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 need help with valves on a 21hp briggs v-twin

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xxXMowerdudeXxx
Monkey Wrench
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PostSubject: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeSun Mar 10, 2013 5:42 pm

we got the one cylinder just perfect, but the other one is a pain, its backfiring through the carb. we unplugged the spark plugs to make sure it is the one we think it is and its the right one if you are in front of it, we had the intake clearances all the way up to .009 from .004, it got better, but should we just keep going till it quits or do the exsust need to be messed with too, please help. we're stumped
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Thunderdivine
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeSun Mar 10, 2013 6:05 pm

Wo air filter they can anyway u tune it.
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Chopperhed
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeSun Mar 10, 2013 6:30 pm

@xxXMowerdudeXxx wrote:
we got the one cylinder just perfect, but the other one is a pain, its backfiring through the carb. we unplugged the spark plugs to make sure it is the one we think it is and its the right one if you are in front of it, we had the intake clearances all the way up to .009 from .004, it got better, but should we just keep going till it quits or do the exsust need to be messed with too, please help. we're stumped

It could be poor tuning, a bad plug or excess carbon build up on the piston and head.

Set both valves to stock, and look for other problems.
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Monkey Wrench
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeSun Mar 10, 2013 6:32 pm

it hasent ran in two years, and from what im seeing online its the carb
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Chopperhed
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeSun Mar 10, 2013 6:35 pm

@xxXMowerdudeXxx wrote:
it hasent ran in two years, and from what im seeing online its the carb

Most likely the problem.
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeSun Mar 10, 2013 6:38 pm

and most had to buy a new one, which is 100 bucks
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Chopperhed
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeSun Mar 10, 2013 6:58 pm

A good cleaning, and it should be fine. These carbs are very simple.
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xxXMowerdudeXxx
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeMon Mar 11, 2013 8:07 pm

i figured it out, its got to do with the diodes-kill wires, i pulled them off and it started to work fine

do you know where i could get some new ones, it looks like you just buy a new harnes, it also goes to the carb shutoff, then theres a plug at the other end
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Doug
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeMon Mar 11, 2013 8:10 pm

Whats wrong with your wires exactly?

By diode im assuming you mean the carb fuel solenoid. For mine instead of messing with it I just put one end to ground (already was on ground) and the other to a positive source.

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xxXMowerdudeXxx
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitimeMon Mar 11, 2013 8:59 pm

Doug Fackler wrote:
Whats wrong with your wires exactly?

By diode im assuming you mean the carb fuel solenoid. For mine instead of messing with it I just put one end to ground (already was on ground) and the other to a positive source.

the wires that come off the coil go to a diode and merge to go to the other things, the diodes are bad and they were cross talking each the causing it to backfire, i un plugged the two wires and it works perfectally fine now
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PostSubject: Re: need help with valves on a 21hp briggs v-twin    need help with valves on a 21hp briggs v-twin  Icon_minitime

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