Jorge Lorenzo heads into this weekend's Assen MotoGP chasing a fifth consecutive premier class victory, which would give the Movistar Yamaha rider the championship lead for the first time this season.

Lorenzo has been on a stunning run of form, winning four straight races and dominating from the opening lap on his YZR-M1 to emerge as the biggest threat to series leader Valentino Rossi.

The gap between the Yamaha team-mates has been reduced to only a single point and on current form Lorenzo will be confident of inheriting the top spot on Saturday at the Dutch TT.

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"For a while we didn't have this bike that we have now and especially during the race our bike is very constant," Lorenzo said.

"We are able to keep a constant pace during all the race, so that is why we are winning so much and dominating on Sundays.

"Let's see what happens from now on in the future but for the moment I'm in very good shape and physically I'm stronger than ever.

"Last week I beat my trainer on a mountain bike for the first time, which I feel very proud of!

"I arrive very strong but we have to keep demonstrating it every weekend and working hard every weekend, especially for the set-up of the bike."

Lorenzo is wary of the role the weather could play this weekend but hopes the rain stays away, paving the way for a dry race on Saturday at the legendary circuit.

"This is the bad thing about the country and the race in particular. It's always the possibility for rain and always you see some clouds in the sky," he said.

"Let's see if it's not the case for this race because I think everyone prefers a dry race."

Lorenzo has had the edge over Rossi in qualifying this season, giving him an advantage in the race with the Italian conceding crucial ground on the opening laps, as was illustrated in the previous race at Catalunya where Rossi had to contend with a third row grid position.

However, Lorenzo admits it is a significant challenge each weekend to try and secure a place on the front two rows with the Ducati and Suzuki riders benefitting from the extra soft Bridgestone tyre.

"Very difficult. Our bike is not the best bike to make a single lap - it's not explosive like the Honda so we have to race a lot to make the perfect lap," he said.

"Apart from Jerez where I could make an incredible lap it is very difficult to stay on the front row.

"Sometimes we are on the second row even if I make a good lap because sometimes we have the disadvantage of the tyre and you have some riders in front [using the extra soft].

"Anyway, we are getting the front row or second row to start well for Sunday."