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Please check my Carb tune logic..........

  • Thread starter Thread starter Tim
  • Start date Start date
Skateguy50 said:
..., but isnt the "choke" more of a fuel thing than an actual choke so the fuel level might be part of it.
Click to expand...
Thanks for putting "choke" in quotes. :clap:

The cold-starting circuits on our carbs are not like car carbs, which have a plate that covers the intake throat, actually "choking" the inlet. The circuit on our carbs is more of an "enrichener" system that opens an auxiliary port for fuel and air directly to the outlet of the carb. When it is activated (by lever, knob, whatever), the vacuum generated by the cylinders pulls the enrichened mixture through that port, bypassing the normal jets. That is why it is important to NOT touch the throttle when using the "choke" to start the bike.

The enrichener circuit is fed fuel by that long brass tube that sticks down into the bowl, so it will draw fuel no matter what the level. The 'regular' jets, however, are rather sensitive to fuel level. Note that the tolerance is only +/- 1mm, and that's a pretty small range.

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Steve said:
The enrichener circuit is fed fuel by that long brass tube that sticks down into the bowl, so it will draw fuel no matter what the level. The 'regular' jets, however, are rather sensitive to fuel level. Note that the tolerance is only +/- 1mm, and that's a pretty small range.

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Click to expand...

Now I'm starting to feel like I will not be able to get it right. :eek:

Although I am going to attempt what was mentioned earlier about adapting a clear tube so I can see the actual fuel level. Now it all makes sense to me thanks to this post I had no idea what was going on in the fuel bowl prior to this moment.
 
Aaaaaahhh that makes sense Steve. So if I understand this correctly.......if my floats are set incorrectly the normal jets may not be getting the fuel at all. Thus if it only runs on full choke.........it may only be getting fuel from the auxiliary port (that "choke" tube). Hmmmm. The good thing about this is that before I did the tear down my "choke" was only working on cylinders 1 & 2. That tube you described was clogged on 3 & 4. So at least I know my "Choke" is working now. When my kids go to bed tonight I'll check the float levels.

Once again, and again, and again Thanks !!
 
About fuel levels ?

About fuel levels ?

You said to put the carbs in a vice and check with plastic tubing.But can i not check the level with engine running at idle? I just made 4 adapters for the bowls and plastic tubing.
 
Yes, that is actually the PERFECT way to do it.

As long as you can get your hands in there to remove the drain plugs and install your adapters.

Just be careful when you are done, that you don't spill gas on a hot engine and exhaust pipes. :eek:

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Last edited:
You said to put the carbs in a vice and check with plastic tubing.But can i not check the level with engine running at idle? I just made 4 adapters for the bowls and plastic tubing.
Click to expand...

Yes it is fine to check the fuel levels on the bike with it running. But if they need to be adjusted the carbs will have to be removed.

When I suggested he put them in a vice, it was because he had just finished rebuilding them. It is much easier to get the fuel level correct if the carbs are already off the bike.
 
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