The weather's warming up!

HIIC Riders be safe on the road! I've almost been merged on a few times on 2 wheels over the last few days of riding and I make it a point not to ride a blind spot - but it still happens...


In a semi-related note, riders with some mechanical knowledge; I'm in need of diagnosis help; It's a long story I posted on another forum (not sure about cross forum posting) so if anyone thinks they can help diagnose a sportbike having starting issues, lmk, I've posted video and pics, I'll probably be wrenching on it all night tonight because it's killin me lol - i can PM a link to the thread


Ride Safe!

 

Revival of a thread +1

PM me the vid/pics description.
I'm assuming you checked plugs and battery. Move to fuel pump, injectors, coilpacks(if any).

what kind of bike?

 

YGPM - I've done Air > Spark > Fuel

Air checks out
Spark seems legit
Fuel might be the issue

it's an '00 GSX-R750, I'm itching to ride; it did a day pretty flawlessly but then got progressively worse and luckily decided to call it a day after I parked it at my place

 

PM me the vid and details. Check your fuse box on the right side fairing below your throttle. Also, check your relay; I forgot where it's at on the first gen k series gsxrs.

 

that... was one hell of a read Tesh... I went through 2 cups of coffee.
Me browsing the Suzuku forums... I feel so.... dirty now... lols

Hard has heck to diagnose that kind of thing, but it looks like spark delivery.
Unless.... 2 out of the 4 coil packs are bad. 1 bad, it still would start but run like a lawnmower. 2 bad, it would do what it's doing now and maybe... start. But that would be with a good working order motor that's been running and no issues turning over and what not. You seem like you're going to take out the coilpacks+plugs and test. This is what i would recommend being your next step. Let me know how it goes with that and we'll move onto the next.

You didn't put any sea foam in it yet did you? If not, DON'T. until you get a good crank over. Then put it in when it can run without any start up issues.

 

I'm gonna have to start playing mechanic on my bike soon too I think. Don't worry Brett, you can go back to the r6 forums and help me soon!

Getting on H3 on my way home after rally, I got on it, and it practically died on me, felt like it hit a rev limiter at 8k rpm. Started to pull over and it regained power and I was able to ride home without issue. Bleh, just what I needed, more **** to break. lol.

 

Whoa, that's no good. So you were pounding it and it just sputtered out on you?
That actually sounds like a coil or injectors(not likely) on the way out. When you give it gas and the spark increases as the throttle goes up and all of a sudden it feels like a power cut, that's coil. Of course.... you can get some junk on the tip of the injector and blow it through and the same thing happens. Done both of those and lost my mind trying to find it because it was too quick to throw a code.

At any rate, let me know if you need any help on it. Pain in the butt to diagnose that stuff, specially when it fixes itself like that.

 

hahah I felt that way on VTX forums with my V-Twin, I'm so much more a sportbike rider than anything else I think...

So short story, it's fixed. Figured out where I messed up late last night. It was painful because knowing the fault is great, except knowing that you're the one who caused it too

I took apart the fuel pump when cleaning the strainer and didn't pay attention to the fact that I left the O-Ring in it's seat rather than properly installing it on the barb - that must've held some pressure for a while but as the system pressure expanded it pushed the pump housing away from the barb losing all pressure.

Glad it's fixed, but I feel like a fool lol. On the plus side I've read about 2000 threads and the FSM cover to cover about 6 times so I don't anticipate there's an question I can't answer these days haha... I do have seafoam in it now btw, is it bad to leave it in the tank or should I ride it out within a day or two? (I'm a fair-weather rider so maybe this weekend, just not worth getting rained on for a 5mi commute)

That sounds a lot like fuel delivery (lack of pressure at load) - saw lots of threads where bikes wouldn't rev past 4k-8k-11k in steps and it's basically the pump not keeping up. If you have backfires then check your plugs/coils/wiring.


skip to ~35sec in the vid, you'll see his pressure drop from 43psi (per the book) to half, basically cutting the motor until load was dropped and pressure could regain. Definitely start with the fuel pump. I'll PM you my thread too so you can see my diagnosis method (aka banging my head against the wall lol)

I'm down to wrench on bikes as well, I got back in the swing of tearing mine down recently again, takes me hardly a few mins these days to get down to the frame haha

 

I actually thought fuel as well, bikes been having a hard time starting of I don't sit there and let the pump prime a few times. And it only does it when I really get on the gas. Guess this coming Sunday I'll be busy. Maybe Friday I can make time for the bike. Thanks Tesh.

 

LOL Ryan... I just looked up that code you gave me last night.
*shakes head*
When you look it up, you're going to fall over.
I'll just stay silent on this one, but on the bright side, Tesh and you have something in common now.... I think.

 

Can't fall over when the kickstands down. Explains the starting issue, maybe it's a loose wire? Idk kickstand is up and I'm always in neutral when I start so something's messed up.

When it died on me, there was no code, what Tesh sent me, really fits what happened. Maybe I'll play with the kickstand and see if I can reproduce that sputter again.

 

There's a sensor down there that might be the issue. When I raced that bike I bridged the sensor and removed the kickstand. You can either bridge it down at the switch or goto the main harness and bypass it that way. Should be directly under the tank. Should be a blue plug with a black wire and a blu/blk wire.
Instructions at this link for doing it:
http://www.r6-forum.com/forums/showthread.php?t=99945


Definitely roll through the fuel - injector - coil steps if it's not that though. But I'd bet it has something to do with it, especially on a turn as you stated to me the other day.

I'll throw this out there because of Tesh's video about fuel pump priming.
When you FIRST throw the on switch the pump will turn on, and prime. This builds pressure in the pump all the way to the injectors but does not fire any further. If you turn this switch off/on off/on off/on, it may not prime every time because it is already pressurized. I know for fact that the R6/R6 and GSXR 600/750/1000/1100's are like that. Hondas... that's a different story, they have always been a step apart.

At any rate, best of luck, speed safe.

 

Thank's Brett, I'll probably do that to the sensor down there and then see if I still have that issue. I was thinking about the turn thing too, both times that it happened, I came out of a turn where the bike was leaned over pretty good, both right handers too, never had an issue since. Hopefully that is all that it is, don't want to have to hunt something else down.

Thanks for the help.

Tesh, Brett and everyone else with a bike. We should try get together sometime and ride! Or we'll crash an i-club cruise and show up on bikes instead....maybe not. hah

 

No Prob.
As for riding, heck yea!!!

 

that's exactly what my bike was doing - I'd prime a few times and the best it would do is sputter up but die (due to fully slipped O-Ring) lmk if you need a second ear, i'll be glad to ride by, I need to empty a few tanks haha

it may be different for other models (if they have some type of fuel pressure sensor built in) but from the FSM directly - the Fuel Pump will prime for 3 seconds, each and every time you flip the key + kill switch to run (at least it's how i've seen it on gsxrs) regardless of whether it's at peak PSI or not - this is because if the system is at 43psi, the fuel will just blow back into the tank via the pressure regulator. It made sense once I realized it, because when I was doing my pressure test, I would flip the switch and it would only prime for 3 sec, but no real pressure developed. either way the pump ran every time.

Ryan - hit up O'Reilly for a fuel pressure gauge, free to rent (as long as you put down the 130 up front) for 48 hrs - the fuel pressure test took me all of an hour - on your injector rail there's a test port, follow the pic i posted in the forum on testing from there and it'll confirm whether your pump is pressurizing or not - or if it's dropping substantially under load.

either way i'd say pull the pump and clean the strainer if you haven't done it, I was surprised how much stuff was accumulated on my strainer and the bike probably had less than 20 gals run through it lol


As far as fuel pressure drop in a turn, do you recall if you were at a full tank or not? your pump might be pulling fuel from the wrong sources - though it's more likely as you came on the power out of the turn, the pressure dropped due to clogged filter. definitely good to check your TOS mounting and kickstand kill switch. while I liked the convenience of putting the KS down in gear when I'm stopped to turn the bike off, I decided to jump the switch since it was annoying that a pothole and loose kickstand spring could cause the bike to momentarily stall

If you need the siphon pump I have I'll swing it by you - it really helped in testing the various ports for proper pressure as well as back flushing the filters with fuel

we should definitely hit up a ride! I wish I hadn't mailed all my jackets back to cali, I'm going to have to gear up again soon