the fuel distributor contains a diferential pressure valve.located inside a hex nut (remove the air filter case) this valve is inexpensive and operates whit the fuel warm up governor presure variations, the noozle or injectors needs hi presure to operate in hot engine normal temp.this valve gets calibration adding a washers (stainless steel) .
REcently change a valve it comes whit instruction and a lot of washers . be carefull whit the piston, spring , is very important each part.
sorry gramatics
hablo espaņol
soy MEXICANO
mi name is Alberto