[EvoFTW]

I have some kind of "progress" with my trouble. It was getting worse for the last few days...

Now the bike starts and dies immediately. Sometimes it holds ~800ish rpm for a second or two and then dies. I can hold rpm with the throttle and even ride it a bit, but as soon as I let off the throttle it dies. The bike feels slow and sluggish. If I give it more then ~40% gas it falls on its face. I can hear the intake sucking air, but NO power at all, the bike just slows down - no acceleration.

It seems like the throttles are opening, but ECU doesnt know it and uses wrong values from fuel\ignition tables etc. So I've checked TPS ets sensors through diag mode. Nothing.

I have no ideas for now...

 

[Tad158]

Fuel line? Or fuel pump?

 

[EvoFTW]

Fuel line? Or fuel pump?

Checked multiple times. Fuel line modded, impossible to kink.

Stuttering and hesitation were worsening in a few days, but new symptoms came at once, after one of my stops. I went to a shop for a few minutes, came back, tried to start it and got all these symptoms - dies after start, no idle, low power, no power at mid and high throttle.

The switch between "low power possible to ride" and "no power at all, slowing down" definately happen at certain throttle position, but independantly from RPM.

Is there any chance that something is wrong with timing (jumped a tooth etc), Cam or Crank sensors?

 

[EvoFTW]

I've checked my timing and it turned out that my intake cam was 2 teeth retarded. I've re-set correct timing and bike got back its power and starts fine as always. I've also checked crank, cam and throttle position sensors, coils - everything is fine.

But low-mid RPM low throttle hesitation is still present.

That gave me an idea that old CCT (as mine) could affect timing in low RPM due to lower oil pressure at that RPM. Timing fluctuation could cause any type of hesitation. Correct me if I'm I wrong.

I'm thinking to try mechanical CT.

 

[Mach.81]

http://www.gravesport.com/Graves-Mo...om/Graves-Motorsports-Yamaha-R1-High-Precision-Cam-Chain-Tensioner.html#reviews

 

[EvoFTW]

Yes, I've read that before.

Just wondering if original 09 CCT can be the root of my problem... Dont want to spend money on tuning stuff if that doesn cure my issue.

 

[Zeroshifta]

I've checked my timing and it turned out that my intake cam was 2 teeth retarded. I've re-set correct timing and bike got back its power and starts fine as always. I've also checked crank, cam and throttle position sensors, coils - everything is fine.

But low-mid RPM low throttle hesitation is still present.

That gave me an idea that old CCT (as mine) could affect timing in low RPM due to lower oil pressure at that RPM. Timing fluctuation could cause any type of hesitation. Correct me if I'm I wrong.

I'm thinking to try mechanical CT.

let me know if this helps your problem cuz im having the same issue. i havent been able to trouble shoot it much here lately

 

[Mach.81]

If the original one skipped two teeth...I would change it out. Yamaha knows all too well about this issue.
:fork

 

[EvoFTW]

If the original one skipped two teeth...I would change it out. Yamaha knows all too well about this issue.
:fork

We dont have any kind of mechanical CT available in stock in any of local shops, so I have to order one. But that would take a lot of time. So I will probably try to buy\make a DIY mechanical CT, to eliminate that problem.

You can check it out on these videos:

 

[Zeroshifta]

any revelations from anyone? i still have this problem

 

[YamahaPower]

Im still having it but much less , im going back on the dyno saturday and we will try to fix it definetly , I will let you know

 

[Zeroshifta]

ok thanks dude

 

[NoxImus]

We dont have any kind of mechanical CT available in stock in any of local shops, so I have to order one. But that would take a lot of time. So I will probably try to buy\make a DIY mechanical CT, to eliminate that problem.

You can check it out on these videos:

http://www.youtube.com/watch?v=VZNwOfuC334
http://www.youtube.com/watch?v=Oq3svy9vtPE
http://www.youtube.com/watch?v=9vL49RI-q2k

That CCT looks like it is way over tightened in that last video. Maybe there isn't as much shaft as I'm used to seeing. :corn

 

[My Dog Ziggy]

I'm still having it but much less, I'm going back on the dyno Saturday and we will try to fix it definitely, I will let you know.

When you do this, look closely at your torque curve from approximately 3500rpm to 6000rpm. See if there is a noticeable dip in the torque curve in that rpm range. All the dyno graphs I've seen for the crossplane seem to have this.

My theory is this (and it's only a theory. I have no proof). I don't have a lot of surging, but I do have a very noticeable lack of power in that rpm range. I'm thinking it has to do with the fly-by-wire throttle mapping since the throttle cables run to a servo and the servo is what opens the throttle bodies. For instance, if you twist the throttle 15%, the throttle bodies may only 10% until the revs reach 6000rpm due to the fly-by-wire mapping. Then once you get to 6000rpm, the throttle mapping changes and that's what causes the sudden jump in revs. In the area where I live, there are many roads that have long uphill grades and it's very noticeable when accelerating in 1st, 2nd and 3rd gear.

I believe some riders don't notice this as much because of their riding style. If you accelerate at a more rapid pace, the the motor tends to rev faster in the lower rpm's. If you shift at say 10,000rpm, then the revs will stay above 6000rpm and this does not occur. Next time you're riding, accelerate fast from a stop, then accelerate at a normal pace and shift at a lower rpm and you'll see a difference (or at least I do).

Again, this is just my theory and I have no proof. :dunno

 

[Tad158]

That is not true for my throttle by wire maps...

 

[My Dog Ziggy]

^ I know that you worked on the throttle mapping. Did you find anything to indicate the factory maps do what I'm suggesting?

 

[Tad158]

Sort of...I am on my phone now, and will elaborate more later

 

[YamahaPower]

Problem solved at 80% for me , there still some jerking but much less . He added more fuel through that range 1k-5k rpm and it alot better .

 

[Zeroshifta]

my throttle bodies will not sync at all. sync'd them yesterday and rode it for about 45minutes only for it to start stalling and the idle fluctuating again. Jerking is still there too! this is a real drag for me!

 

[EndlessR68]

having the same problem here on my 04... anyone try to clean / lube the throttle bodies?