Please read this plug
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Road Master
Joined: Nov 2007
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From: Northeast PA
Please read this plug
Please tell me what you see....I don't like what I'm seeing on the treads...or am I wrong? When I took it out it was snug....felt like it was not too tight and not loose at all.
It's out of a Revtech 125" with about 200 miles on it. It's from the rear cylinder and it's back firing like crazy.
It's out of a Revtech 125" with about 200 miles on it. It's from the rear cylinder and it's back firing like crazy.
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Joined: Apr 2012
Posts: 2,938
Likes: 30
From: North Florida
Is that the right plug, it seem to have a lot of threads sticking into the chamber.
When is it backfiring?
Does the other look like this?
Have you checked for a vacume leak?
Carb, fuel injected, who tuned it?
When is it backfiring?
Does the other look like this?
Have you checked for a vacume leak?
Carb, fuel injected, who tuned it?
Last edited by Harleycruiser; May 30, 2015 at 08:00 AM.
Tourer
Joined: Dec 2009
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From: wisconsin
Please tell me what you see....I don't like what I'm seeing on the treads...or am I wrong? When I took it out it was snug....felt like it was not too tight and not loose at all.
It's out of a Revtech 125" with about 200 miles on it. It's from the rear cylinder and it's back firing like crazy.
It's out of a Revtech 125" with about 200 miles on it. It's from the rear cylinder and it's back firing like crazy.
Thread Starter
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Road Master
Joined: Nov 2007
Posts: 1,133
Likes: 12
From: Northeast PA
[QUOTE=Harleycruiser;14066962]Is that the right plug, it seem to have a lot of threads sticking into the chamber. Yes....it's the plug from the rear cylinder.
When is it backfiring? At deceleration and at idle sometimes.
Does the other look like this? No......to me the other looks good.
Have you checked for a vacume leak? Don't know how to do that.
Carb, fuel injected, who tuned it?[/QUOTE Carb & don't know
This May explain why I know little about it:https://www.hdforums.com/forum/off-t...swered-it.html
When is it backfiring? At deceleration and at idle sometimes.
Does the other look like this? No......to me the other looks good.
Have you checked for a vacume leak? Don't know how to do that.
Carb, fuel injected, who tuned it?[/QUOTE Carb & don't know
This May explain why I know little about it:https://www.hdforums.com/forum/off-t...swered-it.html
Outstanding HDF Member
Joined: Apr 2012
Posts: 2,938
Likes: 30
From: North Florida
No need to do a vacume check on that.
That is a de-exceleration crackle, deciple pop, not as serious as a backfire through the carb.
I see drag pipes in the other thread, this is more common with them, make sure they are tight at the head.
You might want to try a quarter-half turn out on the idle jet.
Is the backfire at idle when you give it gas or just sitting?
And is it out the carb?
That is a de-exceleration crackle, deciple pop, not as serious as a backfire through the carb.
I see drag pipes in the other thread, this is more common with them, make sure they are tight at the head.
You might want to try a quarter-half turn out on the idle jet.
Is the backfire at idle when you give it gas or just sitting?
And is it out the carb?
Last edited by Harleycruiser; May 30, 2015 at 09:57 AM.
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Thread Starter
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Road Master
Joined: Nov 2007
Posts: 1,133
Likes: 12
From: Northeast PA
No need to do a vacume check on that.
That is a de-exceleration crackle, deciple pop, not as serious as a backfire through the carb.
I see drag pipes in the other thread, this is more common with them, make sure they are tight at the head.
Ok...I'll check when I get home.
You might want to try a quarter-half turn out on the idle jet.
Would the idle jet be this
Is the backfire at idle when you give it gas or just sitting? When I give it gas.
And is it out the carb? No
That is a de-exceleration crackle, deciple pop, not as serious as a backfire through the carb.
I see drag pipes in the other thread, this is more common with them, make sure they are tight at the head.
Ok...I'll check when I get home.
You might want to try a quarter-half turn out on the idle jet.
Would the idle jet be this
Is the backfire at idle when you give it gas or just sitting? When I give it gas.
And is it out the carb? No
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