low rpm stumble

[jake42]

So this has been kinda buggin me since I rejetted a month or so ago.

Here's the info.  
V&H full system
K&N pod filter
150 mains, 40 pilots, 2 #4 washers on needle. 3 turns out.

The bike runs great but I've noticed that if I am sitting at a light just idling for  awhile and then blip the throttle it hesitates a little and the rpm's stumble. I've also noticed that at very low rpms 2 grand or so the bike seems to hesitate a little bit.  Once I hit 3500-4k or so it pulls great.  Just wondering if anyone out there is having similar issues after rejetting and modding.  

It's not the end of the world, but it is a little annoying

Jake

[The Buddha]

No we aren't having the second problem... why... no one is dumb enough to try to load the thing at 2K... You nuts boy... 2K this thing wont pull hard enough to be able to drag a fly on the ground... Just kidding... 2K is not a loadable rpm... 1/2 clutch at 2K...
OK that traffic light thing... I understand and there is probable cause... float may be a bit too high. If your idle is satisfactory the float should be lowered just a mm or so... if your idle isn't... and its revving much higher when hot, than when cold... then you have to richen it up a little, then see if the problem is worse or better (should be worse) and then lower float level 1 mm. Lowering it 1mm may result in having to richen up the mix screw... but dont touch float level till you set the mic screw right. No sense doing the harder work first... then you might have to do it twice.
Cool.
Srinath.

[Ed_in_Az]

Just for curiosity, did the pipes, air filter, and jets make quite a difference in horsepower?

[The Buddha]

OK Jake at 2K how are you doing the throttle test... Letting the clutch out at 2K when you are rolling... you usually tend to let it out faster than the first part where you try to get it rolling... that quick let out makes the load on the motor go up very very quick and causes it to stumble and hesitate... However if you aren't using the clutch... you are in first gear and rolling along at 2K (will it even roll at 2K wihtout clutch) and you open up... and hesitating then... OK that is presumably float level... however can you fix it wihtout upsetting somehting else... You can only if the float was set high to start with... or the 2 carbs are slightly off... I suggest you check both with U tube method and set the 2 equal to the one that is lower as it sits in U tube.
Cool.
Srinath.

[jake42]

Srinath,

I knew you'd come through.  I was thinking float level because of the hesitation  when it's at idle.  The bike idles fine when hot, right where it should be.  I only notice it, if i let it idle then blip the throttle like i mentioned. It never acts starved or anything on idle.  

As for the 2K thing, I felt like an idiot after writing that and before you even replied cuz you're exactly right.  On my way to work today I was thiking about it and decided 'what the hell' i don't do anything under 4k anyways.  

Jake

[The Buddha]

OK in theory you should be able to get it rolling in first gear and after commign up to the speed where you can let off the clutch fully... you can shut throttle till rpm drops to 2K... make sure road is leve and there is no headwinds... cos I believe else it cant actually reach 2K wihtout jerking and stalling and then open the throttle to check... OK if it bogs or falls on its face... whne opening fast... float set too high, if it seems like its running out of gas... float is too low, if its feeling like its sucking air and not really accelerating... and its making a gasping sound... try opening throttle slower... if that works better... then its slide rising too quick. I was trying to do this a long time ago... it had to be dusted off and remembered. But a stumble on opening throttle almost always = rich... You might just be slightly rich in that 1 spot... fixing it might mean many hours of fiddling with stuff... Just leave it be if you dont want to open up the thing many times. But anyway make sure floats are set equal... if not set them to lower one. That should take care of it as a side efect.
Cool.
Srinath.

[jake42]

so srinath here's what I did today.  I was still aggravated with the stumbling and hesitation at low rpm's so I pulled the plugs  to see what was up.  they plugs were nice and tan. I thought they'd be black and loading up.  My neighbor (long time biker/gearhead) suggested I clean the contacts anyway and see what happened.  So i gave them a quick buff with the lightest sandpaper I had and stuck them back in.  No more stumbles or hesitation. What's up with that?

Jake

[jake42]

So I've been noticing after a hundred or miles or so after my rejet and mods that the bike is hesitating and stumbling down low.  I pulled the plugs yesterday to have a look, thinking they'd be black from being too rich.  The threads were kinda black, but the contacts were a nice tan, just like they should be.  My neighbor suggested I clean the contacts anyways  and see if that made a difference.  Well a quick buff with super light sandpaper and no more hesitaion down low.  I"m just a little confused.  They're not  black and gunked like they were loaded from the bike being too rich, but the quick clean sure made the problems go away.  

Any suggestions.

jake