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Breva 750 'hickups'

RJVB wrote:
Am I over-analysing again?
Click to expand...

Yes.

Since the reset is electronic, the information wouldn't be of much value. That is, even if you know it, what can you do with it? Unlike the 15M and 16M where the guys at MPH have provided this valuable information http://www.mphcycles.com/Technical/tpsexcel3.htm With those systems, the TPS is manually set and the voltage curve can be checked.
 
john zibell wrote:
Actually the readings are in millivolts. The ECU/VDSTS/Axone/navagator convert the voltage reading to degrees.
Click to expand...


:blush: I should just keep my mouth shut.
 
In my view, information is never without value, even if it can't be exploited immediately. And if it does turn out that fluctuations in the on-bike electrical circuit cause fluctuations in the TPS reading, causing the ECU to "think" the throttle opening is changing while in fact it remains dead constant, which in turn cause more ... <etc etc, close circle> ? At least we'd have a better idea what's going on, and what is NOT a cause and, possibly, where to try to modify things to alleviate the issue.


I agree, it seems far-fetched. The problem with instable systems is that you often only realises you created one when you run into inexplicable behaviour
 
I was afraid that it might be an ECU issue. I found the one on ebay. It's in South Africa - about $100 including shipping. You hear of so many of these brevas having similar problems, loss of power, stalling at stop signs, hard starting. I wonder if it might be a general ECU problem. I could be swapping a bad for a bad.
 
Eric wrote:
I was afraid that it might be an ECU issue. I found the one on ebay. It's in South Africa - about $100 including shipping. You hear of so many of these brevas having similar problems, loss of power, stalling at stop signs, hard starting. I wonder if it might be a general ECU problem. I could be swapping a bad for a bad.
Click to expand...

Buy it quick. The darn things are about $900.00 new.
 
Ok. Here's something interesting. The battery reads 12.8 volts when running but the VDSTS indicates 11.4 volts.
 
Eric wrote:
Ok. Here's something interesting. The battery reads 12.8 volts when running but the VDSTS indicates 11.4 volts.
Click to expand...

The VDSTS only reads what the ECU reports. Apparently the ECU you have isn't a very good voltmeter.

Just out of curiosity, have you checked the connector that goes to the ECU?
 
John, I agree this seems a big difference, but have you seen samples where the ECU gives an (almost) exact reading? I know that on my Norge, the reading on the dash (presumably the one from the ECU, or one determined by the dash. comp. in a similar manner) is what I'd call significantly lower than a reading on the terminals with a volt meter.
 
john zibell wrote:


Just out of curiosity, have you checked the connector that goes to the ECU?[/quote]

Yes. nothing seems out of the ordinary. I ordered the used ECU from ebay. It's in South Africa. The shop said it came out of a bike that ran low on oil but it was running well up till then. I'll let everyone know what happens.
 
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