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May 23rd, 2004, 11:17 AM   #1
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Idle When Hot

2002 FC470e. The bike does not want to idle after a long moto(20mins). I have the idle screw almost all the way in. Other than this the bike is perfect. Starts and runs fine.

I noticed this after a stall. Any ideas. The bike has about 20 hours and is stock.

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Les
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May 23rd, 2004, 06:28 PM   #2
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Crud in the carb idle circuit?? Vacuum leak at the carb intake manifold boot??
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May 24th, 2004, 12:55 AM   #3
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the bike needs a lean mixture when it's hot after a race. if it's too rich it'll stall when hot but not when you simply put heat into it from cold starting.

you need to lean off the idle so half a screw in with the pilot screw methinks.

Taffy
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May 24th, 2004, 02:36 AM   #4
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Re: Idle When Hot

Originally Posted by lesmoto
I have the idle screw almost all the way in.
To asked a stupid question:

Which screw are you referring to? The mixture screw or the idle speed screw?

Do you know what size jets you already have in the carb?

Cheers,
Simon
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May 24th, 2004, 04:06 AM   #5
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The idle screw is almost all the way in. Air screw is 1 turn out. Pilot is a 33 with a 190 main.
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May 24th, 2004, 06:36 AM   #6
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Originally Posted by lesmoto
The idle screw is almost all the way in. Air screw is 1 turn out. Pilot is a 33 with a 190 main.
Now, unless you're riding around with a completely clogged up airfilter, I would guess you're not suffering from running too rich (on the idle circuit anyway).

Because you have the idle speed screw almost all the way in, I suspect the vacuum is causing the main circuit to come into play - e.g. because the slide is held so far open even when the thottle is closed.

It may also be a worn needle, so check this too.

Here's what I would suggest after you have confirmed and written exactly what your settings are now so you can go back:

1. obviously check all connections as suggested above to make sure there's no leak or similar in the intake, as well as check the airfilter and clean the carb - but you've probably done this already.

2. after starting the bike take the idle mixture screw out to 1.5 turns and then screw out the speed screw, noticing the difference in engine revs.

Set when you get to a good even idle at around 1800rpm.

Hope this helps.

Simon
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May 24th, 2004, 08:52 AM   #7
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are you, like i was; always adjusting the tappets open? you may have "tuliped" valves? also your camchain-if not replaced already-will be shagged out by now so go check it.

Taffy
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May 27th, 2004, 11:00 AM   #8
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Ok guys, I checked all the places for leaks, cleaned the card and set the valves(they were fine) . With the bike warmed up, mixture screw 1.5 turns out, to get bike to idle i have to almost bottom out the idle screw. What is interesting if i screw in the mixture screw all the way in---the bike revs up. I thought turning the mixture in produced a righer conditon.
Maybe i should leave well enough alone as the bike starts(button or kick) and runs perfectly.

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Les
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May 27th, 2004, 12:23 PM   #9
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les

i'm not sure you know how to set the carb.

you must set the mixture screw to the level that makes the bike rev the highest. turn the idle down, adjust the mixture screw AGAIN for highest revs and then again set idle screw.

when all this is done on a nice warm engine you can now go for a ride and do it again.

then if you have a cough you should find that 1/4 to 1/2 turn of the mixture screw gets a smooth bike on the gravel.

keep the screw driver in ya pocket-no gloves = 10 minutes work.

sorted.

Taffy
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