Hi I am thinking about mounting this little 4 stroke on the rear of my bike.. might be able to use the existing rack..??...I have a small sprocket on the 1/2" shaft there is a small centrifugal clutch I have a 9 and a 10 tooth small sprocket. If I just run a chain from the small eng sprocket to the rear wheel sprocket, will this work.. or do I need jackshafts?.. (not familiar with those)....I dont expect this little 26cc eng to pull me from a dead stop, but by pedalling till I got some speed then the clutch would engage.. My question is; is the ratio gonna work?... it is like the usual "China girl" sprocket ratios... any advice?