View Full Version : needle settings ys91 sr with Hatori SB19FH
vboy55
10-26-2008, 06:22 PM
I need some help I got a trex 700 and haveing nothing but problems tunning this motor does anybody have setting i could start with? It seems that the factory setting are nowhere close i have gone out as much as 10 clicks on the needle (hover and top end and it runs very rough:DOHNEED SOME HELP PLEASE
george0079
10-26-2008, 06:40 PM
First question.... Do you know that the needles on the YS are backwards from the OS91?... The long needle is the hover, and the short needle is the highspeed....
vboy55
10-26-2008, 07:03 PM
This is the only big motor I have owened so to me the os is different but yes I know the needles
It's that I'm so far off the manual settings and going ritcher
george0079
10-26-2008, 07:11 PM
What fuel are you running?
vboy55
10-26-2008, 08:41 PM
Wildcat youngblood with a os 8 plug
CoronaL
10-27-2008, 09:34 AM
ys should be close to dialed in at factory settings
I would take all the needles out and blow out the holes to make sure you don't have any flashing or dirt/metal in there from the machining.
After that, it should again run well at factory settings.
vboy55
10-27-2008, 02:19 PM
Took the exhaust off today and found the one of the o rings was crackedi took the needles out and cleaned them off and blew air into the holes to try to remove anything that was in there have to wait till tomorrow to get the rings here and i will try it out and let you guys know thanks for the help!!!