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Old 11-05-2012, 09:06 PM   #1
andergar
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How to cold start

Okay, I guess I'm a dumbass. I've had my '98 750 for three months and still can't figure out the right way to cold start my bike. I've tried full choke, no twist of the throttle, 3/4 choke, 1/2 choke....... So please help an old monkey out and share the "secret". I've looked on YouTube and it always seem, guys just walk up, hit the starter and boom. Thanks in advance for any advice.
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Old 11-05-2012, 09:48 PM   #2
yaksha79
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Re: How to cold start

What's a choke?? lol Bikes are like women what turns one on won't always turn the next one on. Have you tried no choke? I had an old nighthawk that idled so rich that it didn't ever want choke. good luck
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Old 11-05-2012, 10:38 PM   #3
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Re: How to cold start

I think someone told me the choke leans it out?
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Old 11-05-2012, 10:54 PM   #4
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Re: How to cold start

This will be interesting to see who understands it.... Of course the op is FI, but in terms of carbs or FI there is considerable confusion.....
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Old 11-05-2012, 11:04 PM   #5
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Re: How to cold start

isn't the FI lever more of a fast idle kinda like the unrestricted Busas have? but yea I was referring to crabs only... :-)
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Old 11-06-2012, 02:11 AM   #6
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Re: How to cold start

From what i've understood the FI bikes are fast idle and carbs are choke........When choke is on, it gives a richer mixture, by restricting the air, though if the carbs are set up right, there is rarely a need to use the choke.
In my little experience, anyway.
Will no doubt, be corrected by the guru's, if wrong!
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Old 11-06-2012, 04:45 AM   #7
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Re: How to cold start

Quote:
Originally Posted by Armi View Post
From what i've understood the FI bikes are fast idle and carbs are choke........When choke is on, it gives a richer mixture, by restricting the air, though if the carbs are set up right, there is rarely a need to use the choke.
In my little experience, anyway.
Will no doubt, be corrected by the guru's, if wrong!
Def need the choke around here
Also heard the choke called an enrichment circuit I believe.
FI what is that?
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Old 11-06-2012, 06:31 AM   #8
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Re: How to cold start

How does it restrict the air, ARMI?
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Old 11-06-2012, 07:24 AM   #9
dj_smurph
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Re: How to cold start

I think I know
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Old 11-06-2012, 07:59 AM   #10
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Re: How to cold start

It's quite complicated Chris but I shall do my bestest

You see choke is required when cold, right.
Henceforth the air is denser, so less of it is required.
By using the choke lever, you create a vacuum, which , in turn draws less air

I could write a page on this, don't cha know
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Old 11-06-2012, 08:11 AM   #11
le skid
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Re: How to cold start

Wow
People keep SAYING what it is and yet everyone's afraid to commit to their answer and sound stupid, which makes this funny AND ironic
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Old 11-06-2012, 08:42 AM   #12
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Re: How to cold start

This is all funny.....I hear more bs answer here, and on this subject in general, and I always let it go..
Ok...let's start with what the choke actually mechanically does on our mikuni carbs...and you guys who think you understand physics....and no googling allowed, take it to the next level;
You pull the choke lever
Cable operates on the ckoke slide linkage
Choke bar slides open (left)
Choke plungers open (slide left)
Now a passage is open from the vacuum chamber above the slide piston diaphragm to the carb venturi on the engine side of the mechanical butterflies

What affect does this retult is.......direct and indirect
So far no one has been close
No research.......use you f-ing mind
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[QUOTE=senator8]Haha! You're more than 1%. My bike ran perfectly all year. All I did was oil changes and thumbed the starter. While my competitors had bikes and carbs in pieces at the track I was enjoying a coffee and saying "thanks Chris"
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Old 11-06-2012, 08:53 AM   #13
Armi
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Re: How to cold start

Ok........first to admit, i did do a quick google.
Wish i hadn't now.
I'm gonna get my spare carbs and have a closer look at them and get back to you...
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Old 11-06-2012, 09:09 AM   #14
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Re: How to cold start

Ok...there is no fuel above the slide in that chamber....so there is no fuel coming out the choke passage....so the direct affect is NOT to add fuel.
That is your hint...
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Old 11-06-2012, 09:27 AM   #15
correll1000
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A choke does not ADD fuel....it RESTRICTS air flow....on a carb anyway. On my old single barrel 79 f150 all u had to do was put ur hand over the carb inlet to "choke" it out when it was super cold. and waalahh...she fired right up...it was just a pos rock crawler.....hence no choke cable or choke butterfly on top of carb...hope this help a little

Last edited by correll1000; 11-06-2012 at 09:32 AM.
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Old 11-06-2012, 09:55 AM   #16
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Re: How to cold start

More passthrough so the slide doesn't lift, blocking air flow allowing more fuel?

Or back asswards.

Less restriction allowing the slide to lift easier raising the needle allowing more fuel.


All depends on where choke hole is located? Not much experience with bdsr's
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Old 11-06-2012, 11:02 AM   #17
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Re: How to cold start

I allways tought that the choke mechanism would allow more fuel in the same conditions.

I'm not sure why, but from what ccmhunt wrote, if there is an opening from the engine intake to the vaccum chamber, it would create more vaccum, lift the needle higher then letting more fuel in at the same rpm.

To the OP...that on the left handlebar is a fast idle, it's not a choke, altough it is used to help starting in the cold. My FI 750 has that too, and sometimes she is a bitch to start in the cold weather. Try making the pump prime two times, and blip the throttle while pressing start. Still, a bitch to start but helps a bit.
If she is very very hard to start then I would check the valves, throttle sync, and ECU repro if you are using aftermarket filter+exhaust...

Last edited by tmp; 11-06-2012 at 11:04 AM. Reason: Vaccurized unreason
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Old 11-06-2012, 11:04 AM   #18
dj_smurph
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Re: How to cold start

I thought it closed a butterfly in a bypass through the carb therefore enrichening the air fuel mix.
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Old 11-06-2012, 11:09 AM   #19
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Re: How to cold start

On my aprilia rs125 opening the choke opened up an extra jet to allow more fuel to flow.
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Old 11-06-2012, 11:17 AM   #20
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Re: How to cold start

sub'd for explanations
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