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Odd screw
Mar 13, 2017 11:55:57 GMT 1
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Post by spanker on Mar 13, 2017 11:55:57 GMT 1
Hi all Can someone confirm this should be a breather tube and not a random screw. What affect would this have on running? Thanks This hole is linked to the emulsion tube chamber.  |
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Post by museumman on Mar 13, 2017 12:40:11 GMT 1
What's the carb code above the oil feed?
The 1GU carb has a plastic elbow there for a breather that rests up on the frame under the seat. My 1GU carb is slightly different to that though.
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Post by spanker on Mar 13, 2017 13:04:28 GMT 1
the code is 12a-00
ive seen some with a breather but also with no breather here bit confused?
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Post by wonkywheel on Mar 13, 2017 21:10:32 GMT 1
the code is 12a-00 ive seen some with a breather but also with no breather here bit confused? It's a breather pipe and it shouldn't be blanked because it affects the fuel air ratio. This is the aspect 2stroketony was talking about on your other thread about the Leda Kit. The plastic breather was repalced by an air jet screw ( I think smaller) by tapping out the hole- then screwing the the air jet screw in. Is your emulsion tube tapered- just wondering whether you have a part Leda kit fitted? |
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Post by spanker on Mar 13, 2017 21:51:39 GMT 1
no the emulsion tube isnt tapered I think its a standard one, there arent any threads as such were this screw is it looks to be just a self tapper screwd in. so is this the main air jet? i thought it would have been in the rear part of the carb were the main air comes in? its like the one on the right on this pic rdlccrazy.proboards.com/post/236107/thread |
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Post by wonkywheel on Mar 13, 2017 23:05:34 GMT 1
So it looks like you have a standard emulsion tube.
The main air jet (pilot jet) is on the opposite side of your carb- a long tapered screw with a spring and O ring.
I'm not a carb guru- but i don't think there is a great deal of difference between a Leda correction air screw and the plastic nozzle type, although blanking wont help- yet it should still rev out.
Your symptons relate to 3/4 + throttle=main jet. Once that is changed, you will know whether the carb is the problem. If it is, then you can fine tune.
Loads of forum members have successfully used a 12a carb with a Micron- with a main jet and neddle position change. I have used a DT carb with success.
You'll sort it 😎
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