Carburetor - buy or repair?

[duskylim]

Dear dannybe:

There are very few people I would trust to tune those Solex carbs - they really have to know what they are doing.

The people that I do know and trust are not cheap - OK ba budget mo?

When I used to have performance carbs myself (mainly twin-downs, Mikuni Kogyo Solex, Aisan and Weber downdrafts) I cleaned them with lacquer thinner.

It has no residue and will remove most of the varnish and gum in the carb.

The most important thing to remember after soaking the carb for a day in a CLOSED gallon or small drum of lacquer thinner is to DRAIN it immediately and BLOW DRY ALL PASSAGES and CHAMBERS with compressed air.

Never leave a carb with any fluid in it for a long time - corrosion and water condensate will get to it and DESTROY it.

As long as the passages are clean then its probably OK.

Note:

The reason why I used twin downs vs twin sides is very simple - twin downs are very STREETABLE - you can use them to go to work, pick up the wife and kids, and IDLE DECENTLY with the A/C ON in Metro Manila traffic.

No twin sides can do that consistently - that's why NO manufacturer used them on STANDARD vehicles - I'm NOT referring to high-end sports cars - but even they tend to use progressive down-drafts more than side drafts.

Even if you have a complete set of choke tubes, boost venturi's, jets and emulsion tubes, if the weather changes from hot, bright and sunny to cool and rainy - your twin sides will LOSE their TUNE - nothing you can do about it unless you're prepared to re-tune in the middle of the rain.

Of course that's just me - to each his own.

Good Luck and Best Regards,

Dusky Lim

P.S. Keep on tuning

[dannybe]

Hi Dusky,

If the work is worth it then i dont mind the costs just as long as they are reasonable. I dont know if all the jettings are clear though so i have to have them checked.
The carb builders will also have to tune the carbs after they are bolted on the engine so preferably within makati, mandaluyong pasig area.

what i have now are the carbs and the repair kits with a new main jet which are ready for work to be done.

thanks for the help.

[duskylim]

Dear dannybe:

Nag pm ako sa yo, please pm me back for a reply.

Regards,

Dusky Lim

[allan23]

Hi fellow tsikoteers, My problem is high idle speed. around 1500 rpm. i have a hitachi twin carb (from 1980 datsun 180B i think) installed in my nissan stanza model 85. anybody here familiar with this kind of carb? TIA

[jvnj]

Sir Duskylim,

I would like to ask your expertise on this please:

I have this Carbureted 4g63 SOHC 88 Galant. My problem is that, the Air adjust screw seems not to be working, I mean, I tried adjusting it but nothing's happening to the idling. I tried screwing it IN to the max but the idle stays, and tried to screw it OUT without removing the screw, but still nothing happens. My sparkplugs seems to be filled with black dry carbons everytime I check it (might be a sign of a too rich mixture). Also, my exhaust pipe emmits a gasoline odor.

I would like to ask your suggestions / reco if what are the possible causes and what are the things which I can check or do to fix it.

Thank you so much for your reply

[duskylim]

Dear jvnj:

Clearly you have a serious carburetor problem, you should have it dismantled and overhauled by a competent repair shop.

If you cannot adjust the mixture on curb idle and your plugs burn rich all the time, you are also wasting a lot of gas.

If you do NOT know a good shop I will recommend one but I must ask the first if they are free.

Now they are a little pricey so PM me if you're interested.

Best Regards,

Dusky Lim

[jvnj]

Sir Dusky,

Sorry for the late reply, had a very busy day at work yesterday. Anyway, thank very much you for your recommendation. You're very right about the fuel consumption, seems I'm only having about 6km a liter. By the way Sir, can you possibly tell me where the recommended shop is? I'm basically located here at Biñan Laguna, hope you can recommend a good carburetor shop somewhere here or in Las Piñas City.

Again, More Power and thank you so much for the assistance!

[duskylim]

Sir:

I myself come from Fairview here in the QC.

So sad to say the shops I'm familiar with are from QC also.

I repeat PM me if you're interested and I will call them to make an appointment for you.

Sincerely,

Dusky Lim

[ESQ]

Hi mga Sirs. Kelangan ko pong magpaoverhaul ng carburetor. San ba may magaling sa bandang sucat, paranaque at las pinas? Please naman po kasi palyado na andar ng fx ko at isa pang malaking problema eh namamatayan na pag nakaaircon. Idle ko nasa 800rpm w/o a/c, 1100rpm naman pag may aircon tapos pag nag automatic off yung compressor bumababa ng 400rpm then hirap nang makarecover. Help naman po, bago lang ako dito at di masyadong marunong sa sasakyan.

[ESQ]

Any help please? Oo nga pala, FX 7K carb gamit ko.

[Chinoi]

Dear dannybe:

I'm sorry but AFAIK there are little or no spare parts for Solex carbs, that's one of the reasons I recommend using Webers - you can still order parts for them.

Regarding Webers, FCC that is, Filipinas Chemical Corp (aka - the Funny Candy Co) used to carry all the parts.

As to Solex side drafts, try an online search for parts, and good luck. IIRC TRD (Toyota Racing development carried their parts).

BTW how were these carbs stored? Did you DRAIN the GAS from them before keeping them?

That's VERY IMPORTANT, if you did NOT do this, it's quite likely that the gas has evaporated and left a hard white crust that will block all the critical passages and DESTROY your carbs.

Open up the top and take a look at the float chamber - it its a mess in there - the carbs are pretty much gone - sorry.

Regards,

Dusky Lim

At last I found you.

Meron din ako Solex Mikuni yata. Basta meron nakasulat na Mikuni sa ibabaw at may small green gear sa tabi "choke gear " yata. Galing ito sa change engine ko na surplus 4G15 SOHC. Di ikinabit ng Mechanic kasi mas matipid daw ang yun stock carb ng EL 4g13 ko. Baka tinamad lang yun mechanic. May kasama pa nga ito exhaust manifold na may sensor na nakakabit. Gusto ko sana gamitin itong Mikuni carb at exhaust w/ sensor.

Worth ba na pa install ko ito uli dun sa 4G15 SOHC engine? Nabasa ko na may separate Idling hole ito at may Primary hole para sa low speed at secondary hole para sa high speed. Parang ang ganda ng design.

5-6km per liter pa rin FC ko after ng change engine into 4G15 SOHC. Maybe because I'm still using the Piston type carburator for 4G13.

The reason mag change engine ako kasi Loose compression at basa sa oil yun mga spark plug ko dati sa 4G13 ko.

Wala na oil yun spark plug ngayun but maitim pa rin sa carbon. But I able too adjust the Main Jet Adjustment screw at okay na kulay ng spark plug ko.

Hope you can advise me about this Mikuni Carb.ang Exhaust w/ Sensor. Sayang kasi. Thanks in Advance.

[Chinoi]

Ito pala picture ng Mikuni Carburator at Exhaust w/ sensor from 4G15 SOHC.

Sino nakakaalam ng exact model ng Mikuni Carb at saan kotse ito naka-install? Thanks.

[duskylim]

At last I found you.

Meron din ako Solex Mikuni yata. Basta meron nakasulat na Mikuni sa ibabaw at may small green gear sa tabi "choke gear " yata. Galing ito sa change engine ko na surplus 4G15 SOHC. Di ikinabit ng Mechanic kasi mas matipid daw ang yun stock carb ng EL 4g13 ko. Baka tinamad lang yun mechanic. May kasama pa nga ito exhaust manifold na may sensor na nakakabit. Gusto ko sana gamitin itong Mikuni carb at exhaust w/ sensor.

Worth ba na pa install ko ito uli dun sa 4G15 SOHC engine? Nabasa ko na may separate Idling hole ito at may Primary hole para sa low speed at secondary hole para sa high speed. Parang ang ganda ng design.

5-6km per liter pa rin FC ko after ng change engine into 4G15 SOHC. Maybe because I'm still using the Piston type carburator for 4G13.

The reason mag change engine ako kasi Loose compression at basa sa oil yun mga spark plug ko dati sa 4G13 ko.

Wala na oil yun spark plug ngayun but maitim pa rin sa carbon. But I able too adjust the Main Jet Adjustment screw at okay na kulay ng spark plug ko.

Hope you can advise me about this Mikuni Carb.ang Exhaust w/ Sensor. Sayang kasi. Thanks in Advance.

Dear Chinoy:

The carburetors I was referring to in the previous posts were SIDE-DRAFT carburetors, not the Down-Draft model that your pictures show.

Side-draft carbs are high-performance aftermarket (seldom come stock with the car) parts.

They are usually sold by high-end tuning shops like TRD (Toyota Racing Development), SpeedLab, etc., who will also install and tune them up for your.

They are very expensive, sensitive carbs and change their tune very easily with the weather.

The carburetor in your pictures are standard downdraft carbs used as OEM by the car/engine manufacturers.

I will try to give you advice on these but let me 1st say that THIS IS NOT A DO-IT-YOURSELF OPERATION.

If you do not have extensive knowledge and experience with the operation, assembly and dis-assembly, overhaul and measurement and have an sesitive ear for tuning carbs and engines then you cannot do this yourself.

It is not a skill you can pick up in a weekend.

I have previously discussed many of the basics so here are some useful threads.

http://tsikot.yehey.com/forums/showthread.php?t=70747

http://tsikot.yehey.com/forums/showthread.php?t=71419

The only adjustment you can make without opening the carbs is the curb idle fuel mixture and the curb idle and fast idle speeds.

All other adjustments, primary main, secondary main, power/enrichment and accelerator pump require you to open the carb up.

Good Luck.

Best Regards,

Dusky Lim

[Chinoi]

Sir Duskylim,

Thank you very much for the advice. Galing mo talaga mag explain. Your really a big help.

[napadpad_lang]

Im looking for a Nissan Sunny Carburetor- novice po here.. baka my marecommend kayo where to buy it.. yung authentic nissan parts naman sana.. old type pick up kasi yung samin

[RaymondUy]

Hi duskylim,

I have a Toyota Big Body '93 model with 2E Engine with an Aisin carburetor. I was not able to use the car for 8 months. When I started to use it again, it has a hard time starting. I have to pump and step on the accelerator hard and make the engine angry first before the engine becomes stable. If not, the engine will die. I also noticed that there is a smell of unburned fuel. There is no white or dark smoke coming out of the muffler. Do you think the problem is the carburetor? Can you recommend a shop or mechanic who can overhaul my carburetor? Or should I just buy a new carburetor to replace the old one. Your advice will be highly appreciated.

[duskylim]

Hi Raymond:

You should bring the car to a trusted shop and have it tuned-up and then have them look at the carburetor. If after the tune up it still runs poorly then ask them if the carb should be overhauled.

The reason I ask people to PM me when I recommend a shop is that this forum (Tsikot) frowns on advertising (that is not theirs).

So PM me if you wish me to recommend a shop.

Best Regards,

Dusky Lim

[AsyongNissan]

Sir Dusky,

Just read some of your helpful post. Looking for a carb shop near pasig or cainta. Please pm your recommendation.

My car is a 1994 Nissan lec-PS carb type 16valve maybe need some cleaning. no major jerking pero medyo hirap sa pataas lalo na pag naka aircon and i think running rich kasi may onting black smoke ( not blue or white).

Thanks

[shelu]

hope this helps. i had my nissan lec and kia cd5 carbs fixed at rommels in kamuning. butterfly in carbs is not an issue anymore these days as carb repair shops do have machine press for those butterflies. in my case, its additional 400 petot for the machining job. so far, my carb works perfectly. besides, they use timing light to ensure that the engine timing is ok and rule out blaming it on carbs. they charge 450 fort he carb overhaul excluding the gaskets and solvent.

[dlinker]

guys ask ko lng ayus lng b sa mang vsing sa may evangelista? oki b cla mag carb overhaul?