MOPED ARMY

check out this attachment /\

I dont know what kind of carb you're running, but it's safe to say that you should be able to hit 9000 RPM with your set up.

no problem. with some decent tuning you should be able to hit 10000+ RPM.

i've built over a dozen polini's for friends and myself, 16/45 is the best set up for city light to light performance... i usually do 16/45 if i'm running a techno boss or a homeot 4p, and 17/45 on estorils cause the estoril gives great off the line response and the extra tooth helps on top end... if you wanna lower your rpms at higher speeds, the drop you rear gear to a 40 tooth and run 16/40...

Ok great it sounds like 16/45 is about where I want to be. That's about a 0.36 gear ratio. The rear sprocket I've already got is a 40 tooth, so I'm thinking a 14 front sprocket will get me to a 0.35 ratio, which should be just about right - correct me if I'm off base . . . the only thing that matters is the ratio, right? Thanks again for your help.

Yeah that's the thing I've got snowflakes. Should I go to 15 teeth (0.375 ratio)?

The air is much thinner around Denver

gearing no, but engine performance really suffers. Thinner air = less oxygen = less gas in mix to maintain proper fuel/air ratio = lower performance all the way around.

Denver is at 5,280 ft. (on the steps of the Capitol Building).

I live at 8,700 ft. in the mountains to the west and I have to run a 45 jet (stock is 65) in my 17mm. Amal and it's a little on the rich side.

James, if you live down around sea level then you should have more power than I do. I'd recommend a 15/45. Just drop a 15 front sprocket via circlip to change, and back out your tire to eat up the chain slack.

It's only a one tooth jump on the cheaper of the two sprockets to replace. The effect will be noticeable but not drastic, then you will have a better feel for what you want to do, if any at that point.