| Author | Message | ||
     Oldog |
Have you have ever noticed many running problems for tube frame buells are related to air leaks on the intake? Mine has had a mysterious backfire and stumble at times. This year I am replacing the intake seals and the exhaust studs I looked at the orings on the injector heads and they looked bad when you do intake seals on a FI tuber dont overlook those. it seems that the leak was to the rear cylinder and this appears to have made the front cylinder run rich. this could have been bad if it had been the other way around.. this started with a low dyno run and a confirmed overrich condition. I do have a question, there is heavy carbon in the front exhaust port and on the valve stem, will this clear up when the over rich condition on the front cylinder is corrected? | ||
| Jos51700 |
Yes. If you want proof, put it on the dyno, and run it for the first time after resolving all issues. Don't put your hand behind the exhaust, it'll be doing some sandblaster action. My S1 filled the dyno room up with black dust the first time I ran it on the dyno. Seems the bike had run really rich for a long time due to a faulty choke plunger seal, and the ports/valves, etc cleaned themselves out after the issue was resolved. A couple of quick squirts of water down the intake while running @ 2500RPM will remove the carbon also. It will dog the motor down, so you'll have to work the throttle a little, but it scrubs things out. | ||
| Dfbutler |
Don't over look downstream leaks. I developed some cracks in the headers, one fairly large one on the rear along with a broken stud all caused by too solid of a tailpipe mount, which produced similar symptoms. | ||
| Jos51700 |
Typically, an air leak in the rear exhaust, either at the flange, around the o2 sensor, or anywhere less than 8 inches from the 02 sensor, will make the bike run so rich it won't run unless WOT. |
