907ie misfire - maybe a cure???

discussions specific to the 907IE
Posts: 90
Joined: Fri May 01, 2015 9:31 pm
model: 907 I.E.
year: 1991
Location: Australia

Re: 907ie misfire - maybe a cure???

Post by Bluey »

+1 I'm another convert to this simple solution. I ended up using a small wad of fabric cotton and while the miss is still "there" i actually find myself riding in the dreaded rpm zone for hundreds of metres before i notice that the bike isn't as smooth as at other times. Unlike previously when you simply had to change up or down gear to get out of the rpm range.

and for the record the bike is has additional holes cut in the airbox, no airbox snorkels and staintunes.

I've a strong feeling that an unmodified airbox and snorkels will help too... will update that once i get around to fitting them.

UPDATE: I've just fitted an un-modified airbox lid and the two factory air snorkels. It did improve the situation further so now the dreaded miss is the smallest little bump in otherwise smooth power. for example by contrast it's smoother to ride at constant throttle between 3500 and 4000 than it is just above idle to 2000 (where you get lots of driveline shunt) for example, and for a twin that's pretty good.

I also noticed that without any changes to idle setting (throttle stop etc) i've picked up about 200 rpm at idle. So the air flow has changed at idle too... i'm guessing that to be more/better flow at idle on the expectation that the computer is running the same richness it always has, but my logic might be flawed.
Last edited by Bluey on Fri Jun 12, 2015 1:05 am, edited 2 times in total.
Posts: 39
Joined: Sat Jan 15, 2011 9:09 am
model: 907 I.E.
year: 1992
Location: wanganui NEW ZEALAND

Re: 907ie misfire - maybe a cure???

Post by oceanhunter »

Can you say if your air box has been opened up,when I picked up my 907 it already had the ultimap installed
and the air box opened but I noticed on reflection that when I installed a K&N it was slightly less snatchy
at 3 to 4000 revs!I wonder if this has lessoned the vacuum pulses?Cheers for sharing your diagnosis/head ach.
"keeping the shiney side up"
Posts: 40
Joined: Mon Jun 01, 2009 6:33 am
model: 907 I.E.
year: 1993
Location: Leiden, The Netherlands

Re: the are two sensors on the air box...

Post by g.m.c.janssen »

Laddie wrote: Sat Sep 22, 2007 2:16 pm
I was lucky and picked one up cheap - they're about $500 from Ducati. It is the same unit from a Peugeot.
already quite a long time that you did post this. I found this in the Netherlands. Could it be the right one? It looks the same as from the 907. It should fit Peugeot models, but also Fiat, Alpha and Lancia models
https://www.winparts.nl/sensoren-elektr ... 73249.html
Laverda 750SF, 1972
Laverda 1000 3CE, 1974
Moto Guzzi LeMans 3, 1983
Ducati 907 i.e. 1993
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