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There is TOO MUCH info on carbs and how they work. Taffy is right, a correct and thorough cleaning is what is needed first. I will attempt to put the jets back to the configuration they were when I started. Changing jets in this case may be simply addressing the symptoms and not the problem. For the bike to suddenly change so drastically something broke or clogged.

Some folks refer to different jets by different names, this is not helpful to people like me trying to get a handle on things.

If cleaning and returning to the original configuration does not help, I'll try to return it to stock configuration.

Finally, I will look at issues with ignition. My cheap inline spark light thing looked like the color was orange- I can't find info on the internet confirming this is a problem or not, plus it was my weak kick producing the orange light. Bike seems fine other than under load in first gear so I was thinking more about carb issue than electrical.

My owners manual shows stock settings for my FCR-41 as:

main jet: 182
Jet needle: OBDVT (OBDVR)
idle jet 38 (40)
main air jet: 200
idle air jet: 100
Needle position: 5th from top
Starting Jet 85
Mixture screw 1.5 turns
carb ID number: 4125B

Does this sound correct?

<blockquote data-quote="chriscaris" data-source="post: 189198" data-attributes="member: 22282">There is TOO MUCH info on carbs and how they work.&nbsp; Taffy is right, a correct and thorough cleaning is what is needed first.&nbsp; I will attempt to put the jets back to the configuration they were when I started.&nbsp; Changing jets in this case may be simply addressing the symptoms and not the problem.&nbsp; For the bike to suddenly change so drastically something broke or clogged.&nbsp; Some folks refer to different jets by different names, this is not helpful to people like me trying to get a handle on things.&nbsp; If cleaning and returning to the original configuration does not help, I&#039;ll try to return it to stock configuration.&nbsp; Finally, I will look at issues with ignition.&nbsp;&nbsp; My cheap inline spark light thing looked like the color was orange- I can&#039;t find info on the internet confirming this is a problem or not, plus it was my weak kick producing the orange light.&nbsp; Bike seems fine other than under load in first gear so I was thinking more about carb issue than electrical. My owners manual shows stock settings for my FCR-41 as:main jet: 182Jet needle: OBDVT (OBDVR)idle jet 38 (40)main air jet: 200idle air jet: 100Needle position: 5th from top Starting Jet 85Mixture screw 1.5 turnscarb ID number: 4125BDoes this sound correct?</blockquote>

[QUOTE="chriscaris, post: 189198, member: 22282"] There is TOO MUCH info on carbs and how they work. Taffy is right, a correct and thorough cleaning is what is needed first. I will attempt to put the jets back to the configuration they were when I started. Changing jets in this case may be simply addressing the symptoms and not the problem. For the bike to suddenly change so drastically something broke or clogged. Some folks refer to different jets by different names, this is not helpful to people like me trying to get a handle on things. If cleaning and returning to the original configuration does not help, I'll try to return it to stock configuration. Finally, I will look at issues with ignition. My cheap inline spark light thing looked like the color was orange- I can't find info on the internet confirming this is a problem or not, plus it was my weak kick producing the orange light. Bike seems fine other than under load in first gear so I was thinking more about carb issue than electrical. My owners manual shows stock settings for my FCR-41 as: main jet: 182 Jet needle: OBDVT (OBDVR) idle jet 38 (40) main air jet: 200 idle air jet: 100 Needle position: 5th from top Starting Jet 85 Mixture screw 1.5 turns carb ID number: 4125B Does this sound correct? [/QUOTE]

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