I have a '95 S110P that does not go into high idle when cold. I have to feather the throttle for 2-3 minutes to keep it running, and it creates a lot of smoke, which smells like unburnt gas not burnt oil, during this time. After it is warmed up it starts instantly, idles smoothly, and doesn't smoke. Some things I have tried/observed: - I watched a very good Youtube video by 'fupabox' regarding carb adjustments on an S83P. It appears nearly identical to my S110P. All the external linkages are lubed and the adjustments he goes through all work -- except I have to hold it in high idle when turning that adjustment. When I remove the intake air tube, the butterfly is basically closed when it is cold, and slowly opens up maybe 15-20 degrees as the engine warms up, so I think the wax plug mechanism is good(?). - The coolant flow through the choke mechanism is good/clean. - I've replaced almost every vacuum line, still haven't gotten to every single one, but only bought 20' of vacuum line... - There are some color-coded plastic things in the vacuum lines around the carb and choke mechanism, and I have no idea what they are supposed to do. I can not blow through the yellow or green one from either direction. There is a brown one, and it allows flow from the carb towards the vacuum pump, but not vice versa. - There is a vacuum device (don't know what you call it) that has a small arm that pulls on a lever attached to the high idle adjustment area. This is to make it idle up some, but not all the way to high idle, when the A/C is turned on -- and that works. Turning on the A/C is my cheat to try to get the thing warmed up without have to sit there and baby the throttle. I believe this problem happened all at once, but am not certain of that. I lost the timing belt last spring, and by the time I got that fixed and put the head/valves back on, it was pretty warm out so it is possible I just didn't notice it until last fall when it got cold. It quit dead on me this winter, and I chased that down to a bad fuel cutoff solenoid. I removed that and filed off the tip, and now it is back to this "getting lots of fuel, but no high idle to burn it" problem. It does diesel slightly after shutoff sometimes, but I'm OK with that versus $165 for a fuel cutoff solenoid. If anybody has any ideas for me to try, I would really appreciate the advice. This is our go to rig for cutting wood and working around the place. I'm not much with carbs to begin with and all the vacuum lines and components are pretty confusing.