Thinking of fitting a 25mm carby to my ducar as it only has a 19mm on it, was wondering if this will ruin my bottom end power, am only looking for better throttle response and low to mid performance, not worried about top end as much, only used as yard bike and general tooling around. Also does anyone use one of the dry K&N style air cleaners? those oily uni filters get dirty overnight in the shed. cheers