97 vfr fuel system

I have a 97 vfr 750 and it is starting to give me trouble, hope some one can help. After I start the bike with full choke and let it run for a little bit it does not climb in rpms (with full choke) Also while it is running the exhaust smell funny like it is running rich or something, If I try to start rolling off the choke it stalls out. Even if I try adjust the idle scew in side the faring I have to go all the way in with it to get it to a point where I can take the choke all the way off. any suggestions

 

Ah, had the same thing by what you're explaining happen to me, took the bike in and they found that one of the rubber plugs that covers a vacuum port for syncing the carbs was missing, so what I had was a vacuum leak. not a choke problem as it too wouldn't ramp up and ran rich. Does this if you where to ride it sort run ok once say above 3000rpms? Mine did all though it sound a bit off and was low on power but it did move. so I went and changed the plugs to no avail. For me it was time for the 32K service too, so that was done as well. Since rubber breaks down over time good time to check all things out.

 

Thanks for the info I will look itno that I have 22,000 miles on mine so it is time to get into some of those things thank you

 

you don't need choke to start a properly-tuned and running VFR in warm summer months.

TO avoid your situation, just try to use the idle adjustment to boost initial running speed instead of the choke.......

 

^ Mmm beg to differ, mine is as good as it can be tune wise, and it stills takes a wee bit of choke even if it's 90 outside if it's sat more than 4+ hours. Now granted it starts right up when it's only been a couple hours since it ran, yes no choke then, but when she's cool it helps it pop right off.

 

Since this problem started, it will not start without the choke, even with the throttle screw all the way in. I do know what you are saying and both of you are right in what you saying about the choke. Either way it is still running like crap. Thanks to both of you

 

Starting problems 97 VFR

Hello brother VFR owner,
Sorry to hear about your choke dilemma.
The people on this site are very helpful and informative with their own experiences,

Its difficult to diagnose an engine without having it on hand,
But If you can provide a little more info I'm sure you will get more input.
More information makes "Diagnosing" a problem much easier.

Many factors affect engine performance, I like to use what in the medical field is called "S.O.A.P."

(S)ubjective ,
Begin from the beginning, You have a 97 VFR, lets go from there, tell us
Everything about your bike, Make, model, miles, maintenance, year aquired, is it factory stock or have you made any changes since 1997?

(O)bjective,
what if anything happend just prior to the problem?
Recent mechanical changes, exhaust, jetting, plugs, lengthy storage,
Or did the problem just begin out of the blue?
Is there anything that helps reduce the symptom?

(A)sessment
Here is where all the previous information leads you down 1 or more paths to adress what the problem actually could be .

(P)lan
Taking all the previous information into consideration,
Here is where you make a plan by process of elimination to address each symptom of what is wrong and what if any change makes the symptom better, worse or has no effect.

I have a 94 VFR (same bike as your 97) I also have a 98 VFR800fi (completely different) and had a 1990 RC30 (very different ) so I have wrenched on 3 different Honda V4's.
Without any more information I can tell you that a factory stock 97 VFR that is cold needs the choke on even at 80'F to start easily,
Once the engine is warmed up it should perform worse with the choke on or something is wrong.
With the choke "on" you are reducing the carbeurators air flow intake.

The stock carbeurated VFR750 is meant to operate in a broad spectrum of weather conditions.
Idle adjustment is not meant to cure anything except extreme changes in altitude of operation or air temperature , cold air is more dense which makes the engine run more leen Hot humid air at sea level has less 02 which makes an engine run more rich (less air) thus less likely to need the choke to start.

Honda put the idle screw there to compensate for these extremes, sometimes if you are overdue for service you can compensate for an engine that falls off idle with the idle screw, But compensating for an engine or carb problem with the idle screw does not fix the problem.
Good luck with your bike,