2nd Generation Specific 1986-1992 Discussion

13b sandrail exhaust question

Old 03-22-2012, 11:01 PM
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Default 13b sandrail exhaust question

I have a sandrail with a 1990 Mazda 13b n/a motor and it has 2 1/2 inch exhaust into a Y pipe to a 2 1/2 in single flow master. The rear (#2 rotor) pipe is about 2 inches longer than the other one going into the Y pipe and one is about 16 inches long, the other is 14 or so. My question is would this have any effect or noises at higher rpm's as a result? Also, the leading spark plug on the rear rotor is blackish and the other 3 are clean, what could be causing this? I forgot to mention it's carbureted with a Dellorto 48 DHLA sidedraft. Thanks in advance for any help.

Last edited by 13bbuggy; 03-22-2012 at 11:03 PM.
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Old 03-26-2012, 10:30 AM
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Default Re: 13b sandrail exhaust question

You could have an exhaust leak in it.
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Old 03-26-2012, 11:17 PM
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Default Re: 13b sandrail exhaust question

would an exhaust leak cause the spark plug to be black?
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Old 03-27-2012, 08:25 AM
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Default Re: 13b sandrail exhaust question

have you cleaned the carb?
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Old 03-27-2012, 08:30 AM
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Default Re: 13b sandrail exhaust question

with the leak i was going with the back firing you were talking in anouther post.
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Old 03-27-2012, 09:18 AM
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Default Re: 13b sandrail exhaust question

From what I understand the exhaust leak would only affect it during deceleration,and it's doing this on acceleration. I did clean the carb just the other day and replaced the fuel filter and it still does it. I shot a little video of it but every time I try to attach it to a post it gives me an error message.
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Old 04-10-2012, 01:08 PM
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Default Re: 13b sandrail exhaust question

how loud is your rail?
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