I have been 'tinkering' with this bike for about 2 years. This year I have gotten serious about it get back to 'good running' status. Last year I basically fed high concentrations of gas cleaner thru (wasted effort, I know).
History: Pushed into garage 2007, last driven (license plate) guessing 1999, Gas was left in tank/carbs from 1999 until 2007.
Obviously, I siphoned out the bad gas. I have installed new CDI ignitors, rebuilt the carbs twice this year, new spark plugs, checked spark plug wires. The bike runs, progressively better especially after the carbs through cleaning/rebuild. Today I adjusted the pilot screws, still has same issue.
It barely idles & it sounds like a 'knocking' is occuring at low rpms. Above 1500 rpms, it smooths out, runs like a champ from 2000-35 rpms. Above 3500rpms, it sputters a little bit & sometimes backfires thru muffler.
I have little better than average combustible engine knowledge, but not a mechanic & working solely from a service manual.
I can't seem to figure out why I can't get the idle to run smoothly & the exhaust are very different in temperature.
Cylinders 2/4 seem to be a very cool exhaust temperature in comparison to 1/3. The spark plugs look good (all cyl), in terms of color, no carbon.
So what does that mean when there's a distinct difference in exhaust temps? I have used used up my knowledge on what can be wrong.
Thanks for any info
History: Pushed into garage 2007, last driven (license plate) guessing 1999, Gas was left in tank/carbs from 1999 until 2007.
Obviously, I siphoned out the bad gas. I have installed new CDI ignitors, rebuilt the carbs twice this year, new spark plugs, checked spark plug wires. The bike runs, progressively better especially after the carbs through cleaning/rebuild. Today I adjusted the pilot screws, still has same issue.
It barely idles & it sounds like a 'knocking' is occuring at low rpms. Above 1500 rpms, it smooths out, runs like a champ from 2000-35 rpms. Above 3500rpms, it sputters a little bit & sometimes backfires thru muffler.
I have little better than average combustible engine knowledge, but not a mechanic & working solely from a service manual.
I can't seem to figure out why I can't get the idle to run smoothly & the exhaust are very different in temperature.
Cylinders 2/4 seem to be a very cool exhaust temperature in comparison to 1/3. The spark plugs look good (all cyl), in terms of color, no carbon.
So what does that mean when there's a distinct difference in exhaust temps? I have used used up my knowledge on what can be wrong.
Thanks for any info
