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Post by magoconnor on Jun 17, 2019 8:45:11 GMT -5
Do you guys think a 94 main jet is good size jet to start with?
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Post by dexameth on Jun 17, 2019 9:19:01 GMT -5
Do you guys think a 94 main jet is good size jet to start with? With a pod filter, sure! Seems good to me. But about that a/f screw o-ring: if that crawled up it would allow more AIR to pass by the o-ring causing a leaner mixture. Good catch! Let us know the results once correctly assembled. |
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Post by GrumpyUnk on Jun 17, 2019 13:04:06 GMT -5
If the O-ring was not sealing against the adjuster screw body, I think it would allow air to leak past. It would also make the idle mixture become very erratic. I think. As the rpms changed, the vacuum pulling fuel through the jet & emulsion tube, past the needle, the air leakage would change in relation to the pressure/vacuum developed... ugh. Very erratic. I think.
I don't see how a good adjustment of mixture could be done with that sort of leak. When you go to re-assemble, you may want to slightly oil the O-ring so it can slide into the opening without binding on the edges of the different sized bores. The spring & washer should put pressure on the O-ring so it seals on the adjuster shaft, and also seals on the i.d. of the drilled passage. No matter where the adjuster is in its range, the spring should hold the seal tight against the shoulder inside.(and tight against the adjuster scre shaft)
tom
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Post by magoconnor on Jun 30, 2019 13:03:52 GMT -5
Ok so I fixed the air screw with a new o ring.
No difference what's so ever....................
This fucking engine just dont wanna run.
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Post by FrankenMech on Jun 30, 2019 17:49:18 GMT -5
These engines are not that difficult. One cylinder, one spark plug, one ignition system, one carb, fuel, air, compression, spark...
Check the service manual and follow it precisely step by step.
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Post by GrumpyUnk on Jul 1, 2019 7:25:45 GMT -5
Mag, 4 pages in, and it's difficult to keep track of what is/is not going on.
Can you recap? I think it's a BBK with a cone filter setup. You have fiddled with jet changes, and now are in a no-start. Correct me if I am wrong.
My last problem child was with a start-run-die, so have a mental problem handle right now.
Have you tried using a spray or squirter to poke fuel directly into the intake side of the carburetor? Generally, doing that will give the engine a 'rich' mix at the start, and as you crank it over, there will be less and less liquid fuel, changing the fuel:air mixture as the fuel gets ingested. Finally, the engine gets a mixture that is burnable, and the engine will kick over for a few seconds until the mix gets too lean.
If you continue to squirt or dribble fuel with the engine kicking over you may be able to do some idle mix and idle rpm adjustments so the engine starts to run more continuously on the carb-supplied fuel:air mix.
IOW, get it running, sloppily at first, and diddle with the carb with the engine running raggedly.
Check your seals. Between the intake elbow and the machined cylinder head surface. The O-ring gaskets tend to flatten with age & heat, and can start to leak, mucking up the mix(lean). Check the rubber end where the carb outlet gets stuffed in. Make sure it is in position, all the way rather than partial.
Set the idle mix @~ two turns from fully closed. Set the idle hard stop 1.5 turns from when it starts to open the throttle plate. You have to watch closely to see the start of motion, and go from there. Not rocket science.
The cone filter will have most of its effect at higher rpms, but some carbuertors need the restriction of the air cleaner assembly before they will run properly. Sometimes you have to retreat from where you are, go back to fully 'stock' setup, and then change things one at a time until you can advance to replacing 'stock' with the parts you want to use long term. I personally am not a fan of cone filters. I don't think they add much, I may be wrong, but I'd sooner have the less peaky torque and power of the factory parts. And, they don't mind the rain or road splash.
tom
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Post by magoconnor on Jul 2, 2019 14:50:05 GMT -5
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Post by dexameth on Jul 2, 2019 15:34:23 GMT -5
You should not need the extra ground.
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Post by magoconnor on Jul 4, 2019 17:51:57 GMT -5
 IDLING AT LAST !!!!!!!!!!!!!!!!!!!! I Came to my senses and tore off that 20mm carburetor from hell, and threw it far out in the field. After that I replaced it with a nice 24mm carb, and what ya know the darn thing fired right up and held a steady idle. Today was a good day 
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Post by dexameth on Jul 8, 2019 9:46:54 GMT -5
Where did you get the old 20mm from? Still, happy to hear the 24mm worked out!
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Post by diynuke on Oct 25, 2019 10:41:33 GMT -5
 IDLING AT LAST !!!!!!!!!!!!!!!!!!!! I Came to my senses and tore off that 20mm carburetor from hell, and threw it far out in the field. After that I replaced it with a nice 24mm carb, and what ya know the darn thing fired right up and held a steady idle. Today was a good day  good to hear that.
i still kind of have this sort of problem with 3 new carbs. but when it gets colder it does run idle so its probbaly an mixture issue but ill find that out in the summer again ;D
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