Remember my twin 3210 powered PK-Ripper? That is the first bike I sold to a client ($5,000 for those who want to know). Anyway, that bike was extremely wheelie prone. I flipped it once myself. I told the customer NO-ONE rides it without motocross/dirtbike experience! What does that fool do? He let his WIFE ride it! This is a supermodel level gorgeous woman who competes in "Hot Leg" contests (lucky stiff) :wink: . My phone rings one evening and it is her telling me she just got out of the emergency room with serious damage to her knees from going down on her knees on the pavement. Then she threatened to sue me! At that point I told her I ordered her husband not to let anyone ride it. I also told her "Your husband is rich, I am broke. What can you really gain by suing me anyway?" At that point she apologized and told me she would take it up with him.......
True story.
I build powerful bikes. That particular bike was very hard edged, though. It was my first performance bike. Now I know how to build bikes that are fast, but softer edged.
You are correct to lengthen the wheelbase. That and I would add weight to the front of the bike (battery packs). Adding 15ah to the nose of the bike and adding 3 inches to the wheelbase (preferably lengthening the swing arm) should reduce the wheelie tendency around 50% or so by my estimation.
Matt