Author Topic: Jetting!!! Again and again and again!  (Read 288391 times)

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Offline staffylad

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Re: Jetting!!! Again and again and again!
« Reply #405 on: May 05, 2014, 08:08:41 AM »
mynes fouling plugs now,was running fine lastweek at the track ,25:1 mix ,pilot 2turns out ,changed gas put fresh mix in today fouled 2 plugs ,gonna turn screw out 1 n half turns see wat happens.

Offline Twosmokerfan

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Re: Jetting!!! Again and again and again!
« Reply #406 on: May 07, 2014, 05:23:14 PM »
Hi everyone,

After playing with my 500 for the last year or so, I bit the bullet and bought a pwk39 as nothing I did to the carb on the bike when I bought it made it run well.  I am putting the down to worn internals an the emulsion tube (or needle jet, depending on terminology).

Since then, it is jetted nicely now for idle (45p, n82m on the top clip and num7 slide, with a 165 main. I ride in hotter climates and only really up to 1000m)

I can't seem to lean out the mid range any more as the plug is always black and I went and got my hands on a n82n and p needles. The question I have is "Is the n needle on the bottom clip leaner than the m needle on the top clip. And is it the same for the p compared to the n".

I know when you play with other needles like cem vs a dem needle, it leans off the first part of the throttle opening, but I was hoping someone could tell me about the n82 series.

TSF

Offline Twosmokerfan

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Re: Jetting!!! Again and again and again!
« Reply #407 on: May 09, 2014, 08:38:46 PM »
Anybody????

Offline reklessj

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Re: Jetting!!! Again and again and again!
« Reply #408 on: May 10, 2014, 02:01:03 AM »
The lower the clip position the richen you get. As far as the p and n go, you'll have to wait for someone else to chime in
My rides: 1994 KX500, 1988 T4, 1998, ZXI 1100 JETSKI, 2003 MOUNTAIN CAT 900
WIFES (Baby Fiver) rides: 2004 KTM 105SX,1992 LT250R, 1995 ZXI 900 JETSKI,  2011 RMK 600
SONS ride: 1995 YZ125,2002 RM 250
other rides: 2007 RMZ450 RC Ediition, 2003 RMK700

Offline Foxx4Beaver

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Re: Jetting!!! Again and again and again!
« Reply #409 on: May 10, 2014, 02:05:42 AM »
P is leaner than the N...I run a T.
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ

Offline sandblaster

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Re: Jetting!!! Again and again and again!
« Reply #410 on: May 10, 2014, 03:46:16 AM »


The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline ylwgtr

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Re: Jetting!!! Again and again and again!
« Reply #411 on: May 28, 2014, 11:30:22 AM »
he wants to know the comparsion between the n and m needle in respect to full lean on one and full rich on the other.....my advice would be to map both needles....you can work it out that way

Offline Twosmokerfan

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Re: Jetting!!! Again and again and again!
« Reply #412 on: June 22, 2014, 09:48:50 PM »
Yes ylwgtr, that is the answer i am looking for.

Well, I tried the N82n on the bottom clip (a short video link on the video post) and it worked well. Better than the m needle. Ran cleaner and pulled clean from down low. Tried it then on the middle clip (leaning it off) and I felt it might have been too lean. Went second clip from the bottom. I have concluded that the n is leaner than the m and the bike is running very nicely now. It idles no problems and doesn't load up in the slow stuff. Only a slight puff of smoke when cracked from idle and the throttle then closed. I am more than happy now.

Final settings at this stage:
P 48
Screw 1.5 out
Needle n82n on second clip from bottom
Main 165.

TSF

Offline stujordan

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Re: Jetting!!! Again and again and again!
« Reply #413 on: August 03, 2014, 11:53:06 AM »
For the hardcore...

52 pilot 2.5 turns
150 main
N82R needle in 1st position (leanest)
320 ft above sea level

...not that im advising anyone to do this...

My pig will get along...my life has flashed before my eyes soooo many times ;)
« Last Edit: August 10, 2014, 11:24:32 AM by stujordan »

Offline Foxx4Beaver

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Re: Jetting!!! Again and again and again!
« Reply #414 on: August 03, 2014, 12:03:04 PM »
holy boiler maker :-o...how much WOT runs are you doing with those settings?...with what carb, and type of fuel and pre-mix ?
« Last Edit: August 03, 2014, 12:10:27 PM 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 #415 on: August 03, 2014, 12:15:51 PM »
Stock pwk 39 carb and 7 slide
90 octane free of ethanol
32:1 supertech (cheap walmart brand)
Both air box vents open
Stock porting and squish....

I never hesitate WOT, but dont need it to smoke a 4-pump-chump (friends with 4-strokers)  :evil:
« Last Edit: August 10, 2014, 11:22:35 AM by stujordan »

Offline Foxx4Beaver

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Re: Jetting!!! Again and again and again!
« Reply #416 on: August 03, 2014, 12:30:38 PM »
have ya done any plug chops with those settings...I would have to think the plug would look "brand new" white, from being so lean...but, I've never gone that lean before either, so I could be wrong.
no pinging with those settings?
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 #417 on: August 03, 2014, 12:45:26 PM »
If it pings its not noticeable...the plug is actually brownish black, but I dont hit WOT in every gear...

I see people reasoning going lean on the pilot and rich on the main is the ticket...think they should talk to desert racers for the best advice....bought mine from such a person.  It has over 20 hours since I bought it from the dude...
« Last Edit: August 08, 2014, 05:03:06 AM by stujordan »

Offline stujordan

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Re: Jetting!!! Again and again and again!
« Reply #418 on: August 08, 2014, 05:04:59 AM »
Just read a post on another site that runs a 148 and a 48....might need to try that with a N82T needle...as is im a little rich....

Thoughts?

Offline Foxx4Beaver

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Re: Jetting!!! Again and again and again!
« Reply #419 on: August 08, 2014, 07:33:40 AM »
I wouldn't, but I ride in the upper revs for the most part...
when was the last time you did a compression check...or rebuilt the top-end?
Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ