theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Apr 17, 2012 20:49:09 GMT -5
I installed the Autotech Aluminum kit last night and tried to break it in today but ran into a pretty major issue (i already chop tuned it so we are not lean).
I can accelerate without any problems but then when i let off the throttle and try to come to a stop the engine dies.. sometimes i can save it by pulsing the throttle, but basicly i need to walk it down to an idle or up to WOT... seems like the whole mid area of my throttle is just gone.
once again i can go WOT to pretty much whatever RPM i want but after the initial WOT it cannot recover and especially if i let off completely it pretty much dies.
could needle position be causing this? or... any other ideas?
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Post by skuttadawg on Apr 17, 2012 21:02:30 GMT -5
Did you install a larger idle and main jet with the BBK ? Hows the fuel filter look ? A 2T or or 4T ?
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Apr 17, 2012 21:12:40 GMT -5
its a 2t, and yes its running a 100 main, but no did not up the pilot jet. fuel filter is new this year. starts and idles with no problem.
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Post by jmkjr72 on Apr 17, 2012 21:15:49 GMT -5
where is your a/f screw set at
you did retune it for the new kit right more then 2 turns less then 1 turn out and you need a diffrent pj
the needle shouldnt be playing as it sounds like its when it drops back down to idle
but it could also be a sign that your contra spring is weak and not pushing the sheave back in
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Apr 17, 2012 21:23:48 GMT -5
contra spring is a koso 1600 rpm bought it last year... so i dont think that could be causing it.
but im not totally sure what you mean with this:
"you did retune it for the new kit right more then 2 turns less then 1 turn out and you need a diffrent pj"
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Post by jmkjr72 on Apr 17, 2012 21:26:14 GMT -5
did you re adjust the a/f screw for the new kit
if you have it set at more then 2 turns out or less then 1 turn out that means you need a diffrent pilot jet
and where your a/f screw is will tell you what way in and out adjusts your fuel mixture
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Apr 17, 2012 21:29:39 GMT -5
Ok sorry yes i did but as im thinking about it i only did turn it out... maybe a full turn? what size pilot do you think would be good?
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Post by skuttadawg on Apr 17, 2012 21:55:40 GMT -5
Check the needle and diaphragm for tears as you may need to raise the needle up
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Post by 2strokd on Apr 18, 2012 8:40:49 GMT -5
If its softseizing your gonna ruin that kit if you keep running it that way. Im not trying to come off jerky lol. Just saying. Sounds like your running it out on the main, then shutting off the fuel supply to a lean pilot. A hot engine plus too little fuel (coolant)=a softy.
I agree with skuttadawg, raise the needle, lower the clip. Or try a bigger pilot. Even a better carb (best option IMO)
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Post by 2strokd on Apr 18, 2012 8:41:58 GMT -5
What is the oil/fuel ratio? Premix or oil pump? Could be an oil issue but i am leaning towards leaning.
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Apr 18, 2012 9:37:58 GMT -5
I think Ur right I ordered a new carb last night. Oko 21 mm
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Post by skuttadawg on Apr 18, 2012 21:42:29 GMT -5
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