Question about 1991 Gilera RC 600 R

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My gilera RC 600 COBRA doesn´t start

The electric starter move corretly the engine; but not very fast.
THe spark works fine
The motorbike has gasoline.
Tryng to start it with a car battery fire appears in the carburator and the engine made 2 or 3 explosions but doesn´start.
The engine is a 4 stroke bi-albero with 558 cc and 53 CV

What could be the problem?

Acknowledging in advance your courtesy

Jose Luis

Posted by on

  • joseluisdepa May 17, 2009

    Thanks for your help

    Valve timming looks OK all the marks are in the correct position.

    The ignition timming has the correct impedances; but i don´t know how to stablish if this timming is correct... I could buy a CDI for 160 euros and check if you are sure that this is the problem.

    Thanks for your help and advise,

    Jose Luis



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Hi Jose ,
It seems the timming may not be correct thus the back-fire.
Please check the ignition timming and valve timming too .

Hope this helps

Posted on May 15, 2009

  • Murtaza Akberali  Versi
    Murtaza Akberali Versi May 17, 2009

    Hi Jose,

    To check the igntion timming:-

    Remove the spark plugs and the valve cover, bring the piston to the TDC, you can insert something say a screw driver through the spark plug hole to check if the piston is @ TDC, check the valve to tht cylinder if they are both closed i.e. inlet & exhaust, at this stage the cylinder is on firing stroke, you should have sparks here, connect tht plug wire to the spark plug you openned making sure you earth it.

    Sparks have to be a little earlier some degrees BTDC, probabley your bike's may be a little late thus the ****** in igntion timming and thus the back fire.

    Hope this helps!



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