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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. Maintenance
    2008 YFZ450, completely stock. Does this sound like normal engine sound or do my valves need to be adjusted? This bike was neglected in storage for a few years but I had it tuned up a couple months ago at a shop, (carb clean & rejetting, oil change, etc). It was running great afterwards but...
    knocking rattle top end valve
  2. 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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