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#help #suspension #yfz450 2008 2008yfz450 2017 yamaha yfz 450r 450 450r a arms aftermarket airbox ais delete backfiring battery battery issue best coilovers big 3 big bore bog carb carb conversion chain clutch coolant crank cranks wont fire up dasa ecu efi efi tunning electric issue electrical problem engine exhaust fci fci yfz450r fourwerx fuel controller fuel injected fuel programmer full exhaust graphics gytr help help please high compression high idle hmf intake jetting leak maintainance mapping maps msd msd blaster need help nerf bars new owner no spark no start oil parts parts review pros & cons pros and cons quad racing atv rebuild rev speed rossier sand dunes shocks sprocket stalling starting starting problem stroker stroker kit throttle transmission trinity tune tune yfz450r tuning vortex vortex ecu wiring wont start yfz yfz 2015 yfz 450 2004 yfz 450 2005 yfz 450r yfz450 yfz450 help yfz450 problems yfz450 tuning yfz450r yfz450r se
  1. YFZ450 & YFZ450R General Talk
    Hey I bought a 2009 Yfz450r Like 2 weeks ago, the first day I got it it was working perfectly it starter right up and it was driving perfectly(was riding on snow) i stopped driving it for a little and like 15 min later I went to start it and it didn’t wanted to start. I realized I had a bad...
    2009 yfz450r starting problems 450 crank wont start yfz
  2. Maintenance
    I'm looking to buy a complete bottom end kit with a +4.4 stroker crank and a high compression piston for my 04 yfz. I'm new to the YFZ world and don't know if there are any additional mods I need to do besides the oil upgrade to protect my motor. If anyone could help it would be appreciated!
    bottom end crank piston
  3. YFZ450 & YFZ450R General Talk
    I’m new to the racing quad community but I have a question. Okay I’m gonna start off with I bought a 2004 (carb) YFZ450 back in April. Well I had it two days and the motor locked up. A rod went through the case and broke a whole lotta stuff. Later I ordered a 500cc big bore kit from BP racing...
    clearance crank decompression slow valve
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