Honda Spree and Elite 50 Forums

Rebuilding a 1982 NU50 Urban Express. I installed a 70cc kit with corresponding head. IÔÇÖm going to need to change out my jetting as IÔÇÖm planning to run a MLM sidebleed pipe from treatland and a pod filter with the stock carb. Asked about the jetting on moped army and IÔÇÖm getting all sorts of wild answers all over the board, all from non Honda owners. IÔÇÖm new to 2 strokes, is there anything I need to replace like the reed (it appears fine)? IÔÇÖm also going to run premix and IÔÇÖm in Denver. Simply looking to get my 260lbs to 30mph without getting creamed, thus the 70cc upgrade.

Seeing that the spree uses a similar engine, is 90 to 93 on the jet a decent range? If not what would be good? Also, what would be a nice and safe range for the premix?

id say jump atleast 10. if its a 70 go 80. you still might need to go higher. id rather start a new barrel richer than leaner

Greetings:

I agree with HR IF the bike was a local Mile-High machine to begin with. However jet numbers from Florida and coastal states won't work at 5000 feet, or at least not very well. Not much Oh-Too up there.