Fuel mix issue or no?

[Peder_y2k]

'88 VR starts quick, idles perfectly smooth, hot restarts are perfect, throttle response is quick.

 

When fully warmed and parked on the centerstand in neutral, briefly holding throttle at 3500 RPM, engine exhaust crackles and pops. With a quick spinup from idle to 5000 RPM there are no issues, simply normal quick smooth engine response.

 

When normal riding two up at any speed, there are no issues of the pop and crackle evidenced at the no-load 3500 RPM. Only time it crackles is under no-load conditions with the throttle held open. No crackling below 3000 RPM or above 4500 RPM. Plugs are clean, correct tan color.

 

Is this an issue? IMHO this is not an issue, but would be if the crackling exhaust happened under normal riding conditions.

 

-Pete, in Tacoma WA USA

[Prairiehammer]

'88 VR starts quick, idles perfectly smooth, hot restarts are perfect, throttle response is quick.

 

When fully warmed and parked on the centerstand in neutral, briefly holding throttle at 3500 RPM, engine exhaust crackles and pops. With a quick spinup from idle to 5000 RPM there are no issues, simply normal quick smooth engine response.

 

When normal riding two up at any speed, there are no issues of the pop and crackle evidenced at the no-load 3500 RPM. Only time it crackles is under no-load conditions with the throttle held open. No crackling below 3000 RPM or above 4500 RPM. Plugs are clean, correct tan color.

 

Is this an issue? IMHO this is not an issue, but would be if the crackling exhaust happened under normal riding conditions.

 

-Pete, in Tacoma WA USA

 

I agree, if the bike performs well when ridden then there is no problem.

[flyday58]

Just curious, do you have the Ignitech TCI? I just learned about this "wasted spark" thing and wonder if the plug firing on the exhaust stroke is catching some unburned gas in that rpm range. Maybe I'm way off, but still wondering...

[Peder_y2k]

No Ignitech, just the standard OEM TCI system. Carbs synched, and excellent uniform compression.

-Pete, in Tacoma WA USA

[cowpuc]

Check the plug caps, run it in the dark and look for leaks on wires - sounds like it might me electrical to me too..

Hey Pete,, hows the exhaust system - pin holes will make all kind of not a problem poppin and crackin noises..