Join Date: Jun 2017
Location: Denver CO
Model: GL-1500A Aspencade
GL1500 Ignition Trigger Wheels
I moved from Michigan to Denver in 1981, bringing my little Honda CL-350 (my first bike) with me. In Colorado, the altitude affected the little bike severely, it was running super rich, so rich that even with it in neutral with wide-open throttle it wouldn't go past 7000 RPM (on a 10K - I think - red line). No power, just drowning in fuel. Similar situation with my '71 Impala when I first got here.
I took the carburetors apart on both and bought main jets that were 10% smaller in orifice. What a difference that made!
In addition to the carburetor adjustments somebody told me back then it is beneficial to advance ignition timing one degree from spec for every 1000 ft altitude, and I've been applying that 5 degree extra timing advance to every vehicle I've owned since I've been in Denver, with apparent improvement in fuel economy and performance.
My GL1100 is not possible to adjust the timing, but I've been reading about my new-2-me GL1500 and its ignition sys, and have found there's trigger wheels available in 4 or 6 degree from spec advance. I guess these were made primarily to correct issues with the '88 and '89 wings, but might be beneficial for "High Altitude" wings, too.
I'll be changing out the timing belts soon, and that would be the perfect time to put in a new trigger wheel. So this brings two questions:
1) Does anybody in high altitude have any experience/comment about the extra advance in a '90 to '00 GL1500?
2) When I get my nose into the belts, trigger wheel and stuff, how can you tell a factory trigger wheel from an aftermarket wheel if the PO had already put one in?