the xt and tt use the ydis carb, it will be slightly richer as the 2nd carb butterfly valve will only just be open but as the secondary carb is a cv carb the vacuum will have lifted the diaphram operated slide raising the needle slightly too thus giving a richer mixture
kinda irrelevant to me though as i have junked the yam carb and fitted a pair of 32mm mikuni's but i have done some head work and fitted a high comp 3mm oversize piston  which is more than the ydis carb is designed to cope with
__________________
XT 630 SUPERMOTO
GSXR750L  KMX200
RF900 & GSX400X Impulse Projects
3.9 V8 Rangerover
|