another ICT jetting ...

[ots03]

I have a set of dual ICT clones (empi epc)..Looking to the specifications I find in the web they are jetted
1.75 Needle & Seats, .130 Main Jet, .55 Idle Jet, .160 Air corrector Jet

I fell some Spitting/sputtering/cracking during acceleration and I think maybe they need bigger jetting..

wich jetting option do you sugest ? (stock 1600 w/engle 100 )

[mharney]

Sounds like they need more fuel, yes. Step up to a 135 main jet. Set your floats correctly too. Make sure your timing and valve adjustments are right, and that your ignition dwell is correct. All these things matter.

[Alister]

Don't trust the specs listed - take 'em apart and see for yourself what's in there. They'll have to come off in order to get at the idle jets, I'm sorry to say; and the mains go in at an angle, which make it near impossible to get 'em back in without removing the carbs first.

Mine were supposed to have the same jets, but I wound up with 130 mains, 52 idles, and 140 ACs. Haven't figured out how to remove the emulsion tubes yet, without damaging them... so I don't know what those are.

I didn't have the sputtering under acceleration that you seem to (mine's not even close to stock anymore, for that matter), but a rather nasty hesitation off-idle and at very low throttle, accompanied by surging. Going to 140 mains, 55 idles, and keeping the 140 ACs corrected most of it, though I feel the idles may still be a touch lean.

Also bear in mind the idle jets control fuel flow up to about 2/3s throttle, when the mains take over - tune these carefully, as this is where most of your driving is done!

If you need to adjust the floats, be careful! ICTs/EPCs are very sensitive to float adjustment! Mine were dead-on out of the box.

[mharney]

The idle jets are only engaged in the very early stage of throttle on these - maybe 10-15% throttle. The idle jets tend to work out best around 55-60.