help jetting 4mil cub with 35pwk

[460yfz]

I need help jetting my bike. i have a 4 mil 68mm cub,18cc domes, 35pwks,rdz pipes, open k&n filters. running 45 pilots, dgk needle on 5th clip and 160 mains.

has real bad bog on bottom end. thats not pull very good, like it wants to but it can't. I moved my needle clip from the 3rd clip to the 5th and got a little better.

dissapointed in cub. no low end at all have to rev the hell out of it to take off or it will just bog down and take a while for it to come up.

3200 ft. elevation

190 psi on each side., running vp c12

my other banshee with stock bore, porter and polished, stock carbs, t5's, vito's superstock pistons, beats the cubbed banshee by about 8 bike lenghts. is this normal or is my jetting off that bad on my cub? please help thanks.

Edited April 25, 2006 by 460yfz

[sheefreak]

You need to do some tuning. It would be worth your money to go to a dyno and start making some test runs. I don't know from experience, but you should not be disappointed w/a cub.

[odaen]

at 3500 elevation, I think your needle and main are very fat. I don't have much experience with higher altitude jetting, so maybe someone else can chime in here.

 

page 129 of the 2006 sudco catalog has a needle chart for the PWK carbs. i know at sea level, I run a CEL needle in the 3rd clip. and I run the same main jet as you have now.

Edited April 25, 2006 by odaen

[rzcolobanshee]

At that elevation you probably need 145-148 main and around a 35 pilot

[2bzy2p]

its not the cub!!! are u runnin gas i assume?? what are ur pluggss gapped at?? what plugs u runnin?? wheres your timing set at??you do want a slight fat while idleing or youll run out on the top end which =s BANG!!! new top end!

Edited April 25, 2006 by 2bzy2p

[locogato11283]

at 3500 elevation, I think your needle and main are very fat.  I don't have much experience with higher altitude jetting, so maybe someone else can chime in here.

 

page 129 of the 2006 sudco catalog has a needle chart for the PWK carbs.  i know at sea level, I run a CEL needle in the 3rd clip.  and I run the same main jet as you have now.

507605[/snapback]

i agree. you sound way rich. have you checked the plugs after wot run?? i would get a cel needle as well. seems to be what most ppl run. your jetting is what i run in my 4mm cub with 35mm pwk at 1000 feet...check ur plugs..

[460yfz]

what spark plugs do you guys recomend and gap. yes i'm running gasoline c12.

thanks for the reply's

[blueshee03]

i'd try dek needles middle clip 150 mains and 40 pilots and tune from there.i'm at 3000ft

Edited April 25, 2006 by blueshee03

[2bzy2p]

id run ngk b8es or b9egvs gapped about .20-.25..id go with about .23 myself

[s-540]

check your float hieght first. mine was off by 2mm. made the bottom to fat.

Edited April 25, 2006 by s-540

[460yfz]

going to check float while apart. it supposed to be something like 16mm right.

from the gasket surface to the botoom of the float with the carb upside down.

[No Limit Powersports]

9 times out of ten bogging is to fat. PWK's have so many different options on the needle that sometimes it takes some trial and error to get it right. Dont give up theres no way a OEM stroke/cylinder on gas will come close to a properly set up 4 mill cub. I would def try a diff needle to start something fatter and not tapered as much.

Edited April 25, 2006 by bansheestang

[wesw]

playing around with mine.

 

they dont seem to like rich pilots and needles. dont know if its cause of the extra transfer ports the cub has compared to stock or what, heard the cubs are more efficient.

 

i would try a 50 pilot, if you run that needle try the 4th clip and a 150 mains.

 

kinda working on my stuff also

[2bzy2p]

more effecient????wrong!!! cubs or tripple ports waste more fuel!!

[Ducman]

FWIW, My +4mm stroke 68mm cubs like a leaner needle on my TM 34mm Mikunis than my +4mm ported stock cylinders did. The cubs seem to be much more sensitive to the needle setting and bogged way worse than my stock cylinders with the needle just a little bit too rich. They seem to run great on the same size pilot through.