evening all
got my 1997 CB400sf in summer, and never needed choke to get it going.
however, now its getting a bit colder (kept outdoors) without choke it won't start.
But, with full choke, it stutters, won't catch and then I usually get a big "phut" out of the exhaust.
after several more cranks at various choke levels, it catches.
SO - does anyone have any tips on cold starting?
Maybe I should start with just a bit of choke, and build it up?
thanks
Ian
CB400sf - starting with choke
Forum rules
Please can you post items for sale or wanted in the correct For Sale section. Items / bikes for sale here will be removed without warning. Reasons for this are in the FAQ. Thanks
Please can you post items for sale or wanted in the correct For Sale section. Items / bikes for sale here will be removed without warning. Reasons for this are in the FAQ. Thanks
-
Mansie
- Settled in member
- Posts: 100
- Joined: Thu May 08, 2008 10:19 am
- Bike owned: CB400 Four NC36, NT650V
- Location: Cambridgeshire
- Contact:
Re: CB400sf - starting with choke
Hi,
I don't have the same problems as you have: Full choke is not a problem but then my CB400 has 4 exhausts! On full choke it roars at 4000 revs. Then I slide it back to ~3000 revs. No choke would be ~1200 revs. Sounds like you certainly have to be easy with the choke and not give it the full load.
Cheers, Mansie
I don't have the same problems as you have: Full choke is not a problem but then my CB400 has 4 exhausts! On full choke it roars at 4000 revs. Then I slide it back to ~3000 revs. No choke would be ~1200 revs. Sounds like you certainly have to be easy with the choke and not give it the full load.
Cheers, Mansie
-
ian
- Settled in member
- Posts: 18
- Joined: Fri Jun 27, 2008 9:54 pm
Re: CB400sf - starting with choke
cool
I've tried starting with a tiny bit of choke, and building up (rather than starting at full) and it seems to be working a lot better - catching straight away.
too used to car chokes that need to be out full.
cheers
Ian
I've tried starting with a tiny bit of choke, and building up (rather than starting at full) and it seems to be working a lot better - catching straight away.
too used to car chokes that need to be out full.
cheers
Ian
-
superfourben
- Settled in member
- Posts: 96
- Joined: Sat Apr 05, 2008 10:45 pm
- Location: Brighton & Hove
Re: CB400sf - starting with choke
If I use the choke to start in the coldest part of winter I only use a small amount, but generally I hit start and give it a small amount of throttle, keep it at 2-3000 revs for a few seconds and it is fine idling after that. :)
-
alexibrow
- Settled in member
- Posts: 173
- Joined: Wed Apr 30, 2008 8:19 pm
- Location: Brighton & Hove
Re: CB400sf - starting with choke
Mine starts on full choke and revs high at around 4000rpm so I close the choke about halfway for a minute or so, then close it all the way where it runs happily at around 1200rpm.
-
ian
- Settled in member
- Posts: 18
- Joined: Fri Jun 27, 2008 9:54 pm
Re: CB400sf - starting with choke
I finally got to the bottom of this
the bike's poor starting and use of choke was down to an old connector I found under than rear cowl.
I think it was running an old scot oiler, but this had 6v on it, and was draining the battery each night.
therefore, each morning the battery was quite low, and so not turning the engine fast enough.
When I removed the offending connector and charged the battery up, it started first time with hardly any choke.
So, for any poor starting I'd say check the battery power before attacking the carbs.
Ian
the bike's poor starting and use of choke was down to an old connector I found under than rear cowl.
I think it was running an old scot oiler, but this had 6v on it, and was draining the battery each night.
therefore, each morning the battery was quite low, and so not turning the engine fast enough.
When I removed the offending connector and charged the battery up, it started first time with hardly any choke.
So, for any poor starting I'd say check the battery power before attacking the carbs.
Ian