Question about 1991 Gilera RC 600 R

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Gilera Nordwest Carb setting

Hi , this is Cesar from Spain.
My bike is a Gilera Norwest 600 cc equipped with a Teikei double carb E27PV2A (same has the Yamaha XT 600 use).
The main carb is a normal round-slide carb connected to the twist grip.
Secondary carb is a vacuum type carb.

And these are the symptoms:
1- The engine starts well with the starter pulled on, but about 20 seconds later, the rpm comes down very soon and the engine stops.
(without using the starter, the engine starts quiet well if I help it a little bit with the throttle)
2- Since I can not use the starter to warm the engine, it's very difficult to keep a uniform idle until the engine gets quite warm.
3- When I'm warming the engine (throttle blows) before ride the bike, the engine rpm returns to the idle rpm more slowly than normal (some times do not return to idle for a while)
4- From about 3500-4000 rpm to full open throttle the engine runs really smoothly and powerful.

But under 3500-4000 rpm, (riding behind slow cars) the engine runs not so smoothly and a bit unstable (like jumping a little bit)
5- Also I have some back fires when close the throttle (for example, before take a curve)
And this is my problem. (Air filter is OK, spark is OK, carb float level is OK, jets are OK)
Any idea about what's going on with my carb?

One more things:
The workshop manual said that the Air screw must be turn out 1,5 turns (+/- 0,5) but other info in internet says, 3 turns (+/- 0,5) ...which is the correct setting?

Thanks in Advance for your help

Posted by on

  • cmfstone Jun 26, 2009

    Hi ginocussen,

    Thanks for your help and info!

    Tha carb has been already cleaned by me.
    I will try the paper air filter as well as an iridium spark plug.

    If possible could ou tell me how many turns out must be fixed the air screw? Thanks !



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I have a gilera RC 600 which has the same engine as the nordwest, the problem could be the carb needs to be stripped and cleaned and replace the foam air filter with a paper one. For accurate advice and spares which are quickly posted, contact BOB WRIGHT at 0044193451033. He is the official UK gilera specialist, tell him I sent you, say the guy in southern Ireland, and he will look after you. Good Luck.
PS please rate me if this helped

Posted on Jun 26, 2009

  • Gino Cussen
    Gino Cussen Jun 29, 2009

    Hi Cesar,

    If you are referring to the air mixture screw, it's 1.5 turns out from fully in position, plus or minus half a turn, depending on the atmospheric pressure. (1.5+.5 or 1.5-.5 turns)

    Good luck.



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