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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. YFZ Powertrain
    Just thinking about what benefits I would get from a stoker crank in a 06 engine. Now I don't want to go over a 12.5:1 compression ratio and want to stay on 93 pump gas. It would be paired with a JSR tall 98mm cylinder to keep compression down. Would I have a better rod rotating angle for the...
    big bore jsr pump gas stroker
  2. YFZ450 & YFZ450R General Talk
    To start off I have a 06 Carb with a Miller ATV Ported head, 96mm 12.4:1 Wiesco Piston, barker exh, FCI and cam mod. My last dyno I had was with that new setup at it dyno at 47hp. Which I remember others saying this dyno runs about 3hp low but I feel thats not that true as I run the same as a...
    big bore piston rebuild
  3. YFZ Powertrain
    Hi first post here. 2019 YFZ450R Stage 2 hot cams HMF full exhaust Power Commander V I'm going to do a 478 Cylinder works big bore, due for a new piston so I figured what the hell. I've been looking for maps for the PC-V to accommodate the changes, I haven't had any luck finding any...
    big bore maps tuning
  4. Maintenance
    My 20
    big bore high comp power throttle body valve upgrade
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