Overdrive Motorsports is a full service kart shop that services the Alberta market with at-track repairs and at-shop race prep. We offer modifications, engine service/setup/rebuilds, and consulting services for competitive racers and race teams.
Joey began karting at age 9 in the Junior 1 Category at Kart Gardens International, near the Calgary Airport. He started shifter karting at age 14 in the 80cc Junior category. He opened Overdrive Motorsports in 2001.
Your video is very good and I always follow it. I have a Rotax Evo, and it's not going above 94km/h, I noticed that the valve isn't opening and closing correctly, I've already cleaned it and it's still not working. Do you think this is limiting the speed? as it reached 110km/h. What do you advise me to do? Could it be an electronic problem? Is there any electronic test that can be done? Do you have a video about this? big hug
Great video ! THANKS Small question: I manage to do a little bit and then I have to open the choke a little and then close it, to be able to do another little bit. I don't understand, the engine is jamming and I'm still playing with the screws. My air screw is about 1/4 turn and it doesn't work otherwise. Could it be the needle and how do I know that it is no longer good? I demonstrated the entire carburetor the other day, checked everything and everything looked and very clean.
Thank you for the reply, of course the factory and different dynos my read power at the crankshaft while we read at the countershaft exiting the transmission
mine isn't starting it has been left over the winter and the carb was drained but i didn't remove the jet. any tips for where to start. it cranks and doesn't turn over freely but it just doesn't start. any tips? also do you have a website because i am looking to get a basic rebuild as im getting some oily leakage from either the power valve or head gasket.
Thanks fort the comment. our website is www.odkarts.com If the engine doesn't want to start, sometimes the needle and seat in the carburetor can be stuck closed. Typically a quick dis assembly and re-assembly of the carburetor will do the trick. Try some WD40 on the inlet needle. Please make sure the battery is fully charged and holds over 8 volts when cranking.
Great video! I like how you explain things 👍🏼. Do you know what compression a Rotax max senior should run at if it is a healthy engine? And if the compression of an engine is in the healthy range does this mean that it shouldn’t need a rebuild Imminently, if it is being used by a weekend warrior like myself? Thanks, Will.
Hi Will, Historically we don't do compression tests, but you see minor performance loss at the 10 hour of use mark, then quite significant at the 30 hour mark. We do have some decent used parts if you are just trying to keep the engine running
