Dave wrote on 06/18/23 at 03:03:24:ThumperPaul wrote on 06/17/23 at 18:24:10:This is your air/fuel mix screw. It is exposed and ready to tinker with. See the other link I sent. Turning it clockwise will make the mix leaner. Counterclockwise is richer. Get the bike to idle as good as you can with the idle screw (I'm guessing to got that). Go for a short ride and get the engine warm and up to operating temp. Now...with it idling, gentle move the Air/Fuel screw 1/8th to 1/4 turn counter clockwise (richer). Pause...
Listen... If the engine picks up RPM in about 5 seconds stop. If the rpm drop or it dies, go back to start. Then go the other way (clockwise, leaner) and try the same thing. You are trying to find the sweet spot where the rpms are max. Once you get it better going in one direction, keep slowing going that way (slowly)... When the rpms drop off, go back about 1/4 turn or so until is sounds good again. You may have to adjust the idle screw down once you find the sweet spot. Be patient and do things slow and easy! The engine may not respond immediately to the little adjustments you make. Listen carefully to what's going to. This is "dialing it in"...
I agree with what Thumperpaul has said.....however I believe you need to lower the idle speed to around 800rpm to properly adjust the fuel/air mixture. (At the normal idle speed of 1,100 rpm the slide is up a bit and adding fuel/air......it is impossible to make an accurate adjustment of the idle fuel/air screw).
Get the bike fully warmed up and and hold it upright so the cam oils properly (the left side of the cam starves for oil when running on the sidestand). Drop the idle speed down to around 800, adjust the mixture screw for the smoothest idle, then raise the idle speed back up to 1,100 rpm. This adjustment should take a minute or less once you get used to doing it. Once set......you should not have to change it again - however you can experiment by moving it 1/4 turn either way while riding and see if it affects the amount of noise from the muffler when you close the throttle or shut the bike off.
Here is a good video that illustrates the sound you are looking for while adjusting the fuel/air screw. It is a Honda - but the sound you are listening for is the same.
Thank you, but I don’t know what RPM’s I’m at, I’m totally blind. There’s no tac. I’m scared to touch anything on the carb. I really feel like I’m gonna screw it up more than it is.
In other news, I’ve got a fork seal leak, The bike ran pretty well today, not really backfiring, starts right up…I dumped some carb cleaner in the gas tank a few days ago, and it’s improving the performance I think…but the bike gets so hot and it’s running rich, I know it is. It’s high idle at high speeds. The vibration is bad. Like when I turn the throttle more than half way, it feels like it’s gonna vibrate and the rpm is really fast. I’m scared it’ll blow up. However, I’d I’m easy on the throttle, it’s fine. I lost my air vent cover on the road today. Not the medal one that’s the color of the bike, the one that actually covers the vent. I’m so sad as it’s an OEM part, original to that bike. I can’t find it anywhere. I live in a small town and traced my riding but it’s totally gone. I drained some gas out of the carb from the bottom, where the float is, that screw. Looked at the gas and it’s got some stuff floating around in it, small particles, couple bugs. The gas tank needs to be cleaned, there’s a surface layer of rust setting in, I’m unsure of the condition inside the tank down around where the petcock is. I want to either buy a new tank or have it cleaned. I also hit 17,000 miles today! Also can someone point to me where the puke tube is?
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