after 5 tanks bad gas mileage???

brydonb

Member
Joined
Jun 6, 2008
Messages
75
Okay so my bike is finally smooth sailing, everythings loc-tite tight, everything works fine. why do I not have the good mileage? I am running an 80cc chinese kit on a 26" mountain bike. I use a 20:1 mixture and i am getting im sure only like 60 miles per tank, is this normal? I weigh 180lbs. some input would be greatly appreciated!!
 

relaxxx

Member
Joined
May 2, 2008
Messages
96
That equates to about 75 MPG which sounds a little better that what I get. I've got the same motor but I'm 230lbs and only get about 50-60MPG (40-45 KM/ tank). I could probably get 75MPG if I took it slow and easy but I end up full throttle more often than not.
I'm Kind of ****ed because the 150MPG claim was one of key features that made up my mind to order one. I can see if it only got 110-120MPG because it was rated for 180lb rider or something but 50-60MPG is weak.

You got the 44 tooth sprocket? Top speed about 25MPH - 40km/h?
 
Joined
Mar 16, 2008
Messages
688
If you have gone thru 5 tanks I would change the fuel/oil mixture. I would go to 30:1 or 35:1 using a quality oil, with a synthetic oil I have heard as high as 50:1...
 

brydonb

Member
Joined
Jun 6, 2008
Messages
75
That equates to about 75 MPG which sounds a little better that what I get. I've got the same motor but I'm 230lbs and only get about 50-60MPG (40-45 KM/ tank). I could probably get 75MPG if I took it slow and easy but I end up full throttle more often than not.
I'm Kind of ****ed because the 150MPG claim was one of key features that made up my mind to order one. I can see if it only got 110-120MPG because it was rated for 180lb rider or something but 50-60MPG is weak.

You got the 44 tooth sprocket? Top speed about 25MPH - 40km/h?



i use the 42 tooth sprocket and i have reached 57km/h
 
B

BSA

Guest
Do you turn your fuel valve off when you turn the bike off. Does the petlock leak at all.

BSA
 

mcassMB6

Member
Joined
May 18, 2008
Messages
76
Perhaps you should evaluate the octane fuel you are using. I just learned on this site that these engines are low compression, so you should run as low of an octane as possible (87) which apparently gives you improved performance over say 93.
 

brydonb

Member
Joined
Jun 6, 2008
Messages
75
Perhaps you should evaluate the octane fuel you are using. I just learned on this site that these engines are low compression, so you should run as low of an octane as possible (87) which apparently gives you improved performance over say 93.


I do use the low octane, (cheapest gas), i think it is 87 octane
 
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