zamboni920 wrote:Very interested to see the results of this last mod, and also a summary of your efforts.
88gl1500..1st gear idling at 900 rpm....open the throttle and it bucks and slams the bike.
above 1200 rpm....smooth.
1st attempt...replace every vacuum hose that was weekend......no effect.
2nd pulled carbs....cleaned and polished everything squeaky cleaned....verified accelerator pump did work(kinda)........no improvement.
3rd....revisited the accelerator pump....not working so well....viewtopic.php?f=6&t=11658.....
plugged up the bypass ports and adjusted the pump lever for instant fuel delivery......Helped a bunch.75% improvement.
4th replaced accelerator pump diaphragm ($50)....a little change..more squirt but still a bit of a stumble.improved to %85
5th experimented with the slide...propped it open 3mm....dramatic change.All stumble gone.Now that I have fuel..I need a bit more air
Things I did that either didn't help or made things worse....
1st....arbitrarily bored the slow jet to a #60.
This increased the slow speed fuel to the point that the needle has to be turned in to 1 3/4 turns and also increased the fuel at the 1500 rpm range.It was now running too rich.
I had to reduce the fuel level in the bowl to compensate for a rich condition.
I changed the float to 10mm.
2nd I experimented on the slide by drilling the air port out 30% larger.It was 0.12"..I enlarged it to 0.14"..
this was a attempt to enhance throttle response.....Well it did.....Now it's just a bit touchy.
It takes very little throttle to bring the bike to 3 grand and I do mean very little.
In 3 days riding I haven't opened the throttle past 1/3 open.
It really isn't needed.Just a crack gets it to 3500 rpm in every gear easily.
3rd.unplugged the temp sensor for the CCM module.Although it changed the idle and when the valves operated(rpm),it had no benefit.
4th I decided not to replace the trigger wheel.I've read that it is suggested that that change may also require changing fuel octane.
currently I can approach a intersection and make the corner at 18 mph(still in 4th)800 rpm,roll the throttle just a little and it will pull right back to the speed limit.I never shifted.
All my problema were solved by improving the accelerator pump and opening the slide just a tad.
Now I have fuel and air at the moment I need it...Just off idle..