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Reasoning on an old RMK
Q I have a 2003 Polaris 800 RMK with porting, polishing, reeds, an SLP pipe, NOS and clutching. When I jump or ride deep powder it starts blubbering. I can get it to stop most times by hitting the NOS. I rebuilt the carbs and did a temp sensor and just really trued my crank and put in a fresh top-end and it still does it! I built a box for around the exhaust so it can’t plug with snow and the 40mm flat slide rack carbs are bored. I also checked the TPS and it was in spec. Any suggestions? – Cory Rahnasto
A The most common cause for this would be the seal between the silencer outlet and the bellypan. We recommend running a bead of ultra-black high temperature silicone around the end of the silencer outlet prior to slipping it into place. Where this one is already installed, I would turn the sled up on its side and seal it from the bottom side. The reason this is an issue is that when you dive into deep powder, the snow will cover or partially cover the exhaust outlet. Raw exhaust will then follow the edge of the silencer back up into the under-hood area if there is not a good seal on the outlet. This exhaust will then be sucked back into the engine through the drain holes or other gaps in the air box making the sled run rich (there is little oxygen in exhaust air). If the sled is set up on the rich side on jetting, the problem will be even more pronounced. I would recommend you check the piston wash and jet it so it has about 1/8- to ¼-inch of piston wash extending from the edge toward the center of the piston at the intake transfer ports. Also, if you have a partially fouled plug, a bad cap or sparkplug wires, these would aggravate the problem. Finally, I would be interested to see what kind of box you built around the exhaust outlet. The stock snow deflector on his sled did a fine job of keeping it from plugging in powdery snow conditions. Feel free to give me a call or send me a picture of the box and the exhaust outlet. -
Jerry Mathews, Starting Line Products