Archive through September 08, 2019

[aewald]

Let me see if this helps describe my problem with my 128, Engine can run fine in low idle no choke. Throttle up and half choke, engine starts to put like a deere. I took a video of it. https://youtu.be/EzJjeU39qX4

Thanks, Austin

 

[mfrade]

Austin E., looks like you need to adjust the high speed jet. The proper procedure is in the manual. And I think Charlies FAQ has a how-to as well.

 

[kide]

If'n I was standing next to it, I'd probably say it has two carb problems 1: float too high.. 2: High speed circuit plugged (assuming that it won't run up without the choke). But that's a diagnosis from beyond chargeable range and you know how much free advise is worth..

Why? It's puffing black smoke (unburnt gas from being way to rich at low speed) and you have to choke it to get it running above half speed (you're now out of the low speed/idle circuit and into the high speed circuit that's not feeding enough gas to run without choking it, which makes it suck more gas through the idle circuit and / or some from a mostly plugged high speed circuit.

 

[kaweimann]

Austin, is the condenser attached on the points side (negative) of the coil? Are your valves adjusted to the right gaps?

 

[aewald]

Kenny,
The condenser is on the neg side.

Now that I set the main jet and idle to factory settings, it will run with choke on BUT it throttle up high and a red glow out the exhaust. Would this be because its running a bit lean? I'll go check the valves

 

[kaweimann]

Sounds like exhaust valve

 

[aewald]

I went to go adjust the valves, turns out exhaust valve was out of spec, fixed that. intake valve was fine. Still runs fine on choke. But once you take choke off it dies.

 

[dschwandt]

Austin,
Do you have good clean constant flow of fuel from the sediment bulb to the carb????
Have you installed a new needle valve and seat??

 

[aewald]

David S,

Theres a good stream of fuel coming from the tank.
This is a cheap amazon so should have new needle valve and seat

 

[kide]

Your high speed (main jet) passages are plugged or the main jet is undersized. Choking it increases the vacuum at the venturi in the carb, which increases the fuel flow, but with a bad air/fuel ratio. You've pretty much defined the problem (Cheap Amazon replacement). Quality control is really poor on these ripoff of good design carbs.