Question about kawasaki ZXR 400 Motorcycles

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I have a 1980 z1000j model and it back fires bad,it hasent been going for 18months as we moved house now i want to continue to chase this problem i have hit the wall,i have replaced the plugs,leads,air cleaner,carbies re built,inlet,outlet manifolds replaced,diaphrams in carbies replaced and still the same issue,yesterday i started it for the first time and as you are sitting on the bike the inside right pipe was near glowing red,looking back this issue has slowly got worse,your help would be greatly appreciated

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Like all mechanical issues this is just a matter of elimination.
There is no mention of the exhaust system in the comment.

Is the motor backfiring despite the exhaust? Is there a corroded suppression baffle increasing back pressure? "... looking back this issue has slowly got worse"

There is a balance in the explosive gases, based on the comment.
So it seems the ignition chamber gases / fuel mix is correct. But there is enough fuel air ratio to post ignite, seems like an exhaust side issue from the comments.

Still there is nothing like feet on the ground ;)

Posted on Nov 19, 2013

  • 3 more comments 
  • mick melick
    mick melick Nov 19, 2013

    is there any the timing could be out???the motor itsself has never been touched

  • mick melick
    mick melick Nov 19, 2013

    ill start again,,,is there any chance the timing could be out,the motor its self has never been touched,the only think i havent changed is the coils or checked the timing .

  • Cocoa Jackson
    Cocoa Jackson Nov 20, 2013

    The assumption was the timing was set as the carb was rebuilt. Leads, coils and all the electrical circuit needs to be in top condition for the timed spark to ignite the fuel.

  • Cocoa Jackson
    Cocoa Jackson Nov 20, 2013

    The assumption was the timing was set as the carb was rebuilt. Leads, coils and all the electrical circuit needs to be in top condition for the timed spark to ignite the fuel.

  • mick melick
    mick melick Nov 22, 2013

    no ive never touched the engine at all,ive never had a cover off it,any chance the carbies wernt fixed properly???

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SOURCE: 750 89' Yamaha Virago gas & oil coming out of air cleaner

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SOURCE: Exhaust glows bright red.

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