My set-up is a Puch Magnum, E50 motor, a Treats 45mm Reed Kit and an Estoril Techno exhaust and 16x40 gearing. Pietcard CDI timing set at 15 degrees at idle, goes to 18 degrees with some throttle.
I have a VM20 carb (UNI filter) attached with an MLM Intake.
Using a 22.5 pilot and started out with a 180 main which I thought would be too rich and I'd work my way down through the main jets while tuning the carb.
The bike starts great, seems to run well - but when I check of the plug after WOT for a few minutes its white, several runs and still white - electrode looks silvery too.
Rechecked for air leaks with starter fluid and found none, double checked torque on my head bolts and checked intake/carb/filter bolts where tightened enough.
After all that and a few more runs its still running lean. Went up through jets all the way to a 220 main and the plug is still white. Engine still runs fine, and temps never go above 300f.
I've searched through the wiki and forums here and read about the vm series on other websites - no luck. Everyone else seems to be running similar setups with a 160 main (or less).... I'd be afraid my motor would seize if I even tried that. I'm obviously missing something, anyone see anything I missed or am doing wrong? Or have a suggestion on something else I can check or change.