Following round three, which took place in Elgin last month, Ross Rutherford is currently sitting 54 points in front with Tony Craig and Craig Trew, who only have two points between them, battling for the second and third places.
In the MX1 B Class, Christopher Inglis remains top of the championship going into this weekend's round, with an 18 point gap over Lewis Dawson in second. Lee Robson is in third, currently 33 points behind Dawson.
Grant Guest took the top spot in the C class championship in the third round at Elgin, with all three race wins and maximum points. John Stewart finished the day with the second placing, with Brian Fraser not too far behind taking the third spot. Darren Smith took the fourth position.
And with everything still to ride for Scottish motocross chairman Rab Duncan is looking forward to Sunday's round at Langtonlees: "It has been a very competitive championship so far, there's no one running
away with it," he said.
Owned and run by David Macvie, the Langton Lees track has a wide range of humps, bumps and jumps, all of which are man made; including doubles, table tops, plateau jumps, drop offs, step ups, speed jumps, rollers and a whoops section, and hosted a round of the Maxxis ACU British Motocross Championship in May.
"The Langtonlees track is absolutely superb," Rab insisted. "It's perhaps a bit short of water at the moment, David tells me there hasn't been any real rain there since about April! I'm hoping for a bit of rain over night as it saves a lot of work watering.
"But it's a first class track - probably the best in Scotland. David has worked very hard on it."
With the Scottish championship in town, Rab is hoping for a good turnout. "It's very colourful, very exciting, you're right next to the action and it's very competitive," he said. "I'm hoping to see a good crowd."