Can anyone else answer this one. I had a 190 main in my bike and felt like it was a little lean with a kan n with the lid off. So I went to a 195 like everyone said in the jetting table and she slowed down 3 bike lengts. My friend has a 686 raptor that sparks built with fcr 41 on it. He was beating me by two bike lenghts no matter how far we raced. changed main jet and raced him and could not get within 5. what give. anybody got a piston by the way for as standard bore.

 

i run a 170 main in my wifes ds and it goes very well as a matter of a fact i've been accused of it being worked more than once, raptor guys. i think the ds likes lean a little[img]i/expressions/face-icon-small-smile.gif[/img]what gearing are you running? it also likes some lower gearing than stock, rather loose at top than all the way. we really like the 15-42 but the 14-40 is very good also

 

What make you say that it is running lean with the 190 in it??? any lean conitions taking place?






Bigger.