I got the 18mm carb,thanks for the help guys!another question I had was would a 16mm carb off of a 50cc pit bike work as well,the reason I am asking this is because the guy I got the 18mm from gave me 4 16mm carbs super cheap because he had no use for them they are from a 4 stroke sdg 50cc dirt/pitbke if that helps,just curious because now i have all these carbs and really only need one any info would be appreciated thanks.
more nubie mikuni carb info help!again
- Thread starter scabz24
- Start date
thanks again,Ill try not to ask so many stupid questions,just want to build my MB right the first time.,
I have a vm16-516, which is for a 4 stroke or rotary valved 2 stroke (has bleeder 5 holes in the needle jet) on a 66cc with ports widened a little, top of exhaust port ramped & top of piston ramped in exhaust port area, bottom of intake port ramped also, rocksolid billet head & sbp x chamber. Carb is fine, 25 pilot jet & 72.5 main jet. Cheers
Hey Ivan I was rejetting my carb today and found out mine has the bleeder holes as well. I am still running a bigger jet then you but I am down to a 90 main now . I am going to have to buy some more jets now .
Hi Headtrauma, hows it goin. Well I put a bit longer pipe off the header on the sbp x chamber, a 2 & 5/16" length instead of the just under 2" I had to bring the power down in the range so as to be more useable with the gears & after a good 1/2 hour run the plug is the very lightest tan. The c clip is in the middle so I might drop it down a notch. Cheers
Hi ivan weve spoken before, the 16mm will work best if you have the mixture perfect, i run a 15.15mm dellorto and it is a beast, the 18mm might be a bit large for this engine, as we are running very similar setups in my sig
how did increasing the length go.?
Hi Rocksolidperson, hows it going. Yeah, the extra length is going well, I dropped the c clip down a notch on the needle in the carb & the plug is a good healthy color now, about perfect. I agree with u on carb venturi size, too big & u loose velocity so even if theres enough negative pressure to draw the fuel up it doesnt atomise or mix as well. I think that the smallest size venturi that will flow enough air to do the job is always the best one to use. I'm waiting on a rocksolid pull start at the moment, I may order reeds next. Cheers
Tip. These carbs r 4 rotary valved 2 strokes or 4 strokes & have bleeder holes in the needle jet. Air enters thru these & mixes with fuel. If u have trouble tuning in the 1/4 to 3/4 throttle range take off air cleaner & block off the drilling at the very bottom of the air intake to stop this happening. Cheers