smelly$cat
05-12-2009, 02:50 PM
I took my 426 out this weekend for the first time in quite a while (3 mo).
I noticed it seems to be making a popping noise out of the exhaust every time it decelerates. Kind of a "Pop, pop... pop....pop pop" noise.
It also dies at idle occasionally.
I'm thinking it could be a few things.
1. Air filter might be getting dirty (i kind of doubt this would be the cause, but, open to input. I'm going to clean it as it has been a couple rides since I've done so).
2. Valve adjustment might be needed. (I haven't checked or adjusted the valves since I had the engine rebuilt ~6 rides ago) And I do notice a bit of a "tick" on the top end (more than normal) that wasn't there when I first broke in the engine. The valves were replaced with kibble whites during the rebuild.
3. I started using a bit lower octane fuel (100LL Avgas, down from 114 Trick)(Has a 12.5 to 1 CP piston in it / stock cam / stock carb). Wondering if this might require a change in jetting in my carb. Bike ran great under acceleration and I didn't noticed any funky noises or "pinging".
Anyway, these are my thoughts and the facts.
Let me know if you have any thoughts on this.
Thanks!
I noticed it seems to be making a popping noise out of the exhaust every time it decelerates. Kind of a "Pop, pop... pop....pop pop" noise.
It also dies at idle occasionally.
I'm thinking it could be a few things.
1. Air filter might be getting dirty (i kind of doubt this would be the cause, but, open to input. I'm going to clean it as it has been a couple rides since I've done so).
2. Valve adjustment might be needed. (I haven't checked or adjusted the valves since I had the engine rebuilt ~6 rides ago) And I do notice a bit of a "tick" on the top end (more than normal) that wasn't there when I first broke in the engine. The valves were replaced with kibble whites during the rebuild.
3. I started using a bit lower octane fuel (100LL Avgas, down from 114 Trick)(Has a 12.5 to 1 CP piston in it / stock cam / stock carb). Wondering if this might require a change in jetting in my carb. Bike ran great under acceleration and I didn't noticed any funky noises or "pinging".
Anyway, these are my thoughts and the facts.
Let me know if you have any thoughts on this.
Thanks!