Revving a cold engine.

Adrian · Spanner Monkey Joined: 05 Mar 2009 Karma :

Does revving a 600cc engine when it's cold to 3000 or 4000 rpm damage it?

Thank's.
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Mystery · World Chat Champion Joined: 23 Jul 2009 Karma :

nah if you turn you choke on it should sit to about 5k my 125 sits at 5k with choke on for a few mins
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Dezeaz · Borekit Bruiser Joined: 18 May 2007 Karma :

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

More revs = more damage when cold (ie, oil possibly hasn't got all the way round, oil is thicker and all the clearances are screwy until things have got up to their operating temperature), but I wouldn't worry about 3~4k. Rule of thumb to me is treat it like it is running in and keep under half max rpm.

Choke revving it to 5K immediatly (when the oil has had no chance to get round the engine) when the engine starts is probably far worse for it.

All the best

Keith
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G · The Voice of Reason Joined: 02 Feb 2002 Karma :

windy12 · Renault 5 Driver Joined: 14 Sep 2009 Karma :

Easiest way is as close to tick over as possible without stalling the engine, wait until the engine runs nice and smoothly and the choke smoke-condensation etc stops coming out of the exhaust and the engine feels warm then go, in an ideal world.

Like others have said the rev range of bikes varies massively depending upon engine type and purpose so fairly close to tick over is a better guide.

smegballs · World Chat Champion Joined: 28 Oct 2007 Karma :

If if I choke rev to 3-4k on my 400 twin I get rewarded with plumes of blue smoke out of the head and pipe Rolling Eyes

If I'm very careful with the choke and keep it just ticking over then theres no smoke at all.....

I think I know what is best for the engine.....

Saying that thought the bike is high milage and pretty shagged....

Wafer_Thin_Ham · Super Spammer Joined: 18 Nov 2005 Karma :

3/4k will be fine on a 600cc IL 4.
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Adrian · Spanner Monkey Joined: 05 Mar 2009 Karma :

Thank you very much guys. It's all clear now.
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DAS 18/06/09 Off The Kerb Motorcycle Training. Proud owner of a Honda CG125 & a Honda Hornet