Is that for a 2-stroke or 4-stroke engine?my 48cc will sit on 55km/h on the flat but with a little tail wind it will sit on 60km/h, top speed down a moderate hill has been 68km/h
only mods that i have done is matched the inlet and exhaust manifolds to the ports removing any burs, leaned of the carby as the stock carby is the same for both 66cc and 48cc (much to rich for the 48cc), fitted an expansion chamber off a 48cc pocket bike and changed the rear sprocket from the stock 44 tooth down to a 28 tooth
Very important point in a really old topic but what the heck right?Is that for a 2-stroke or 4-stroke engine?
I really gotta say that 40mpg is not very good gas mileage for 53cc, heck my 212cc race bike gets at least 40mpg ...Very important point in a really old topic but what the heck right?
A chance to learn.
2-strokers commonly come in 48cc and 66cc though the bad joke of anything being called 80cc is a flat out lie, it's so persistent it just won't die.
4-strokers the 49cc HS 142F and Honda 50cc are common and it's a thread saying 49cc.
Most anything around ~50cc get engine gears to take advantage of the small power source.
Unless I purposely limit power for a given customers needs or abilities, 30+MPH on ~50cc is common in my builds because of gearing.
What I have been doing the last few months is try to get away from 2-strokes as much as possible and use lower power 4-stroke engines like the 49cc 142F and 53cc 144F HS engines.
With the right 3-speed back hub ~35+mph is the baseline for them.
This is a 53cc 3-speed that does 40mpg with ease, even maintained 30 uphill for a mile+ stretch.
Hehehe, 40 MPH not 40 MPG ;-}I really gotta say that 40mpg is not very good gas mileage for 53cc, heck my 212cc race bike gets at least 40mpg ...
Most stock mopeds advertise 5mpg. I would think that a motorized bike could get at least what you say. Is the 40mph on the flat? How is the torques for hills and takeoff?Hehehe, 40 MPH not 40 MPG ;-}
Realistically on the shifter bikes I build it's ~75MPG, or ~50 miles with a 2.5L 2/3 gallon tank.
50 miles on pocket change with today's gas prices is pretty cool, bus fare is more than that.
KC!A direct drive will get you ~32mph and not be too sluggish off the line.
Putting a SBP shift kit on it changes everything.
It jumps of the line and will do ~40mph with that 3-speed internal rear hub.
I know this is completely off topic, but I wanted to say thank you for the inspiration to build my Cruiser!
No way man! That IS the SBP shift kit, hd freewheel. I just have the case for the left side chain tensioner on there without the tensioner. Here's a picture from the other side. Didn't go with cheap ANYTHING on that bike, lol. Notice the shock front fork with disc brake and ape hangers. This one was build to LAST (hopefully!)
And you are welcome for the inspiration ;-}
Bummer you went with the old cheap knock off shift kit though...
Use the real thing from Sick Bike Parts next time, you have the outdated mounts and the el-cheapo freewheel bearing, and that will likely bite you in the ass soon.