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Posted by Troll
- September 19, 2015, 09:04:44 AMQuote from: Tfrank59 on September 18, 2015, 23:00:05 PMWell, I got her back together with the baffles and back pressure now about where they should be, although I have nothing to compare it to
Actually what I've been comparing it to is my 1500 flat six Valkyrie, so the little drifter always comes up a bit short
Still for what it is I think it's running good. After I kill it when it's hot, I hear the tank vent singing trying to suck more air into the gas tank than it can or maybe it's pushing out I'm not sure--I guess when it's venting it's pushing air out? (like an angry wife) Anyways does your guys tank vent make a singing noise? Elsewise I think my desmog went OK, the bike didn't quit or anything and it seems to be running pretty good like I said...
After the bike (or any vehicle) sits on a warm day, after it's been running up to temp, the system has to deal with expansion of fuel vapor. It's called "hot soak". If it DOESN'T vent, then you have a problem. The normal 49 state system vents to the atmosphere, and also has a vacuum vent to allow air back inside the tank as fuel is consumed. If it did not do that, too, you would get a vacuum lock on the fuel tank.
Posted by CDNRatMan
- September 18, 2015, 23:29:56 PMOn a hot day when I have shut down and am rolling the bike in or out of the shed I can hear it venting, and on a hot day when I move it or stand it up it vents.
Posted by Tfrank59
- September 18, 2015, 23:00:05 PMWell, I got her back together with the baffles and back pressure now about where they should be, although I have nothing to compare it to Actually what I've been comparing it to is my 1500 flat six Valkyrie, so the little drifter always comes up a bit short Still for what it is I think it's running good. After I kill it when it's hot, I hear the tank vent singing trying to suck more air into the gas tank than it can or maybe it's pushing out I'm not sure--I guess when it's venting it's pushing air out? (like an angry wife) Anyways does your guys tank vent make a singing noise? Elsewise I think my desmog went OK, the bike didn't quit or anything and it seems to be running pretty good like I said...
Posted by gdrudd13
- September 17, 2015, 07:51:13 AMIn my quest to figure out what to remove I capped a line that should have been open, and the bike didn't run at all, so it'll be obvious.
Posted by Tfrank59
- September 16, 2015, 17:19:02 PMRight, I'm not expecting any change – at least not for the better – but if I screwed up something it'll be a change for the worse
Posted by gdrudd13
- September 16, 2015, 07:55:29 AMIf it's like mine, I doubt you'll notice a difference from it other than your bike just got about 5 lbs lighter from getting rid of all that crap.
Posted by Tfrank59
- September 16, 2015, 07:39:30 AMOK, I did the desmog per your diagram and instructions. Exhaust is off the bike being worked on, so I can't try it yet but it won't be long. I'll let you know how it runs, thanks again.
Posted by Tfrank59
- September 15, 2015, 08:25:13 AMExcellent – thank you, I'll let you know how it goes. Haven't been under my tank yet, but if I can't see a color band on the hoses I might be back.
Posted by gdrudd13
- September 15, 2015, 08:20:16 AMYellow hose at carb-This should be left open to vent
Green hose at intake-This can be capped
Blue hose at right hand of tank-This needs to stay, this is the tank vent.
Red hose on left hand side of tank-This can be capped
vacuum line- This can also be capped
This is exactly what I am running on my bike right now. All the hoses should have some sort of colored band if not, there is a diagram that I'll copy. The blue line that is being discussed is the tank vent. Run it to a place on your bike that is out of the way and you'll be fine. As for the hoses that are capped, I just used the silicon hose caps. you can buy a bunch off of Amazon for cheap. Hope this answers your question.
Posted by Tfrank59
- September 15, 2015, 08:02:34 AMI really appreciate that link, which brings up the discussion of a lot of things – especially an ongoing discussion about what to vent and what to cap off when ditching the emissions crap. I'm just afraid that without an actual diagram showing what has to happen to all the hoses (and the final result of all of your tests and revisions) that I'll screw it up and it won't even run, or maybe like with troll it'll run until the tank is half empty and then quit. You see I'm not that smart like you guys and can figure out stuff like that after-the-fact. 
Posted by gdrudd13
- September 15, 2015, 07:50:06 AMI removed all the smog stuff on my bike. Unless you have a problem with some of the components, it doesn't really do anything other than open up the tool box area on the right side of the bike. That was one of the main reasons I did it to my bike.
http://www.vulcandrifterriders.com/forum/index.php?topic=32387.msg70698#msg70698
Scroll down and you'll find the post.
Posted by LarryInSeattle
- September 13, 2015, 03:41:31 AMI am in Lynnwood. Where are you?
Posted by Tfrank59
- September 12, 2015, 22:51:05 PMQuote from: Troll on September 12, 2015, 21:30:29 PMWell right now I have quite a bit of popping on decel. Still, my exhaust back pressure isn't quite right even with baffles now in my straight pipes, so I'm going to buy some additional exhaust tips or something to help me tune my exhaust better. I believe I'm moving in the right direction on engine performance by increasing back pressure. And then once I got the exhaust where I want it, and the smog stuff is correctly removed, I can deal with rejetting the carb.Not much to doing it. All you need to do is keep an atmospheric tank and carb bowl vent. Plugging off the AIR intakes to the reed valves stops the pop on decel
Posted by greenbarn
- September 12, 2015, 21:47:45 PMThe "grampsize" mod walks you through getting rid of the additional hardware, in addition to increasing the air flow and re-jetting. You could drop the junk and leave the air box alone, if you wanted to.
Posted by Troll
- September 12, 2015, 21:30:29 PMNot much to doing it. All you need to do is keep an atmospheric tank and carb bowl vent. Plugging off the AIR intakes to the reed valves stops the pop on decel