I have a doubt when de engine is cold

[MagnusXII]

Hi everyone. I have a pro link bike and when it stars, i have to hold the throttle more than 10 minutes because if not, it stops. After that, when the engine is hot it works fine. Another problem is when i leave it more than three days without starting, then it is difficult to start to the point of running out of battery. Is it normal?
Any help?

Thanks

[Larry Zimmer]

There are many others who know more than I and hopefully can help. However, my thought is that your carburetor choke mechanism is not working.

[MagnusXII]

There are many others who know more than I and hopefully can help. However, my thought is that your carburetor choke mechanism is not working.

Thanks for your answer, is there any way to check it? And where is it placed exactly.
It's been my father's motorcycle and now I'm updating it.

[daves79x]

You need to do a comprehensive recommissioning of the entire motorcycle. This starts with a complete carb rebuild. Then you can address the quirks these bikes have with starting from that perspective. Your very slow warm-up is indicative of clogged idle/slow speed circuits, as is partially the very hard starting. The vacuum valve hurts you there, there are ways to overcome that. But it is doubtful your accelerator pump is working at all. It is your friend when cold starting if it is working. But you must have the carbs correctly functioning to realize the best starting.

Dave

[CBX-tras]

+1, strongly advised, of what Dave said, above.

[MagnusXII]

Thanks very much, at least I know where to start

[MagnusXII]

You need to do a comprehensive recommissioning of the entire motorcycle. This starts with a complete carb rebuild. Then you can address the quirks these bikes have with starting from that perspective. Your very slow warm-up is indicative of clogged idle/slow speed circuits, as is partially the very hard starting. The vacuum valve hurts you there, there are ways to overcome that. But it is doubtful your accelerator pump is working at all. It is your friend when cold starting if it is working. But you must have the carbs correctly functioning to realize the best starting.

Dave

Where is the acelerator pump located? Is it posible to have a picture of it?
Thanks very much

[Jeff Bennetts]

Magnus, start here. viewtopic.php?f=20&t=12604

The forum has many sub forums that are broken down for each technical category for the repair and maintenance of your CBX, everything you seek are in those sub forums.

Click on the Board Index icon, top left of the forum homepage. index.php

[80 cbx dude #6216]

Hello Magus, perhaps look into the fast idle cam adjustment for carbs. I had a similar problem years ago and found that the fast idle cam was out of adjustment and would not 'lift" the idle speed when the choke plates were closed.
Mike

[Dynamohum]

Starting my Prolink is similar to my last one. Cold or not, if it was started the day before, it fires right up. A minute or so on choke and it idles fine. Throughout the day on tour, starting it several times it also fires up instantly w/o a choke. The choke is only needed when it hasn’t been run for days or weeks. Daily cold morning starts, even frosty mornings in Montana, it fires right up with minimal choke. So, nothing mechanical changes from day to day so why is it harder to start if it hasn’t been started recently? Fuel, air and spark are the same and I don’t get it. I’ve managed to put tens of thousands of miles on CBXs with this same condition w/o taking the carbs off for a rebuild. It’s really not much of a bother, it just spins a few seconds longer when cold before it fires up. I’d also venture to say that most owners don’t have the ability (expertise) to remove and replace the carbs. And w/o a tuner/mechanic to set everything up after, well you see the quandary.

[Larry Zimmer]

One thought: assuming you still have the stock vacuum shutoff valve in the fuel line, it needs to crank a bit to get fuel into the carbs. Depending upon how long it has set if you do not drain the carbs. If you drain carbs, it will definitely have to crank a bit to fill the bowls. Beyond that, I would mention that a 'sitting' bike is sensitive to choke setting depending upon how long it has sat and the temp that day. My 82 is sensitive to choke setting. It will 'over choke' even after sitting several months.

[Dynamohum]

Over choke?