XB9S out of power

[Fredrikrosen]

Hi.

What are typical signs of clogged fuel injectors? My XB9 wont rev properly, almost impossible to get over 5000 rpm. It is like it hesitates or starve, also some hesitation at 2000 rpm.

I checked the fuel pressure and it was around 3,1-3,5 bars, seemed to flow good. I plan to clean the injectors in my brothers shop, he has a special equipment for such. Can the pump be bad even if giving those values? :upset:

 

[Barrett]

Hi.

What are typical signs of clogged fuel injectors? My XB9 wont rev properly, almost impossible to get over 5000 rpm. It is like it hesitates or starve, also some hesitation at 2000 rpm.

I checked the fuel pressure and it was around 3,1-3,5 bars, seemed to flow good. I plan to clean the injectors in my brothers shop, he has a special equipment for such. Can the pump be bad even if giving those values? :upset:

Can the pump be bad even if giving those values?

YES.
tell-tale signs that the pump needs serviced:
excessive crank-to-start times particularly on over-nite or longer cold start
lazy throttle response
rolling on the throttle coming out of moderate turns results in engine stumbling
back-firing thru TB into airbox assembly
continuous climbing AFV value
odd/unusual/abnormal sounds coming from either the pump motor itself or the frame/tank area
erratic warm engine curb-idle speed

 

[njloco]

You can buy a really nice rebuilding kit for your fuel pump from ^^^^^^^^^^^^^^^^^^^guess who!

 

[Fredrikrosen]

Can the pump be bad even if giving those values?

YES.
tell-tale signs that the pump needs serviced:
excessive crank-to-start times particularly on over-nite or longer cold start
lazy throttle response
rolling on the throttle coming out of moderate turns results in engine stumbling
back-firing thru TB into airbox assembly
continuous climbing AFV value
odd/unusual/abnormal sounds coming from either the pump motor itself or the frame/tank area
erratic warm engine curb-idle speed

Barrett,

So far no back-firing but out of power and not reving properly. Can the TPS be the issue? Will clean the injectors and remove the fuel pump, i found rebuild kits on ebay which include new pump, regulator etc for about 100€?

 

[Fredrikrosen]

You can buy a really nice rebuilding kit for your fuel pump from ^^^^^^^^^^^^^^^^^^^guess who!

Thanks for the offer, i will pm you if needed. Problem is high shipping cost and toll fee’s when buying from USA. I wish a trade deal would come.

 

[Fredrikrosen]

thanks kenny for the kudos.

fredrik: can't answer your TPS question as i've only ever reset a few of them and that was because of either a questionable idle...or TPS replacement that necessitated a reset. the ECM experts on here can answer. i'm not one of them.
regarding your pump...you can simply freshen it up if you're so inclinded. often times that restores good rideability, fuel mileage, cold start and erratic idling problems, and improved throttle response.
a "refresh" simply involves removal and replacement of:
fuel inlet sock filter
high pressure fuel filter
pump housing-to-frame O-ring seals----QTY 2
drain plug O-ring seal---QTY 1
fuel level sensor---QTY 1
high pressure fuel supply line
regulator and pair of O-ring seals for same

the total of the above is not expensive and money well spent.

Barrett,

Can the parts in the link be a alternative?

https://www.highflowfuel.com/i-3546...s-lightning-2003-2007-replaces-p0130-5a8.html

 

[Fredrikrosen]

I removed the fuel pump today, it was in a very clean shape. No dirt in the fuel tank more than a black coat inside. Is there any way to check to pumps function? Or is it best to overhaul the unit preventively?

 

[BuellyBagger]

Just my humble opinion... If you've already done the work of removing it just do the overhaul. Money well spent I'd bet.

 

[Fredrikrosen]

Just my humble opinion... If you've already done the work of removing it just do the overhaul. Money well spent I'd bet.

I agree, any suggestion what to change in a fuel pump overhaul except the filter?

 

[Endopotential]

fuel inlet sock filter
high pressure fuel filter
pump housing-to-frame O-ring seals----QTY 2
drain plug O-ring seal---QTY 1
fuel level sensor---QTY 1
high pressure fuel supply line
regulator and pair of O-ring seals for same
the total of the above is not expensive and money well spent.

You've already got the answer right here. The more old parts you replace, the better. On my bike, turned out that there was a tiny hole in the flex hose, so the pressurized fuel would just spit back out into the tank.

You've already done the hard work of getting the pump out of the bike, so may as well do it right.

You should look into replacing the pump motor itself as well. There are threads here about how to check pump function outside of the bike, but they seem like a lot of work for a relatively cheap part.

 

[kz6fittycent]

You've already got the answer right here. The more old parts you replace, the better. On my bike, turned out that there was a tiny hole in the flex hose, so the pressurized fuel would just spit back out into the tank.

You've already done the hard work of getting the pump out of the bike, so may as well do it right.

You should look into replacing the pump motor itself as well. There are threads here about how to check pump function outside of the bike, but they seem like a lot of work for a relatively cheap part.

100% agree. Replace it all; cheap insurance.

 

[Fredrikrosen]

Thanks for great advice, i will change the pump, strainer, orings etc. Also connect ECMspy to see if there is any codes and if needed reset the TPS.

 

[Fredrikrosen]

After fuel pump change, injectors cleaned and tested in a shop, TPS reset and checking for fault codes (was one, fan fuse was blown) does the bike run fine. It seems the XB9 engine runs best from 3000rpm.

 

[BuellyBagger]

After fuel pump change, injectors cleaned and tested in a shop, TPS reset and checking for fault codes (was one, fan fuse was blown) does the bike run fine. It seems the XB9 engine runs best from 3000rpm.

Yes buells have a "peaky" cam shaft set up. I'm sure the power curve is even shorter on the 984cc with its shorter stroke. I've only ever had 12's, but I'd say like 3000 to 5500 is the money

 

[Cooter]

They sound like a Harley, but don't ride it like one. 7500RPM redline!

IMO lugging that poor engine at less that 3000RPM is a recipe for chattered bearings, super high cylinder pressures, unresponsive throttle, and even poor mileage. It will constantly come out of closed loop because it needs so much fuel to accelerate from that low and RPM.

 

[BuellyBagger]

Bad thing for me is I ride my harley like it's a buell... I really gotta change the cam in the ole oneone4

 

[Fredrikrosen]

They sound like a Harley, but don't ride it like one. 7500RPM redline!

IMO lugging that poor engine at less that 3000RPM is a recipe for chattered bearings, super high cylinder pressures, unresponsive throttle, and even poor mileage. It will constantly come out of closed loop because it needs so much fuel to accelerate from that low and RPM.

Worth thinking of when driving, thanks.