Problems CRF 450
  • Larza
    Posts: 2
    Joined: Tue May 11, 2021 2:49 am

    Problems CRF 450

    by Larza » Tue Jun 22, 2021 12:23 am

    CRF 450R 2012 problems.
    Again back with the issues.
    Rebuilt top end (cylinder & piston).
    Valve clearence was ok at rebuild.
    New fuel pump.
    New spark plug.
    New fuel filter.
    Fresh air filter.
    Checked stator.
    Checked killswitch.
    Ran 2 tanks with injector cleaner.

    Bogs on idle if i give it quick gas.
    After a while on the trails when its hot it will sometimes die and is hard to start after, will start and run for 2 seconds then die like 3-6 times then it will start and run again.
    Sometimes when going all out on it will bog and misfire on high rpms.
    Runs like a champ sometimes.

    Valves bad? Injector? Ignition coil?
  • User avatar
    JimDirt
    Posts: 4406
    Joined: Sat Nov 25, 2006 6:31 pm

    Re: Problems CRF 450

    by JimDirt » Tue Jun 22, 2021 8:30 pm

    Hopefully Leardriver chimes in ... but Maybe injector is weak , or even a clogged vent line for the gas cap .... the other thing that comes to mind is , since you are trail riding ... maybe it might be vapor locking as the bike gets hot ... maybe some CV4 or something similar , reflective heat tape for the underside of the tank ... https://www.crfsonly.com/catalog/produc ... ts_id/3410
    2020 CRF450R
    2006 CRF450X
    Image
    Weiser , Idaho

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