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Ok so i know there aren't many snowmobile guys on here but its more so an motor based problem, and their are lots of motor experts on this. So i have a 1998 polaris 488 indy super sport. Its a 2 cylinder 2 stroke motor(air cooled), no power valve system and about as basic as it gets. I got the sled not-running for free and the compression was too low to start, i wanted to keep it cheap so i put new rings in it and now the compression is back to where it should be. After the rebuild it fired right up and the first time i took it through the yard it barely had enough power to make it around. I ended up thinning out the gas mixture with the needle and clip in both carburetors, and it decided to run very well. I took it up and down the yard a few times and it ran perfectly. I had it running perfect for about 45 minutes and then i parked it. i came back a week later, i was about 10 minutes into my ride when it started bogging and running like crap again. Its hard to describe how it runs but i will attach a video to demonstrate. It is very boggy at low rpm, very little throttle response. But if you let the rpms rise and get to powerband, it sounds like it should and has good throttle response. keep in mind this is in a neutral position. it will not idle without me applying little pressure to the throttle and even then it runs boggy. When you try and drive the sled here is what happens, first it bogs down until you hit medium rpm range, then it hit power band and speeds up for about 5 seconds, then if you keep holding the throttle it bogs down until it will eventually kill. It reaches close to max rpm and powerband is decent. If you don't get it started right away it eventually floods itself, it will also not run or start with the choke on. I've ridden many of these sleds with the identical motor so i have an idea of how they are supposed to run. I'm just looking for a head start of what might be wrong so i don't throw unnecessary parts on it. here are the things i have done with it since then: Cleaned the carbs, adjusted fuel/air screw, cleaned fuel pump, new rings/seals/oil lines and filters/ spark plugs are brand new and gapped Here is what i suspect is wrong: To much gas is getting to it, reason being is i can see gas actually shoot backwards out of the carbs sometimes, wont start with choke Let me know if you need more info or you have an idea, Thank you I can’t put the video on this apparently but if you want it I can dm it*
Hey guys, I recently bought a 2001 DRZ400s with 5000 miles and I'm having some trouble jetting it properly even after buying and installing the JD jet kit. Important bits: The bike has a stock exhaust and I did the 3x3 airbox mod. Previously it had the 22.5 pilot, 162 main, and the fuel screw had been adjusted (brass removed but stock screw). With this setup it was a quick little bike, but it popped A LOT on deceleration and it missed a little on idle. Now I've installed the JD kit with 22.5 pilot, 150 main, extended screw at 2.5 turns out, and blue needle at 3rd position. Currently with this setup it feels noticeably slower but it seems to run better, if that makes sense at all. It idles well so I assume the pilot and fuel screw are adjusted properly and it doesn't pop at all now on decel, but it feels really down on power especially in the top end. When I go WOT and then back off a little it seems to accelerate a little more which leads me to believe the main jet is too SMALL, but I'm already at a 150 with stock exhaust...that said, it had a 162 and seemed more powerful. Huh. My next step is to pull the spark plug and see what it tells me, but I'm hoping someone has some input for me. Am I the only one the JD kit hasn't worked out for? Thanks, J