5k Carby Problem

[aussierider]

Hi all

 

Having some problems with a 5k installed in my ke70

 

Specs

Mechanical full pump

Tighe mid range (cam154 or something I Can't Remember the exact number)

Extractors

fully rebuilt head

Re curved dizzy by performance ignitions (to suit cam 95 petrol and the 32/36weber i previously had on it)

4k carby with weber main jets 130 primary 155 secondary

fuel is a little old it was 98 when put in tank, plus i just recently added some octane booster to be sure.

 

Problems

1)Its pinging badly at around 3000 RPM under light load with the secondary enabled

2)If the secondarys are connected and the give the engine a hard clutch kick its as if the throttle cable will stick on (isn't the cable though checked by putting foot under pedal and pulling it back) and hold the revs at 3000+ Rpm until you change gear or switch the engine off.

3)If i disable the secondarys its only pings slightly at around 3000 RPM under heavy load

 

Things i have done so far:

1) I was having the same problems with a 32/36 weber which i removed because it was annoying me and it wasn't idling at all.

2)fitted the 4k carby with stock jets the car then idled a better and ran a little better

3)rebuilt 4k carby and changed the jets from stock (106 and 153) to 130 and 155 weber jets (only ones i had laying around and they seem to work) this enabled the car to actually maintain an idle under 1500RPM and reduced the pinging

4)pulled some timing from the motor curenntly set to 6*degrees (sticker said to set to 10*)

this reduced the pinging a little as well.

 

Now my questions is do i just keep going up in jet sizes? or am i missing something simple?

Also will it matter that my distributor was recuvered to my current specs but for the weber, not the 4k Asian carb ?

 

Any help would be much appreciated as right now i feel like setting it alight and watching it burn to the ground.

 

thanks

[Raven]

Checked for vacuum leaks?

[aussierider]

Yeah fixed two, coming from vacuum lines, and the base gaskets are all new. I'll probably check the it again though.