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Location:
Puckapunyal
Registered:
April 2003
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 Few Small Problems
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Wed, 18 June 2003 09:03
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I have just finished spending a few hundred on the RA28 and took it for it's first big drive and 200km's into the trip the tacho went crazy (jumping) and the engine shortly after lost power and died.
I started it again and after dying a few times it kept surging but straightened itself out after about 3 minutes (i'm thinking dirty fuel) but the tacho is still jumping. As the square pin at the end of my speedo cable came loose (needs crimping again  ) the tacho is the only way I have of keeping note of my speed.
What causes a jumping tacho and what do I need to replace.
The car is a 1977 RA28 with 18RGU and twin dual throat solex's.
Also, occasionally if I am keeping it at speed for say 5 min's without changing throttle I hear something akin to a single Fart coming from the carby side of the engine (could this be blowback or preiginition?) Will a tune fix this, or should I look at carby rebuild kits (or source some webbers?? *GRIN*).
Thanks in advance...
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Location:
Gold Coast
Registered:
January 2003
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Re: Few Small Problems
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Wed, 18 June 2003 09:06
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tacho is pulsed buy the negative side of the coil which is pulsed by the ignitor. Could possible be a faulty coil/ignitor.
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Location:
Puckapunyal
Registered:
April 2003
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 Re: Few Small Problems
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Thu, 19 June 2003 01:21
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Awesome, I will get the replacement parts today at the local speed shop (if they have them, expecting them to have something this simple usually leave's me dissapointed ;0)
Any idea's on the occasional spitting from the twin-dual solex's?
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Location:
Brisbane
Registered:
May 2002
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Re: Few Small Problems
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Thu, 19 June 2003 03:26
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Mixtures and/or timing is out.
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Location:
Puckapunyal
Registered:
April 2003
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Location:
Puckapunyal
Registered:
April 2003
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 Re: Few Small Problems
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Fri, 20 June 2003 04:09
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*#^$#*!!!!!
The problem ended up being that where the cable from the external condensor connected to the outside of the distributor was loose and grotty making a poor contact. I tightened it up and jumping tacho was a thing of the past :0)
Points are burnt after only 1000km, so getting replacement condensor tonight. Thanks ppls 
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