Need Help quick

[bansheeyfz]

Alright it back fires and breaks up in 4th,5th and 6th gear. Also It dosent seem like it has as much low end as it use to .

Set up right now

pro flow kit -no lid

T5's

Cool head 21cc domes

boyseen reeds on stock cage

MAIN-158

Pilot-52

a/s-1.75 turns out

4th CLip

 

What should i do

I have 50 pilot s

160 and 155 mains.

[burleybanshee]

I would do one thing at a time. If it is backfiring in 4th-6th, tells me your main is lean. I would put in the 160 and see if it gets better. The Pilot jet should be right in the neighborhood for your bike. Maybe the 55, i doubt on these carbs you will be lower than the 52's. Everyone keeps comparing the 34pj or 35pwk pilot numbers to these 30oko's and you can't. They act differently. The carb is a pwk 28 knockoff. the 30mm comes from boring out the reed side of the tube on the upper part of the tube. It measures 30mm up and down and 28mm across, just fyi.

 

My 4mil runs t5, 165 psi, boss intake, k@n filter with pro design, air box cut away, vf2. It liked the 55 pilot with neddle all the way up, bottom clip position and 162 main, 1 3/4 turn out on idle screw. The pilot was pumped to a 58 with the needle second clip from top 1 1/2 on idle screw and was perfect on the sniffer of the dyno. I know its hard to compare 4mil to stock , but it shows you a ball park, espically if you have bigger pipe than t5's and play/dune port.

[bansheeyfz]

I damn problem is i cant take i out and test because my neighbors will flip shit.

If I go down to a 50 pilot will it get rid of the bog?

[burleybanshee]

Normally a leaner idle will be crisper not bog, unless you are way lean. With the current idle jet you are running I doubt you are way lean, so going down should crispen up the throttle response.

[dajogejr]

I'd be more worried about backfiring at 4-6 than I would be off idle....gonna do more damage at higher RPMs than lower...

[bansheeyfz]

I'd be more worried about backfiring at 4-6 than I would be off idle....gonna do more damage at higher RPMs than lower...

 

does that mean lean?

[dajogejr]

I've seen it backfire both ways, too much fuel trying to be burnt...and not enough.

More often than not...it's lean.

 

However, what do your plugs say???

[Justintoxicated]

is it a misfire or a backfire?

[bansheeyfz]

?

[dajogejr]

Well...what have you done since?

I understand not being able to go for a rip due to neighbors...believe me.

But...you gotta get out and ride it somewhere, some way to figure this out!!

[bansheeyfz]

I actually just got on it a lil. it felt better. it was probably runnig like shit because of the higher altitude. but if it was rich up there it would have to be even richer down where i just rode it.

it has 158 main

52 pilot.

[burleybanshee]

I don't understand? What do you mean it must be richer down there. If you drop in elevation your bike will lean out more do to more air density.

 

How was the idle-off idle response? did it get better? how was full throttle?

[bansheeyfz]

I don't understand? What do you mean it must be richer down there. If you drop in elevation your bike will lean out more do to more air density.

 

How was the idle-off idle response? did it get better? how was full throttle?

 

wait i thought when you go up in elevation you get more air?

[dajogejr]

I made that mistake myself. (in a long, drawn out bitchfest of a post a while back, I might add...)

 

Your jetting richens up at higher elevations, it leans out at lower elevations....

 

Think about it. If you go to Denver (mile high city) you are out of breath easier...the air is not as dense.

 

With less air...you'd get more fuel in the mixture (richening it up)...

[MDS2106]

I think your main is too big.I run 152 mains,55 pilots and I am dune ported with K&N clamp ons at sea level, all jetting was on a dyno.By the way these 30mm carbs like bigger pilots than most of the bigger carbs.When we first hooked it up to the sniffer i had 48 pillots in it and it waaaaayyyy lean on the bottom.It looks like i will probabaly end up changing the needles also.