what way to turn
Outstanding HDF Member
Joined: Nov 2013
Posts: 2,358
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Here's how I tuned my mixture. Idling when hot blip the throttle hard if it coughs open the mixture if it doesn't cough turn it in until it does then slowly out 1/8 or less at a time until it doesn't cough. It should at that point not pop on deceleration. Is it popping or backfiring? Did you remove the mixture screw and lose the oring? What you're describing if I'm understanding is an overly rich mixture at cruising speed. My bike did this when my mixture screw fell out. It did exactly what you're describing until I was able to get home and get it replaced. If you turn the screw in to close it should not idle it should stall out. Did you mess with anything else in the carb or just the pilot and mixture?
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Cruiser
Joined: Feb 2017
Posts: 137
Likes: 5
From: il
Ill go backward to answer; I did not mess with any thing else in the carb, this time. (had the bike 17 years, I've been in the carb) when I had the 45jet in it turning the screw in had no effect.(when I put the 44jet in, the bike would hesitate or stumble when riding at steady 15 to 25mph about 1/4 throttle the more turns in the worse it got) The bike runs fine on the road put 300plus miles on it, some befor adjusting the mixture screw just to see how it ran plugs look fine gas milage was 40 to 45 mpg, it didn't like to idle down going thru small towns and was popping loud out the exhaust. air mixture screw has not been out in 17 years so the oring should be in there, the problem I'm still having is the pipes sounding (crackeling popping backfireing) every time I decelerate, not a loud backfire that makes you jump and reach but a crackel every time.
Grand HDF Member
Joined: Apr 2007
Posts: 3,725
Likes: 3,070
From: Brighton, MI
Ill go backward to answer; I did not mess with any thing else in the carb, this time. (had the bike 17 years, I've been in the carb) when I had the 45jet in it turning the screw in had no effect.(when I put the 44jet in, the bike would hesitate or stumble when riding at steady 15 to 25mph about 1/4 throttle the more turns in the worse it got) The bike runs fine on the road put 300plus miles on it, some befor adjusting the mixture screw just to see how it ran plugs look fine gas milage was 40 to 45 mpg, it didn't like to idle down going thru small towns and was popping loud out the exhaust. air mixture screw has not been out in 17 years so the oring should be in there, the problem I'm still having is the pipes sounding (crackeling popping backfireing) every time I decelerate, not a loud backfire that makes you jump and reach but a crackel every time.
Probably just the nature of the pipes/muffler. Some are more prone than others. My cycle shacks do it and no amount of tuning eliminated it. It has been reduced by tuning and how I decelerate, but it still happens if I try...
The only other possibility is an exhaust leak at one of the connections. After a decent ride, let the pipes cool and run a clean finger around all the joints. If you get any soot on the finger, you found a leak. YD
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Cruiser
Joined: Feb 2017
Posts: 137
Likes: 5
From: il
well I think I've got it. Here is where I'm at; with the 44jet 1and7/8 turns out (more or less)on the mixture screw, started a little rich with the choke and would not take any throttle, as it warmed and I could push the choke in I could give it some throttle, then as I rode down the block with the choke pushed closed the idle was too slow not to hold the throttle open just a bit to keep it running I stop about 3 blocks from home to fill the tank and when I started from there no choke needed still a little low on rpms but not bad, I rode 127.2 miles the first 65 on the main hiway at 65 mph more or less in heavy traffic, the rest on county roads at 60 more or less when I slowed thru towns the pipes didn't pop or crackel unless I made them, and the idle was where I like it. I filled with gas at 2.709 gals and rode back all county roads 124.1 miles and filled it 2.393 gals. the idle sounds good and pipes are not sounding off when I slow down. I have not started it yet today to see if the cold start gets any better, when the 2in pipe with out baffles was on it I could pull the choke out start and ride about 1/2 a mile down the road and the more throttle I gave it the more the choke would pull in and if it wasn't warm by the time I stopped I might have to pull it out a little. any thoughts about the cold start I can live with the warm up if it stays this way but I sure liked the start and go.
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