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Index > Engine/Drivetrain > Thread: carb info
Thread: carb info
repujeff


Revvin Up
Posts: 71
posted April 27, 2004 07:24 PM

carb info

I am finally going to get my carb rebuilt, but I would like a the carb info out of a 77 repu service manual. My friend who is doing the rebuild has the carb apart and the rebuild sheet in the kit I bought is the wrong one, although it says its for the RX4 or REPU. Also if anyone is interested in selling a 77 service manual I am ready to purchase.

       
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rotormunky


Redlining
Orlando, Florida
Posts: 424
posted April 27, 2004 09:38 PM

Does it have to be a '77?

I've got a '76 manual (tho my truck's a '77) because its the closest I could find. I can try to find time to scan in the carb section this weekend maybe.

I was lucky enough to snag a rebuilt carb off ebay for $60 about a year or so ago.


____________
-Martin
Orlando, Florida

http://www.themonkeyhouse.org/REPU

'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)

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dhood


Hauling
Posts: 134
posted April 27, 2004 10:01 PM

I've been having problems with my 77 running on only 1 rotor it seemed so I replaced everything else but the carb since that was supposed to have been rebuilt with the engine a few years ago, less than 25k miles. Nothing worked so I monkeyed around with the carb blowing out the passages and jets working with the carb on the engine, just the lid off. After that it ran pretty sweet then got gummed up again in about an hour. So off I went looking for a carb kit. None of the parts houses list a 77; hitachi up to 76 then something else for 78 on up. Could it be the 77's were built mostly with left over 76 parts? None of the tables list the kit as unavailable, but Kragen shipped me a 2 barrel kit for an 1800. My so called 77 manual as printed is a 76 with a little sticker added on with "77" typed on it. The carb section doesn't have an exploded view showing all the parts numbers and descriptions. That I had from an older carb kit. All you get in those kits anyway is a couple of float needles, idle jet and pumper cups, plus gaskets. So if I can't get a kit, I'm just going to get it boiled out and hope that does the trick. If anyone has a good air control valve rubber diapragm, I'd be interested in buying it off ya.

       
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Klaus43


Rotorhead
Posts: 1259
posted April 29, 2004 09:15 AM
Edited By: klaus42 on 29 Apr 2004 09:19

I just went thru mine...

My 'driver' was exhibiting the same '1 rotor' type of symptom, and sure enough, it was due to all the crap in the carb. Yes, those kits don't give you much, or nearly everything, but there are a few essential bits: save EVERYTHING in 'em, even if you don't need it right now! Bits for these Hitachi's aren't going to get easier to come by... (and the float bowl gasket in one of the kits I got was hard and broken, in the box...)
I think that diaphragm you're referring to is the one that opens your vacuum secondaries... Take extreme care of it, they're totally unavailable (far as I've found)-- I even tracked down a 'good' Napa part #, but there are zero of 'em anywhere, apparently. The good news: They CAN be remanufactured (!), but apparently, the company that does that won't just do one or two... We could try to round up as many as we can, and see about a 'bulk' deal...
BEWARE when wrenching on the cover! I made the mistake of trying to remove a corroded-in-place part of the fuel inlet fitting with the carb already torn down--and I boogered the cover in the process. Now it's warped, and useless... A tiny bit is all it takes to destroy it. (Wrench on the inlet fitting with the carb on the motor, you idiot, Klaus!)
Take care with those nasty solvents, guys.
PS-- David, it's all coming from the bottom of our gas tanks... I opted to install a second fuel filter at the carb, but ultimately, we all need to drain our tanks and clean 'em out... and the pick-up tube, and the fuel line, and... This is why the finest gas cap is also worth it!

       
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Klaus43


Rotorhead
Posts: 1259
posted May 03, 2004 12:21 PM

Who all is interested...

...in exact reproductions of the float bowl gasket for the ol' Hitachi's ? I think I have some ideas... we'll see if it can be economically done in the 'needed' quantity...
Base gaskets could come in handy as well...

       
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repujeff


Revvin Up
Posts: 71
posted May 09, 2004 07:08 PM

carb installed

The carb install went OK, but it didn't run quite right. The problem with hesitation from a stop was corrected, but the problem with slight backfiring in deceleration was their. I tuned up the two screws on the drivers side with rotortuners old mazda tech's method and it worked. Now everything seems to work well. Used all the gaskets in the rebuild, but nothing else as everything in the carb was ok.

       
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dhood


Hauling
Posts: 134
posted May 26, 2004 12:50 PM

Do you have a link for the rotortuner? My rebuild went ok but the fast idle is stuck around 2k and top speed is about 50 mph! I think the problem is with the secondary diaphragm, its hung up or something, have to take the carb off again. The carb kit did come with most of the gaskets and a new plunger (what squirts the accel nozzels). As it was listed as a 76 kit and I have a 77, the main difference was the fuel return setup and I also have a fast idle vacuum and two extra jets, so the kit worked fine for a 77. We thought the 77's might have been manufactured from some left over 76 parts. I would be interested in finding a way to make new rubber diaphragms for all the vacuum switches, as rubber cement only goes so far. I suppose some of the actuators are wearing out too so bushings might be in order. This is all beyond my current capabilities. As for gaskets, has anyone seen the new desktop pc driven laser cutters? Prices are $5-10 K so its outside my budget but I guess there might be more shops around that can make exact duplicates for less. Right now still cheaper to buy the kits. BTW, I had to pay $45 for my kit.

       
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repujeff


Revvin Up
Posts: 71
posted May 26, 2004 05:53 PM

carb

First I must make a correction to my last post, I used most of the gaskets that came in the rebuild kit, but nothing else as the carb didn't need anything else except a good cleaning. It works fine. dhood in searching the archives August 26, 2001 rotortuner gave info on the tuning of the carb that a old Mazda tech gave him. Also at http://www.geocities.com/mazdarx05/carby1.htm there is alot of carb info from a Australia site. Jeff

       
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Klaus43


Rotorhead
Posts: 1259
posted May 27, 2004 09:15 AM

A couple'a 'tricks' for the vacuum secondaries:

Yep, ain't those 30 year old diaphragm's a joy?
Short of going in on a group remanufacture run, (possible, I'm told!), there's a couple'a things you can try...:
1.) Solder shut the vacuum bleed-off jet. It's the one that screws in from the outside of the float bowl on the passenger side...
2.) Eliminate the spring from the vacuum secondary diaphragm housing...'take the load off'...
3.) (You can always wire the secondaries 'mechanical')...

       
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Cappella


1st Gear
Posts: 13
posted May 27, 2004 08:28 PM

Iím not sure if there was a change in Secondary Diaphragm. Last Fall I rebuilt my carb and found a Borg-Warner (Part#641345A) Secondary Diaphragm on the partsamerica website. Hope this Helps.

http://www.partsamerica.com/PartDetails.asp?SourceArea=&SourcePage=SEARCHRESULTS&MfrCode=BOR&MfrPartNumber=641345A


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1repuwannabe


1st Gear
Posts: 26
posted June 25, 2004 03:03 PM

will it work??

i know this is a little off topic only because my ride is a boinger but my trouble is that if i ease the throttle it runns great but as soon as i open the secondaries it falls on it's face and pops. my carb is a nikki 2bbl for the ford 2.0L with rod linkages. i wonder if klaus's idea will work for me just need to know where those soldier points are on my carb
____________
Hello. My name is Dale and I'm a Rotaryaholic

       
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Cappella


1st Gear
Posts: 13
posted June 25, 2004 04:51 PM

I guess you need a Secondary Diaphram for an early 80's Courier? Try the Napa Website with this part number CRB
24032. I think that one might work.

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