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Discussion Starter #1
I just bought an Erion 2001 929 and it has been sitting with the same fuel in the tank for approx 5 years.

It has 9500kms ( 6000miles) on the clock and ran fine last time it was used...
Unbeknown to me i rode this bike home with this old fuel in the tank,,,,, Before i had gone 3miles,,, cough splutter and so on...

The next day it got new plugs, new fuel, new oil and filter,,,,, and it ran fine on the first test run for about 1mile and then it came back again... cough splutter... really bad,,, fuel smell straight from the exhaust pipe.....

Anyway,,, i am going to pull out the injectors and give em a clean and a test because i am thinking it must be injector related...

I have been reading on here about this topic and have seen that the ohms should be about 11 and if it is open circuit they are stuffed etc etc...

Are they easy to clean once they are off the rail or do they have to be powered to allow them to be blown through with compressed air???

And if yes,,, what voltage????
 

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Injectors don't know if they are plugged so I don't think ohms is a good check for that unless it was just dead totally maybe. If it will run, I'd put a strong injector cleaner additive in a drive it for an hour or so. The parts that are gunked up from old gas aren't easy to clean from the injector even out of the bike. It does only open when energized as well. The blockage is more internal at the nozzle where very tiny holes are.

This method is easier too. Drain the tank, clean as best you can and start with fresh gas and inj cleaner.
 

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I just bought an Erion 2001 929 and it has been sitting with the same fuel in the tank for approx 5 years.

It has 9500kms ( 6000miles) on the clock and ran fine last time it was used...
Unbeknown to me i rode this bike home with this old fuel in the tank,,,,, Before i had gone 3miles,,, cough splutter and so on...

The next day it got new plugs, new fuel, new oil and filter,,,,, and it ran fine on the first test run for about 1mile and then it came back again... cough splutter... really bad,,, fuel smell straight from the exhaust pipe.....

Anyway,,, i am going to pull out the injectors and give em a clean and a test because i am thinking it must be injector related...

I have been reading on here about this topic and have seen that the ohms should be about 11 and if it is open circuit they are stuffed etc etc...

Are they easy to clean once they are off the rail or do they have to be powered to allow them to be blown through with compressed air???

And if yes,,, what voltage????
I can't believe five-year-old fuel would even start the engine let alone keep it running.
If it's been sitting that long its worth checking the fuel pressure regulator hasn't deteriated. Pull the vacuum line and make sure there's no fuel in it.
The injectors have filter screens which may be gummed up with fuel.
 

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and if all else fils look into picking up a set of 954 injectors, they are direct swap and produce a finer mist of fuel due to different "nozzles" or tips i guess i would call them. you would probably see a tiny power increase as well as better fuel mileage. Sometimes you can find a real good deal on ebay. You may even be able to find some 954 throttle bodies while your at it. They are 42mm as opposed to the 40mm's that come on the 929, and they are also a direct swap. Money well spent if you ask me. Heres a link to some i just found.... 954 injectors, buy and sell Parts Accessories on eBay Motors
 

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Discussion Starter #6
OK, i have had the injectors and the pressure regulator cleaned and they are clear of grime.
Put it all back together and ran it and now the fuel delivery is great but it is only running on the two inside cylinders,,,, as the outside two pipes are stone cold.....
I put brand new plugs into it and then rode not far when i was having the fuelling problem...
I am wondering whether a gross overfuelling could have killed two of my new plugs within a few miles????????
 

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Discussion Starter #8
OK...
I did better than drying the wet plugs,,, i changed them again..
Started the bike and went for a small ride around the block....
When i returned i could touch the outside pipes because they were not hot but a little warm from the head and the middle 2 were like they should be,,,,(stinking hot)......

I am starting to become a little lost with this problem...

Do the coils look after 2 cylinders each??? and if they do...... is it the pairings like i have mentioned,,,,, eg::: 2 centres and 2 outside or is there a coil per cylinder>>???

When i first start the bike it idles on all four for about 1 minute then starts breaking down and goes to run on 2 again..
 

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Have you checked that the vacuum line on the FPR is dry?
 

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Discussion Starter #10
Have you checked that the vacuum line on the FPR is dry?
If the vacuum line is wet could it stop cylinders 1 and 4 from firing???
I have got spark on all four at all times...

When it very first starts and everything is cold the motor runs on all four perfectly,,, but after 2mins of running 2 of the cylinders (1 and 4) stop working properly,,,,, it starts overfueling really badly..
 

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If the vacuum line is wet could it stop cylinders 1 and 4 from firing???
I have got spark on all four at all times...

When it very first starts and everything is cold the motor runs on all four perfectly,,, but after 2mins of running 2 of the cylinders (1 and 4) stop working properly,,,,, it starts overfueling really badly..
Not sure which cylinders are mostly affected by a bad FPR but number one is the most likely.
It probably won't stop the plugs firing but it will make them very rich, which will make the affected cylinders run cooler and badly.
When an engine is cold it needs a lot more fuel because the fuel doesn't vaporise so well when it's cold - that's what choke circuits do. Once it warms up it vaporises properly and a rich condition will then be running poorly - just like leaving the choke on.
 

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Discussion Starter #12
Not sure which cylinders are mostly affected by a bad FPR but number one is the most likely.
It probably won't stop the plugs firing but it will make them very rich, which will make the affected cylinders run cooler and badly.
When an engine is cold it needs a lot more fuel because the fuel doesn't vaporise so well when it's cold - that's what choke circuits do. Once it warms up it vaporises properly and a rich condition will then be running poorly - just like leaving the choke on.
Ok.. I removed and checked the Fuel Pressure Regulator and i found traces of fuel in the vacuum side of it..
I shook it and fuel came out of the small bent pipe....
I have actually ordered a new one from Honda Aust and it arrived Friday but i was going to send it back when i heard that Peter Stevens have never ever sold one in Australia...
$130........hhhmmmmmmmmmmmmmmmmmmmmm...............

And then in addition to my past comments,,, i find out today by giving it another squirt,,, that when the revs go past 5500,,,,,, it seems to be fine with full power...but whenever it is under 5500rpm it runs like a bag of crap..
Both cylinders are still running cold when it is warmed up,,,,, even though today i changed all the injectors around and also the coils...... The problem stayed with 1 and 4...
This is driving me nutso...
Oh,,,,, and 1 and 4 are both linked by a common vacuum line...
Cylinder 1 line goes straight into the FPR and no 4 goes straight into the map sensor,, but like i said they are linked..
 

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I have actually ordered a new one from Honda Aust and it arrived Friday but i was going to send it back when i heard that Peter Stevens have never ever sold one in Australia...
Why were you going to send it back?
Lots of them are going bad around now so it's good maintenance to replace it anyway but it sounds like yours is dead.
Sitting for five years would just about guarantee the FPR is dead.
 

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Discussion Starter #14
Why were you going to send it back?
Lots of them are going bad around now so it's good maintenance to replace it anyway but it sounds like yours is dead.
Sitting for five years would just about guarantee the FPR is dead.
So i guess i will bite the bullet and change it tomorrow....
It did have fuel in the vacuum side of it,,,, and from what you said previously i am guessing there should be zero fuel in the vacuum side of it.?
 

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So i guess i will bite the bullet and change it tomorrow....
It did have fuel in the vacuum side of it,,,, and from what you said previously i am guessing there should be zero fuel in the vacuum side of it.?
The vacuum chamber has a rubber diaphram. When you apply vacuum by running the engine the diaphram opens the valve.
If the diaphram tears or perishes the vacuum simply sucks neat fuel straight into the cylinders.
 

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Discussion Starter #16
The vacuum chamber has a rubber diaphram. When you apply vacuum by running the engine the diaphram opens the valve.
If the diaphram tears or perishes the vacuum simply sucks neat fuel straight into the cylinders.
Yep cheers....
Makes a lot of sense now...

I will be buying that tomorrow....
 

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Discussion Starter #17 (Edited)
The vacuum chamber has a rubber diaphram. When you apply vacuum by running the engine the diaphram opens the valve.
If the diaphram tears or perishes the vacuum simply sucks neat fuel straight into the cylinders.
Ok ... I bought and installed it....
Problem is no longer,,,, thanks for your help....
Bike is running like a dream...

And Number 1 cyl is a direct feed from the FPR with a link to no 4...
2 and 3 are on a different vacuum line...

Regards.....
 

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Ok ... I bought and installed it....
Problem is no longer,,,, thanks for your help....
Bike is running like a dream...

Regards.....
Excellent result!
Should be good for another six years at least :)
 

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and if all else fils look into picking up a set of 954 injectors, they are direct swap and produce a finer mist of fuel due to different "nozzles" or tips i guess i would call them. you would probably see a tiny power increase as well as better fuel mileage. Sometimes you can find a real good deal on ebay. You may even be able to find some 954 throttle bodies while your at it. They are 42mm as opposed to the 40mm's that come on the 929, and they are also a direct swap. Money well spent if you ask me. Heres a link to some i just found.... 954 injectors, buy and sell Parts Accessories on eBay Motors
msf0002
How do you know the 954 throttle body/injectors are a direct swap for the 929? I'm just not sure, I've never herd of that before. My 929 is starting to sputter and bog a little off the line and it also is idling lower and lower. I turned up the air/fuel mix hand screw to bring the idle back up, but now the mpg's are going down and I know that's not what that screw is really for. It's 11 years old now and I know they have never been cleaned so I'm sure it's about time. I was thinking if you were sure about that I might just do an upgrade. Hook me up with some info buddy! :)
 

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msf0002
How do you know the 954 throttle body/injectors are a direct swap for the 929? I'm just not sure, I've never herd of that before. My 929 is starting to sputter and bog a little off the line and it also is idling lower and lower. I turned up the air/fuel mix hand screw to bring the idle back up, but now the mpg's are going down and I know that's not what that screw is really for. It's 11 years old now and I know they have never been cleaned so I'm sure it's about time. I was thinking if you were sure about that I might just do an upgrade. Hook me up with some info buddy! :)

I've run 954 throttle bodies and injectors on my 929 and really like them.
Sounds like your fuel pressure regulator has failed. Pull the vacuum line and turn on the ignition to prime the rail. If fuel comes out you need a new regulator.
 
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