Injection system changes for '06?

[manowell]

I'm new to Yamaha bikes, I ride a BMW K-bike and a Suzuki scooter now. I rented a '05 FJR over the weekend and LOVED it, other than the obvious heat issues.

My local Yamaha salesman (who rides a '05 FJR) tells me that the older models took the gas to the injectors and returned the unused majority to the tank, this eventually heats up the gas in the tank pretty well. My '92 BMW does this as well, so I'm familiar with it on longer rides.

Anyway, salesman says that the '06s have a new system where only the fuel needed is drawn from the tank, thus no fuel warming up.

I can't find any other mention of this on Yamaha's site.

Is my salesman imagining this, or is it a real change?

Thanks!

 

[ionbeam]

Sales guy is right.

 

[SkooterG]

Sales guy is right.

Where did you get this info? I have never read anything about changes to the F.I..

 

[ionbeam]

Intake '06

Intake '03-'05

 

[Fred H.]

Notice there is no fuel pressure regulator at the end of the fuel rail on the 06. The pressure regulator is built into the fuel pump now.

There is what appears to be some sort of new spring loaded damper valve on the fuel rail of the 06, and I *think* the purpose of it is to absorb pressure spikes in the fuel rail from the action of the injectors opening and closing.

 

[SkooterG]

What? I am supposed to make head or tails of those jigsaw puzzle diagrams you show? Aye carumba!

Very interesting. Thanks for the info.

 

[ionbeam]

There is what appears to be some sort of new spring loaded damper valve on the fuel rail of the 06, and I *think* the purpose of it is to absorb pressure spikes in the fuel rail

I think Fred has that right. While shooting troubles on my '04 I put a buffer first on the vacuum line that operates my external pressure regulator and then later put a buffer on the fuel rail itself. This was for diagnostic purposes, and not an end to itself -=but=- it did good things for my bike. After I get the compulsory repair parts installed I'm going back to the fuel rail again.
Short term observations: My bike normally takes 2-4 revolutions before it starts, with vacuum buffer it started instantly. Gradually over time my cold idle speed has dropped so that I rarely see more than 1.5k RPM, with the vacuum buffer I'm getting ~2k RPM, with the fuel & vacuum buffer together the last vestiges of surging went away. Don't nobody get carried away with this I only ran this way one day and less than 100 miles so none of this is conclusive. I don't know what this means for throttle response, fuel deliver rate, injector pressure, fuel pressure regulator response time, etc.

To Fred's observation, I think there was some room for improvement with the fuel delivery & regulation and the '06 got it. Hopefully the FI rail got improvements better than the throttle pulley.

What? I am supposed to make head or tails of those jigsaw puzzle diagrams you show

Well, I could have explained the differences in a million words or more but don't think it would have been any clearer than the million part diagrams. :blink: Howsomever, there is nothing like factory drawings to validate that there were actually changes.

 

[painman]

It just keeps getting better and better....PM. <><

 

[Dan23]

What? I am supposed to make head or tails of those jigsaw puzzle diagrams you show? Aye carumba!
Very interesting. Thanks for the info.

Perhaps #'s 38- 42 in the '03 to '05 drawing is the return line.

 

[starcruiser(aka downn2)]

I'm new to Yamaha bikes, I ride a BMW K-bike and a Suzuki scooter now. I rented a '05 FJR over the weekend and LOVED it, other than the obvious heat issues.
My local Yamaha salesman (who rides a '05 FJR) tells me that the older models took the gas to the injectors and returned the unused majority to the tank, this eventually heats up the gas in the tank pretty well. My '92 BMW does this as well, so I'm familiar with it on longer rides.

Anyway, salesman says that the '06s have a new system where only the fuel needed is drawn from the tank, thus no fuel warming up.

I can't find any other mention of this on Yamaha's site.

Is my salesman imagining this, or is it a real change?

Thanks!

Now, there's a salesman at a dealership who the knows his stuff!!!! What a breath of fresh air that must be....

That's about 180dg from the BOZOs I had to deal....Maybe the buying experience for me would of been better if I'd wouldn't of had to show the Owner, along with his sales staff how the sides vents open & Close. To make matters worse, then have had to show the head mechanic how to start the bike so I could drive it home.....(engage the brake)as he couldn't get it to started.....and the then owner tried to sell me on letting them install grip warmers.....( the AE comes standard with them) I took him out and showed him....He just scratched his head and said WOW... BAD SIGN, I THOUGHT ANYWAY!!

That's why, mechanically impaired as I am, I'm considering trying to work on the bike myself....I've emailed Warchild asking for a list of tools I need ( I have none) and I guess he thinks I'm an idiot for having to ask, thus hasn't responded, so I may have to put up the BOZO

 

[SkooterG]

I've emailed Warchild asking for a list of tools I need ( I have none) and I guess he thinks I'm an idiot for having to ask, thus hasn't responded,

Don't feel bad, or singled out. Warchild is an extremely busy boy. Heck, he doesn't usually answer my emails either. Or perhaps, maybe he doesn't answer mine on purpose? :lol:

For best results, go to the technical section and start a post asking folks what tools you will need. You will get all kinds of good info.

 

[radman]

Looks like the pump is designed to maintain rail pressure internally, with a built in return.

 

[Fred H.]

Looks like the pump is designed to maintain rail pressure internally, with a built in return.

Yes, it is. It also has it's own built in fuel filter. So I guess if the filter ever gets clogged, you have to buy a new pump.

Bad news for those that have to run Ethanol, as it is well known that Ethanol will absorb water and clog fuel filters.

 

[ionbeam]

In the picture Intake '03-'05 item #38 is indeed the fuel return line.

All pre '06 FJRs have 'permanent, non replaceable' fuel filters too. :glare:

 

[radman]

In the picture Intake '03-'05 item #38 is indeed the fuel return line.
All pre '06 FJRs have 'permanent, non replaceable' fuel filters too. :glare:

And I have yet to hear of any FJR's clogging the inlet filter, outside of those that suffered vandalism etc.

 

[ionbeam]

And I have yet to hear of any FJR's clogging the inlet filter

(Intake Filter Shown Acutal Size)

 

[Fred H.]

Maybe the fuel filter is a non-issue. Still, I wish it were replaceable. Most fuel injected vehicles will reccomend fuel filter replacement at around 30K mile intervals. Guess I'll have to wait till I hit 200K miles and see if I have any problems.

 

[Constant Mesh]

The fuel pressure has been increased for '06.

The fuel pressure of the earlier FJRs was regulated at 36 psig. This pressure was referenced to the manifold intake air pressure of the throttle bodies via the fuel regulator vacuum hose.

On the '06 the regulated pressure from the fuel pump is 47 psig. It's no longer referenced to the throttle body intake vacuum.

 

[manowell]

Now, there's a salesman at a dealership who the knows his stuff!!!! What a breath of fresh air that must be....
That's about 180dg from the BOZOs I had to deal....Maybe the buying experience for me would of been better if I'd wouldn't of had to show the Owner, along with his sales staff how the sides vents open & Close. To make matters worse, then have had to show the head mechanic how to start the bike so I could drive it home.....(engage the brake)as he couldn't get it to started.....and the then owner tried to sell me on letting them install grip warmers.....( the AE comes standard with them) I took him out and showed him....He just scratched his head and said WOW... BAD SIGN, I THOUGHT ANYWAY!!

That's why, mechanically impaired as I am, I'm considering trying to work on the bike myself....I've emailed Warchild asking for a list of tools I need ( I have none) and I guess he thinks I'm an idiot for having to ask, thus hasn't responded, so I may have to put up the BOZO

Well -- He told me 490 watt power system, too, and from this site I know it's 590 now. He's also been willing, but reluctant, to find information to address any other questions. I had to fiddle with the riders saddle to figure out how to adjust the height, he was amazed that it did that.

So -- jury's still out, but he was right on that one. B)

Thanks to all others that responded with good info, too!