Problems tuning a Zeda Dio Reed build

kelso

New Member
Apr 21, 2019
1
1
3
108
I recently started building a Zeda motorsports Dio Reed engine on a Specialized mountain bike.
The build itself is complete and now I'm in the world of tuning. however I'm running into a bit of a wall getting this zed to run properly.... It has a 21mm OKO pwk carb and will ONLY RUNS WITH THE CHOKE ON. Choke off or down i can get a decent idle but it still "searches" here and there. how running it with the choke on (up) i can get it to run and up to speeds of around 30.... but it has zero power on any kind of incline. if i put the choke down it will bog out until it dies... I've put about 40 miles on it all with the choke on.... is she rich? is she lean? I'm getting signs from both worlds

pilot jet is a 40
needle is positon 2
main jet 60.... currently best with small jet. tried 88, 90, 96,100,110,115 and 125.... 125 wouldn't even turn over once...

I've played with the needle and the main jets.... nothing seems to be changing for better or worse. i thought it was rich but now I'm conflicting signs it could be leaning out...
i posted pics of my setup below. any tips would be greatly appreciated !!

problems it could be....
1. dirty carb
2. wrong jet
3. air leak
4. stock exhaust with upgraded carb
5. bad seal/gaskets
6. wrong mixture of gas currently 20:1 for breaking period
7. float bowl
IMG_1201.jpg
IMG_1202.jpg
IMG_1203.jpg
IMG_1204.jpg
IMG_1205.jpg
 
Last edited:
  • Like
Reactions: fasteddy

Venice Motor Bikes

Custom Builder / Dealer/Los Angeles
Mar 20, 2008
6,609
416
83
Los Angeles, CA.
It sounds like you need a slightly bigger pilot jet.

Also... you have all your vent tubes blocked off.
One is a float bowl vent... (that needs to be open to the air).
One at the bottom of the bowl is a overflow tube
Another at the bottom is a drain tube &
another is probably a oil injection tube... (that needs to be blocked off)

Post some close up pics of the carb tubes & we'll try to figure out what's what. (^)
 
  • Like
Reactions: fasteddy

Cbr_rider1000rr85

New Member
May 16, 2020
6
0
1
35
I just purchased the same engine 80cc dio Reed valve with the Oko carb just got it all installed and I'm having the same issue it don't wanna run and only runs with choke up (on) doesn't have any power. The place I bought it from sent me 3 different size jets for the carb I'm gonna try swopping em for the next size... If anybody can help us out we would greatly appreciate it. Thanks
 

haXXsaw2012

New Member
May 18, 2020
2
0
1
49
I just purchased the same engine 80cc dio Reed valve with the Oko carb just got it all installed and I'm having the same issue it don't wanna run and only runs with choke up (on) doesn't have any power. The place I bought it from sent me 3 different size jets for the carb I'm gonna try swopping em for the next size... If anybody can help us out we would greatly appreciate it. Thanks
Sounds like you have an air leak. Runs with choke on it's getting air somewhere and with no power it's not getting compression. Check your seals and head.
 

Cbr_rider1000rr85

New Member
May 16, 2020
6
0
1
35
All the gaskets and seals are brand new... I did notice there is no windows piston installed in this engine, could that cause it to act like it's acting?
 

Cbr_rider1000rr85

New Member
May 16, 2020
6
0
1
35
Sounds like you have an air leak. Runs with choke on it's getting air somewhere and with no power it's not getting compression. Check your seals and head.[/so I decided to pull the cylinder jug back off and install a window in the piston and I noticed while putting the engine back together first thing there's 2 cylinder/crankcase gaskets on at one time in the same spot... Is that okay or would it leak? Plz lmk if anyone knows thanks
 

haXXsaw2012

New Member
May 18, 2020
2
0
1
49
All the gaskets and seals are brand new... I did notice there is no windows piston installed in this engine, could that cause it to act like it's acting?
I did read someone else saying for the Reed and oko it has huge volume and the window piston is necessary to bring that all into the engine.