douglee25
m3booooy
- Location
- South Jersey
It sounds like you're too lean. Try richening up your lows and high. The pop off should work there.
Doug
Doug
Carb Tuning Skinny Plz...
- Thread starter Yamah0
- Start date
Zane, I just did a similar motor as yours. I used a single 48 Full Spec
here is the jetting I ended up with
Main 155 H adj 5/8
Pilot 127.5 L adj 1 adj
2.3 n/s 115 grm spring
when I did this I consulted Ed. He stated, with the singles, the low jetting is a little funny & it could fall anywhere between 125 - 140
If you happen to read this before you tune today, please try this as a base line.
ski ya, Paul
here is the jetting I ended up with
Main 155 H adj 5/8
Pilot 127.5 L adj 1 adj
2.3 n/s 115 grm spring
when I did this I consulted Ed. He stated, with the singles, the low jetting is a little funny & it could fall anywhere between 125 - 140
If you happen to read this before you tune today, please try this as a base line.
ski ya, Paul
Hey thanx Paul... I didnt have a 155 or 160 so i put in a 150 H and the ski felt better.. so it definetly needs the 155 or bigger.
The Low right now is 137.5 which is what Ed recommended.
Im gonna put in some bigger high jets and see what happens.
Now should the jetting be a lil different between the 48 and 49?
Thanx for all the help guys:biggthumpup:
The Low right now is 137.5 which is what Ed recommended.
Im gonna put in some bigger high jets and see what happens.
Now should the jetting be a lil different between the 48 and 49?
Thanx for all the help guys:biggthumpup:
Jr. Magoo's said:
Bottom should be about the same as i have on right now 137.5 or do u mean the same as ur setup 127.5?
Also... what would the difference be between the 2.3NS, 115g and the
2.0NS, 95g?
Like what does it change in the runing charastaristics of the motor?
Thanx Paul.
2XLR8 said:
Zane, the differance with the N/S will be very minimal in your application. you might want to try it once you get everything as best as you can with the regular jetting. just to use as a final tune.
the 137.5 is the pilot jet that I feel will be best for you, mainly because if the climate you are in. I have been working with another indidual who is in an arid climate as you. he is experiancing similar tuning issues as you are. all his settings seem to be several points higher than what would normaly be required. keep us posted as your progress continues
ski ya, Paul
the 137.5 is the pilot jet that I feel will be best for you, mainly because if the climate you are in. I have been working with another indidual who is in an arid climate as you. he is experiancing similar tuning issues as you are. all his settings seem to be several points higher than what would normaly be required. keep us posted as your progress continues
ski ya, Paul
Ok... i got around putting a 160 main jet but left everything else the same.. i dunno im sorta confused. I think that initial delay got minimised a bit but the ski feels sluggish and heavy at times..
How do i know if the 160 is too big and i may need a 155 or 155.7? Same for the low jet!
I had the top screw anywhere between 5/8th to 1/2 out and bottom screw anywhere between 1 and 1.25 out.
I know its really hard trying to tackle carb tuning on a forum or over the phone.. but what can i do :dunno:
:banghead:
Thanx
Zane...
How do i know if the 160 is too big and i may need a 155 or 155.7? Same for the low jet!
I had the top screw anywhere between 5/8th to 1/2 out and bottom screw anywhere between 1 and 1.25 out.
I know its really hard trying to tackle carb tuning on a forum or over the phone.. but what can i do :dunno:
:banghead:
Thanx
Zane...
Last edited:
I don't think being off by a few points in the main jet can make the response around the turns be that bad. I would try adjusting the high mixture screw both in and out and take note of where it seems to work better coming out of turns. This will tell you if you need to lean or richen the mixture. It is possible that you may be feeling the high speed mixture and you are trying to compensate with the low speed circuitry. What I can't understand is with that pitch impeller -that large of a nozzle AND that cone, it can't be in transition from low to high for more than a fraction of a second.You should go right past any hesitation or blubbering. Maybe its something else
shepster
Living the dream!
- Location
- united kingdom, Jersey
Hi, Any luck ? Would be interested in seeing the final jetting specs, trying to get my ATP 48 dialed in at the moment.
James
James