reknelb Posted July 6, 2020 I did my first hare scramble on the 450 yesterday in super dusty conditions. After the first hour the bike started stalling and was hard to start. I managed to finish my 2nd lap and then went back to the truck. When I got home, I saw that the air filter was really dirty. It was new before the race...lightly oiled. Has anyone else run into this during dusty conditions? OR could this be the kill switch, fuel pump filter etc? I'm going to check valve clearances today. They were dead nuts on 5hrs ago. The bike is an 18 with 50hrs. Share this post Link to post Share on other sites
yz250f 78 Posted July 6, 2020 So flip it over. Dust get through? Layer of dust in your intake boot? Pics? Share this post Link to post Share on other sites
reknelb Posted July 6, 2020 Filter stopped all the dust. Intake boot was nice and clean. I'm wondering if this is common in dusty conditions with the huge intake holes in the plastic 🤷🏼♂️. Share this post Link to post Share on other sites
yz250f 78 Posted July 6, 2020 Sure it's common. If your doin hare scrambles I'd block those holes or filter them. Motocross leave em. It's dry and dusty so just make sure your filter is thoroughly oiled. Wouldn't believe how quick dust goes through a improper oiled filter. 1 Share this post Link to post Share on other sites
reknelb Posted July 6, 2020 Valves are in spec.....the fuel filter is a little dirty. Was alot darker when wet with fuel. Changed it, I'll report back after I get to ride for more then 10min. Share this post Link to post Share on other sites
hondaxr650rrrr Posted July 7, 2020 You can get a Filterskin. Some are made with a quick pull to remove when racing. It will help keep the filter from getting clogged. 3 Share this post Link to post Share on other sites
reinigef Posted July 7, 2020 10 hours ago, hondaxr650rrrr said: You can get a Filterskin. Some are made with a quick pull to remove when racing. It will help keep the filter from getting clogged. Yep, this... Yank it off halfway through race or if bike starts running poorly. Share this post Link to post Share on other sites
reknelb Posted July 8, 2020 Ordered some filter skins and a new kill switch just in case. Looks like the previous owner filled it with glue or epoxy? Not sure if he was trying to avoid problems or was having them already with the switch. Share this post Link to post Share on other sites
reknelb Posted July 14, 2020 Just an update, raced this weekend...all good. I put a new filter w/ a filter skin on, a new fuel filter, and a new kill/map switch. Bike ran flawless. Pretty sure it was the dusty conditions and clogged air filter that caused the issues last time. 1 Share this post Link to post Share on other sites
