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Old 02-08-2013, 07:33 PM   #1
Bogfarth OP
MOTGATT on a Yamahog
 
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Joined: Dec 2011
Location: The Northwet
Oddometer: 176
Puke Gotta quit smoking

Not me, the bike. It's a V-Star 650 Custom, 2001, with a V&H Cruzer exhaust (plus Smart Partz baffles wrapped in stove rope) and I've disconnected the AIS. Otherwise, there aren't any other mods. Until earlier this week, nary a puff came from the pipes.

At idle I get a wisp of smoke from the front pipe, the same under power, and blows a large but faintly-colored blue cloud from both pipes when I roll off. It also pops once or twice almost like a backfire every now and then. The smoke shows up regardless of engine temp, and smells a little like gas. The bike starts on full choke, which I quickly reduce down to about half. I can ride at that choke setting until it warms up (a few minutes), then shut the choke and she'll go like a rabbit. There's about a gallon of two month old gas in the tank with a half can of Seafoam in it. I pulled the plugs and compared them to an online chart (here). They've got a little oil fouling, but nothing else. The plugs have less than 50 miles on 'em.

So what have I done? In the past three weeks I've done some parking lot wobbling, shot Dri-Slide on the throttle cables, and today I cleaned the jets in both carbs. The pilot jets were just a touch gunked, while the mains were clear. Gas is a pale yellow, and has the usual reek of ethanol mix. The AIS has been disabled for quite a while, because it sounded like a popcorn machine every time I rolled off the throttle. Dri-Slide did drip from the carb face on to the front intake tappet cover. The intake boots are tight with no cracks, and the tappet O-rings are new. Either the Dri-Slide got inside the carb by running down the throttle shaft, or something else is going on...

... I just wish I knew what.
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Old 02-08-2013, 08:21 PM   #2
yukonjon
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Joined: Dec 2011
Location: Pacific Northwet, Tacoma
Oddometer: 179
Wish I could help you since I'm also a vstar rider. Anytime I have a question I usually go to the 1100 v star forum. They are great on carb questions and generally everything specific to the 1100 and 650 vstars. Check them out if you want. http://forums.delphiforums.com/n/mai...ha1100%2Fstart

By chance did you adjust your PMS screws at all when you were playing with carbs. I know backing them out a quarter turn at a time will generally eliminate the backfiring on those bikes. Even with AIS removed.
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Old 02-08-2013, 08:30 PM   #3
Bogfarth OP
MOTGATT on a Yamahog
 
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Joined: Dec 2011
Location: The Northwet
Oddometer: 176
Quote:
Originally Posted by yukonjon View Post
Wish I could help you since I'm also a vstar rider. Anytime I have a question I usually go to the 1100 v star forum. They are great on carb questions and generally everything specific to the 1100 and 650 vstars. Check them out if you want. http://forums.delphiforums.com/n/mai...ha1100%2Fstart

By chance did you adjust your PMS screws at all when you were playing with carbs. I know backing them out a quarter turn at a time will generally eliminate the backfiring on those bikes. Even with AIS removed.
Oh, duh! I completely forgot about that board! I'll copy-paste there momentarily.

Nope, I haven't goofed around with the PMS screws. They still have the cover plugs in 'em, now that I think about it.
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Old 02-10-2013, 11:14 PM   #4
yukonjon
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Joined: Dec 2011
Location: Pacific Northwet, Tacoma
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Any luck?
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Old 02-10-2013, 11:50 PM   #5
willis 2000
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Joined: Oct 2011
Location: idaho
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Adust your idle speed first. To do this properly, a synchronizing tool is required. Then, the idle mixture screws. Backfiring on decel tells something is out of adjustment, and it's considered lame.
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Old 02-11-2013, 02:43 PM   #6
Bogfarth OP
MOTGATT on a Yamahog
 
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Joined: Dec 2011
Location: The Northwet
Oddometer: 176
Quote:
Originally Posted by yukonjon View Post
Any luck?
Shorely did! Thanks for checking in on me, and the reminder about the V-Star forum! Too much Seafoam + oldish gas = cigar smoke. Added a gallon of fresh and the smoke went away, plus it no longer pops. I'm always happy when it's the little stuff!


Quote:
Originally Posted by willis 2000 View Post
Adust your idle speed first. To do this properly, a synchronizing tool is required. Then, the idle mixture screws. Backfiring on decel tells something is out of adjustment, and it's considered lame.
Mine ticks over at 12-1300rpm, which is a tad fast of average. No tools needed, either; spin the thumb-wheel and the idle speed changes. I listened to a video of an M60 shooting before setting my idle speed. The exhaust sound is just a bit faster than the gun's firing rate, so I'm in the green. The backfire-like noise only happened when I blipped it or dropped the throttle after going WOT for a moment. With fresh(er) gas, that is no longer a factor. Thanks for the help, though!
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