Twin Carb Tuning

[Jono.B]

Hi all, i was just after some help with tuning my twincarbs, they are the stock ones off a srcoupe that i have on my 4k with extractors and exhast and full ignition system, anyway, i havent got my lumpy cam yet so i was wondering if someone could tell me the most basic way to tune them to go their hardest, 9i can fine tune) in simple talk.

also i find sometimes when i accelerate hard, the revs don't drop fully , and i think its to do with the throttle return spring, is there supposed to be one on each carb, has anyone else had this prob,

 

any help would be appreciated

 

Cheers, jono

[philbey]

When you say stock ones, you mean the Aisan Twin downdrafts?

[calaissix]

Hi all, i was just after some help with tuning my twincarbs, they are the stock ones off a srcoupe that i have on my 4k with extractors and exhast and full ignition system, anyway, i havent got my lumpy cam yet so i was wondering if someone could tell me the most basic way to tune them to go their hardest, 9i can fine tune) in simple talk.

also i find sometimes when i accelerate hard, the revs don't drop fully , and i think its to do with the throttle return spring, is there supposed to be one on each carb, has anyone else had this prob,

 

any help would be appreciated

 

Cheers, jono

sounds like it maybe the dashpot ,bit hard to say without looking at it,as for the return spring question ,make sure the linkage that joins the carbs opens and closes the carbs correctly,full throttle and back to the stop(idle speed)screws on both carbys,if your not sure seek help from a mechanic,as a mechanic ive seen people play with things they don't understand and cost themselves more money,just ask them to have a quick look and quote you and get a few quotes.find an older mechanic as many younger mechanics will struggle with twin carbs.hope this helps