Starving for gas maybe?

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Mpgmotobiker

Mpgmotobiker

New Member
Oct 30, 2012
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0
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Milford, Delaware
I have a brand new RB80 black motor. Its suppose to have a bigger bore intake. It also has a stock carburater on it. It has no power. When it gets up into higher RPMs it acts like its out of gas until the R's go back down. I can coax it up a little higher but it just doesn't want to go. Help.
 
crassius

crassius

Well-Known Member
Sep 30, 2012
4,032
158
63
USA
Have you put on enough miles to seat the rings yet? Brand new motors run like crap till then.
 
Bikeguy Joe

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,837
252
63
up north now
No necessarily. I have had some that make a little less power, and maybe vibrate a bit more until broken in, but they don't "run like crap".

Things to check include gas cap venting properly, float height, and proper carb setting.

Also, it could be four stroking, which is common. A two stroke SHOULD break into a four stroke/two stroke "break" when there is a light, or no load on it.
 
maniac57

maniac57

Old, Fat, and still faster than you
Oct 8, 2011
4,484
22
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memphis Tn
Wait till you have at least three or four tanks of fuel through it before you start tuning. They need to be broken in first.
 
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