My Friend Nick got a 2002 yamaha blaster with fmf power core 2 and fatty pipe k&n air filter fmf main jet ( came with pipe) and a bigger frount sproket and he says it seems like its stock any ideas as why it is not got power and speed??? plz help him out

 

Did he remove the airbox lid? If not that makes a big difference if jetted properly.

 

maybe the clutch is slipping?

 

I see that you said he got a bigger front sprocket. That could explain the feel of a loss of power, and with those mods it would bring it back up to the feel of stock. I changed my front from a 14 tooth to a 13 tooth and if feels a TON more powerful. As for top speed, it should be faster. Just a guess.

 

he got a 14 tooth front spocket

 

if hes been riding it for more then 20 hours i think u might need to repair the top end on it. thats what im learning some friends of mine told me that for 2 strokes u need to repair the top end every so often and im thinking about doing it to mine because it wears down and is not like it is when stock when they repair it it goes back to stock and u will feel the power difference. hope ive been some help

 

dude, 20 hrs. no way. its smart to change it ever 6 months like buy new rings and gaskets and get it honed, but not 20 hours. umm that sprocket i beliece is larger than stock. like stock is 13, and if u go up 1, u will take away a lot from ur top and add to ur bottm. this could be y it is running slow topend.

 

by the way. if u remove ur lid and get a 12 tooth front sprocket, that will help topend and power all around because of the increased air.if u have a good matching jet, with thos mods it should be close to 300 id say for a main jet/

 

hey if i were to get a new sprocket i got a few questions. what is the best brand name, and what size should i get for the front and back for my 2003 blaster. im curious so any input helps

 

no when u go up on the front sprocket it INCREASES the top-end not the low end.makes the gears longer.