Roller advice

[JackDaniels]

I just had a full engine rebuild on my 50cc yamaha jog rr and the guy who did it put 3x 3.5gram and 3x 7 gram rollers in ???
the top end speed has dropped to 25mph and the acceleration is terrible
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2006 Yamaha JOGRR>2010 Yamaha Ybr>1995 Honda CB400 Superfour >2005 Honda hornet>1999 Suzuki Bandit 1200 > 2002 BMW R1150GS > 2013 Tiger Sport 1050 > 2007 GSXR 1000 > 2005 GS500E

[Martay]

Has it got an aftermarket or standard exhaust? Has the jetting been touched?

Try searching through just about every other moped speed/acceleration thread.

HTH
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Eat well, poo hard
Drives: Cavalier 2.0 16v
Rides: Slightly ratted Honda City Express

[JackDaniels]

[Martay]

Maybe your speedo has suddenly become accurate? Sorry

So its been rejetted to suit the exhaust and 5g rollers? This bloke then swaps them for 3g ones. Someone on here will explain how the rollers affect power/speed, i cant be bothered! By swapping rollers, the 'power'band has moved, the variator isnt doing what its ment to because of this, meaning your only getting 25 out of it. Wack the 5g rollers back in, hey presto.

Are you sure its running ok? Check the plug. When was it changed? Try putting a new plug in it.
____________________
Eat well, poo hard
Drives: Cavalier 2.0 16v
Rides: Slightly ratted Honda City Express

[craigT19]

3g rollers arnt heavy enough to expand a standard variator setup... YOU NEED MORE WEIGHT!!
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Bikes owned :- 2001 nsr125, 1999 zx6r, 2006 yzf-r1, 2009 xmax 250, 2012 yzf-r1, 2015 MT-07
Current bike : - 2016 MT-10
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