| Author | Message | ||
     Dwardo |
Would an M2 benefit from changing to a #45 pilot jet if the exhaust and airbox are stock? Or, is just drilling out the plug and setting the screw sufficient in this case. I'm planning to change my manifold seals in the near future (just in case) and want to take care of it at that time. My dealer doesn't have any jets. | ||
| Djkaplan |
I think it would be a good idea to richen the mixture, even on a stock bike. A #45 may be too rich, but maybe not if you don't shim the needle. From what I understand, even stock the mixture is on the rich side in the upper part of the rev range with a 200 mainjet, so maybe fiddling with the idle mixture screw bumping up the pilot without shimming the needle is the way to approach this. I don't know really, but someone does! | ||
| Aesquire |
Yes. Too simple? A 45 pilot will cut warm up time substantially. Idle screw set to 2 1/2 turns ( for a start ) and maybe even going to a 195 main. I can now turn the choke of in seconds, opposed to minutes before. http://www.nightrider.com/biketech/hd_cv_mods.htm Ignore advice from nightrider on changing to a different needle, the one you have is fine. DANGER, do not drill through the plug into the idle screw, you could wreck it, good luck getting that part at the local dealer. When drilling out the plug over the idle screw, drill just a little bit into the aluminum plug. Then take a self tapping metal screw, or a wood screw, & turn it into the hole in the plug ( I used pliers to hold the screw ) & pull out plug. It may even come out when drilling. Your M2 comes stock with a lean idle jet & idle screw setting for emissions purposes. Messing with this makes your bike "an off road only" machine, ( snicker, giggle )& you could be fined up to $50,000. I won't tell. The main jet is usually too rich to compensate, since they don't check emissions at full throttle, but better rich than lean. Burble beats melted pistons. Dyno tuning seems the best way to make it all close to perfect. Now would be the best time to go for engine breather mods. Getting the spew out of the carb is both cleaner and good for a whole 1 Horse power. I use a catch can, others swear by little filters. ( go catch can! rah, rah! ) See here for airbox mods. Check the knowledge vault for breather info. The stock airbox on a M2, modded as shown in the picture ( my post ) flows just as good as a wide open race hamcan, & better than a lot of aftermarket air cleaners. http://www.badweatherbikers.com/buell/messages/384 2/100876.html?1109261776 | ||
| Jackbequick |
Dwardo, I did the #45 low speed jet and 2-1/2 turns to the mixture screw mod to my M2 a couple of months after I bought it. The difference in low speed smoothness and tractability was nothing short of miraculous. And getting the engine fully warmed up was much easier. That was a five year old, very low mileage, 2000 model and I also cleaned the carb bowl did the manifold seals at the same time. But I would recommend changing the low speed jet and resetting the low speed mixture screw on any Buell or Sportster with the CV-40. They are simply too lean as delivered. Jack |
