Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > 851 / 888 > Bike Running Real Bad

[Herb]

I changed my 750 SS to NGK iridium plugs and it also ran like a dog. It would not pick up cleanly, and was hesitant at part throttle openings. Following a search here I experimented with larger spark plug gaps but to no avail. I know other people have found improvements using them, however I went back to standard plugs and all is well again.

[paynep]

If all of the above fails, it might be worth checking the throttle position sensor (TPS). if this is playing up or has come loose the ECU can be fooled (fueled?) into thinking the throttle is open more and hence supplies more fuel, so you open the throttle more to clear it etc etc......

HTH

[phil_h]

Sounds like its only running on one - common cause of fuel smells - does it vibrate too ?
Even new plugs can be duff -especially if you buy them cheap
I run iridiums and they are fine.
Take both plugs out and see what colour they are and report back !

[Big Duke 6]

ok cool, i'll check the plugs, fuel filter, breather pipes, it does feel like its running on one cylinder rather than a missfire...sorry to be a thickie but where would the throttle position sensor be? I'll also try the old plugs. Also pretty sure the battery isn't charging properly as I run it every day but the battery is running down. Cheers

[loony888]

if the charging system isn't working properly, start there, these bikes will not run well with a low battery and/or poor charging circuit. check the voltage across the terminals at 3000 rpm, should be around 13 to 13.5 volts, if it's lower than 13 check the connections from the alt to the reg/rec and earths. also check it at idle and see if the voltage rate rises when you bring the revs up. if you aren't getting any charge, chances are the reg/rec is fried. there are excellent aftermarket ones available for a lot less than genuine.

[Big Duke 6]

Loony whats a reg/rec...is that a regulator rectifier? I'm guessing here.... I don't think there is a Haynes type manual for the T8, I have the workshop manual which I have downloaded, can anyone recommend a clearer maintenance guide, cheers?

[weeveetwin]

Big Duke 6

It does sound like the regulator/rectifier is kaput. You'll find it attached to the frame just beneath the clip which holds the forward edge of the fuel tank down. Remove the black plastic cover under this clip, and the regulator is just there - it's fastened to the frame with two bolts.

Replacing it is easy (if you buy an Electrex replacement, you'll find simple printed instructions in the box). It's a half-hour job at most. (..and it'll cost you approx. £70).


ps. I'm surprised you didn't get warning of this being about to happen. Usually, the red 'generator' light on the dash flickers as the revs drop.