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  1. Maintenance/Repairs/Tuning
    I have an LTZ400 with an Athena 435 big bore kit and Hot Cams. I’ve done everything to this motor except for the simple DRZ gasket mod to bump up my compression. My question is I have everything apart and the base gasket split and I’m measuring each layer of thickness. My understanding is the...
  2. LT-Z400
    So my z smokes when under acceleration, from what I've been reading that's a dead giveaway that the rings are bad. NOW, where I'm finding inconsistencies is how to go about fixing it. Should I send my cylinder off to get bored out to 434 and re plated, do I just give her a quick hone, slap a...
  3. LT-Z400
    Hi everyone I am new on here and a new z400 owner. I am building a z400 for my son to race in NYC for 2022 season. I was wanting to know 1st of the cylinder has BDFAG stamped on the right side of the cylinder I was wondering if it may be a big bore cylinder? I don't want to take the off lead off...
  4. Maintenance/Repairs/Tuning
    Hey guys, new here. I purchased an '03 ltz 400 with a broken exhaust valve an the atv was in pieces. I replaced the exhaust valve with a shindy valve and discovered this quad has the cot cams #47, #48 with adjustable sprocket. So after reading half the the threads on here(thank you) I was able...
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