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Author Topic: Carburettor Information  (Read 10621 times)

Offline stroker crazy

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Carburettor Information
« on: Dec 17, 2013, 06:59:11 »
Btw I made a mystake about ooracing re-jet size:
- pilot jet is 48
- main jet is 97.5

Note that these are sizes for a carb with airbox removed and air filter (foam, KN style etc) fitted.
It works good on my bike with a straight-through exhaust but I'm still fine-tuning it.
I made the needle a bit richer and it improved the engine reaction. Please note also that on the stock carb there is no clip on the needle so you don't get the usual 5 positions. So you can make it richer by adding a small washer under it but there is no way to make it leaner if needed.
I also intend to try a 100 main jet as it seems in MY setup 97.5 might be a bit lean.

Maybe we could start a topic about owner's carb and jet combinaison ? Could be useful for other users. I for instance would be interested to know how big bore kits are jetted.
Could look like this:

OWNER          CARB MODEL       FILTER                  PILOT JET     MAIN JET     NEEDLE POSITION   IDLE SCREW   MIXTURE SCREW      ENGINE                 EXHAUST                            NOTES
Alan Vega       stock PZ26       metal cone filter         48               97.5              middle                         -                     1,5 out              stock 125cc         straight through dunstall     works fine so far

what do you think guys ?

An excellent idea from Alan!

I'm sure there will be many different carburettor set-ups, but a common thread will be a good place for people to find a starting point.

Crazy
“Ride like the Wind” W.H.

Offline stevodude

  • Posts: 93
Re: Carburettor Information
« Reply #1 on: Dec 20, 2013, 00:15:30 »
Not sure if I can link a Google spreadsheet, but maybe setup a google address you can then share spreadsheet?
Anyone can then make modifications on the fly, and hopefuly only modify your own entry, has previous versions etc.

https://docs.google.com/spreadsheet/ccc?key=0Atz-6DUQtyqKdFNHa2pDRDBRMURQOG5TQXhNUkFWTXc&usp=sharing

Offline stevodude

  • Posts: 93
Re: Carburettor Information
« Reply #2 on: Dec 21, 2013, 02:10:31 »
if you can't get to my gdrive spreadsheet, here is my current setup - subject to modifications. :-)

stephen   Stock PZ26   stock airbox   original 38/ooRacing 48   Original 90/ooRacing 80   not adjustable   2 out   stock 125cc   original - removed cat & 12mm hole in end

Offline vonmighty

  • Posts: 94
  • Skyteam Ace 125
Re: Carburettor Information
« Reply #3 on: Dec 23, 2013, 21:51:52 »
Does anyone know what the diameter of the hole of the stock jet is?

Offline Bojer

  • Posts: 109
Re: Carburettor Information
« Reply #4 on: Dec 24, 2013, 04:43:35 »
90 is 0.9mm if that's the question ?  :)

Offline vonmighty

  • Posts: 94
  • Skyteam Ace 125
Re: Carburettor Information
« Reply #5 on: Dec 24, 2013, 18:52:28 »
I believe my jet is blocked and need to shove something down it to clear it.. so was wondering the diameter if that makes sense

Offline orrible-64

  • Posts: 713
Re: Carburettor Information
« Reply #6 on: Dec 24, 2013, 20:53:01 »
sounds as if your needle and seat may have some rubbish in it..if carb overflows. remove float pin and clean.reassemble  and try?????

Offline vonmighty

  • Posts: 94
  • Skyteam Ace 125
Re: Carburettor Information
« Reply #7 on: Dec 24, 2013, 21:31:00 »
Did all that.. carb no longer overflows. However bike just wont start so thinking it might be a blocked jet...

Offline orrible-64

  • Posts: 713
Re: Carburettor Information
« Reply #8 on: Dec 25, 2013, 22:34:53 »
k do all the basics. check spark and (i know it sounds silly , but i got caught out)kill switch.

Offline stroker crazy

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Re: Carburettor Information
« Reply #9 on: Dec 26, 2013, 19:03:47 »
Everyone gets caught out with the kill-switch sometime or another!

Crazy
“Ride like the Wind” W.H.