gotta a little experience on this subject,when i can, i ride around the back of the pre 78 feild on a 75 TL250 with XL350 centre port engine,weighs a ton,flogs out pissy 33mm fork springs,well i don't jump much anyway
,but is a lot of fun which is the main point i guess, morally not really pre75, but it's the same basic bike just engineered slightly differently, i have been offered pre75 options at club level events but declined as rules are rules reguardless,(besides not as many in 78 as in 75
),and as 'all in 4 strokes" solves most expectations!