On the Mag 52, pull the idle screw out and see how tight the O Ring fits it. It shouldn't rattle around on it , but some do. If the engine is fairly new, Iwould contact Global hobby and send it to them for a look over. I fought my Mag 52 with bad idle for quite a while and then Global sent me a new carb. It ran really nice for about three tanks and then started acting up again. I sent the whole engine in and the did a complete turn and replaced some O rings again. While the engine was in for the last time, I found a near new OS 52 and jumped on it. I've really not had a chance to check out the Mag after it got back and thats been almost four years now.

One other thing I found out from this list was that while all Mag four stroks and some 2 strokes, use the same replacement highspeed needle valve, not all of them are the same from the factory. The 52 comes from the factory with a stubbyer taper than the big engines and the replacement needles have. The longer taper makes hitting the sweeet spot a little easier. If you have a Mag 2 stroke try swapping the high speed needle with it.

Last, if you arereally frustrated and Globalcan't help. you can always put a O.S 52/56A carb on the engineand all is good. It is abolt on replacement. The only isue you may have is if the engine was tucked tight to the motor mount, the O.S. carb may interfer with the mount. I ran across that and I just replaced the sockethead screw behindon the mount,with a flat head screw after counter sinking thehole.

The descrepency on the 70 and 90 instructionshave me wondering. I've gotmy older, Mag 70 as well asa NIB 70 from about two years back. I've also got a couple 90's, one well used and the other new ona plane. I'llcheck theidle screwson all four to see if there is any difference. Mag may have changed the carbs mid stream and not changed the manual. I'll let you know what I find tomorrow.

Don