bored .40 SS440 jetting?

[2003VIPERER]

i have an 82ss440 and i had it bored to .40 over and i was wondering if anyone knows if i have to change the stock jetting at all. it runs good but seems to run rough at times. any help would be greatly appreciated.

 

[daman]

Try stock jetting then go from there..whats plugs look like???

 

[2003VIPERER]

I Do Have Stock Jetting And The Plugs Look Fine. Just Seems Like I Always Have To Mess With The Air Adjustment Screw Depending On The Temp. I Thought Maybe Cause I Bored It Out I Need To Change The Main Jets. It Runs Better With The Choke On When Going Slow But At Wot W/out The Choke On It Runs Like A Raped Ape. But When Going Slow With The Choke Off It Wants To Stall Out.

 

[daman]

Sounds like yo need to richen up mid range a little,does that sled have a float bowl can't remember..i think so???

 

[mrviper700]

then you need to address the low and mid range circuit in the carb, the pilot jet size needs to be bigger. The main jet doesnt have any effect on low and mid speeds only 3/4-wide open. Install the next biggest pilot jet and adjust the air screws and it should run alot better. When you use some choke and it runs better your putting a band aid of sort on the pilot jets being too small. does it still have the butterfly carb on it?

 

[2003VIPERER]

yes it does have the butterfly carb on it
thanks mr viper
daman: yes it does have float bowl

 

[daman]

Ok, need to jet up a little then with the pilot and adj. the screw.

 

[2003VIPERER]

thanks

 

[daman]

Let us know how it goes..

 

[2003VIPERER]

Will Do