average fuel mileage of chinese 2 strokes

You might be running to rich? What is the color of your plug? It should be brown not black. (not black like mine lol)

212MPG? that guy's nuts. most ads claim 150mpg, and even that's pretty far-fetched.

my average is closer to 100-120mpg. depending on how i'm riding.

i had another bike that averaged about 80mpg.

65 mpg on my stock engine, 70 rejetted, 110 with 0.050'' off the head and now about 125 with a puch head, port clean up and a 16mm dellorto.

Thunder - I dunno who toldja a 10% reduction in fuel consumption after break in & I can't swear to it*... but I'd say that's a conservative estimate at best. All the HTs I've dealt with GOBBLED fuel madly for at least the first 3 tank fulls, then tapered off slowly as the engine broke in and was dialed in for proper fuel/air/oil mix etc. As a rough example, if a 2 stroke is running rough & "4 stroking" (common w/new & untuned motors), it's firing every other stroke... wouldn't that be a roughly 50% loss?

It's a touch more complex than that also - just like with cars where even "little" things like driving with the windows down will have an impact on efficiency, so too our motorized bikes are heavily effected by other variables like riding style, gearing, weight, drag (tires, bearings, chains), environment (hilly, rough), etc.

The smaller the engine - the more profound the effect, but as both bairdco & mountain demonstrated, stock engines fair the worst with "tuned, performance" engines getting far better mileage even if ridden hard (baird's ain't stock BTW lol).

Part of the problem with factory stock is poorly matched gaskets, manifolds & ports - I'd strongly suggest at least matching the gaskets if nothing else & alla that stuff can be found here: http://motorbicycling.com/f13/basic-porting-16646.html


*"can't swear to it" = I've never actually bothered to figure my exact fuel consumption, just trips to get more gas. Getting two gallons at a time a new engine will need another trip about once a week, whereas a nicely tuned & broken in one requires about two gallons a month for me (daily drivers/commuters)... so very roughly - it's 1/4th the consumption over stock/untuned or a 75% increase in efficiency... ofc there's a ton of variables but still, it's a pretty good demo - even 1/2 that is far more than "10%"

Hey - can you tell me how much one would expect to pay someone to punch & port?

I guess you need to take this to a shop... any recommendations (any small engine repair or other kind of machine shop)?

Thanks!

-TW

I've put about 4000 miles on the 66s and usually averaged about 85MPG. Sometimes as low as 70 and sometimes as high as 100. Mind yall, my bikes were loaded with bags and baskets.

I get about 65-70 after upjetting, running 36T and a low restriction exhaust. I gotta pick up a gallon tank and actually test it out.