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Post by headcoats on Sept 8, 2017 18:35:40 GMT 1
Had my PWKs for years now and they still annoy the hell out of me LOL
I have always kept the same main jet (152) with Ramairs but always had to feck about with the pilots Tried 40's to 48's then settled on 45's then dropped to 42's but plugs were never burning clean around this size I had the airscrew 2 turns out on the 42's Today I fitted 40's and airscrew 1 turn out and it seems to run good and at last the plugs were not wet , but not gone for a spirited ride yet
Dilemma is I run premix and had larger pilots for the shut throttle moments , hoping the rich jetting would keep things oiled
Probably having a senior moment but do these PWKs ever run right !
Or are piots just not as important as the needles and main jets ? |
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Post by rigga on Sept 8, 2017 20:41:35 GMT 1
Pilots are probably more important on PWK's as they have an affect on the whole throttle range unlike those on standard carbs, can't help much further than that as your set up with no airbox and premix has more variables than normal
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Post by midlifecrisisrd on Sept 8, 2017 21:46:34 GMT 1
And you laughed at me using 36's with a drilled airbox
Steve
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Post by headcoats on Sept 9, 2017 7:57:49 GMT 1
Don't think I laughed , just was shocked !
38's go in the KR1S 250 but when I bought my PWK 28 from Kawasaki , they were for a KX85 and they came with 45 pilots !
Look on the Banshee forums and they are heading towards 50's , just all over the place
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Post by midlifecrisisrd on Sept 9, 2017 9:16:59 GMT 1
Ah but the banshee/LC and ypvs are different beasts
The ypvs seems to like a smaller pilot and larger main.
Maybe something to do with the pv's and it being more efficient at lower revs
From memory mine is on 36 but still slightly rich at small openings as it machine guns a bit on neutral throttle and has dyno'd as slightly rich up top so I do have a set of 34's to try if it actually comes out the shed
Steve
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Post by rigga on Sept 9, 2017 13:59:09 GMT 1
Its right about the different requirements between lc and powervalves regarding pilots, my lc is currently on 50's
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Post by wallcraft on Sept 9, 2017 16:21:47 GMT 1
rigga, is your motor standard, what needle and mains are you using?
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Post by rigga on Sept 9, 2017 20:09:15 GMT 1
Standard porting as far as I know, 2mm over, Gibson pipes drilled airbox lid 122 mains jjh needles 50 pilot's
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Post by Mr Kipling on Sept 9, 2017 21:25:39 GMT 1
I ran 38,s in mine on my pv , bought 36,s to try as small hesitation before coming on song if accelerating slowly I ran drilled airbox , ran perfect on pod filters n bigger mains though..
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Post by LC_BOTT on Sept 9, 2017 21:52:36 GMT 1
sort of on topic, but are you supposed to oil the Ramair pod filters or just leave as is, and wash when they get dirty?
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Post by wallcraft on Sept 9, 2017 22:29:49 GMT 1
sort of on topic, but are you supposed to oil the Ramair pod filters or just leave as is, and wash when they get dirty? Always ran mine dry for a good few years then went back to the box. |
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Post by wallcraft on Sept 9, 2017 22:38:34 GMT 1
Standard porting as far as I know, 2mm over, Gibson pipes drilled airbox lid 122 mains jjh needles 50 pilot's 4lo, Tsa's, n99e needles, 125 mains, 52 pilots , lid on. Usual 5k flat spot I'm trying to sort. I think I'll try the jjh needles again and fiddle. Are the jjh needles leaner than the n99's? |
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Post by midlifecrisisrd on Sept 9, 2017 23:06:05 GMT 1
Standard porting as far as I know, 2mm over, Gibson pipes drilled airbox lid 122 mains jjh needles 50 pilot's 4lo, Tsa's, n99e needles, 125 mains, 52 pilots , lid on. Usual 5k flat spot I'm trying to sort. I think I'll try the jjh needles again and fiddle. Are the jjh needles leaner than the n99's? What slides do you have? 3.5 or 4 Thought you only used the 99 needles on no4 slides If 3.5 I though it was n68 needles on an LC Steve |
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Post by rigga on Sept 9, 2017 23:20:43 GMT 1
Thought n68 needles were unobtainable and jjh were a good alternative, and were recommended for 3.5 slides?, I know I tried to obtain some n68's a while back and couldn't get any, kr1s fitment I believe.
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Post by wallcraft on Sept 9, 2017 23:50:22 GMT 1
Slides are 4's, yep your right 3.5 for 68's.
Any idea which order are the leanest through to the richer out of the 3 needles mentioned?
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Post by midlifecrisisrd on Sept 9, 2017 23:57:11 GMT 1
Afraid I have no idea
Steve
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Post by midlifecrisisrd on Sept 10, 2017 0:00:33 GMT 1
There must be quite a difference in jjh and n68 as I always thought jjh for airbox and n68 for no airbox
Not sure if I still have a pair of n68's to check
Steve
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Post by headcoats on Sept 10, 2017 0:25:13 GMT 1
Just shot off loads of emails to various bods asking about the availability of the fabled N68 needles
I have some but probably part worn by now
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Post by wallcraft on Sept 10, 2017 9:09:42 GMT 1
I'm sure Allens got some n68s in on back order for me a few years ago when I was running Ram airs. The set up for them was pretty much the same as headcoats but 50 pilots but the 99 and 68 seemed pretty much the same on the road, either way that jetting was safe for balls out thrashing, just that god dam glitch. Now started the whole fettling process again using the original box!!
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Post by bare on Sept 11, 2017 1:08:39 GMT 1
Having Issues with PWKS..really ?
Then your carbs are worn out, broken, or somehow seriously messed.
PWKS (healthy OR new) are pretty well fool proof and Run Perfectly on "close enough' jettings... far more jettings friendly than Mukinis.
THAT is the major reason for fitting the rascals.
Dunno about Ram Air filters tho.
My pwks run absolutely Perfectly on JJH, 40's and 130's albeit a bit rich (by intention) OEM LC airbox with a Higher flow filter media.
Yvps lump though. With pretty well all the street usable mods done.
Suggest revisiting either the condition of your Carbs or the setup in general.
Something is clearly wrong.
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Post by wallcraft on Sept 11, 2017 7:41:58 GMT 1
Thanks Bare, apart from the slides wearing what else wears out if all the jets, emulsion tubes and needles are fresh?
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Post by muttsnuts on Sept 12, 2017 17:27:46 GMT 1
the body of the carb can wear where the slide moves up and down, if it wears too much it allows more air past than it should, other parts are the needle jet top hat (forgotten the name of it now), but that goes in before the needle jet, also Keihen recommend changing the needle jets more than needles to correct fuelling issues, but I've managed to get most bikes running fine with just needle, main and pilot jet changes
HTH
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Post by headcoats on Sept 12, 2017 18:19:25 GMT 1
Another thing is the needle jets and how they come in different heights
I have 3 different heights for these carbs, with the tallest ones coming with the KX85 carbs
No idea what they do but I fitted the shortest ones , as in less intrusion into the carb mouth
Asked about this ages a go and was told something to do with the signal strength ?
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Post by wallcraft on Sept 12, 2017 22:35:37 GMT 1
Thanks gents, may try replacement needle jets next.
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Post by paulincayman on Sept 13, 2017 15:36:54 GMT 1
sort of on topic, but are you supposed to oil the Ramair pod filters or just leave as is, and wash when they get dirty? Always ran mine dry for a good few years then went back to the box. Have always oiled any foam filter..... catches all the fine particles .,backed up by my KTM service manual , can use just about any lightish oil , I use ATF, saturate and squeeze out excess. HTH Paul |
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