New Engine: Take Off Issue

Reggie Curry

New Member
Joined
Jul 30, 2020
Messages
8
Alright, so I've recently started running this new case reed motor here with a 21mm OKO carb (all stock jetting). Current mix is 40:1....

I've already fiddled with the air mixture screw on it to where I've got good idle and clean throttle response when I blip it. However, every time that I try to take off and crack the throttle 1/4 of WOT, the motor instantly dies. However, if I just BARELY turn the throttle (like, maybe 1/6 of WOT) while I engage the clutch, it'll take off no problem. Rides real well, too.

I'm not sure if this is a case of the motor getting too much gas, wrong air mixture screw setting or what... two other motors that I had never had this problem, though they were just stock engines or were your standard ported cylinder ones with the stock carbs on them.

So...what am I to do here? I'm not sure where to start...😖
 


Wrench

Well-Known Member
Joined
Nov 14, 2018
Messages
1,641
What notch is the needle clip in now? Is it real hot where you live?
 

Reggie Curry

New Member
Joined
Jul 30, 2020
Messages
8
What notch is the needle clip in now? Is it real hot where you live?
Currently, it's in the middle position (there are five positions on this particular needle). I've tried setting it to the first notch just to see what would happen (no improvement). The carburetor came with the clip in the fourth position, and yeah. It gets pretty hot around here; usually in the 90s during summer and early fall.
 
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Chainlube

Well-Known Member
Joined
Jan 5, 2020
Messages
1,663
What pipe are you using? A stock pipe probably isn't going to let the exhaust out fast enough to be effective with that reed.
 

Reggie Curry

New Member
Joined
Jul 30, 2020
Messages
8
What jet numbers are you using?
Not sure, for I've yet to check the pilot and main jets in this thing, though someone in Zedamotorsport's Facebook group says that it's stocked with a 41 pilot (or possibly a 38) and 105 main.
 
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