Ryuichi Kiyonari concedes that his 2009 season is not going to plan as he struggles to find his best form.

The Japanese rider believes his inability to adapt to the changing conditions over race weekends has been his downfall, rather than any failings with his Ten Kate Honda bike.

He is one of only eight riders to score at least two podiums this season, but his disappointing form at the majority of the races has left him down in 11th position in the riders' standings.

The former British Superbike champion told Crash.net Radio: "My second season has been very difficult.

"Every round, every race has been very hard. Sometimes it is fine, but sometimes it is not.

"My feeling is not as good as last year, because while there were many new circuits last year, each round was better. This year is not consistent and not good enough."

Kiyonari, who scored three wins in his maiden WSB season last year, admits that his substandard form this season is down to his own mistakes.

He added: "The big problem is the rider. The machine's potential is good but I need to improve.

"My riding style is sensitive, so if the conditions change between Friday, Saturday and Sunday, it is very difficult for me to change my style. This is a problem."