I had a 7amp fitted by the dealer to my peugeot kisbee 50 gy6 that i owned last year as the 4 amp had no back bone and as you say it really helps with cranking power especialy a must in them minus temps in deep winter, when my agility battery starts to weaken i will be getting a 7amp, is your 7amp a gel battery i was told the one i had fitted was a gel battery they normaly fit to the honda cbr125 as that one was the only one they had in stock that would fit as it was only slightly larger.....