I've been experiencing some minor detonation since the weather has gotten hotter. (Central Texas, so it's actually HOT!) Is there anything that I can do to prevent this. I tuned the carb (Super B) when it was about 70* daily so could this be a problem since we're hitting high 90*s? Does timing need to change in warmer environments?
The bike is overall running very well but I like things to be exacto. Thanks in advance for your help.
Ok. I too run a B on my 79. And in S Texas. Couple things....and do only one at a time, look for change, if none then move to next. 1) I run ONLY premium gas (these machines were designed when gas was real.) This will increase the detonation point. 2) richen idle needle a smidge. More fuel cools the cyl walls and fights detonation. 3) retard ignition A COUPLE degrees.
This may sound a little back woodsy but which way do I need to move my plate to retard? Clock wise or counter. I don't have an adjustable timing light so I have to old school it with the plate moves X distance = 2*. I have a full tank of reg gas so I'll start with the needle and then move to the timing. By the time I rule in or out those two I'll probably need to refuel.
Of course, if I have no luck with the first two I will return everything to the initial settings and start over with the new fuel type. I've found that knowing your last known good setting is imperative when making changes.
Read thru the Ignition Timing Sticky. At the end it has a calculation of how far to turn the plate. Note that 1/16" == 5` of timing. So you need to rotate it only a very small amount. Before moving it mark the starting location with a dot of paint - bright red or "crossing guard vest" orange.