g'day long time lurker first time poster and let me say what a great site and wonderful resource.anyway i need help with a carb problem.after fitting carbs with morleys jet kit and 2in1 2in1 hmf full exhaust i get a stumble just off idle to about 2000 rpm also when cruising at very small throttle openings to about 4000 rpm and crack it open i get a hesitation stumble. the bike idles good runs good to red line all gears.its drivin up the wall:bang head: carbs are 155 mikuni main 170paj stage 1 DJ needles second down from blunt end mixture screws 2 1/2 out. carbs are clean with no issues i can find. also i'm at sea level. i've tried to be as thorough as possible with symptoms and setup.carbs were birdopreys thanks. i hope you can help thanks in advance
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I agree, may need to open up the mix screws a bit more. And if problem still persists you can try using a washer to shim the needle (washers are used to get a 1/2 position instead of the full clip position).
Sean
Sean
sorry i meant to say raised. moved clip to pointy end and symtoms got worse.i would'nt of thought needle to have as much an effect at just off idle and very small throttle openings.also i forgot to say slides have drilled standard springs.
naughtyG
Well-Known Member
So did you try moving the clip the other way? Did it improve things?
just by ear screw in till misses turn out till recovers + 1/2 turn .and been fiddlling with them in and out as you do trying to find a happy place. i cant seem to find the sweet spot .which is why i ask about paj2 what effect do'se it in regard to tuning.
not 100% sure on paj2, i'd ask one of the experts.
u happen to have someone who can get an a/f reading on the screws for you? i could never hear it right , but once i brought it to the dyno shop to set the a/f the idle really changed and it helped.
u happen to have someone who can get an a/f reading on the screws for you? i could never hear it right , but once i brought it to the dyno shop to set the a/f the idle really changed and it helped.
PAJ 2 effects a pretty wide range but we have mostly seen it in the mid area. I think fargo has done some recent testing to prove what it did for him.
Sean
Sean
RagingMain
Well-Known Member
It affects all ranges, even the idle circuit.
no worrys thanks thank fellers i'll keep tinkering and i'll get it right eventually.it's good to able to pick your brains .the vmax has been around a long time and anything and everything that can be done to it has been done.most of it by sean morley judging by what i've read on here.sean morleys jet kit is very comprehensive.i just need to find the combination.im sure someone here has had the same problem and corrected it.
update i just swapped dj stage1 needles for stock units and its much better off idle and mid range. runs out of puff in the top end though leaning out.needs fattening up in the mains.what mains are you fellers running with simular set ups at sea level. cheers
yeh i've got 155s now think i'll go up 160s see how it go'es .im here in townsville australia its like florida weather i imagine hot and humid in summer not so bad know though
RagingMain
Well-Known Member
Take it from me, do one step at a time. Trust me, dont aske me how I know this :bang head:
Go to 157.5s. One size makes a noticable difference
Go to 157.5s. One size makes a noticable difference
