carbs on 67 Johns 100hp

rbyeab

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Jan 25, 2005
Messages
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My mechanic says I need to rebuild the carbs on my 67 100 hp (model vtl13a). He says the kit alone is $250.. I am looking for alternatives, assuming I do need to rebuild it. Is this a legit price, anywhere to get it cheaper? Can I do this myself? It would need to be fairly simple. The motor ran pretty well last fall, but now it backfires and wont start. I did not stabil the fuel. I did not run the motor out of fuel before storage.
 

fireman57

Captain
Joined
Aug 24, 2004
Messages
3,811
Re: carbs on 67 Johns 100hp

You probably do need to rebuild the carbs and you can do it yourself. check here at iboats for the carb kit price. The ones he quoted you seem awfully pricey. Get a good OEM manual and you should have no problems. If you do there a bunch of experts here (not me, I'm strictly backyard) that will come to your assistance.
 

rbyeab

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Jan 25, 2005
Messages
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Re: carbs on 67 Johns 100hp

Thanks for the response. I checked but they dont seem to stock the kit for my carb. It is too old, I guess. Any ideas where else to look?
 

R.Johnson

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Sep 24, 2003
Messages
4,446
Re: carbs on 67 Johns 100hp

That carb. is unigue to the 90, and 100 HP made in the late 60"s. It is actually 4 individual carb's in one casting. I don't know of any kit available at this time, and any part's may involve some searching. I know it has been some time since I have had one apart, at least 10 years. Back then as I recall, the needle & seats were between $20 & $30, and it takes four sets. I would advise that you have the original factory manual if you attempt this on your own. I doubt on an engine of this age if you can get the gaskets off without destroying them.
 

Tinkerer

Senior Chief Petty Officer
Joined
Mar 15, 2003
Messages
760
Re: carbs on 67 Johns 100hp

If they're just flat surface gaskets you can make them out of oil jointing / gasket paper which you can get in sheets or rolls at auto stores.
 

R.Johnson

Rear Admiral
Joined
Sep 24, 2003
Messages
4,446
Re: carbs on 67 Johns 100hp

If you have ever seen the gasket's for this carb! You may want to think again before trying to make one.
 

Tinkerer

Senior Chief Petty Officer
Joined
Mar 15, 2003
Messages
760
Re: carbs on 67 Johns 100hp

Originally posted by R.Johnson:<br /> If you have ever seen the gasket's for this carb! You may want to think again before trying to make one.
Agreed.<br /><br />I haven't seen the gasket or the carb but I had a look at the photos of the carb in a Clymer manual before posting. It'd be a long way from my favourite to make a gasket for, but if the part isn't supplied it's the only choice. I'm assuming we're talking only about flat surface gaskets as it's not clear from the photos or text how many gaskets are in it or where they are. I'm wary of Clymer describing all the steps as I've been caught before. <br /><br />If yeabs wants to pull it apart to see what the needle and seat and washers etc are like he'll have to be confident he can get or make a gasket first. <br /><br />In case yeabs wants to make one, the main tricks are:<br /><br />Either coat the face of the metal with a transfer ink and press it onto the gasket paper to get the internal shape, or put the assembly face down on the paper on a dead flat hard surface like MDF board and give the assembly a good tap with a soft faced hammer to impress the outline into the paper. Hold the assembly in place and cut around the outside with a razor knife to get the external shape, which ain't important except for appearance. Remove the assembly and cut the internal shape, which is important as if bits stick out it can interfere with fuel or air flows.<br /><br />Get a set of hole punches for the screw holes etc. No way can you get a neat hole with clean edges with drill bits etc.<br /><br />If you're lucky you'll get it right on the first attempt.
 

OBJ

Supreme Mariner
Joined
Dec 27, 2002
Messages
10,161
Re: carbs on 67 Johns 100hp

Might try the link below for parts. The last time I seen this carb was on my uncles boat years ago. Ran very well once he got it adjusted and tuned in. But what a pain!<br /><br /> http://www.twincityoutboards.com/
 
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