Twitchy throttle hayabusa

D

Djmurria

Registered
Hey its me again lol.
My hayabusa throttle is real twitchy like after about 5k rpm will buck u off if try to cruise. Fuel filter mod didn't help. Just put new injectors in it since old ones were leaking. I've put new plugs in it as well. Changed tps same thing, other tps when doing calibration after in middle I'd you moved the throttle it wouldn't move so that's why I changed it. Also changed out the pressure sensor on air box. Bike doesn't have a power commander i did flash the ecu but with the stock tune it did the same was kinda worse. Does it with 116 race fuel and 93 pump gas. Seems to be running super rich my dad said it keeps "loading up???". Switched tanks with my dad to see if the fuel filter mod was the problem still did the same thing.
If trying to launch the bike can't really hold it at any rpm between 5.5k-7k it'll go farther then u want then if u let off just a bit drops back down in the 5-6k area.
Kinda lost where to start looking seen in some other threads may be the fuel pump or throttle cables, or chain loose. My dad has a new upgraded pump in his tank and still did the same, and my chain is adjust properly, where else should I try looking other then the throttle cables?
 
Mythos said:
Try lubing throttle cables?
Click to expand...
Going to give the a try I know simple the previous owners didn't really maintain the bike.
WuzzaCBXRider said:
You’re not doing any good running race fuel unless the motor is tuned for it. Also, try adjusting the throttle cables. BTW, how many miles on this bike?
Click to expand...
My dad runs it in his bike so I just threw it in there at the track since I was low on gas. Going to try lubing and adjusting. Honestly ain't no telling the bike is a mutt lol 01 frame but the motor on top says its from a 07, has 02-07 computer and wiring harness though for sure. Odometer says 30k ish or something like that have to check again
 
Djmurria said:
Hey its me again lol.
My hayabusa throttle is real twitchy like after about 5k rpm will buck u off if try to cruise. Fuel filter mod didn't help. Just put new injectors in it since old ones were leaking. I've put new plugs in it as well. Changed tps same thing, other tps when doing calibration after in middle I'd you moved the throttle it wouldn't move so that's why I changed it. Also changed out the pressure sensor on air box. Bike doesn't have a power commander i did flash the ecu but with the stock tune it did the same was kinda worse. Does it with 116 race fuel and 93 pump gas. Seems to be running super rich my dad said it keeps "loading up???". Switched tanks with my dad to see if the fuel filter mod was the problem still did the same thing.
If trying to launch the bike can't really hold it at any rpm between 5.5k-7k it'll go farther then u want then if u let off just a bit drops back down in the 5-6k area.
Kinda lost where to start looking seen in some other threads may be the fuel pump or throttle cables, or chain loose. My dad has a new upgraded pump in his tank and still did the same, and my chain is adjust properly, where else should I try looking other then the throttle cables?
Click to expand...
I'm guessing u have no codes showing??
 
Djmurria said:
If not enough play would it surge when trying to hold a steady rpm.
Click to expand...

@WuzzaCBXRider
contradiction
yes!

if there is no or not enough play, try to ride at a const. speed / rpm - impossible

ALL cable driven throttles need that play - definitely.
(if the electrical driven too i don´t know never had one to test/inspect)

reason - every driver has a little unavoidable "shake" in his hand / arm what causes an opening/closing the throttles if no play.

wuzza,
try it once ;) by turning the "nut" at the puller cable near the handlebar so far til there is no more play and try then to ride at const spped/rpm without jerking - you won´t get it.

this is one fault (of 6) what can cause the "jerking" of a bike.

see this page - the last 3 lines in table (KFR III) - 6 reasons why a jerking is feelable.

see the manual at page 0B-1 - maintenace schedule (line 8) - "Throttle cable play"
and at page 0B-12 too where the "nut at the cable" is shown ;)

even a simple turn of the bar can "raise the engine idle speed"
 
Last edited:
Dopey said:
I'm guessing u have no codes showing??
Click to expand...
No at all I it gets the occasional c23 but that's cause the wire on the tip over sensor was messed up.
Berlin Germany said:
@WuzzaCBXRider
contradiction
yes!

if there is no or not enough play, try to ride at a const. speed / rpm - impossible

ALL cable driven throttles need that play - definitely.
(if the electrical driven too i don´t know never had one to test/inspect)

reason - every driver has a little unavoidable "shake" in his hand / arm what causes an opening/closing the throttles if no play.

wuzza,
try it once ;) by turning the "nut" at the puller cable near the handlebar so far til there is no more play and try then to ride at const spped/rpm without jerking - you won´t get it.

this is one fault (of 6) what can cause the "jerking" of a bike.

see this page - the last 3 lines in table (KFR III) - 6 reasons why a jerking is feelable.

see the manual at page 0B-1 - maintenace schedule (line 8) - "Throttle cable play"
and at page 0B-12 too where the "nut at the cable" is shown ;)

even a simple turn of the bar can "raise the engine idle speed"
Click to expand...
Ok I'll give that try thanks
 
Berlin Germany said:
@Djmurria

but please don´t forget to tell us the result(s) ;)

would be helpful, i guess, 4 all here :)
Click to expand...
I clicked on that link and kfr 4 says gps mine has been acting weird. It'll say neutral but if u rev it with kickstand down bike will cut off when neutral light goes off would that be causing the issue. I did have the clutch in set at 7200 to help launch but even then just a really tiny bit goes from 5.5-6k to banging on the 2 step hard. Flashed back to stock little movements make big changes unlike my dad's bike. I thought it was my throttle hand until I got on his bike. Bike has 0 smoothness in the throttle past I say 3-4.5k rpm
 
Djmurria said:
I clicked on that link and kfr 4 says gps mine has been acting weird. It'll say neutral but if u rev it with kickstand down bike will cut off when neutral light goes off would that be causing the issue. I did have the clutch in set at 7200 to help launch but even then just a really tiny bit goes from 5.5-6k to banging on the 2 step hard. Flashed back to stock little movements make big changes unlike my dad's bike. I thought it was my throttle hand until I got on his bike. Bike has 0 smoothness in the throttle past I say 3-4.5k rpm
Click to expand...
Now it sounds like might be getting somewhere. Try bypassing your kickstand switch, my old srad had a bad wire at the switch and when going into some turns or when cruising it would trip and cause the bike the shut off momentarily and right back on and feel like a jerky throttle. I went after cable adjustment and a bunch of other stuff before I found it and couldn't believe it was the actual issue.
 
Dopey said:
Now it sounds like might be getting somewhere. Try bypassing your kickstand switch, my old srad had a bad wire at the switch and when going into some turns or when cruising it would trip and cause the bike the shut off momentarily and right back on and feel like a jerky throttle. I went after cable adjustment and a bunch of other stuff before I found it and couldn't believe it was the actual issue.
Click to expand...
Can i just connect the wires together or does it need a resistor of some kind too? Thanks for the help btw going to give it a try.
 
My speedo is weird too some seconds it'll seem to read fine but usually it's bouncing between 150 and max going normal speeds. My dad's bike has been fine with no speed sensor but my bike tge speedo is weird it'll move even if u just rev the bike and it's sitting still tire on ground
 
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