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Author Topic: KX500 AF Running like a 200  (Read 26687 times)

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Offline motopunk

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Re: KX500 AF Running like a 200
« Reply #60 on: May 26, 2013, 04:56:36 PM »
sounds great ... i´m excited to see the bike with the right exhaust on it...  :-D
« Last Edit: May 26, 2013, 08:35:51 PM by motopunk »
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big 2 stroke bikes are weapons for real men, who don´t fear death or devil. ;O)
´83 kx250, ´87 kx250 (with 360 big bore), 87 kx500, ´93 kx500 sfc

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Offline RKPerformance

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Re: KX500 AF Running like a 200
« Reply #61 on: May 26, 2013, 11:32:50 PM »
Yep im at sea level.  52 pilot jet in there, #2 position on the stock needle, and a 165 main is what i have running now.  The carb is a bored pwk 40.5mm.
So you think bump the pilot to 58 and main to 168 then lower needle to #3?  It doesnt seem lean at all right now, maybe just on the pilot, but if you think i should give it a pull i will.
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Offline Foxx4Beaver

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Re: KX500 AF Running like a 200
« Reply #62 on: May 26, 2013, 11:48:21 PM »
just my 2 cents...I'm at 250'-500' above sea level here in south-east Massachusetts,and I run

    168 main
    52 pilot
    2nd from top(stock needle)
    2 turns out on air

...now I do alot of trail riding,reason why I'm a touch on the "leaner side"...with the occasional WOT down a power line/sand pit,and it pulls hard at all times,never have a problem with the front wheel lifting in any gear...and it runs super crisp and clean.
I also run 25% C12 in my fuel.
I'm no "guru" by any means...and I know every bike has it's own characteristics/personality...but I'm thinking jetting is not your issue...since we're so close to elevation. 
« Last Edit: May 26, 2013, 11:57:46 PM by Foxx4Beaver »
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Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline RKPerformance

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Re: KX500 AF Running like a 200
« Reply #63 on: May 27, 2013, 01:02:20 AM »
foxxx I figured out why it ran like butt, it was the previous owner who had a yz250 pipe and 250 silencer on the bike that made it run like dog s**t.  Now im just wanting to make sure my jetting is on the numbers.  Im not sure where to be at with the bored 40.5 carb.  I know what it should be with a stock carb.  Plug seems good with the 165 main and i was doing alot of gravelroad riding WOT.  Probably wouldnt hurt to jump it up to a 168 and see if it  pulls better??
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Offline motopunk

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Re: KX500 AF Running like a 200
« Reply #64 on: May 27, 2013, 05:23:13 AM »
look here in sandblasters kx500-jetting guide . its always a great help  8-)

www.oem-cycle.com
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big 2 stroke bikes are weapons for real men, who don´t fear death or devil. ;O)
´83 kx250, ´87 kx250 (with 360 big bore), 87 kx500, ´93 kx500 sfc

---  www.der-motopunk.de.tl  ---

Offline RKPerformance

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Re: KX500 AF Running like a 200
« Reply #65 on: May 27, 2013, 08:04:48 AM »
Does the bored carb change the jet size i would need compared to that chart?  I ran the bike side by side today wit a cr5.  The cr5 deff got more balls.  The CR just seemed to have way more snap and could pull the front end with ease compared to the KX5.  Seems like i got quite a bit of gass drippin out the bowl overflow.  If im in a higher gear and lug it she doesnt seem to have near the torque the CR does in picking up power.
« Last Edit: May 27, 2013, 08:53:38 AM by RKPerformance »
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Offline motopunk

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Re: KX500 AF Running like a 200
« Reply #66 on: May 27, 2013, 09:01:48 AM »
the jetting guide is a good base ... fine jetting only with looking the color of the sparkplug and short testrides . never on an cold engine...
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big 2 stroke bikes are weapons for real men, who don´t fear death or devil. ;O)
´83 kx250, ´87 kx250 (with 360 big bore), 87 kx500, ´93 kx500 sfc

---  www.der-motopunk.de.tl  ---

Offline RKPerformance

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Re: KX500 AF Running like a 200
« Reply #67 on: May 27, 2013, 09:34:45 AM »
Bike pics
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Offline RKPerformance

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Re: KX500 AF Running like a 200
« Reply #68 on: May 27, 2013, 12:12:23 PM »
Just checked the plug and she is black.  Quite a bit of carbon crap built up around the bottom of the plug (not the electrode part)  Running a br8eix iridium plug.  Think it is safe to try a 162?  That was what was i there with the 250 pipe on it and it ran the best with that jet.  Obviously things have changed now, but it sure seems like the plug is black and crappy looking.  Carb says PWK V820GG07
« Last Edit: May 27, 2013, 01:43:23 PM by RKPerformance »
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Motorrad

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Re: KX500 AF Running like a 200
« Reply #69 on: May 27, 2013, 03:08:31 PM »
Always set float hight before jetting...

Do that.  The correct external way...


Then go look at the jetting I recommended on page 4 of this thread
« Last Edit: May 27, 2013, 03:10:18 PM by Motorrad »
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Offline RKPerformance

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Re: KX500 AF Running like a 200
« Reply #70 on: May 28, 2013, 01:52:21 PM »
Float height is good.  Put in a 168M, 55Pilot and moved the needle to the #3 slot on the stock needle.  1.5turns on air screw. Temp is about 55 out.  Bike seemed to pull wheelies easier in 1-2-3.  Roll on power was not fully there and it just seemed a little more burbly.  I think the #2 position on needle will work alot better.  I also think the bigger main helped, deff seemed to have more grunt once it wound up.  Bike idled better with the 55 pilot.  Think i found another issue tho, my throttle cable seems to be binding because when i turn the bars full right the bike revvs up due to the cable stretching. Overall tho i would say it improved power over the last setting I ad, but by no means is it dialed :|
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Offline RKPerformance

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Re: KX500 AF Running like a 200
« Reply #71 on: June 05, 2013, 02:46:50 PM »
Is 150 psi compression good on a cold motor?  Thats wat I got, not sure if this is why it seems down on power compared to my cr???
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