1. 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st Cross

250-500cc Wierd Noises From Top End

Discussion in '2 Stroke' started by Bench Racer 117, Oct 10, 2012.

  1. Bench Racer 117 Husqvarna
    A Class

    Location:
    Oregon
    Husqvarna Motorcycle:
    2007 WR250
    Oops. I spelled WEIRD wrong and can't fix it. Oh well. Anyways.

    I have an 07 WR250. I recently had to ride a ton of slab to make it back to camp before running out of fuel. This meant a lot of consistent higher RPMs . It wasn't ideal and took a toll on the motor. Well after a while the motor started to have a clicking/grinding sound following what the piston was doing in unison. So we stopped and cooled them down for a little bit and then continued. It started doing it again after a few minutes but I babied it back to camp.
    The next day we rode a loop with no strange noises.
    What could the this have been? Do I need to replace the top end?

    Suggestions please.
    Bench Racer 117, Oct 10, 2012
    #1

  2. MattR 2T Forum Clerk

    Location:
    Temperance, MI
    Husqvarna Motorcycle:
    WB165, SM610
    Other Motorcycles:
    Yamaha FZ1
    Sounds like it was running lean and almost seized. It was good to stop and let it cool down. I heard people putting the choke on to richen the mixture during long high speed road runs.

    You could pull the exhaust pipe and look at the piston through the exhaust manifold. If it did seize, then you should see scoring on the piston.
    MattR, Oct 10, 2012
    #2

  3. Bench Racer 117 Husqvarna
    A Class

    Location:
    Oregon
    Husqvarna Motorcycle:
    2007 WR250
    The piston and rings look fine. No scoring. I ran fine the next day.
    Is the exhaust side more prone to show wear?
    Bench Racer 117, Oct 10, 2012
    #3

  4. rancher1 Husqvarna
    Pro Class

    Location:
    WA
    Usually yes, it runs hotter because of the exhaust and it is easy to check.
    rancher1, Oct 11, 2012
    #4

  5. Tinken Husqvarna
    Pro Class

    Location:
    Hesperia, CA
    Husqvarna Motorcycle:
    MY12 WR511
    Other Motorcycles:
    Yamaha
    Might be a good idea to pull the jug and check to make sure, check wrist pin clips. Clicking and grinding sounds are not something that I would ignore the next day...
    Tinken, Oct 11, 2012
    #5

  6. MOTORHEAD Husqvarna
    Pro Class

    Location:
    Mount Vernon, Indiana
    Husqvarna Motorcycle:
    none
    Other Motorcycles:
    2014 YAMAHA YZ250
    It may have just been "ping" from low octane as it heated up and leaned out. But, pull the pipe off and look at the exhaust side of the piston.
    MOTORHEAD, Oct 11, 2012
    #6

  7. Bench Racer 117 Husqvarna
    A Class

    Location:
    Oregon
    Husqvarna Motorcycle:
    2007 WR250
    I had to take the pipe off anyways since it's all jacked up now too. The piston and rings look great. No scoring or signs of any issues. If I were to pull the jug would it be to inspect if the clips are not in place? I'm thinking its the lean ping at this point. But should there be a reason to change the piston with the info I've given?
    Also, my friends 300 was doing the same thing. That makes me think its a lean issue and we both could have seized.
    Bench Racer 117, Oct 11, 2012
    #7

  8. MOTORHEAD Husqvarna
    Pro Class

    Location:
    Mount Vernon, Indiana
    Husqvarna Motorcycle:
    none
    Other Motorcycles:
    2014 YAMAHA YZ250
    With that I'd say richen the jetting a bit and go for it.
    MOTORHEAD, Oct 11, 2012
    #8

  9. R_Little Husqvarna
    Pro Class

    Location:
    NJ
    If it is colder out then the jetting needs to be richened.

    Was it a cold day?
    R_Little, Oct 11, 2012
    #9

  10. Bench Racer 117 Husqvarna
    A Class

    Location:
    Oregon
    Husqvarna Motorcycle:
    2007 WR250
    Frozen ground.

    Sounds like we both got lucky. Next time that happens, I'll try the choke trick.
    Bench Racer 117, Oct 11, 2012
    #10

  11. Tinken Husqvarna
    Pro Class

    Location:
    Hesperia, CA
    Husqvarna Motorcycle:
    MY12 WR511
    Other Motorcycles:
    Yamaha
    Here's a bit of trivia... What's leaner, a mixture of 35:1 or 100:1?
    Tinken, Oct 11, 2012
    #11

  12. Blakelpd5 Husqvarna
    Pro Class

    Location:
    Tigard, OR
    Husqvarna Motorcycle:
    09 WRWB165
    Other Motorcycles:
    08 CRF450R, 1980 Suzuki Wetbike
    I'll bite...

    I get confused, but recently read up on this...

    35:1 because there is less gas to air, then the 100:1


    Did i even come close?
    Blakelpd5, Oct 11, 2012
    #12
    Tinken likes this.

  13. Tinken Husqvarna
    Pro Class

    Location:
    Hesperia, CA
    Husqvarna Motorcycle:
    MY12 WR511
    Other Motorcycles:
    Yamaha
    You win a cigar. :applause:
    Tinken, Oct 11, 2012
    #13

  14. Bench Racer 117 Husqvarna
    A Class

    Location:
    Oregon
    Husqvarna Motorcycle:
    2007 WR250
    So, 205 psi. Piston looks awesome. It had to of been detonating. I'm starting to think it's fine.
    Bench Racer 117, Oct 12, 2012
    #14