|Posted on Wednesday, July 13, 2016 - 06:13 pm: ||
Hey everyone! I heard great things about this site, so I thought Id post my question here.
I just bought a Cyclone that had some starting issues.. I got it started after cleaning out the carb and changing the gas. First off, the previous owner put a Vance and Hines exhaust on it along with a S&S Super E carb. It is not jetted as when given a quick open throttle, the bike dies out(if held there). I'm not entirely sure how one sounds normally, so I cant tell if its erratic. However it runs a lot nicer when its hot if that means anything. I just bought a high range jet kit so I could start jetting.
I also just checked the spark plugs and I was definitely in need for new ones. They were both entirely black when pulled. Which I assume means its running Rich, but with the throttle issue I could have sworn that meant lean
Another thing I noticed is after high revs, some smoke comes out of the breather tube. I'm not sure how much smoke is supposed to come out, but does it make sense the higher I rev, the more smoke comes out?
Would really appreciate the help, Thanks.. M2who
|Posted on Wednesday, July 13, 2016 - 07:31 pm: ||
Welcome. Are you warming up the bike before this quick open throttle? They do need a good warm up. I'm not familiar with the S&S carb so can't say anything about it.
Stock the bikes did not have an open breather tube. The breathers were routed into the air cleaner.
Fully warmed up, check the oil level. That means fully warmed from start to before riding, than a five minute ride. Then check the oil. It should just touch the bottom of the dip stick or no more than 1/4" up at the most. Too much oil and it'll puke out the breathers.
You should probably post this in the Old School section M2 section:
|Posted on Wednesday, July 13, 2016 - 10:37 pm: ||
That makes so much sense. The oil is inbetween the deviated cuts on the rod, I assume that's well higher then intended. I haven't changed the oil yet on this bike, I just ordered a new k&n oil filter, should be coming next week.
As for the throttle dying out, yes it does this when the engine is worm too. I haven't done this while I ride, that might be because I'm afraid of the bike popping a wheelie. But it sputs when open throttled. I'm went with the high range kit because I didn't think enough gas was getting through the needle.
|Posted on Friday, July 15, 2016 - 07:45 am: ||
Modern gas is hell on carbs when bikes sit. Heck, it's hard on carbs even when they don't sit. I don't know why, but I have a garage full of dirtbikes that give me nothing but grief.
And all your symptoms are carb symptoms.
I think that is supposed to be a good (and very expensive) carb. I'd check the sportster forums (I believe your M2 has basically sportster cams) for jetting starting points, and make sure you have a handfull of jets (usually cheap) in the range people are finding that work.
So make sure your jetting is right, but also make sure the carb is clean and working right. Unfortunately you are in a really bad spot with regards to chicken and egg. Is it running bad because the carb is still dirty but the jets are right? Or is the carb clean but the jets still not right? They can act the same. And I have had a carb I pulled, cleaned ran (badly), pulled, and cleaned again suddenly be right the second time, even though I didn't really see much difference in the second cleaning.
So patience, and start with the "community wisdom" for the carb baseline, and make sure you have all the other variables pinned down before chasing jetting.
(Or just find a stock carb on ebay, clean that, and use the community wisdom here, that I can almost repeat from memory even though I didn't have an M2 for over a decade now... 47 pilot, 190 main, and 2.5 turns out of the fuel air mixture screw? <-- double check those, that's an old memory)
|Posted on Friday, July 15, 2016 - 08:25 am: ||
Since the bike is new to you, I would consider the while thing an unknown, so would start from scratch, so to speak.
Confirm a good battery, and that the batt cables connections are clean and tight. Confirm the ignition timing is right. Make sure the ignition switch is not getting 'tired' and preventing batt voltage from getting to the coil.
Then what Reep said. With the engine off, look into the carb throat and make sure the accellerator pump is not clogged. Then go through the carb, starting with float level, and is the float needle actually shutting off the fuel?
Black plugs means not enough air or too much fuel, or both, IF everything else is as it should be.
Please let us know how it goes. And the service manual is your friend.
Hop this helps, Dave
|Posted on Wednesday, July 20, 2016 - 11:08 pm: ||
The original plugs fouled up so I bought new ones, fouled those up (black). I've bumped up 3 jet sizes from 0.0295 and they all pretty much acted the same. I'm starting to think its my accelerator pump. When I was cleaning/jetting the carb I was also playing around with the accelerator pump swivel piece on the outside. I could hear the pump pump some air. So I'm assuming its working.
Could I actually be choking my engine with too much gas? I'm getting this bogging down when I crack the throttle wide open from idle and unless I let up it will die.