my cbr250r went thru an engine cut-of phase
during first periods of ownership [used, almost new]
within which the only difference to later cut-out free
years was beginning using higher octane petrol
[shouldnt be a factor] and failing to go thru
the recommended start up procedure..
last motorcycles not, ecu managed, not fuel injected..
so i would start up as for carburetted hondas
including blipping throttle, and not allowing revs
to drop to the 1500 they will settle to, if allowed..
mine were typically after acceleration then shutting off
throttle and cluth in.. for eg, uphill, [under load]
accelerating then car in front hits brakes, causing
me to brake, throttle off, clutch in..
the situation i was able to replicate [once]
was accelerating up my home street in second
after entry turn, then throttle off, brake,
clutch in for final arc across and up before
backing into the kerb of my park..
this is the same report as previously here
on this long running subject..
at first i thought it rider error, being new to this
honda and after a break from riding, but that
was a false assumption [lifelong honda rider]..
the best i can make of it including from member
advice here etc, is ecu mangement of lean tending
fuel injection, including quick shut off of fuel
when throttling off, as part of fuel economy..
at least i was able to deliberately replicate that
in my regular home street ride..
one thing there being that i had to deliberately
and fully throttle off,, as after learning that
motorcyle, i was not shutting off throttle
completely.. only a small thing, but
apparently a factor..
if that was a general reality [for me] then it wasnt
a conscious thing, as in making allowance for
engine shut off.. my riding and throttle use
were more or less normal, nothing special..
in the replicated cut out, i shut throttle
fully, snapping it shut..
the cut out phase [not a consistent thing at all]
faded out after only two identifiable changes,
switching to 91ron no ethanol petrol,
and using startup routine as recommended
by members here [had no owner manual]..
which i did religiously thereafter including
with [replacement for 'black beauty'], a new
cbr300ra, which has only 500km up
but has started first touch every time
[like 250] and has never cut out..
repeating that start up [yet again]
dont touch throttle..
neutral, ignition on, wait til she cycles thru,
which you will hear, then press starter..
revs will go to 2000rpm, then slowly
lower to just over 1500rpm, then
finally settle on 1500rpm in a
steady 'heartbeat' [hear that too]..
then you can take off..
some like to wait til one bar
indicating coolant fluids are
up to that temp. some take off
riding easily til their bar/s appear..
seven threads from search 'engine stalls'
on cbr300r forum.. different contexts in some..
go to cbr300r forum enter 'engine stalls'
in 'search'..