17-07-19, 10:49 AM
No mod required, your problems are curable with a few basic service things, I suggest. 
Fit new plugs, make sure the battery is sound and all the earth contacts clean and secure. Unscrew the plug caps from the HT leads and cut 1cm off each lead to get back to a good core. Refit the caps.
Check that the ignition switch is clean internally. Shoot it through with electrical cleaner and WD40.
What you describe on hot days isn't unusual. If you routinely use the sidestand, try parking on the centrestand to keep the carbs level. This prevents the possibility of fuel wetting the intake throats over time.
Fit new plugs, make sure the battery is sound and all the earth contacts clean and secure. Unscrew the plug caps from the HT leads and cut 1cm off each lead to get back to a good core. Refit the caps.
Check that the ignition switch is clean internally. Shoot it through with electrical cleaner and WD40.
What you describe on hot days isn't unusual. If you routinely use the sidestand, try parking on the centrestand to keep the carbs level. This prevents the possibility of fuel wetting the intake throats over time.