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High RPM idle

This is a discussion on High RPM idle within the Yamaha YFM350 Raptor/Warrior ('87-Present) forums, part of the Performance /Technical category; Hey guys I finally got the beast to run! But the idle RPMs are pretty high. - First thing I tried was the idle screw ...


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Old 11-05-2010, 07:34 PM   #1
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Default High RPM idle

Hey guys I finally got the beast to run!

But the idle RPMs are pretty high.

- First thing I tried was the idle screw (duh). It idled higher when in but never went down to normal when I screwed it out.

- Tried the Air screw, same result tried it all the way in and came out 1 turn at a time and no change to RPMs (or very minor changes)

- Checked for air leaks. Screwed down Filter box top, still high RPMs

P.S. I rebuilt the carb and it has a brand new idle and main jet. EVERYTHING is STOCK on the bike.


Suggestions?
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Old 11-05-2010, 08:50 PM   #2
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Make sure the choke plunger is seated. Also check the throttle cable to make sure you have slack, and its not holding open slightly.
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Old 11-06-2010, 01:18 AM   #3
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Quote: Originally Posted by 06vmax View Post
Make sure the choke plunger is seated.


I am not sure what you mean. It seems like its pushed in all the way. In or out the high RPMs seem to be the same.
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Old 11-06-2010, 12:11 PM   #4
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Quote: Originally Posted by david6789 View Post
Quote: Originally Posted by 06vmax View Post
Make sure the choke plunger is seated.


I am not sure what you mean. It seems like its pushed in all the way. In or out the high RPMs seem to be the same.
Just make sure its not hanging up and holding open. If it makes no difference when in or out, then some things not right with the carb.
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Old 11-06-2010, 01:08 PM   #5
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Yah thats mine thinking too now.

There is no change to RPMs when I pull the choke out or push it in.

I let it run for 2 mins and then shut it off, and it backfired. Scared the s#@t out of me.
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Old 11-06-2010, 03:30 PM   #6
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I have yet to put an air filter in. But the box is hooked up to the carb and the box lid is on tight.

Would the lack of a filter cause high RPM idle?
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Old 11-07-2010, 07:30 AM   #7
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Well the previous owner has apparently Debaffled the muffler and I am running rich. My Spark Plug is Black and sooty.

Suggestions on what jets to put in (currently stock jets are in)??
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Old 11-07-2010, 09:26 AM   #8
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U gotta run an air filter for correct operation and so you don't suck any crap in and destroy the engine. The baffle missing will also make it run like crap, unless you re-jet. You probably need the baffle installed seeing that you live in Cali.
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Old 11-08-2010, 05:35 PM   #9
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baffle removed=lean , air filter out= lean , plug is sooty=rich????? choke having no effect most likely is stuck in on position, enriching fuel mix.

they will run just fine with the baffle out, but lean.
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Old 11-09-2010, 01:25 PM   #10
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I removed the choke and cleaned the hell out of it, all seals look pretty good. But still not effect when I open and close it.


I did notice the "boot" (small black condom looking thing) on the fuel accelerator pump is torn and stretched out.
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Old 11-10-2010, 06:27 AM   #11
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The boot just keeps the dirt out and should be replaced, but doesn't effect performance. Check the intake manifold for cracks and make sure its screws are tight. The choke plunger should have a drastic effect if working correctly on a clean carb.. Are you sure you have slack in the throttle cable, and its not holding open??
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Old 11-11-2010, 03:04 PM   #12
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Yah the throttle cable is fine.
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Old 11-11-2010, 03:06 PM   #13
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Quote: Originally Posted by 366warrior View Post
baffle removed=lean , air filter out= lean , plug is sooty=rich????? choke having no effect most likely is stuck in on position, enriching fuel mix.

they will run just fine with the baffle out, but lean.

Is there a way to determine if the choke is stuck in on the position?
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