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Yamaha ATV Forum

Posts about Yamaha atv models and manufacturer specific topics.

1,537 topics in this forum

  1. yfz450 case

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    • 10,040 views
  2. yfz450 rod

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    • 1,673 views
  3. yfz450 timing

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    • 2,993 views
  4. yfz450 drive sprocket

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    • 1,602 views
  5. 2001 Yamaha Blaster wont start

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    • 15,355 views
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  6. New 2009 Yamaha Grizzly 550

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    • 18,387 views
  7. badger vs lt80

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  8. Yamaha Raptor: Simply Won't Move... 1 2

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  9. WARRIOR 350 clutch sliping 1 2 3 4

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    • 20,392 views
  10. raptor 350 shocks 1 2 3

    • 50 replies
    • 10,889 views
  11. cheap warrior stator

    • 4 replies
    • 2,312 views
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  12. Raptor 660 slipping

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    • 3,768 views
    • 0 replies
    • 15,877 views
  13. Banshee water temp?

    • 3 replies
    • 2,381 views
    • 1 reply
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    • 3 replies
    • 1,921 views
  14. 03 yam. big bear brake help

    • 7 replies
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    • 1,865 views
  15. Gilrs Rule!

    • 2 replies
    • 1,835 views
  16. Raptor Site

    • 6 replies
    • 2,634 views
  17. Non-Oil air filters

    • 5 replies
    • 1,732 views
    • 2 replies
    • 3,173 views
  18. 05 Raptor 660 Crackin And Popin

    • 5 replies
    • 3,880 views
  19. Yamaha Recalls 70,000 ATVs

    • 4 replies
    • 5,926 views
    • 5 replies
    • 2,412 views
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    • 2,990 views
  20. My son's new toy!

    • 13 replies
    • 2,704 views
  21. 2007 Grizzly 700 Details/Specs

    • 1 reply
    • 9,529 views
  22. Member Question

    • 3 replies
    • 1,518 views
  23. Warrior problems

    • 4 replies
    • 2,322 views
  24. Yamaha Parts Catalog

    • 1 reply
    • 1,719 views


  • Latest Forum Posts

    • It all sounds logical and i agree with the valve slop being a possibility, a valve seal coming off will cause the fouled plugs.  As far as compression goes i have a feeling it's a lot worse then valve slop and maybe a bent valve or something along those lines.  
    • im in agreement [email protected]  the valves shouldn't wiggle at all with or without the seals.  if that is the case, your head may be shot😥.  dont know it theres a way to fix this?  maybe jb weld?  i say its worth a shot..  but then again, i try stupid stuff like that with my stuff- dont expect it to work lol.  heads arnt cheap tho- thats gonna suck if the head is worn where the valves run through it.
    • i found out i already got covid 19 last xmas before they knew it was in the states..  brothers fam came down with a respiratory bug a month back or so and just found out they had it too..  of course theres all kinds of different strains of it but mine was just like the flu except more coughing for a week or so after i got over it..  theres wasnt as bad- just a cold really.  my grandmother (mid 80s and not in good health) just came down with it midweek of last week and got over it in 2 or 3 days using alternate meds (also how we can test if we've had it in the past).
    • Odd on the valves being loose.  Valve stem seal's only job is to keep oil from running down the stem into the chamber.  They don't hold the valves in place.  So if the valves were sloppy with the head off i'd think the guides were shot and need replacing.  That would also cause compression issues if the valves wiggle on the seat.
    • looking at the parts layout...I don't see the pickup coil being separate from the stator, which is a bummer..... I'd like to replace the pickup coil stuff as it is a little off from spec...but since it runs so well slightly warm I think I will skip it. The parts diagram lists two regulators model Y and model K1, not sure which is right for my application.

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