| Author | Message | ||
     Buellinator |
Help! I have a new (yes brand new) 2002 M2 Cyclone that I am breaking in. It's fitted with a full Buell race kit and pulls like a trooper. The only problem that I'm having has to do with the carb. At a steady speed of 2500-3500 rpm it seems to "hiccup" causing a miss. If I roll on the throttle, the condition goes away. I would really like to get this figured out because other than this problem, the bike runs flawlessly. Thanks in advance to all who reply. | ||
| Natexlh1000 |
If it has the race kit, it will have to be rejetted to run right. Be careful, you might be running it lean. (lean=hot hot=bad) | ||
| Jimincalif |
Yeah, it REALLY sounds too lean. Recommend STRONGLY that you re-jet both midrange and main jets bigger. What I would do at this point is switch to a Mikuni HS42 carb - it's easier to tune and works way better without an air chamber in front of it, which we all tend to ditch at the first opportunity on tubers  . If you keep running it like it is you can burn a hole in a piston. | ||
| Rerc |
Check the low speed jet, it should be at least a "45". DC. | ||
| Dennis_c |
on my 1998 S3 low speed jet 45 main 380 with race kit also you have to drill out a plug for the air mixture screw | ||
| Blake |
Main jet should be fine as evidenced by how your bike is running and much experience. Up the slow speed jet to #45 and adjust idle mixture screw to optimize idle. See service manual for more details. I think Dennis meant to say "180" main jet. Your M2 should have a 190 main jet stock I believe. | ||
| Sandblast |
Also, please verify that you are running the "new" 10R12 sparkplugs, the old ones were too hot. This is important. | ||
| Sandblast |
Ummm, guys, did the race kit change the plugs? | ||
| Buellinator |
Thanks to all who replied. I took the bike to my tuner today for some dyno time. After 4 runs, he installed a 20 thou shim under the needle, drilled the slide to 102 thou and installed a "cap" on the tapered part of the needle to eliminate some of the raw gas that was being sprayed in the carb at low speed. I should add that he races an 88 cubic inch X1 that makes 125hp at the rear wheel. Anyway, the bike now makes 80hp and 79ft/lbs of torque. This is 1hp and 4 ft/lbs better than when we started. Best of all, it now runs great! No hiccups, farting or spitting from the carb. Thanks again to everyone. |
