s-7 nozzle

[MOLE111]

seeing how were on this subject already , i also have an 01 cr250 , would i notice much difference after i install the s-7 nozzle ? i'm currently running fmf sugested jetting at sea level and i'm not very happy , it still loads up pretty easy on trailing throttle and blubbers and throws spooge out the silencer at 40:1 . some have mentioned changing to a keihin carb but i can't afford that right now. i ride mostly off road , what jets are you guys running with the s-7 nozzle .

 

[sandrider02]

I'm going to install mine this weekend and I'll let you know if I notice a difference. I also have an fmf pipe and have the same problems your having so hopefully it will work. I've heard good things about putting the S-7 nozzle in.

 

[MOLE111]

ride report sounds great , what main , pilot and needle position are you going to run with the s-7 ? thanks

 

[sandrider02]

I'm going to ride it with the stock jetting except for the nozzle and see how that works. Then I'll adjust it if its not running right.

 

[john stu]

does anybody know the correct part# for an s-7 nozzle ?and where can i get one

 

[sandrider02]

here's where I got mine http://216.37.204.206/wps/Yamaha_OEM/YamahaDB.asp?Type=13&A=146&B=9
part #- 3TC-14141-S7-00

 

[dodgeaspen]

What is the difference between a S-7 and a S-8??

 

[MOLE111]

i believe the difference between the s-7 and s-8 is the diameter of the inner taper .

 

[MOLE111]

sandrider
did you test the s-7 nozzle today ? did it make a difference ?

 

[bailout123]

Hello all,
I just installed the S-7 in my 01 CR250 and it runs much better, but I still have to play with the jetting. I'm running 30 Slow jet, H2-75 second clip, 430 main and air screw 1.75 out. It idles great, runs much better, but I'm still getting A LOT of Spooge. Pre mix is at 32:1 WP. The plugs looks very close to the Perfect Color one EG has on this page http://www.eric-gorr.com/techarticles/sparkplugs.html
but the treads are black (oiled) all the way up. Any Ideas? I really don't know what is causing all that Spooge. Low, Mid or Main setting?
I want to run a H2-76 next weekend and see how it does.

I am in Arizona 1100 Feet MSL, temp today was 76 during my ride.

 

[IRISHCOFFEE]

i have the same bike and use the s-7 also. i reall feel a 50-1 ratio with modern oil is better. never had a problem. good luck.

 

[sandrider02]

I just got back from riding all weekend in the sand. The bike ran so much better with the s-7 nozzle. Didn't foul any plugs all weekend. Its still running rich but I kept it like that cuz I was on the sand. But I definetly suggest you get the nozzle, its worth the $20.