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Location:
Hobart, TAS
Registered:
May 2002
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18R-C Carby back firing?
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Wed, 22 May 2002 11:31
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When i start my RA23/18rc motor when its cold the carby back fires alot when i try to rev it, and it also sounds like its running on three cylinders (probably coz the choke isnt working)
When it warms up it sounds and runs ok except when i accelerate from down low in any gear the carby back fires once or twice then goes ok.
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Location:
Arthurs Creek, Victoria
Registered:
May 2002
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Re: 18R-C Carby back firing?
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Wed, 22 May 2002 11:40
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Could be that it's slightly out of timing?
Would explain the backfiring and Sounding like it's running on three.
Check all your vacuum hoses, because they could be the cause of the bad timing.
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Registered:
May 2002
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Re: 18R-C Carby back firing?
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Thu, 23 May 2002 00:36
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My 18RC does that on cold days sometimes, but not when its warm.
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Re: 18R-C Carby back firing?
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Thu, 23 May 2002 02:42
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I get that all the time when it's cold too.
Im preety sure that its becuase my timing is out.
I really should get that fixed... 
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Location:
Sydney
Registered:
May 2002
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Re: 18R-C Carby back firing?
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Thu, 23 May 2002 06:11
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I get it bad too.. mostly in the cold but lately even when it's warm.. I think it's a combination of timing, vacum hoses, and it may have something to do with me bending the points last time I had the distributor cap off.. I straightened them asmuch as possible but alas... isn't it funny how we all seem to have the problem but the mighty 18r just carries on..
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Location:
Penrith
Registered:
May 2002
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Re: 18R-C Carby back firing?
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Thu, 23 May 2002 12:26
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Have you looked at the carby recently. Possibly the accelerator plunger needs replacing and the carby needs a once over. Check all the usual point gaps, leads, plugs, timing and valve clearances. If you need the specs, tell me. Try setting the timing around 10 degrees and see what happens then. Also check your idle mixture. The screw (as a rule of thumb) should be about 1 1/2 screws out. Before you change this though, count how many turns it is out so if it doesn't work you can go back to those settings. If all else fails, go to the mechanic. Also, if the air pump is connected, disconnect it, that will help.
Mark
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Location:
Hobart, TAS
Registered:
May 2002
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Re: 18R-C Carby back firing?
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Thu, 23 May 2002 13:01
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When checking the timing which groove must line up to the notch thing? theres two close together and one a few mil along, mine is in line with the one a few mil along. I think the problem is a faulty accelarator pump/fuel plunger. But anyway im fittting a 32/36 weber soon, should solve these problems and give the puss motor a bit more power!
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: 18R-C Carby back firing?
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Thu, 23 May 2002 13:48
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Looking down at the timing marks, TDC is the one on the left.
Im still unsure about what the other two close marks on the right represent.
I just adv mine as far as possible until it starts pinging, the back it off a bit.
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