Spark Plug is fouling up with dry Carbon - Honda ATV Forum
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post #1 of 14 (permalink) Old 08-10-2019, 06:30 AM Thread Starter
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Spark Plug is fouling up with dry Carbon

Hi everyone I am new to the forum and I am at my wits end dealing with carbon or soot deposit on the firing end of the spark plug in my 1998 Honda 300 Fourtrax, which is restricting the running of the machine. When I engage the throttle the machine bogs down and will backfire.. This issue started after installing a new Carb on the machine last summer. Everything went find on the install. I then adjusted the Carb per specification given in the manual. Everything seem to be working all right until I took a test drive when I found out something went wrong. Thing I know are:

1. I have tested or checked the spark on the tip of the spark plug and It looks pretty good to me. So the spark plug is firing.

2. I have install a new Air filter in the intake box.

3. I have checked the gap on the plug.

4. Spark plugs I am using are all new. I even tried a hotter plug, but got the same results.

What is very strange to me is that the carbon buildup on the plug happens immediately, within five minutes after starting the machine the firing end of the plug is totally black.

I can only assume that the New Carb which is an after market replacement for the original that I used is a piece of crap. Maybe I need to re-install the old OEM Carb and see what happen before moving on with this issue.

I look forward to getting any suggestions concerning this issue.
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post #2 of 14 (permalink) Old 08-10-2019, 07:09 AM
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Please post replies comments to the other thread same subject

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post #3 of 14 (permalink) Old 08-10-2019, 09:54 AM
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I deleted the other thread, please do not make more than one thread on same topic ?, this does not get you help any faster ! :-).

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post #4 of 14 (permalink) Old 08-10-2019, 09:55 AM
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ditch the china carb !!!!.
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post #5 of 14 (permalink) Old 08-10-2019, 11:53 AM
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Originally Posted by shadetree View Post
I deleted the other thread, please do not make more than one thread on same topic ?, this does not get you help any faster ! :-).
you also deleted my reply too LOL

NO Biggie
I agree ditch the china junk carb

and also, does this ATV have a snorkel on it?
how does your air filter look?
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post #6 of 14 (permalink) Old 08-10-2019, 03:46 PM
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lol killed my reply too anyway he got it.

Could be choke cable too short to seat the choke valve or bunching up at the carb

Definitely rebuild the OEM carb with new gasket kit, choke valve kit and primer plunger. you’ll be much more happy. All that will run about $100

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post #7 of 14 (permalink) Old 08-10-2019, 06:30 PM
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Quote:
Originally Posted by Goober View Post
lol killed my reply too anyway he got it.

Could be choke cable too short to seat the choke valve or bunching up at the carb

Definitely rebuild the OEM carb with new gasket kit, choke valve kit and primer plunger. you’ll be much more happy. All that will run about $100
welllllllllllll..if ya'll would notice that if more than one post is made on same topic, and one of them is in the wrong section before you post, and give us mods time to fix things ?..THEN YOUR REPLY WOULD NOT HAVE BEEN DELETED !..LOL.
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post #8 of 14 (permalink) Old 08-10-2019, 09:17 PM
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Quote:
Originally Posted by shadetree View Post
Quote:
Originally Posted by Goober View Post
lol killed my reply too anyway he got it.

Could be choke cable too short to seat the choke valve or bunching up at the carb

Definitely rebuild the OEM carb with new gasket kit, choke valve kit and primer plunger. you’ll be much more happy. All that will run about $100
welllllllllllll..if ya'll would notice that if more than one post is made on same topic, and one of them is in the wrong section before you post, and give us mods time to fix things ?..THEN YOUR REPLY WOULD NOT HAVE BEEN DELETED !..LOL.
well crap Shade, some time I don;t even look at what topic a tread is in, some times I just look at NEW POSTS and go from there, so??
maybe lock a tread first, and not be so FAST< then move it afterwards LOL
Only kidding here NO big deal to me at all, just teasing you!
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post #9 of 14 (permalink) Old 08-11-2019, 03:36 AM
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Quote:
Originally Posted by mrbb View Post
Quote:
Originally Posted by shadetree View Post
Quote:
Originally Posted by Goober View Post
lol killed my reply too anyway he got it.

Could be choke cable too short to seat the choke valve or bunching up at the carb

Definitely rebuild the OEM carb with new gasket kit, choke valve kit and primer plunger. you’ll be much more happy. All that will run about $100
welllllllllllll..if ya'll would notice that if more than one post is made on same topic, and one of them is in the wrong section before you post, and give us mods time to fix things ?..THEN YOUR REPLY WOULD NOT HAVE BEEN DELETED !..LOL.
well crap Shade, some time I don;t even look at what topic a tread is in, some times I just look at NEW POSTS and go from there, so??
maybe lock a tread first, and not be so FAST< then move it afterwards LOL
Only kidding here NO big deal to me at all, just teasing you!
lol. why lock a thread, when its gonna get deleted ?. besides, in case ya have not noticed ?, i'm not on here 24/7 ??..lol. all good bro. just pay attention to the threads and sections :-).

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #10 of 14 (permalink) Old 08-11-2019, 09:30 AM
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Quote:
Originally Posted by shadetree View Post
Quote:
Originally Posted by mrbb View Post
Quote:
Originally Posted by shadetree View Post

welllllllllllll..if ya'll would notice that if more than one post is made on same topic, and one of them is in the wrong section before you post, and give us mods time to fix things ?..THEN YOUR REPLY WOULD NOT HAVE BEEN DELETED !..LOL.
well crap Shade, some time I don;t even look at what topic a tread is in, some times I just look at NEW POSTS and go from there, so??
maybe lock a tread first, and not be so FAST< then move it afterwards LOL
Only kidding here NO big deal to me at all, just teasing you!
lol. why lock a thread, when its gonna get deleted ?. besides, in case ya have not noticed ?, i'm not on here 24/7 ??..lol. all good bro. just pay attention to the threads and sections :-).
HAHA< locking a tread means NO None can add to it before you delete it ?

NOW get back to fixing that hunting camp up and some updates LOL
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