For anyone that hasn't looked at their fuel system in while...

[clean]

Hi everyone,

Some of you may already be familiar with this, but I Just thought I would share as it may help someone.

I bought my 2008 gen 2 a couple years ago. I've always been mostly satisfied with its performance. Recently I wanted a bit more out of it so I sent my ECU off for a standard mail in flash. When the ECU came back there was maybe a little better rideability down low, but no major improvements.

Also since getting the ECU back I noticed a strange holding back somewhat hesitation in high RPM / high fuel demand running. I instantly thought it was the fuel pump getting tired, and had remembered reading something about the busa fuel pumps getting tired awhile back.

anyway got on searching and came across the fuel filter mod. Up until this point I wasn't even aware that there was a filter in the tank (aside from the pickup screen).

Sure enough mine was totally plugged. I did the mod (drill hole bypass) and also added a new bosch 69420 fuel pump.

All I can say is WOW. I must have picked up at least 25HP in the top end. the bike is all crazy front wheel in the air at 80MPH etc. A total night and day difference.

If you haven't looked at your filter/pump I would definitely recommend it - I have a totally different bike. Thanks a million @chrisjp

 

[BlueBacon]

Hi everyone,

Some of you may already be familiar with this, but I Just thought I would share as it may help someone.

I bought my 2008 gen 2 a couple years ago. I've always been mostly satisfied with its performance. Recently I wanted a bit more out of it so I sent my ECU off for a standard mail in flash. When the ECU came back there was maybe a little better rideability down low, but no major improvements.

Also since getting the ECU back I noticed a strange holding back somewhat hesitation in high RPM / high fuel demand running. I instantly thought it was the fuel pump getting tired, and had remembered reading something about the busa fuel pumps getting tired awhile back.

anyway got on searching and came across the fuel filter mod. Up until this point I wasn't even aware that there was a filter in the tank (aside from the pickup screen).

Sure enough mine was totally plugged. I did the mod (drill hole bypass) and also added a new bosch 69420 fuel pump.

All I can say is WOW. I must have picked up at least 25HP in the top end. the bike is all crazy front wheel in the air at 80MPH etc. A total night and day difference.

If you haven't looked at your filter/pump I would definitely recommend it - I have a totally different bike. Thanks a million @chrisjp

I replace my 4-wheeled vehicle's fuel filter fairly regularly. My busa is 18yrs old and I don't think anything in the tank has been touched might look into it next winter cuz I know that thing has to be nasty

 

[Kiwi Rider]

Y'know, it amazes me how soooooo many bikes' maintenance schedules are ignored and the bike just gets ridden . . . . A LOT!
Busas have an appetite consumable items such as air filters, oil filters, FUEL filters, tyres, chains and sprockets, BRAKE and CLUTCH fluid, FORK oil, brake pads etc etc.
Yet so many owners just neglect their bikes and then wonder why they have issues with power loss etc etc.
In the 7 years I've owned my '99 Busa, and the 70,000kms I've ridden on it, I have kept a log on everything I've done to my bike . . and I mean EVERY thing.
I have a huge amount of entries into this log, and when I added the cost, it was more than I paid for the bike.
BUT . . . my Busa runs perfectly EVERY time I ride it and it's never let me down.
It has 144,000kms on the clock and still runs sweet.
Moral of the story . . . maintain the machine and look at it as a labor of love!

 

[Mythos]

How many miles did your 08 have when you did the fuel filter mod?

 

[E Zurcher]

Surprisingly, the owner's or service manual for Gen 2s don't show the filter as a regular time changed item. Service manual has you change it when there is a performance issue through troubleshooting.

This is why there are so many threads about the motor falling on its face at higher rpm. almost always the fuel filter being clogged. All it takes is one bad tank of gas. If you begin to hear a higher pitched whining sound from the tank louder than usual, it's probably just the filter. The filter medium is very small. When they clog, no amount of fuel cleaner or back flushing will make a difference for very long. When pumps fail they usually just die. Filter replacement is an expensive proposition, the fuel filter mod is a good way around it for sure and allows a fresh filter every couple of years.

 

[SSGT_B]

Y’all quit giving me more things to do!!!!! Lol

my 06 don’t run bad or have any of those issues but I might do it just for giggles. I have almost 50K miles on it.

 

[clean]

How many miles did your 08 have when you did the fuel filter mod?

26,000. it ran basically fine before just lacked power in the top end ( almost not enough of a problem to even notice). now it runs better over the entire rev range, and is INSANE in the upper registers - the bike is a total beast now. With the mod ( external filter, fuel line and clamps) and new pump (bosch 69420) it cost me about $160 CAD. best money I have ever spent. Suzuki wants 400 CAD alone for that overpriced piece of plastic they call a filter.

 

[clean]

Y’all quit giving me more things to do!!!!! Lol

my 06 don’t run bad or have any of those issues but I might do it just for giggles. I have almost 50K miles on it.

I think you'll be surprised!

 

[clean]

Surprisingly, the owner's or service manual for Gen 2s don't show the filter as a regular time changed item. Service manual has you change it when there is a performance issue through troubleshooting.

This is why there are so many threads about the motor falling on its face at higher rpm. almost always the fuel filter being clogged. All it takes is one bad tank of gas. If you begin to hear a higher pitched whining sound from the tank louder than usual, it's probably just the filter. The filter medium is very small. When they clog, no amount of fuel cleaner or back flushing will make a difference for very long. When pumps fail they usually just die. Filter replacement is an expensive proposition, the fuel filter mod is a good way around it for sure and allows a fresh filter every couple of years.

Or every oil change if one wanted. the filter is about 8$.

you are totally right, I didn't even know there was a filter in the tank aside from the screen at the bottom of the pump. I can't believe the price for a replacement filter from Suzuki either.

I think the pumps wear overtime as well, for the cost of one of those German made bosch's I think its a good idea while in there. not a direct swap, but easy enough. I can explain if anyone is interested.

 

[clean]

Y'know, it amazes me how soooooo many bikes' maintenance schedules are ignored and the bike just gets ridden . . . . A LOT!
Busas have an appetite consumable items such as air filters, oil filters, FUEL filters, tyres, chains and sprockets, BRAKE and CLUTCH fluid, FORK oil, brake pads etc etc.
Yet so many owners just neglect their bikes and then wonder why they have issues with power loss etc etc.
In the 7 years I've owned my '99 Busa, and the 70,000kms I've ridden on it, I have kept a log on everything I've done to my bike . . and I mean EVERY thing.
I have a huge amount of entries into this log, and when I added the cost, it was more than I paid for the bike.
BUT . . . my Busa runs perfectly EVERY time I ride it and it's never let me down.
It has 144,000kms on the clock and still runs sweet.
Moral of the story . . . maintain the machine and look at it as a labor of love!

Im like you Kiwi, I've done everything to bring my busa up to snuff since I bought it with 35,000km (now has 42,000). fork seals, valve adjustment, chain/sprockets, brakes, air filter, plugs, all hydraulic fluids etc etc etc.

I was just not aware of that filter in the tank, or I would have been all over it sooner.

does your bike have the external pump? do they suffer from a crappy filter to?

 

[clean]

I replace my 4-wheeled vehicle's fuel filter fairly regularly. My busa is 18yrs old and I don't think anything in the tank has been touched might look into it next winter cuz I know that thing has to be nasty

Don't delay....

 

[Kiwi Rider]

.....does your bike have the external pump? do they suffer from a crappy filter to?

Yup, external fuel pump, and I’ve overhauled it twice, cleaned it thoroughly each time. And with the external pumps... it’s imperative the big foam insulation boot is on that pump, otherwise with the heat of the crankcase the possibility of cavitation is a real concern, causing poor fuel pressure at the injectors and consequently poor running issues.

 

[SSGT_B]

What’s y’all thoughts on either having the injectors sent out to be cleaned, or buying the kit to do the cleaning? At 50k miles is it worth it if I don’t have any issues that stand out?

 

[clean]

What’s y’all thoughts on either having the injectors sent out to be cleaned, or buying the kit to do the cleaning? At 50k miles is it worth it if I don’t have any issues that stand out?

I cleaned mine myself with carb cleaner and a 9v battery.

 

[Kiwi Rider]

What’s y’all thoughts on either having the injectors sent out to be cleaned, or buying the kit to do the cleaning? At 50k miles is it worth it if I don’t have any issues that stand out?

Jerry, I had mine flow tested and spray pattern checked by a local specialist with top notch equipment, now bare in mind they are 21 years old and 140,000km, and they came back as very good condition.
Cost me $80 to have it done and I really did it for the peace of mind to know the condition of them.
They check them first BEFORE cleaning and note the flow rate... then clean them and recheck the flow rate and show the comparison.
So yeah, I reckon it’s worth it from that perspective.

 

[E Zurcher]

The Motion Pro Fuel Injector cleaner works well on Gen 2 injectors. It will work on Gen 1 also but due to the large base flange of the injector, you have to hold it in place manually. Easy to see the spray pattern when using this tool and you can tell if you have a bad injector pretty easily. I clean mine at he start of every riding season.

 

[Kiwi Rider]

The Motion Pro Fuel Injector cleaner works well on Gen 2 injectors. It will work on Gen 1 also but due to the large base flange of the injector, you have to hold it in place manually. Easy to see the spray pattern when using this tool and you can tell if you have a bad injector pretty easily. I clean mine at he start of every riding season.

You mean this?

 

[toncrell]

very informative clean, thanks for the heads up

 

[SSGT_B]

And so it shall begin. I’ll make a thread this weekend to document it all. Parts are at the ready

 

[pashnit]

How mine looked at 8000 miles on my '08. Bike must have sat alot with previous owner. Bought the rebuild kit off eBay and runs like a champ in the fuel delivery department. Messing with fuel delivery issues though is a HUGE pain.