UK Karting - Notice Board (2-Stroke Karting) : Re: Comer C50 Problem

Notice Board (2-Stroke Karting)

Re: Comer C50 Problem - clutch????
Posted by 'itpro' on 26 Mar 2009 @ 01:59

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itproJoined: August 2001
Total Posts: 6
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The carb contains a 'needle valve'. It's held closed by a spring. When sufficient air/fuel pressure is applied to it, it will allow 'flow' to occur, then, as the pressure drops, the flow will stop.

A small hand-held pump is applied to the inlet of the carb while the carb is held in your hand. You pressurise the inlet and watch as the pressure builds up. It should then suddenly 'release' (so: STOP PUMPING!!). Note the highest pressure BEFORE it releases.

Now allow the air pressure drop and watch until the flow stops (when the gauge stops descending). Note the pressure at which it 'holds' again.

The needlevalve/spring/seals/pipe is faulty when:-

1) Presure doesn't rise
2) the pressure doesn't 'hold' at ANY level at all (ie., the pressure rises but leaks away rapidly between each 'pumping' action).
3) if the pressure NEVER reeases or releases too soon or too late
4) If the pressure doesn't drop and then rapidly STOP dropping.
5) If the results of the pressures are wildly different between repeated results.

Other will be able to tell you the 'target' blow-off pressure and the target 're-seal' pressures. (Ask Spellfame: see below!)

The device you need is this:-

http://www.spellfame.co.uk/acatalog/Comer_Tools.html

Look for Comer Carburettor Gauge (�38.59 + vat)

Ian

Message Thread:

Comer C50 Problem - clutch???? by 'barryt' (25 Mar 2009 @ 8:41)

Re: Comer C50 Problem - clutch???? by 'jakes93DAD' (25 Mar 2009 @ 8:51)

Re: Comer C50 Problem - clutch???? by 'barryt' (25 Mar 2009 @ 10:53)

Re: Comer C50 Problem - clutch???? by 'itpro' (25 Mar 2009 @ 10:54)

Re: Comer C50 Problem - clutch???? by 'barryt' (25 Mar 2009 @ 19:27)

Re: Comer C50 Problem - clutch???? by 'itpro' << You are here!

Re: Comer C50 Problem - clutch???? by 'dynamax' (26 Mar 2009 @ 11:39)

Re: Comer C50 Problem - clutch???? by 'itpro' (26 Mar 2009 @ 16:07)

Re: Comer C50 Problem - clutch???? by 'Dean900' (26 Mar 2009 @ 20:48)

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