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reelkrzy
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Joined: Dec 17, 2009
Posts: 1
Location: palm beach fl.

PostPosted: Thu Dec 17, 2009 5:05 pm Reply with quote Back to top

Hi, i just found this forum. I've had numerous hondas in the past, but just receantly aquired a 1981 750 custom that is in nice shape. I had the carbs rebuilt but the floats are bad. Does anyone know ehere I can get these? thanks in advance for any help. Jim
 
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Californiaman
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PostPosted: Sun Dec 27, 2009 3:46 pm Reply with quote Back to top

www.bikebandit.com has new floats for $60 each!! Why do you think the floats are bad?
 
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genesound
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PostPosted: Sun Dec 27, 2009 4:38 pm Reply with quote Back to top

They're $45 ea at Service Honda. $9 minimum shipping, but that is OK if you buy several things at once.

http://xtremeusa.com/fiche_section_detail.asp?section=125043&category=MOTORCYCLES&make=HONDA&year=1981&fveh=2981

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81 CB900C, 83 CB1000C 
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rtabish
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PostPosted: Sun Dec 27, 2009 4:47 pm Reply with quote Back to top

Quote:
Why do you think the floats are bad?


because...he is reelkrzy! Laughing

the floats do go bad n these carbs, but usually not all of them. sometimes you can find whole racks of carbs for these bikes on ebay pretty cheap. might be helpful to have a parts donor anyway, for several reasons. did you get a reputable carb guy to do these? it can get pretty expensive and frustrating trying to get these carbs to work right if they are not done right the first time.

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pd750
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PostPosted: Sun Dec 27, 2009 4:54 pm Reply with quote Back to top

Welcome to the site Jim ... Smile

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gottaride
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Joined: May 28, 2008
Posts: 527
Location: Canmore, Alberta

PostPosted: Sun Dec 27, 2009 7:01 pm Reply with quote Back to top

I's need someone to back me up on this one but I recall reading somewhere on another site that carb floats if left in constant contact with gas for a long time can became gasoline permeable and thus stop working properly. The DIY repair that I recall mentions recoating the float with shellac. With the floats removed and then dipped in shellac that's a pretty easy and cheap repair...if it works.

Anyone ever tried this?

If I can find the article I`ll post it.

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81 CB900C
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gottaride
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PostPosted: Sun Dec 27, 2009 7:03 pm Reply with quote Back to top

Found it

http://www.ch250.net/techtips/15.htm

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Gottaride
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pd750
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PostPosted: Sun Dec 27, 2009 10:15 pm Reply with quote Back to top

This may be relevant .

Copied from a BMW Carb repair procedure .

Note : they are talking about carbs on the BMW R75/5 model motorcycle, produced from 1969 thru 1973, with two Bing CV (Constant Velocity?) carburetors.

Quote:
Since then alcohols have been added to gasoline and the alcohols have attacked the shellac coating protecting the plastic floats. Gasoline can get into the floats and cause them to lose buoyancy.

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Last edited by pd750 on Sun Dec 27, 2009 10:56 pm; edited 1 time in total 
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genesound
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PostPosted: Sun Dec 27, 2009 10:32 pm Reply with quote Back to top

If that was the case, I'd expect hundreds of people showing up with the same problem, and that isn't happening.

What's wrong with the floats? Did they get damaged or something? I really pretty rarely hear of bad floats in these carbs on two very active websites.

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NMT - New Member Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
81 CB900C, 83 CB1000C 
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pd750
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Joined: Aug 01, 2007
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PostPosted: Sun Dec 27, 2009 10:55 pm Reply with quote Back to top

Gene ,

It should have been noted that the floats in question were on the BMW R75/5 model motorcycle, produced from 1969 thru 1973, with two Bing CV (Constant Velocity?) carburetors.

I fixed it .

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genesound
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PostPosted: Sun Dec 27, 2009 11:21 pm Reply with quote Back to top

reelkrzy hasn't really said what the deal is, other than he had the carbs rebuilt and that the floats are bad. All this guessing is just conjecture. Laughing

At any rate, welcome to our site Jim wave

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NMT - New Member Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
81 CB900C, 83 CB1000C 
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Pointdiver
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PostPosted: Sun Dec 27, 2009 11:47 pm Reply with quote Back to top

genesound wrote:
reelkrzy hasn't really said what the deal is, other than he had the carbs rebuilt and that the floats are bad. All this guessing is just conjecture. Laughing

At any rate, welcome to our site Jim wave


yeah that Welcome!

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Pete
83 CB1100F (Blue)his
83 CB1100F (Blue)hers
80 CB750C
(sold)
81 750F w/ Wiseco 826 & 900cams


 
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gottaride
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PostPosted: Mon Dec 28, 2009 12:31 am Reply with quote Back to top

Well let's just say that long term carb float exposure to gasoline with additive alcohol is potentially problematic. Can anyone suggest an alternative float sealant lightweight enough for the job?

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Gottaride
Canmore, Alberta
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rtabish
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PostPosted: Mon Dec 28, 2009 2:18 am Reply with quote Back to top

i have been using Heet, which is isopropyl alcohol, for years without losing a float.... Bart moon

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Rob Tabish
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holysmokes
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Joined: Jul 25, 2007
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Location: ridge road springfield nova scotia

PostPosted: Mon Dec 28, 2009 8:50 am Reply with quote Back to top

old plastic floats break if you try to bend them

the 79k, has metal tangs[not OJ] on them, they are adjustable

there are many carbs which use these plastic floats

there is a list on site,somewheres ,gene posted it

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mstspot
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Joined: Sep 29, 2009
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PostPosted: Mon Dec 28, 2009 9:07 am Reply with quote Back to top

while he's gone, just chat quietly amongst yourselves.

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genesound
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Joined: Jul 24, 2007
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PostPosted: Mon Dec 28, 2009 9:21 am Reply with quote Back to top

Image

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NMT - New Member Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
81 CB900C, 83 CB1000C 
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holysmokes
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PostPosted: Mon Dec 28, 2009 9:24 am Reply with quote Back to top

thats it

gene as always comes to the rescue

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People are just as happy as they make up their
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pd750
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PostPosted: Mon Dec 28, 2009 10:13 am Reply with quote Back to top

gottaride wrote:
Well let's just say that long term carb float exposure to gasoline with additive alcohol is potentially problematic. Can anyone suggest an alternative float sealant lightweight enough for the job?


Definitely wrong .

What my previous post stated was that alcohol attacks the shellac coating on the old BMW plastic floats . As far as I know , Honda never used shellac on any floats .

The point of that post was to point out that the suggested use of shellac for float repair probably would not be a good idea .

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pd750
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PostPosted: Mon Dec 28, 2009 10:44 am Reply with quote Back to top

A suggestion for float repair :

Clean and dip the float in fuel tank sealer .

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rtabish
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PostPosted: Mon Dec 28, 2009 3:21 pm Reply with quote Back to top

what..like POR? that would change the buoyancy quite a bit, wouldn't it.

better to just get new floats, i would think.

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pd750
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PostPosted: Mon Dec 28, 2009 3:39 pm Reply with quote Back to top

I don't think it would change the buoyancy that much .

You'd be applying only a very thin coat .

I suppose the sealer could be applied only to the seams . That would cut down on the weight .

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