no jets to change). You
"reprogram" the injectors.

You can leave the K&N off the bike, and no reprogramming is necessary.

You can install the K&N, but to get the maximum extra power output, reprogramming (from a qualified shop), or a power commander is necessary.
Both of these are expensive.

It just depends on how important the extra power is to you. Note that the K&N does let more particulate matter into your engine.

I agree about the K&N air filter. It will flow more air at a possible cost of damage to the nicasil cylinder plating.

Power gains are not easy on this bike. It was tuned for good torque and mileage, by the ECM and CAM profile.
So if you go with a power commander and get a very good tune on the engine you do or a pro shop might see a gain of MAX TWO hp.

Yet you can really fine tune some little things that will give a little more power that is dialed in.
Already with the exhaust can you dropped weight. Other ways to is front and rear wavy disks.

Next is clean up the airflow flush front turn signals. Chop or change the tail.

A low cost way as documented on the forum is change the front sprocket to 16t, around 20 clams.

Now one thing that should be noted more power or hard riding two up and or extra weight you should consider adding the Bandit 1250 oil cooler. Dehula and Kadett
Have very good write up in forum about this.

What I will be doing to get my 650 a little more kick Is add the oil cooler have the cooler now just need the hoses and union bolt. Already have Yosh r77, so just to dial in the 650 yep the 16t sprocket and Metisse G-Pack “G-pack is a module which has the capability to optimize the performance of your engine to a maximum, particularly during the phases of acceleration from low to mid range. “

“Suzuki installs the G-Pack to all bikes of the German GSX/R 1000 Cup”

“on the GSX650F it does this
Ignition Injection 2nd 2300-12500 / Ignition+Injection 3rd 2700-1250 “

G-pack is composed of an electronic box with dimensions of 45 x 45 x 16 mm. It is installed in a few minutes in between the connectors and the ignition box (CDI) of the motorcycle. On account of the compatible pins, it is connected to the original electric circuit without any changes or modifications.

US$200.00” This little goodie can be found at Wild Hair Accesories

And a big project that will flow more air is making the front faux air scoops functional a lot harder than the k & N but the correct way.
And then I will have the local shop fine tune so a little more power that will not cause poor mileage in fact better mileage should be achieved I HOPE.

If You want a lot of power You can go with a NOS system.

Good Luck

Just a follow up, little things can give give power.

A SS re usable oil filter .5 hp gain, now one that is done in drag racing AUTO
is electric water pump yes there is a electric water pump but
only bikerboy can use it is for the Busa 5 hp gain @500 DOLLARS.

Other things ceramic wheel bearings and the tire pressure.

Changing the 15 tooth to a 16 has a negative effect on performance. Acceleration suffers from the longer gearing you get. IMO not a worthwhile mod. Already thinking the 650F lacks power in top gear. So Freeway riding would mean switching gears to overtake.

You are correct Kadett i was thinking of top end speed.

And it is good so now i no need to change front sprocket

Cheers

pipe and air filter will make it run a little lean but the ECU is programed to compensate to a degree.
IMO there is no need to change the air filter as the standard one is pretty good at what it does

remap/PC/TFI etc will make best use of the mods but not absolutely needed.

there are other mods you can do (some free some not) to make this engine scream and go much better depending on what you want - more top speed or more acceleration

Remove 2nd flys
Bigger injectors
1250 ECU
headers
remove cat
loose weight
change gearing (sprockets)
TRE (or disconnect the GPS)
loose weight
plus more, you wallet will dictate what you can achieve

in reality the GSX650F is great at what it does. somewhere around 80 hp from a 650 is pretty good in my book.
if you want more HP the best thing you can do is look at another bike that makes more from the factory

Thanks guys, that's a lot of condensed notes on what upgrades to look into for small power gains.

Mostly, I was wondering what to do with this K&N that I don't really need and wanted to get a feel if it was worth installing. I'd say no as I'm happy with the power, even with a 17T front sprocket ; I also have the stock 15T and a 16T and I'm thinking of changing over to the 16T to correct the speedo. It is 5MPH+ inaccurate in the way that garners tickets with the 17T at freeway speeds and everything I read says the 16T sets the speedo correct.

Here's a question about the fuel gauge: the flashing gas pump on the LCD seems very pessimistic, but is that true for the flashing gas pump + flashing bar on the fuel gauge? It looked pretty empty when I pulled in to gas up, but I was in a hurry and it was dark. My trip meter only recorded 186.something miles for the tank, too, which seemed low considering that I was riding 80-mile roundtrips on 55MPH highways most of the week in 6th. Some of that has to be the 17T inaccuracy showing itself again, but that's a lot less than the 200+ miles I was expecting for the tank.

This and ONLY this. Just look at Biker Boy, 'wasted' 1500AUD on mods to get 10BHP gain. The 650F has the power its designed for. If you look at the gixxer 600, it has to rev to 15000rpm to gets its maximum power. Same for other 600cc race bikes. A bike as the Fazer600 has more top end power but had to sacrifice low end torque for it.

If you want more power but still the same looks/riding position, get a 1250F.

A old 1200bandit can also be fun. One dutch member has put in a GSXR750 camshafts and some other mods. Roughly 160BHP

Wasted money.....far from it.
An un-educated assumption and you are wrong.

The gains I made were worth every cent I paid. The extra Hp was only a single benefit out of many that I was
able to achieve in the performance and efficiency of the engine.

I can only hope to achieve the same result from my Hayabusa as I did with the 650F.

For YOU maybe its not wasted money (the reason I posted the word in " "), but for some people it would be alot of money just the straighten out the powercurve and a bit more power (what more benefits are there for engine tuning?). Its all a matter of perspective, and in my perspective, spending 1/6 of the bikes value into engine performance parts is not something I would consider. Getting another bike with more power to begin with would be my first thought.

And from what I can tell from this forum more guys from Aus have problems with there ECU, abrupt throttle and so on. For me, except the timing limitation on 1,2 and 3rd gear, the engine response is smooth as butter at any given rpm. Maybe I'll try the Healtech XTRE, but again, thats a $100 mod for just a little more oomph.

What are the solutions for the abrupt throttle? I've seen advice to take up slack in the throttle cables and to sync the throttlebodies but does that solve the problem or just reduce it to OEM minimum?

Give this a go hammmy

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