Recent content by RevB

Mostly incorrect . Everything made after the early 80s has switched to materials that are ethanol agnostic as it doesn't do anything to them. Pre Buna-N orings were the common failure and after the switch to Buna-N no more problems. Same holds true with diaphragms.

Most likely the impulse port for the fuel pump diaphram in the carb body.

Hence the need to exactly specify which engine gets the same carb spec as the OEM carb. If you cannot adjust them they are pre jetted for a specific displacement engine.

Almost forgot....the old spark testers were just neon bulbs in a non conductive pen except for a cupped aluminum cap that fit over the plug wire. If the bulb lit up, spark. Also useful to check electric fences to see if they're on or not.

An inexpensive IR thermal gun is worth its weight when diagnosing some problems. Objective measurement beats subjective measurements every time. 😏 Well...that's just not true. As an aviator of injected engines, you may have the capability to run rich of peak EGT or lean of peak EGT......rich...

Seems to me you're out voted by "broad brush" real world experiences. What you may think is a Yamaha may not actually be a Yamaha but one in name only.

A Kawasaki is a better bet.

On my 731 the plug leads are carbon track type....meaning they have a carbon impregnated string carrying the electricity to the plug. I cut the rubber boot off and found that the cap had not been fully crimped to the lead and did not contact the carbon string. Replaced both caps with these...

How do you know it "overheats"?

Sounds like "what he can do" will resolve itself......

Obsessing over straightness and angle is unnecessary. Whatever the angle, irregardless of "straight", when the steel blade hits the grass blade the steel wins. Every time. A dull blade tears, a sharp one cuts.....for awhile. Be more concerned about balance.

Loosen is not removed....mud daubers love, for some reason, to build mud capsules in the muffler. Make sure that's not the case. Otherwise, remove carb, disassemble, inspect and blow all passages out with at least 30 psi or higher. What you describe can be either fuel starvation or blockage. I...

https://www.amazon.com/SIMPERAC-Carburetor-RY252CS-RY253SS-RY251PH/dp/B0BWF5CMX2

F4040 Tygon yellow fuel line is rated for gasoline.....not all yellow, or for that matter, any color, lines are gasoline rated.