Gen 1 weird rpm signals

[busakiller]

2004 hayabusa 1397
Pcv
Auto tune
Pod 300
Flashed ecu
24 volt start

OK guys when this started I can't remember as I have been fighting this for at less a year now. Was dealing with power commander and no luck. So asking you guys.

Problem
When riding my bike at a cruise or at slight throttle I get a weird jerk on the bike. Doesn't happen constant but everytime I ride the bike. I log with the pod 300 and it shows a crazy rpm and then back to normal. On one data line it will show like 15 to 20k rpms but the injectors and afr look normal or close to it. Next data line show's rpm where it should be but the injectors are wide open and afr is rich. Then the next data line is all normal.

So for some reason my bike is getting a weird rpm signal and causes my bike to jerk at a cruise or slight throttle. But does not do it when I am wot doing a pull. I am have been trying hard to figure this out before I bring it somewhere and pay big bucks for it to be solved.

Things I have done.
Unplug the power commander and the bike still does it. Looked at wiring, loose connection, burnt wires, fuses. Just can't wrap my head around it.
As I am writing this iam wondering if crank sensor going bad? But isn't that part of the stator?

 

[jermzfree]

If your crank sensor went bad I think you would have more than a small jerk. Did you check the TPS?

 

[busakiller]

I haven't checked the tps. I will try the tomorrow night. I took the wire harness apart and didn't find any bad wires.

 

[busakiller]

Looked on YouTube the other day and say a thing on how to adjust the tps. I put the bike in dealer mode and boom. It showed the tps was out of adjustment. So I messed with it this moring and the laptop. Going to wait for everyone to wake up before I start the bike. I hope this was the problem.

 

[jermzfree]

Laptop? are you checking it in dealer mode or through your pcv? In dealer mode at 1150rpm the little line on the dash should be in the middle and your good to go

 

[busakiller]

I checked it with dealer mode and power commander.

 

[busakiller]

Took the bike for spin and it seems like that did the trick. Time to start street tuning it and turn the bottle on.

 

[Jdiddy313]

Can you give me the link on how to adjust the TPS? My Busa is doing the same thing!

 

[busakiller]

So the tps was not my problem. ThinkING it's power commander related

 

[ali123]

So the tps was not my problem. ThinkING it's power commander related

if u unplugged the pc and it still did it...…….. maybe bad coil.... I dunno… seems like sooo few people ever swap out coils, and they rarely go bad/ maybe slightly weak spark down low causing havoc... plugs look good?

 

[busakiller]

That's one thing I never did at the track was unplug the power commander.

 

[ali123]

That's one thing I never did at the track was unplug the power commander.

well... it would be a good idea.... I don't know what logging capabilities u have... but maybe u could even unplug one coil at a time while its running.… and see if u can get any data that way.... see if u can eliminate these spikes by unplugging a bad/weak coil.... im not a bike guy... don't even work on my current bike,.... but this is old school stuff to "test" things.... obviously u would be down a cylinder while running but a decent way to elimate that possibility of weak spark... PLUS we all know how finiky these bikes get with battery issues.... volts/amp issues? stator plug not melted? mine was.

 

[busakiller]

This coming weekend I will try disconnecting a coil and see what happens. And test them all that way. That's not a bad idea. I have at less 8 months to figure it out. So I will be testing everything I can think of and whatever ideas people can thing of

 

[ali123]

This coming weekend I will try disconnecting a coil and see what happens. And test them all that way. That's not a bad idea. I have at less 8 months to figure it out. So I will be testing everything I can think of and whatever ideas people can thing of

u might wanna just use a car battery to power the bike... to MAKE SURE its getting enough juice...…… eliminate that possibility.

 

[David Offor]

Spikes could be down to a faulty regulator, can you test the charging, across the battery, at different revs? Check plug couloir, set TPS correctly, sync throttle bodies.
I ended up finding a faulty ckps (crankshaft position sensor), on my 2000 plate, backfiring in the throttle bodies, throwing misfiring codes, when reved to 9500rpm.