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The shape differs slightly depending on each aftermarket manufacturer. Even the same #90 is likely to have different performance and characteristics if the manufacturer is different. Even the hole diameter may be different, so be sure to use the same manufacturer, such as only ○○co for the main and only ○U for the throw. This also does not lower the sticking coefficient.

4. No secondary air✓

Be sure to check. When disassembling and reassembling, secondary air intake often occurs, especially when replacing or introducing new parts. Overlooking deterioration of seals and gaskets. Assembling the joints out of alignment (work mistake). Overtorque (distortion and cracks). Parts selection mistake (inner diameter does not match, necessary parts such as insulators are not included). Improper installation of each screw or throttle. These are the only possible causes of secondary air intake that I can think of. Work carefully when assembling, and if you feel anything strange, check with a parts cleaner, etc.

5. No problems other than the carburetor

Engines that have been used and in poor condition may have problems other than the carburetor. In addition to fuel adjustment, be sure to check that compression and sparks are okay. Even if they were fine to begin with, it's a good idea to check any other areas you can while you're there.

So.

Checking the spark plugs while setting them up is professional and visually OK for a story, but I rarely check them unless there is a serious problem. It's fine if you want to fine-tune it at the final stage, but I'm satisfied before that, so I don't usually look at them. This is a method that only adjusts the running condition, so it may not be suitable for people who want to write about it on SNS.

This is a memo for setting up. This is a summary of the things I paid attention to when setting up the PC20 carb I used before.