Author Topic: Jetting!!! Again and again and again!  (Read 287994 times)

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Offline stujordan

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Re: Jetting!!! Again and again and again!
« Reply #420 on: August 08, 2014, 07:39:11 AM »
Would either cause me to run rich?

Offline Foxx4Beaver

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Re: Jetting!!! Again and again and again!
« Reply #421 on: August 08, 2014, 07:50:32 AM »
for you to be running as lean of settings as you currently are, and saying your plug is "brownish black"...hints towards a weak top-end.
it doesn't necessarily mean it's weak, but yeah, it would cause you to have rich running symptoms.
the usable range for compression in the book is 105-164psi...for a stock motor.

It wouldn't hurt to check it...then you can rule it out, or if it is weak, you can freshin it up, cause there'd really be no reason tryin to jet a weak top-end, you'd just be going backwards.
not to mention, the leaner you go, the more stress you're putting on the motor...which only accelerates the wear.
« Last Edit: August 08, 2014, 08:09:01 AM by Foxx4Beaver »
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline stujordan

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Re: Jetting!!! Again and again and again!
« Reply #422 on: August 08, 2014, 10:06:38 AM »
When I get home sunday ill post a pic of my spark plug....might be giving u the wrong color....

Offline stujordan

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Re: Jetting!!! Again and again and again!
« Reply #423 on: August 10, 2014, 11:08:01 PM »
Just noticed my bike doesnt surge anymore....recently moved to an altitude of 320 feet from 1800.

Smokes a good deal at startup...but smoke goes away a little when motor heats up.

Also it idles just fine hot or cold...not like before.

Anyone else running a n82r needle? What clip position and altitude?

The mid and top feel flatter than before too....use to hit like a freight train....now it feels mild.  

Just replaced the air filter with a UNI....soaked it with 10w40 and squeezed out the excess with my monkey fists....still too much oil?

Setup:
FMF Fatty
52 pilot 2.5 turns
150 main
N82R needle in 1st position
Uni air filter with maybe too much oil
Both vents open
32:1 non-ethanol 90 octane (clear gas)

Ideas?
« Last Edit: August 11, 2014, 12:04:07 AM by stujordan »

Offline motopunk

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Re: Jetting!!! Again and again and again!
« Reply #424 on: August 11, 2014, 12:10:11 AM »
http://oem-cycle.com/KX500JETTINGGUIDE.shtml

thats a good jetting base...

 why you dont use airfilter oil??  :? .. you need no much oil . turn the airfilter inside out, take carefully enough oil on , and squeeze it a little bit , up to the point that you feel the airfilter has an little bit oily surface. turn back put on the cage and install in the bike... after that it could be that your bike will run leaner, because of the more airflow now...  :wink:
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 stujordan

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Re: Jetting!!! Again and again and again!
« Reply #425 on: August 11, 2014, 06:25:41 AM »
Does turning the air screw all the way in disable the pilot jet effectively?

In other words will the only gas air provided to the engine come from the main and the slide?

Want to test the main and needle only....will that work?

Offline Foxx4Beaver

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Re: Jetting!!! Again and again and again!
« Reply #426 on: August 11, 2014, 08:10:45 AM »
Does turning the air screw all the way in disable the pilot jet effectively?

In other words will the only gas air provided to the engine come from the main and the slide?

Want to test the main and needle only....will that work?

read this thread...more so, the part that Sandblaster has posted...excellent detail.

http://www.kxriders.com/forums/index.php/topic,10910.0.html
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline Foxx4Beaver

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Re: Jetting!!! Again and again and again!
« Reply #427 on: August 11, 2014, 09:36:04 AM »
The mid and top feel flatter than before too....use to hit like a freight train....now it feels mild.  

get that 150 main outa there and swap it for a 168....then report back :wink:
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline stujordan

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Re: Jetting!!! Again and again and again!
« Reply #428 on: August 11, 2014, 10:15:59 AM »
Well....the excess oil drained off the air filter in the last 24 hours....Widow Maker is back to her old self...

In fact she is pulling a tad harder down low than ever before...so much so I cant work up the courage to go WOT :(  the small amount of surging is back, but not horrible...

I saw a video that says when the -fuel screw- (ie...idle screw) is turned all the way in it effectively shuts the pilot jet OFF!  Meaning the pilot jet will contribute zero fuel at all throttle positions....

Has anyone run their bikes with the screw all the way in?
« Last Edit: August 11, 2014, 10:46:04 AM by stujordan »

Offline motopunk

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Re: Jetting!!! Again and again and again!
« Reply #429 on: August 11, 2014, 04:31:47 PM »
Does turning the air screw all the way in disable the pilot jet effectively?

In other words will the only gas air provided to the engine come from the main and the slide?

Want to test the main and needle only....will that work?


this is how a carb works..  pilot jet: from idle to 1/4 throttle turn. needle from 1/4 to 3/4 .. at full open: main jet only .

 any turns on the airscrew effects only the pilot jet. is the screw 2,5 -3 turns out you need the next richer pilot jet. by less than 1 - 0,5 turns the next leaner pilot size.
 
the needle does the main work in performance.. by to rich you have to lowering the needle to get in leaner position.
if the needle has reached the highest clip-position, and engine is still to rich, you need next leaner needle. (example: n82m is in, then comes n82n )
has the needle reached the richest position (lowest clip position) and is still to lean, comes the next richer needle (in this szenario the n82L )... 

by changing main jet never go bigger as 5er steps ... example: 170 is in and to rich you could try the 165 to get leaner or 175 for the other case of to lean.

do always test one of this things to come step by step to the perfect jetting.
 
always with warm engine, and in the conditions,where the bike should used. 
make also sure that the airfilter is clean and oiled in the right way and also that the right gas is in the tank best premix is 1:40 with motul 800. in my eyes the best 2stroke-oil thats available to the public.
 
i ride only 98 or 100 octane (called super-plus here in germany)

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 Foxx4Beaver

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Re: Jetting!!! Again and again and again!
« Reply #430 on: August 11, 2014, 08:49:44 PM »
Does turning the air screw all the way in disable the pilot jet effectively?

In other words will the only gas air provided to the engine come from the main and the slide?

Want to test the main and needle only....will that work?

the simple answer to your question is, no.
everything needs to work together to be effective...or you'll be pissin directly into the wind.
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline Danger4u2

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Re: Jetting!!! Again and again and again!
« Reply #431 on: August 12, 2014, 12:44:23 AM »
the simple answer to your question is, no.
everything needs to work together to be effective...or you'll be pissin directly into the wind.

"That's funny, does that rain feel warm to you???"
KX 500 Rider

Offline motopunk

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Re: Jetting!!! Again and again and again!
« Reply #432 on: August 12, 2014, 02:52:30 AM »
the simple answer to your question is, no.
everything needs to work together to be effective...or you'll be pissin directly into the wind.

"That's funny, does that rain feel warm to you???"

 :lol: :lol: :lol: 8-)
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 Foxx4Beaver

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Re: Jetting!!! Again and again and again!
« Reply #433 on: August 12, 2014, 07:19:16 AM »
the simple answer to your question is, no.
everything needs to work together to be effective...or you'll be pissin directly into the wind.

"That's funny, does that rain feel warm to you???"

hehe...it should...unless he's in the Antarctic!...remember these two guys? :-D


 
« Last Edit: August 12, 2014, 08:29:16 AM by Foxx4Beaver »
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline motopunk

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Re: Jetting!!! Again and again and again!
« Reply #434 on: August 12, 2014, 04:59:36 PM »
the simple answer to your question is, no.
everything needs to work together to be effective...or you'll be pissin directly into the wind.

"That's funny, does that rain feel warm to you???"

hehe...it should...unless he's in the Antarctic!...remember these two guys? :-D


 


in antarctic that means yellow ice cubes in the wind...  8-)
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  ---