Joo, noi on kawan numeroita, ja Saksasta tilasin omani. CMSNL' ltä saanee myös.
Toi neula on hieman erilainen kuin Dynojetin neula, taitaa olla kartiompi. Riippuen sitten hengitysmuutoksista, kato että saat oikeen kokoset pääsuuttimet, jos DJ-sarjan hommaat.
Tuli hiukkasen lisää tietoo tosta säätämisestä, joten jos kerrot mitä on tehty, osannen kertoa mitä pitää tehdä, jotta saa säädöt kohdalleen.
Tai no, lue tosta:
That's what I thought. You were the second person after me to go to the trouble of quantifying results via the dyno and because your findings mirrored my own...Different bike, different Continent, different rider, different dyno...Same results...together we established that jet sizes were constant for given mods and so it would be possibly to write a 'better than ballpark' guide for future fiddlers!
your voyage of discovery also helped me to come to the conclusion that Gino was in effect correct in that the various mods actually don't help if the bike's mixture is already correct, but of course he and I didn't know that the bike's mixture above 6000 rpm was actually and intentionally INcorrect thus prompting the early experiments.
For all future stock bike searchers of that 'hidden' 7 (ish) bhp above 6000 rpm...You only need to REDUCE main jet size from the stock 118's to 112's to get it. you would also improve the mid by fitting a better needle...So basically, buy the FP or indeed the dynojet kit which includes jets and needles and you're there without scary airbox surgery or visits to the dyno guy!
For all you baffle punchers out there. Your efforts will improve top end by matching your better flowing pipes to the existing jets, but again, the needle will be wrong giving a flat spot from 4800 to 6000 so you'll have to live with the now pronounced 'cammy' effect as the bike goes lean at 4800 ish and then gets better at 6000...giving a sort of power step...Or fit the better needles. Same goes for those who simply fit Posh pipes or whatever...The main jets will now be correct but the stock needles won't be....And shims aren't good enough as the needle does not have anywhere near enough taper for that small lift-up to make much difference.
Lisää, selittävä osio:
When you say 'with airholes' what sort of airholes. . Having done extensive testing, my (and Pete Cordells) findings were that with four airholes under the media, and my own open pipes which cannot have been all that much 'better' than the 'Posh' pipes...the main jets were correct after being on a Dyno at size 145. To give some idea of how rubbish the stock needles are, the bike performed best at around 4500 to 5500 with a 155 main jet..
Much of the noise we hear from a bike can be induction noise so the volume of sound of the bike is not indicative of tuning. My bike was also very loud with holes in the airbox...Primarily because exhaust sound emanates from behind the rider into the slipstream while induction noise emanates from below one's legs and can be more easily heard.
A 125 main jet is about right for a bike with a 'shelfectomy but NO other airbox 'tuning, and open pipes...Maybe 1 size down from optimum.
To reiterate....Stock bike...Optimum main jet for power is a 112 (and decent needles)
Stock bike with free flowing pipes...118's (the stock jets) or 120's
Shelfectomy with stock pipes 123's (decent needles to correct mid band)
Shelfectomy with open pipes 128's (decent needles to correct mid band)
Shelfectomy and two holes , open pipes 135's (decent needles to correct mid band)
Shelfectomy and four holes open pipes 142-145's (decent needles to correct mid band)
Without decent needles, all this figures go to pot because as airbox tuning gets more radical, the main jet needs to be made progressively greater in size than it should be to compensate for the needles which artificially limit fuel for the reasons of noise discussed before.
Remember...The golden Rule with CV carb tuning. Work out at what REVS the needles fully clear the main jet...For our W's that is at 6000 rpm. Then find the correct main jet for optimum running ABOVE 6000 rpm
Only then can you tweak the 0 to 6000 range...Where the needle controls the mixture, by adjusting and/or changing needles.
Also remember that a CV will run with radically different main jets. With four holes in my airbox, stock needles and my open pipes my bike ran without miss-fires with 128's all the way up to 155's and the main 'arse dyno' difference was in the upper mid range. The correct jet size was 142.
My 'arse dyno plus experience setting was 145's but with stock needles the bike's midrange was much better with 155's in....With all jets the bike seemed to go well apart from the 155's which felt a little 'woolly' above 6500 rpm.
The carb was self correcting and removing the 'feedback' one could have used to adjust settings.
The correct setting was simple for me...Fill in the airbox holes (except the shelf-ectomy which is irreversible) , fit the correct main jet as determined by a dyno... 128's... and then tune the midrange via the needle so that the bike ran strongly from 4800 up to and past 6000 ...In top gear.
If it doesn't rev through that area smartly and strongly with the correct main jet, the needle is either stock, or if a new needle, it's at the wrong height.
This is not Rocket Science!
So...How do you get it right?
Simple...do what ever buggering about you feel you have to do to the airbox (but remember the end improvement in power terms is precisely zero). Do what ever you want to the exhausts. THEN take the bike to a dyno shop and find the correct main jets by running above 6000 rpm.
Now work towards getting your bike to rev hard from 4800 to past 6000 (i.e. 'through' the transition between 'needles and main jets' to 'main jets only') by initially shimming your stock needles, discovering that doesn't work, and then buying FP or KLR ones
Once that bit is right, all the rest will be OK apart from idle where you simply adjust the idle MIXTURE screws to 'peak out' the revs there...And it'll go like mine does...
Jos se kotimainen pannukakkufilsuilla varustettu oli hopeenvärisellä tankilla ja 2-1 putkella, se on mun.
Mulla oli ensin halpis pannukakut, ja pyörä tuntu käyvän hyvin 140 pääsuuttimella. Neula keskimmäisessä urassa. Sitten halpiksesta repes kumikiinnike ja laitoin paikoilleen K&N't jotka on about 2 kertaa niin paksut kuin noi halpikset. (virtaa paremmin)
K&N'llä huomasin motarilla ajaessa fillarin menevän laihalle jollain nopeuksilla, riippuen jalkojen asennosta. En kerennyt/laiskuuttani sitten saanut nostettua neulaa.
Nyt heitän halpikset takasin, ja katon mikä tilanne ton ohuelle menemisen kanssa, ja säädän neulaa sen mukaan ja/tai laitan isompaa suutinta. (noi puoli kesää ajetut K&N't voisin myydäkkin)
Tota englanninkielistä tekstiä kun tavaa, toteaa, ettei pannukakut tuo muuta lisäarvoa kuin komean ulkonäön. Onhan sekin kyllä jotain. Ja saa säätää kaasaria.....
Jack