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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
    so i went for a ride last night, jumped a log in second gear came down.. bike stalled.. tried to kick start it... kick starter was just locked into place at the top.. happened before... like 25 hours ago.. MY FIX was put in second gear.. walk and roll the bike to free the piston lol it worked...
    blown blown up engine maintainance repair
  2. Maintenance
    Hey all. Ive got a 2017 yfz 450 with 52 hours on it. 15 or so hours on the rebuild. I’ve got a big 3 kit on it. Ever since I got my rebuild it’s had a slight leak coming from crank case breather. I’ve changed the oil 3 times since the rebuild.( I change the oil after every trip.) Now the leak...
    engine leaks repairs
  3. Parts
    In need of parts for 05 yfz 450
    #suspension engine parts rebuild yfz450
  4. Maintenance
    Hey everyone! I have a 2018 YFZ450R SE that I bought brand new in 2018. It has a full FMF with Power Bomb head pipe, FCI Intake, and a Power Commander V. It has been giving me some serious issues the last few times at the track. Basically at Mid to higher RPMs the Engine breaks up and cuts...
    engine help mapping
  5. YFZ450 & YFZ450R General Talk
    I took my 2013 YFZ 450r to my hunting land this week where my buddies and I did some work and some riding. As we finished our ride, I noticed that my chain was sagging considerably. As we got back to camp I announced that no one would be riding my quad because the chain needed to be replaced...
    chain engine knock sprocket swingarm
  6. New Member Intros
    Hello everyone, I'm new to the blog. My name is Austin. I just bought a 2006 YFZ, guess that explains why I'm here lol. I know this post is long, so there's a TL,DR down at the bottom for those that don't want to read all of this. I've got some big plans for the quad. I want to up the cc's...
    engine plan upgrades
  7. Quad of the Month
    I have a stock 2004 YFZ450 with a HMF pipe. Bike runs great but there’s been several times where the bike will shutoff when popping a wheelie. In order for it to turn back on I have to wait like 20 min before it turns on again. You can hear the bike trying to turning like it’s about to turn on...
    2004 engine fuel programmer starting
  8. YFZ450 & YFZ450R General Talk
    So, I just bought a 2005 yfz450 for Christmas (2 weeks ago) The seller told me it was never rebuilt and that it was always riding on trails. Unfortunately for me, I was just putting around my yard and it blew my piston. When I had taken my top end off I found that my piston was in 5 pieces and...
    engine rebuild reliable worth
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