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engine problems

  1. Loud bang and dead quad!

    Engine/EFI/Drivetrain
    I was starting my 08 and all was good. it had ran for a few minutes, i turned the idle down and a few minutes later i heard a loud bang and it quit instantly. i didn't try starting again in fear of hurting her more. any ideas as to what it was? my guess is timing chain. Any help is appreciated!
  2. Timing Chain Wear?

    Engine/EFI/Drivetrain
    So I pulled my 08 apart and saw that the outside of the chain is worn down and shiny. its also not free, as the links are sticky and dont move without a good amount of force. what could be causing the wearing? I need help guys!
  3. Air blowing into the airbox?

    Engine/EFI/Drivetrain
    I recently rebuilt my '08 LTR450 with a Big Bore Kit, and haven't started it yet. I made an attempt at it today, and... nothing. It backfires once in a while, but wont start so i checked the airbox and found that air was being pushed and pulled from it. I think this is a problem? HELP!!!! :sadwavey:
  4. Engine knock...coolant low....metal shavings in oil filter

    General Discussion
    New to the sport not much of a wrench! Bought a used 07 LTR 450, all stock, very low hours. After about 15 hrs of use, I changed the oil, oil filter, air filter, Rode for 2hrs and bang....started knocking hard. Parked it and noticed coolant coming from the overflow valve. Got it home opened the...
  5. Ltr not starting and backfiring PLEASE HELP!!

    Member Introductions
    I have an 07 and just had it rebuilt by a reliable mechanic. I took the motor out and re-installed. Its not throwing any codes, exhaust is not leaking, intake is off so i can get to the throttle body. When i crank it over it wont start and backfires threw the intake and exhaust. The machine ran...
  6. 07 Ltr 450 backfire and cutting out

    Engine/EFI/Drivetrain
    Hello Im new to this forum, Bought an 07 Ltr 450 last week, starts first time and runs ok however when I go into 3rd or 4th gear there is a big backfire ands cuts out! But then it will start up again no problem What is the problem occurring? Engnition/ecu/censor? Please help Thanks
  7. MAYDAY...MAYDAY BCS Shift Re-locator Bracket Help

    Engine/EFI/Drivetrain
    A little help needed. I put in a BCS bracket due to the shift pin boss braking (engine case). When I put the bracket in I lose shift motion up or down and will not shift through the gears. If I take the bracket out and move the gearshift lever I have full motion. I have the gearshift shaft...
  8. Valve Train Problem Yoshimura Cams..HELP

    Engine/EFI/Drivetrain
    I have a 2008 LTr 450 with the following mods done to motor..Yoshimura did the headwork(porting polishing etc)Yoshimura Exaust, Power Commander, Yoshimura Cams. The machine has been great until I installed the cams. The valves seem to come out of adjustment about every few hours of riding. I am...
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