Please help me diagnose

Marktur

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Hi all,
OK, the motor idles fine, but a bit slow on acceleration (getting on the pipe), and at WOT or cruising speed, I feel a bit of hesitation...as if I'm not feeding it enough gas.

I have not pulled out my plug to look at it - it's still warm from riding, but it's a new NGK plug as recommended.

I have the carb set (e-clip) to the lowest (closest to the bottom) because they say that's the setting for my zone in the world...but I'm starting to wonder.

At idle+ is jerky - I don't know if this is normal or not, but I can't just let it idle around...it wants to go. At mid-range, and say 15mph it starts to really wake up, and I don't feel this at half throttle.

I know I still need to check the ports and gaskets, but I've also seen conversation stating that this has to do with the neeedle in the first place, or the diameter of the jets -- which is just beyond my level of knowledge...but not afraid to follow directions. :)

Thanks for your help, and ask away so you can help me figure this one out.
Mark
 

srdavo

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with your clip set at the lowest setting....you might be pushing too much fuel in at WOT.
try moving your e-clip one setting. (test drive)
then move it one more setting....try that.
then pick what's best....and tell us about it!!;)

didn't you just change to a 40t sprocket? remember...you always lose some on the bottom end, when you gain on top end. that's prolly why your seeing the jerky/chugging-lugging at low speeds. (you are right in saying "it wants to go")

IMO, don't alter your jet or needle. and don't worry much about porting.
just be "happy" everytime your "happytime" starts & runs!!
(see my signature.....lol)
 

Marktur

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Hi Dave,
No, I think this has been around since day 1. It's just that with the new sprocket, I can finally open it up without the shakes and sounds (over revving), and I thought it would go away if I could run wide open (thinking maybe vibrations were the cause, since I wouldn't turn it all the way open - I was blaming it on myself).

I thought the lowest setting on the needle was for a leaner mix? Moving it up one makes it richer...I'll try it in the AM before my ride to work, let you know. That brings it back to stock, right?

For the porting, I just want to see how much is being blocked...if it's significant, I can improve it.

Approx. how fast should I be going on flat ground, 220lbs, WOT? I think it will top out at 30 in enough time. Not that I want to go faster, I just want to make sure my motor is the most efficient.

And on a really good note: My last month gas bill was $198...probably half of the month before! I can't wait to see the bill in July!!!! Sticking it to the man!
 
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I thought the lowest setting on the needle was for a leaner mix? Moving it up one makes it richer...I'll try it in the AM before my ride to work, let you know. That brings it back to stock, right?
QUOTE]

Just the opposite Mark. The higher the clip, the lower the needle = leaner.
The lower the clip, the higher the needle = richer, needle position restricts fuel flow from the bowl up thru the tube that the needle "rides" in and into the intake...
 

Marktur

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Whoops - according to Dave's first link, I'm running as LEAN as possible - clip is closest to the END of the needle. I'm going to move it one notch at a time...I'll move it back to the stock/break in position (second down from the end) and ride it today...if I see a good improvement, I"ll move it one more and see if it gets better...one change at a time. :)
 

Marktur

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OK, so I went to the SECOND notch from the end from the first notch closest to the end.
My top end smoothed out, especially while decelerating. I didn't feel the need to pull in the clutch every time I left off the gas.

But the bottom end got fat (rich). Idle got a lot slower - I have the screw turned in just about all the way now. (Is that right?) Slower acceleration, and at mid range switching between 2-stroking and 4-stroking. I think my top end is a bit less, too...

I know everything is a trade off...but man, I wish I had another rider close by to have something to compare it to. :(

So I think the next step is to pull out the manifold and muffler, and make sure I don't have **** in there blocking things, etc. I also thought that I can pick up another stock muffler and experiment with cutting the manifold and making it longer using rubber hose (like we do with tuned pipes on RC airplanes/cars) to see if I can get the motor to "stay on the pipe" in a much wider throttle range.

Am I chasing my tail here?

Again, not looking for speed, but efficiency and smoothness.

Also - do you recommend that I change out the spark plug wire?

What else can we do to make the motors run their best?

(Please don't think I'm unhappy or complaining - I'm a software guy, and I don't get to tinker with my hands as much as some of you - so it's actually enjoyable as a hobby for me.)

Thanks! :)
Mark


So...
 

Marktur

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I would love to show my plug but unfortunately, the sky is falling...so I had my wife pick me up and I put the bike upstairs in the office. It's going to smell like gas in the AM, and my partner is going to ***** like a little girl....and I'll walk around with a smile on my face all day!
 
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