This is something I've been thinking about for a long time. I'm not really a fan of kitting mopeds until I know all the ins and outs. I think too many kids are buying mopeds that don't run right and opt out for a kit thinking that's going to be a universal save. Then, it comes as a surprise when the thing still doesn't run right.
I'm a fan of trying to tune a moped the old fashion way. There's way more skill involved getting a moped to move without a kit. It's actually pretty rewarding, too.
This is out of context from another post:
"one kid was at 1977 the other day and couldnt figure out why his bike wouldnt idle with a 15 mm bing carb. he had it jetted pretty high and had a bullet exhaust.
Just a word for the wise, 15mm is a huge carb for a moped that isn’t kitted. Stick with a 14 mm if you aren’t going to kit it and work on other mods instead.
on another note, if you do decide to kit it, the 15 mm is a great set up. my boyfriend runs a 64 cc polini with a 15 mm bing (which is recommended..) and does 50 all day with no problems.
learning how to tune your moped properly is totally worth it, though. it’s way more rewarding going 40 on a 50 cc moped than slapping a kit on it and having no idea why it wont run right."