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LegendsRacer - Legends & Bandolero Racing Forum
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back fire
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Topic: back fire (Read 6895 times)
Schmitt20
Full Member
Posts: 140
back fire
«
on:
May 03, 2010, 10:35:57 pm »
What causes the motor to back fire alot? Could it be a bad battery? At about 7,000 to 8,000 rpm it starts cutting out or popping alot, then when i let off it pops alot all the way down till 3,000 rpm.
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justfreaky
Global Moderator
Hero Member
Posts: 4520
Re: back fire
«
Reply #1 on:
May 03, 2010, 10:53:37 pm »
Not battery.
Timing, carbs, valves (need shimmed?), or hitting the rev limiter.
The backfire when you let off the gas is likely caused by raw fuel still in the pipes or header igniting from the heat.
My best guess FWIW.
Steve
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Better to be hated for who you are, Than to be loved for who you are not.
VMS Motorsports
Global Moderator
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Posts: 3524
Re: back fire
«
Reply #2 on:
May 04, 2010, 06:55:54 am »
Are you running you old carbs with your new motor?
Maybe something is set differently with the timing with the new one so you're not burning all the fuel?
Check valves, cam timing, carbs as Steve said.
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JIM BUCHER
VMS Motorsports
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justfreaky
Global Moderator
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Posts: 4520
Re: back fire
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Reply #3 on:
May 04, 2010, 08:37:35 am »
Exchanged a few pm's with him last night.
Engine was just recently rebuilt; But carbs were not.
Steve
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back fire