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May 31st, 2005, 01:36 AM   #1
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lineweaver jetting kit

we brits had a bank holiday yesterday so iwas out testing dale's jetting kit at last. hell, i've only had it 6-weeks!

dale advocates completely different pilot jetting to me, the MJ is around 0-5 less than me and i'm 10 less than everyone else so we are talking 'sharp, crisp, lively'!

i decided to keep my standard MJ and PJ system and and run just the lineweaver needle. the rest of my pilot area jetting is great with me running just a 35pj and 45paj.

the needle has a lovely smooth pick up, roll on and a light but harder pull at 3/4 throttle for me. it makes the bike feel smooth which i presume means that we never actually have a lean patch as you do with the single taper needles. a clear improvement-at least from half throttle.

i then tried going from my 'spit' of APJ to running without and noticed no difference.

next, i went to dale's PJ figures which are way higher than mine and again there was no difference except that now and again i could 'catch the motor out' and it would die and then go. i used a proper PAJ for the first time in 4 years-shoving in a #100 so i was "dead proper like!"

i had planned to test a race can that i've been loaned and have already had for 3 weeks without fitment. guess that'll also have to wait another 3 as well then!

anyway, i'll race with dale's needle and pilot jetting this next sunday. i won't touch anything else, i'll run it how dale likes it.

i can see exactly how he got the improvements because i studied the needle and of course he, like me, advocates a tiny MJ which takes BALLS to run. the major differences are from 1/2 throttle and that's why the KTM he dyno'd looked so good from halfway.

after getting initially a false feed back from the cam due to being at a MX track, i want to again reserve judgement this time till sunday night.

i won't quote any jetting sizes unless dale chooses to do so. however, in the huge jetting thread started by scully, dale's 400 jetting and mine is there.

it has taken both of us hundreds of hours to get to where we are.

regards

Taffy
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May 31st, 2005, 08:32 AM   #2
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Re: lineweaver jetting kit

Originally Posted by Taffy

my pilot area jetting is great with me running just a 35pj and 45paj.

i then tried going from my 'spit' of APJ to running without and noticed no difference.

next, i went to dale's PJ figures which are way higher than mine and again there was no difference except that now and again i could 'catch the motor out' and it would die and then go. i used a proper PAJ for the first time in 4 years-shoving in a #100 so i was "dead proper like!"

Taffy
Hi Taffy,

The jet kit primary target is that of 501 and larger displacement engines equipped with an FCR 41. Such being said I have often found a #42 PFJ, #100 PAJ and 1.0 - 1.5 turns from seated on the PFS to be better suited to the 400 / 450.

I often rely on an adjustable PAS to fine tune the smaller bikes during transition. (most often set near 1.0 turn which is in the fixed #100 PAJ range)

Hope this helps and thank you for the honest "real world" feedback.

Best Regards,
Dale

PS
In addition the metering rod clip position often needs to be set lower (richer) than on the larger bikes.
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May 31st, 2005, 01:57 PM   #3
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hi dale

definately smoother and better from halfway (still on the needle).

i would prefer to be back on my 35PJ/45PAJ and may go there before the weekend. i found a little spot on the yamaha. at a certain revs in a certain gear i found a little extra! because i'm sure it's nigh on the same i shall possible leave as is or may even go 40/75 w/ 1.5 (or to suit!).

the needle was oddly enough, better on c4 than c3-nice one! the engine always makes a better growl as you know which used to make me say "cooer! it must be faster!". alas i found the truth out a long while ago. it'll want c4 or c5 i'm sure. probably c5 with the 145 would be a good combo.

regards

Taffy
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May 31st, 2005, 09:28 PM   #4
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Hi Json,
HusaSaint indeed.
I am flattered, thank you.

Sincerely,
Dale
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June 1st, 2005, 09:08 PM   #5
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That's pretty neat! Nice that you don't have to be dead to attain sainthood here!!
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September 21st, 2007, 10:35 AM   #6
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i thought i'd resurrect this one for you all and sparks especially!

2/10/05
150>C4>35>45PA>1.75
145>C3.................75
145>C4....................
145>C2....................

8/10/05
.....C3.....................
.......................1.25
.......................1.75
150MJ..................... open silencer
......155MAJ.............

41mm carb
150mj>200maj>...38PJ>3/8 turn>2.5
148mj>C2>35PJ>45PA>2.5
.........C1......................

back to before 41mm
148>155>C3>35>45>2.5
#85 choke fitted
.............C1................
.............................1.5
Belmouth modification
152>..........................
145>.........................

and so there you have it:
Mk1 carb>41mm>Bergoroadracer's belmouth mod and cone airfilter>145MJ>155MAJ>lineaweaver needle on C1>35PJ>45PAJ>1.5 turns of PS>.028"/0.6mm of APJ>#85 choke for racing/first time start (but rich).

four years wrk (but not a single test for 16 months). fatbob read and weep. and you fry!!!!!!

regards

Taffy
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September 21st, 2007, 11:36 PM   #7
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am i too technical for you all?

ho-hum

Taffy
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September 22nd, 2007, 02:25 AM   #8
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Hi Taffy,

I will run it on the DMS set up first then i will retry Dales needle with your settings and let you know how it goes. Thanks again for sharing to all your hard earned settings.

Regards

Sparks.
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September 22nd, 2007, 09:47 AM   #9
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taff, you were always too technical for us.
but i will be trying out some of your info on darrin's 650 w/ the fcr41 this week when i get some new pilot jets. after fixing the pipe, i am looking at the carb and other issues. it appears to have an odd assortment (to me) of jets.
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September 22nd, 2007, 09:55 AM   #10
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Originally Posted by ned37
taff, you were always too technical for us.
but i will be trying out some of your info on darrin's 650 w/ the fcr41 this week when i get some new pilot jets. after fixing the pipe, i am looking at the carb and other issues. it appears to have an odd assortment (to me) of jets.
Dominic and I completely agree with you on the assortment of jets.

Darrin
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