21-09-22, 06:06 AM
(09-09-22, 04:41 PM)Falcon 269 link Wrote: My five pennyworth.
Ignition advancers are worth fitting but, in my experience, won't come close to restoring what you've lost from not having a working EXUP.
There's no carb mod/tuning solution that will do it, either.
Black Widow headers are no different than the stock headers minus EXUP. Your results/opinion may vary ...
Take your time and scour ebay/breakers etc for the EXUP valve components. Early model R1 valves are identical, so search for old R1 exhausts and scavenge what you need from one of them.
:agree
Yep, refit the EXUP, no brainer. You can still fit a 4* advancer, which will smooth out the power delivery low and mid range, it's not huge but there, fuel consumption will improve slightly as will starting.
Yamaha an many others retard the ignition for the reason pointed out by Grahamm.
(09-09-22, 11:50 PM)Grahamm link Wrote: The reason the ignition is not usually advanced is that bikes have to be made to run on the crappy fuel that's used in some countries (often because it's been adulterated to save a few pennies). This means that it's best to retard the spark to give the best possible chances of a clean ignition.
UK fuel is good quality, so the spark can be advanced to give more power, but it's still burning the same amount of fuel, just at a slightly earlier point in the piston's travel.
Later