newbee rocketeer . . already need help!

Adjusting is really easy. I found if you just nip the screw it's easier to make small adjustments but watch out as it creeps a little on final tightening. You should be able to anticapte that though.

Also worth checking your throttle bodies balance. If you have to adjust them you'll need to do the TPS again. Not sure if you said you had or not but ISCV also.

warp9.9 said:

I run 40 in my Front Avon but might not be aggressive as you are in the curves. Still seems fine above 160 in Illinois sweepers

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More than likely , I'm just heavier !
160 , wouldn't that be illegal ? Never catch me breaking the law .

Reckon he means kph not in your case mph

Blackthou said:

Reckon he means kph not in your case mph

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Knowing Scott - he means MPH. The 450bhp Falcon has to fly.

warp9.9 said:

John, Been pondering about this and beside the TPS which might be giving you grief. I also have been working with another SC guy who is having the same problem at lower engine speeds just off idle. Anyway beside what I sent you in your message from the other site. How are you balancing the throttle bodies with no map sensor. I went cheap old school on mine but it worked. When you see the part in the book on balancing them and how it can not be done with vacuum ignore them



Of course you can get a bit better then this one but I was experimenting and found it worked a bunch better then not being able to balance them at all without a map sensor.
anyway back to my coffee

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Great. I have a set of gauges so I will hook them up after fitting the new TPS today.

Unpredictable throttle sorted.

To recap my issue - 2004 rocket III with TTS supercharger, after a long motorway trip, rolled off throttle on slipway and bike stayed at 2000 RPM. Quickly got worse. Bike had a steady but low tickover at 550 RPM. Anywhere between tickover and 2000rpm, bike would lunge, stall and backfire - very dangerous riding around town - but ran perfectly above 2000rpm.

Interweb research suggested the Primary Throttle Sensor (TPS). It was going to be difficult to set up a new TPS, due to MAP sensor and Idle Stepper Motor being removed during SC fit; therefore you could set the TPS at 0.6v, but the ecu will not be able to adapt, as the rest of the ISCV reset can not be performed. Also the engine warning lamp was permanently on.
After fitting new TPS and setting to 0.6v with TuneECU software, did 12 minute tune and rode to test. Bike was just as bad; lethal to ride slow. After much pulling of hair and trying several other things which did not help, I solved it.

The TPS had been set accurately to 0.6v. I now ignored this and tried twisting the TPS slowly at tickover. This raised the tickover to a sweet 800 rpm. I then gave a twist on throttle and the hesitation seemed to have gone. A quick test ride later and amazingly the bike is as smooth as me grannies gums. Not sure what the voltage is at the TPS . . . but who cares.
My analysis is that the TPS must have long ago been reset , during the SC fit. It had failed after 7500 miles, giving my 'unpredictable throttle response' problem. When I replaced it, I set it at 0.6v - which was wrong.

Anyway, thanks to all who have helped work this out; hope this saves someone a few hours time.

Welcome from Maine, very nice ride, you may want to record what the voltage is for reference, incase you have to replace the tps again, you'll know where to start.

Hoopla