Smerkal
Member
I would love the opportunity to compare to another FJR and if I could find one close.
I am considering the PC III option. Like I said, if I spray carb cleaner lightly right in front of the air intake or in the vicinity of the TB's (when I had the air box out) it smooths out a lot. But cranking the CO numbers way up (+50 or more) doesn't affect it much if any. I'm not sure what overall percentage of the fuel air ratio the CO trim actually translates to though.
It's hardly noticeable at warm idle, cold idle much more so until it goes into closed loop operation. I can feel it a low speeds such as idling around a parking lot, and I can hear it in the exhaust ALL the time at light loads, very noticeable driving around the neighborhood, but not imperceptable at highway speeds either. When the Staintune exhaust was on it I could really hear it. Stock exhaust at least makes it less noticeable. The clunk you mentioned happens only in conjunction with a backfire/spit out the TB, noticed that when the air box was out, but I don't hear the backfire when the air box is in place, it gets dampened. This only happens one in blue moon though (>1%) when warming up, not like it backfires constantly. Lean mixtures burn slow and can ignite the incoming charge during overlap causing a backfire out the intake. I've seen this hundreds of times tuning dirt track engines, seemed to fit the symptoms here as well.
It's not un-rideable and it goes like striped ape (will pull the front wheel without effort), it just drives me nutty. I have a habit of obsessively listening to exhaust sounds on the alert for trouble. Flying clapped out Cessna 182's for skydivers does that to you. I may just be over sensitive to an FJR thing. When I bought the bike, it was in KC, 90% of the test riding was on the interstate. I didn't even notice this until after I got it back to Nebraska (200 miles) and started commuting in town with it. Now I can't NOT notice it
I am considering the PC III option. Like I said, if I spray carb cleaner lightly right in front of the air intake or in the vicinity of the TB's (when I had the air box out) it smooths out a lot. But cranking the CO numbers way up (+50 or more) doesn't affect it much if any. I'm not sure what overall percentage of the fuel air ratio the CO trim actually translates to though.
It's hardly noticeable at warm idle, cold idle much more so until it goes into closed loop operation. I can feel it a low speeds such as idling around a parking lot, and I can hear it in the exhaust ALL the time at light loads, very noticeable driving around the neighborhood, but not imperceptable at highway speeds either. When the Staintune exhaust was on it I could really hear it. Stock exhaust at least makes it less noticeable. The clunk you mentioned happens only in conjunction with a backfire/spit out the TB, noticed that when the air box was out, but I don't hear the backfire when the air box is in place, it gets dampened. This only happens one in blue moon though (>1%) when warming up, not like it backfires constantly. Lean mixtures burn slow and can ignite the incoming charge during overlap causing a backfire out the intake. I've seen this hundreds of times tuning dirt track engines, seemed to fit the symptoms here as well.
It's not un-rideable and it goes like striped ape (will pull the front wheel without effort), it just drives me nutty. I have a habit of obsessively listening to exhaust sounds on the alert for trouble. Flying clapped out Cessna 182's for skydivers does that to you. I may just be over sensitive to an FJR thing. When I bought the bike, it was in KC, 90% of the test riding was on the interstate. I didn't even notice this until after I got it back to Nebraska (200 miles) and started commuting in town with it. Now I can't NOT notice it
