CBF250 cold start issues

i recently purchased a 2006 honda CBF250, I find it very hard to start
in the mornings. im not sure if there is a problem with my bike or
not.

i put my choke on full. and try to start the bike. however it wont
successfully start until i give it some throttle. is this normal?
because it doesnt seem like the choke is doing very much.

i then have the problem where if i back off on the choke or throttle
too quickly the engine dies and no matter what i do i cant start it
for a couple of minutes. again, is this normal?

yet, all this being said, if the engine is atleast warm i can put the
choke on to say 1/2 and it will fire up to anything from 3000 -
5000rpm without me opening the throttle to obtain the revs. makes
starting very easy.

any advice would be much appreciated.

thanks,
The_Deviant

 

I don't know the bike nor the answer but, I wouldn't have thought there
was a problem, if it's carbies.
Engine cold... choke on full and throttle it to start. Choke sets the
richness but throttle increases throughput of unprimed fuel system.
Engine warm... part choke, possibly causes throttle to open a smidge
which is all that's required, given the fuel system is still primed.
What morning temperature are you talking anyway?
MikeH
(no mechanic)

 

Try experimenting with the choke, give it a little, then give it a little
more if it doesn't start and so on from there
try not to use any throttle, but if that doesn't work, you may have to.
Same bikes with different people can show different tendencies.
It is just a case of getting used to your bike if it has any idiosyncrasies,
you will get to know them

 

A choke restricts air flow. Opening the throttle increases air flow.

You have too much choke on for the temperature, trying pulling it on
less.

Yes that's called flooding it. You've got more juice than air in there
and that makes it hard to restart.

If you've got to hold open the throttle to start it then you need to
keep playing with the throttle to keep it alive for a bit after it's
going until it warms up.

You shouldn't need choke on a warm engine.

JL

 

I used to have a similar problem with cold starts (Honda VTR 250) and
the amount of choke I was giving it was definitely contributing to the
problem. Once you get yourself convinced there's a problem starting
you may find yourself experimenting by giving it a bit more choke...
and you could now be a part of the problem. Don't blip the throttle
before starting (or before killing it the previous day). Don't give
it any throttle whilst starting. This morning was 8 deg C and I put
the choke lever to 50% and held in the starter. It started after
about a second. What state are you in? When is the next service due?

 

typical honda thing, only give it a smidgion of choke if its really
cold, but try it with out the choke.

 

thanks for the help. ill give all the options a go over the next few
days and get back to you.

im in Victoria, and its about 10 degrees or so when i try to fire it
up.

it was serviced at about 15000K's due for the next at 20 000K's. its
currently at about 17500K's

thanks,

The_Deviant