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Author Topic: Is gas tank additive to fine tune carbs OK?  (Read 4146 times)

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Offline Johnie

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Is gas tank additive to fine tune carbs OK?
« on: August 22, 2007, 06:03:18 PM »
Just wondering if it is OK to use something like Chevron Techron or Berrymans in a tank of gas to fine tune the carbs and fuel system on my 1970 CB750. I use it on some 1980's Honda's but want to be sure I am not going to vaporize some gaskets.  Thanks again for your expertise. 
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

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Offline BobbyR

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Re: Is gas tank additive to fine tune carbs OK?
« Reply #1 on: August 24, 2007, 05:14:09 PM »
We all use that stuff. One of the favorites is Seafoam. No one reports problems.
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Offline neil young

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Re: Is gas tank additive to fine tune carbs OK?
« Reply #2 on: August 26, 2007, 12:56:51 AM »
there is a post on here somewhere with a video about Seafoam.its good stuff.
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Offline Johnie

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Re: Is gas tank additive to fine tune carbs OK?
« Reply #3 on: August 26, 2007, 06:23:55 AM »
Where do you find Seafoam?  Like WalMart?
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

tbone

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Re: Is gas tank additive to fine tune carbs OK?
« Reply #4 on: August 26, 2007, 06:32:56 AM »
Quote from: Johnie on August 26, 2007, 06:23:55 AM
Where do you find Seafoam?  Like WalMart?

Most auto parts stores sell it. Advanced, Auto Zone, NAPA, etc.
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Offline dagersh

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Re: Is gas tank additive to fine tune carbs OK?
« Reply #5 on: September 05, 2007, 11:49:27 AM »
Tractor Supply also carries it!
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1970 CB750K0
1972 CL350
1972 CB450/500 Custom
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1975 CB550F
1976 CB400F
1975 CB750 Future Restoration
1976 CB750K6
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Offline rbmgf7

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Re: Is gas tank additive to fine tune carbs OK?
« Reply #6 on: September 05, 2007, 02:04:48 PM »
Quote from: Johnie on August 26, 2007, 06:23:55 AM
Where do you find Seafoam?  Like WalMart?

'bout $6 can at wally world
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Offline Tom in Newcastle......Ontario

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Re: Is gas tank additive to fine tune carbs OK?
« Reply #7 on: November 26, 2007, 07:37:14 AM »
Car Quest........in Ontario,Canada
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Offline sandcastcb750

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Re: Is gas tank additive to fine tune carbs OK?
« Reply #8 on: November 26, 2007, 03:47:53 PM »
Only thing that fixes carbs is removing the jets and making sure the orifices are clear. Stuttering from idle is usually a clogged slow jet which works with the air screws. A good running engine should idle without a lift from the throttle. Buying new after market jets are a waste of time and usually work worse than original. Best use crysilic acid or other to eat the old gas from the jet.

I find gas additives incapable of fixing clooged jets, if that has happened.
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tbone

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Re: Is gas tank additive to fine tune carbs OK?
« Reply #9 on: November 27, 2007, 05:17:38 AM »
Although additives will not clear a total obstruction they can clear partial obstructions providing there is some flow through the jet.

I have never had a real problem with replacement jets and find them a requirement for modified engines. Even exhaust changes can require re-jetting. Variations from the stock air box, exhaust, cam, bore, pistons, etc. will change the way the motor breathes and require re-tuning/re-jetting of the carbs.

If it doesn't run right with those new after market jets, it isn't always the jets fault.
Sometimes it's the jetter's fault.  ::)
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