| Author | Message | ||
     Igneroid |
Today I brought the M2 up from the basement(corner at the botom of the stairs was abitch)....Anyhow, I took it for a ride and as long as you dont get hard on the throttle, she runs like a top, but giver a handful and about 80% of the time its missing/stumbling. When it does occasionally smooth out at full throttle, it seems extremly powerfull(more than before). I have installed a new air intake(Harley Bigbore Intakes) and replaced the pilot jet with a 45 and did the 2 and a half turns on the idle mixture screw. I know its hard to diagnose a problem like this but any ideas where to start would be helpful. I replaced the intake seals when I tweeked the carb and remembered to reconnect the VOES thingy. ?????? | ||
| Crashbuell |
Does it still have the same gas in it as when you parked it? Maybe the gas got funky over the winter... | ||
| Aaomy |
igneroid did you replace the main jet yet.. you may be starving her out when you open her up.. the easier air flows threw the air filter the less vacuum is formed at the jets to pull fuel form the float bowl.. another words more air + less gas = lean mixture.. the main jet controls how much fuel you feed her at the top end. the needle threw the center of the carb hooked to the slide controls how much at mid range.. my first guess is you need a larger main if you didnt change it already. | ||
| Igneroid |
Crash- Didnt even think of that. I thought the tank was empty but there was like , a gallon in there. Ill eliminate that possiblity before I start tearin things apart. Thanks Aaomy- I read alot about jetting over at the Knowledge Vault and I didnt consider changing the main jet as the info there said the stock jet(195) was usually a little rich. My "plug reading " skills are limited but Ill check into this further. My new intake is 3 inches in diameter so mebey its leaning out.....thanks. | ||
| Jos51700 |
Aaomy +1 Mixing 2 gallons of fresh fuel should've dealt with a pretty bad single gallon of fuel. It's plug readin' time. | ||
| Phat_j |
yup, read the plugs, but it sounds as if its running lean on the big end | ||
| Igneroid |
Well, I went for a longer ride today(its sunny but colder than a bankers heart here(35 degrees farenheit) and learned a bit more about my M2's condition. Once Im past around 4500 rpm, the thing is flawlessly fast and the stumble is gone. I ran it through the gears wide open and once past 4500, the thing is very impressive. Another thing I tried, is when its stumbling/missing, I back off on the throttle a bit(just about an 8th turn), the bike actually accellerates better. Im thinkin lean but only in the mids(confused am I). Can a simple thing like an aftermarket air intake flow that much better than the breadbox to warrant this condition/main jet changes?? It has a 195 in it? Recommendations?? | ||
| Dave_02_1200 |
If the motor speeds up when you slightly roll-off the throttle, you are lean. You will either need to install a larger jet and/or to raise the needle. | ||
| Igneroid |
PROBLEM SOLVEDThanks to Dark Horse. The problem was not a lean condition but an inherant problem caused by the air intake and the CV carb. Apparently, the air flow impedes the movement of the vacume operated slide in the carb at full throttle openings. To prove this to myself, I took the filter and snorkel off and went around the block with no air breather. The bike ran smoothly/never missed a beat at full throttle but was down on power very noticably. Dark Horse beat this condition with a Mikuni, I may go the same route....} |
