lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Gas Yamaha
Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles



Post New Thread  Reply
 
Thread Tools Display Modes
Old 08-13-2018, 01:20 PM   #1
OgreTX
Gone Wild
 
OgreTX's Avatar
Yamaha
 
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
Talking Calling all G-1 Folks - Carburetors

I feel like I am being forced to finish a project I undertook almost a year ago. It concerns the continuing advice on our stock "Mikuni" carbs (pics 1,2,&3) and the Chinese knockoff "Mokini" carbs (pic4). Please excuse the blurred pics. I tried to take them all with the "up-close" camera setting.

I agree with the advice that the cheap knock offs are hit & miss. I have had luck with some, and not so much with others. So "pays your money and takes your chance." What interested me most was the thought that there might be some good pieces of the knockoffs that would help me overhaul and clean up my original Mikuni.

First my background and limitations: I am by NO means an expert. I first encountered disassembling carbs when I did a few GM QuadraJets for a couple of '72 Pontiacs I am working on (pic 5). So if you ask me a technical question, I may not have a very good answer, but I'll try. I'm just like y'all ... and old guy who love tinkering with things to see how they work, and see if I can make them work a little better.

I'll try to get some good pics and update this thread as frequently as I can.

Ogre
Attached Images
File Type: jpg IMG_1398.jpg (85.3 KB, 0 views)
File Type: jpg IMG_1399.jpg (108.0 KB, 0 views)
File Type: jpg IMG_1400.jpg (75.7 KB, 0 views)
File Type: jpg IMG_1334.jpg (87.4 KB, 0 views)
File Type: jpg IMG_0251.JPG (74.8 KB, 0 views)
OgreTX is offline   Reply With Quote
Alt Today
BGW

Golf car forum Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum
   
Old 08-13-2018, 01:32 PM   #2
OgreTX
Gone Wild
 
OgreTX's Avatar
Yamaha
 
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
Default Re: Calling all G-1 Folks - Carburetors

Right quick, while I'm thinking about it. In the stickies above, sontag1 has an excellent post on fixing his throttle shaft leakage.

This reminded me of the universal problem with QuadraJets. The throttle shaft wears and air leaks in around the shaft and makes it almost impossible to get the fuel-air mixture right, so the old QJs are usually considered junk. They can be overhauled and tuned up pretty good, IMHO.

Ogre
Attached Images
File Type: jpg IMG_0309.JPG (67.7 KB, 0 views)
File Type: jpg IMG_0310.JPG (69.6 KB, 0 views)
OgreTX is offline   Reply With Quote
Old 08-14-2018, 07:51 AM   #3
JerEazy
Getting Wild
 
Join Date: Aug 2018
Posts: 146
Default Re: Calling all G-1 Folks - Carburetors

UGGGhhhhh the Qjet.... one of the best carbs when tuned right. Was way ahead of it's time technologically speaking. But you needed a **** PhD to properly tune it.

I like where your head is at. I would assume the jets, nozzles, floats, needles and such would interchange.
JerEazy is offline   Reply With Quote
Old 08-14-2018, 12:30 PM   #4
OgreTX
Gone Wild
 
OgreTX's Avatar
Yamaha
 
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
Default Re: Calling all G-1 Folks - Carburetors

Quote:
Originally Posted by JerEazy View Post
UGGGhhhhh the Qjet.... one of the best carbs when tuned right. Was way ahead of it's time technologically speaking. But you needed a **** PhD to properly tune it.

I like where your head is at. I would assume the jets, nozzles, floats, needles and such would interchange.
That's what I am thinking too. I've got them both apart, and I will post some pics of the differences/similar parts that might be interchangeable so that the original Mikuni can be used. I already know the main nozzle (from the fuel bowl to the carb) for getting the right fuel via the venture effect, is SIGNIFICANTLY different. Not being a fluid dynamics expert, I am not sure what the eventual effect will be.

I'll try to get 'er done this PM.

BTW, the guy who wrote the book on QJs, Cliff Ruggles, is on the Pontiac forum I call home, and we had frequent conversations while I was rebuilding the two I did. Here's his book: https://images-na.ssl-images-amazon....4,203,200_.jpg

Ogre
Attached Images
File Type: jpg IMG_0984.jpg (62.5 KB, 0 views)
File Type: jpg IMG_0985.jpg (66.8 KB, 0 views)
OgreTX is offline   Reply With Quote
Old 08-14-2018, 01:15 PM   #5
OgreTX
Gone Wild
 
OgreTX's Avatar
Yamaha
 
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
Default Re: Calling all G-1 Folks - Carburetors

For anybody following this thread, I should have posted the page from the G-1 AM3 repair manual which provides the nomenclature I will be using. It's below.

I know that I am not that good with the correct names, so this is where I will be getting the names of the parts.

Ogre
Attached Files
File Type: pdf G-1 AM3.pdf (51.4 KB, 0 views)
OgreTX is offline   Reply With Quote
Old 08-14-2018, 04:36 PM   #6
OgreTX
Gone Wild
 
OgreTX's Avatar
Yamaha
 
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
Default Re: Calling all G-1 Folks - Carburetors

Ok, Next installment.

The first noticeable difference between the two carbs side-by-side is the opening from the carb to the engine (pic 1). Pic 2 shows the beefier opening on the knock off, and pic 3 is the Yamaha Mikuni. Because the outside diameter is the same for mounting to the carb boot at the cylinder, the inside is smaller on the knock off. The throttle shaft has been removed form the el cheapo.

Pic 4 and 5 show the difference in the two throttle shafts. Interestingly, the brass butterfly valve will fit on the knock off shaft. If your shaft is worn, you may want to use the knock off shaft. Use caution with the screws. The repair manual says that they have been designed so they won't come loose and flow into the piston. They will come loose ... be patient.

Ogre
Attached Images
File Type: jpg IMG_1320.jpg (108.1 KB, 0 views)
File Type: jpg IMG_1321.jpg (86.4 KB, 0 views)
File Type: jpg IMG_1323.jpg (82.0 KB, 0 views)
File Type: jpg IMG_1324.jpg (114.7 KB, 0 views)
File Type: jpg IMG_1328.jpg (73.3 KB, 0 views)
OgreTX is offline   Reply With Quote
Old 08-14-2018, 04:47 PM   #7
griffo002
Gone Wild
Yamaha
 
Join Date: Aug 2018
Location: Down under
Posts: 180
Default Re: Calling all G-1 Folks - Carburetors

Thx for posting ....I am in the middle of doing up a G1.....I have picked up a el cheapo china made carb (can't get a original for love or money in Oz).Crank seals and top end rebuild kit + reeds are on the way.
So if this replacement carb is a failure i will follow your lead from this thread.
Again thanks.
Griff.
griffo002 is offline   Reply With Quote
Old 08-14-2018, 04:59 PM   #8
OgreTX
Gone Wild
 
OgreTX's Avatar
Yamaha
 
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
Default Re: Calling all G-1 Folks - Carburetors

Quote:
Originally Posted by griffo002 View Post
Thx for posting ....I am in the middle of doing up a G1.....I have picked up a el cheapo china made carb (can't get a original for love or money in Oz).Crank seals and top end rebuild kit + reeds are on the way.
So if this replacement carb is a failure i will follow your lead from this thread.
Again thanks.
Griff.
No sweat, Griff. I'll get to the bottom (fuel bowl) next. While I hope this will help folks keep their original, I think it might be worth buying a couple of knock offs, and getting the best parts to maybe make one decent aftermarket carb too.

Ogre
OgreTX is offline   Reply With Quote
Old 08-14-2018, 06:22 PM   #9
Spicyunicorn
Gone Wild
Yamaha
 
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
Default Re: Calling all G-1 Folks - Carburetors

Another helpful thing is sometimes the shaft and the bushing are both worn I have used the plastic bushing in el cheapos in the original carb
Spicyunicorn is offline   Reply With Quote
Old 08-14-2018, 07:04 PM   #10
mikeasis
Gone Wild
Yamaha
 
Join Date: Jan 2017
Location: venice
Posts: 1,767
Default Re: Calling all G-1 Folks - Carburetors

Good stuff here!
mikeasis is offline   Reply With Quote
Reply
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Gas Yamaha


Thread Tools
Display Modes


Similar Threads
Thread Forum
Cleaning Carburetors Garage and Workshop
Tillotson Diaphragm Carburetors Clone Engine Swaps
Aftermarket carburetors Gas Yamaha
Ezgo carburetors (3) Golf Carts and Parts
ezgo carburetors Gas EZGO


All times are GMT -5. The time now is 12:33 PM.


Club Car Electric | EZGO Electric | Lifted Golf Carts | Gas EZGO | Used Golf Carts and Parts

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
This Website and forum is the property of Buggiesgonewild.com. No material may be taken or duplicated in part or full without prior written consent of the owners of buggiesgonewild.com. 2006-2017 Buggiesgonewild.com. All rights reserved.