Oh no, another jetting question - DVP needle vs ?
Posted January 31, 2002 - 11:39 AM
DVP needle 4th clip from top, 178 main, 48 pilot, 65 starter, 100 starter air, fuel screw 2 turns out - all this with YZ jetting, octopus gone, airbox lid off, and throttle stop cut.
I made this change at the same time that I went to YZ timing and the bike runs well, starts easy, and has never fouled plugs. But all this recent talk about E?? needles and APJ adjustments has got me thinking - am I missing out on something ?
The things that I do not like about the bike compared to stock jeting/timing:
- lots of popping when I cut the throttle and deccelerate at high RPMs
- the front wheel no longer climbs skyward when I snap the throttle in 3rd and 4th gear
Other than that, it has very smooth delivery, good torque, and revs out well.
So for you guys who maybe started with the jetting that I have now, and went to the new specs tested by Taffy, JD, and others, what did you notice ?
And since no jetting discussion is complete without it, I live a sea level and ride mostly between 0-3000', about 50/50 MX and desert. I'm racing Adelanto next month at 3000' and am hoping to dial it in beforehand.
thanks for any input,
Posted January 31, 2002 - 02:20 PM
the jetting you've got sounds rich on the main and low on the needle.
you could go down 5 on the MJ and lift the needle one clip.
the muts nuts in needles is the E series that JD "put us on to". although it started out as EKP it has gone more toward EKN or EMN (again for that first yard) and EMM like me.
we've also got pilot (re; slow) jets that are now screws so we can adjust. the Taff mod to your APJ is about 6 weeks old and the last thing i did before i sold it on boxing day.
Posted February 02, 2002 - 08:41 PM
To switch to an EMN/ELN/EKN will give more mid-throttle power (they are all the same except for clip position). These also are a step richer from 0-1/4 throttle due to the smaller needle straight diameter. EMM is another step richer from 0-1/4.
Why bother? The very 2 things you do not like now. A little richer from near idle(less popping on decel) and more rich in the mid (better wheelies).
The cost is under $20 (OCEMN needle and smaller main ~#170 from Sudco), and a some time adjusting to dial it in.
Posted February 04, 2002 - 07:30 AM
Any suggestion on a ballpark clip position to start with on the EKN ?
[ February 04, 2002: Message edited by: Damon ]
Posted February 05, 2002 - 06:39 PM