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Geo Hahn
Yoda
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I have probably posted this problem before but as it recurs every time hot weather returns and nothing I've tried resolves it, I'll have another go.
Once the engine is well warmed up I get a coughing stumble coming off idle after sitting through a long stop light. More info:
Happens in hot weather (mid-90s or so). All other aspects of running seem fine - plugs and the usual methods all suggest the mixture is about right. I have to use the choke whenever the engine is cold even on warm days - so that also suggests to me the mixture is not far off.
I am using premium gas (Shell) & 20W50 oil. The engine never overheats.
I installed a homemade heat shield under the ZS carbs - does not seem to help.
I have tried both lighter and heavier oil in the carbs (everything from MMO to 20W50) and still get the stumble.
If I goose the throttle a bit (like a teenager) before starting to move I can more or less prevent the problem.
Sure seems like the intake is just loading up with fuel while I sit and has to clear its throat before normal running can resume.
The one thing I can think of that I have not tried is adjusting the float level in the carbs. These are ZS so the float sits right below the carb body. It is possible that one or both floats are partially sunk - if I go to the trouble of pulling the carbs apart I will probably go with solid floats.
What am I missing? Would misadjusted (or partially sunk) floats account for this (I would expect other problems from that but have none)?
It is really just an annoyance but still I feel I should be able to make it better. Thanks for any ideas.
Once the engine is well warmed up I get a coughing stumble coming off idle after sitting through a long stop light. More info:
Happens in hot weather (mid-90s or so). All other aspects of running seem fine - plugs and the usual methods all suggest the mixture is about right. I have to use the choke whenever the engine is cold even on warm days - so that also suggests to me the mixture is not far off.
I am using premium gas (Shell) & 20W50 oil. The engine never overheats.
I installed a homemade heat shield under the ZS carbs - does not seem to help.
I have tried both lighter and heavier oil in the carbs (everything from MMO to 20W50) and still get the stumble.
If I goose the throttle a bit (like a teenager) before starting to move I can more or less prevent the problem.
Sure seems like the intake is just loading up with fuel while I sit and has to clear its throat before normal running can resume.
The one thing I can think of that I have not tried is adjusting the float level in the carbs. These are ZS so the float sits right below the carb body. It is possible that one or both floats are partially sunk - if I go to the trouble of pulling the carbs apart I will probably go with solid floats.
What am I missing? Would misadjusted (or partially sunk) floats account for this (I would expect other problems from that but have none)?
It is really just an annoyance but still I feel I should be able to make it better. Thanks for any ideas.
