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i use motul sae10w40, service manual says 10w40, so oil are ok, i order new versah clutch plates.

my bore are airsal 70. i have new ebc spring.

Hello i want ask it is possible after changing 50cm3 to 70cm3 bore kit, clutch starts slip? I buy DT50MX 1991r with 70cm3 bore kit, and when i drive and put 5 gear and accelarate slow, everything are ok, but when i get full throtle my clutch slip. i change spring for new ebc, i measure old clutch plates and they are 3,45mm when new are 3,5mm .i dont have more idea what to do. Maybe someone here have dt50mx with bigger bore kit ?

what sprocket config you got? also what exhaust you have gianneli? maybe have some link to store when i get that one?

you have only bigger bore kit or exhaust also are tuned?

Hello im new here , and i got old 1991r Yamaha dt 50/70cc . I hope i be able to help someone, and i learn more knowledge.

thanks i do, btw in this 21mm carburetor i have 85 main jet and i start thinking its too small, but im not sure. I have 70cc airsal so its should go faster than 60km/h i read here about some dt 50 go about 40-50 mph and its about 80 km/h .

Hello everyone, im new here, and i want ask about carburetor size and jets sizes. I have Yamaha DT 50 MX 1991r. I have Airsal 70ccm cylinder, and Dellorto PHBG 21 carburetor, i buyed motorbike on that configuration, so i want ask that carburetor isnt too big for that cylinder, and also what you think what jets size i should use on it to get best performance, i read many topics and almost on everyone guys says 17,5mm carburetor are the best for 70ccm. Should i buy new carburetor ? Motorbike works, also i have unlocked cdi unit, but max speed what i get its about 55-60km/h. That speed are everythink what i can expect ? PS. sorry if i my question are dumb but this is my first contact with motorbikes.