11-01-2020, 12:45 AM | #1 |
Not Yet Wild
Join Date: Jul 2019
Location: Bay Area, CA
Posts: 15
|
VC625 starting and running issues
New member and I recently installed a VC625 in my 1988 Yamaha G2. Install went fine, but it runs terribly. I read the Carb Tuning FAQ on Vegas Carts website and it wasn’t much help.
The issues are:
What I’ve done so far:
I’ve dug through a bunch of the older threads trying to find answers and found some different approaches. I was hoping based on my described symptoms yall could tell me which direction to take. Carburetor Tuning: Carb tuning is definitely not my forte, but I’m comfortable messing with it with a little direction. It sounds like user Shepard is a whiz with these carbs so hopefully he reads this and can help. I’m willing to buy parts to throw at the carb, but I’m a little hesitant to have to drill/tap anything and would like to avoid that if possible. Fuel return line: A few threads mentioned installing a return line to the fuel tank solved similar issues. Also, the use of an electric fuel pump instead of the vacuum fed pump. I’m confident I can do that myself. I apologize if I missed a thread that simply answers these issues, but I need some assistance. My wife is pretty pissed that I spent so much money on this engine only to make the cart unusable.... Thanks in advance! |
Today | |
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 |
|
11-01-2020, 08:13 AM | #2 | |
Crazy Ole Man
Join Date: Jan 2016
Location: Owego NY
Posts: 2,758
|
Re: VC625 starting and running issues
Quote:
|
|
11-01-2020, 12:11 PM | #3 |
Not Yet Wild
Join Date: Jul 2019
Location: Bay Area, CA
Posts: 15
|
Re: VC625 starting and running issues
Ok, this should be #3. Any help would be greatly appreciated.
|
11-01-2020, 05:39 PM | #4 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,433
|
Re: VC625 starting and running issues
With most of these clones you either buy an adjustable carb or you adjust that one. To get the idle you need the idle mix screw usually on the side near the head. Due to the epa they either cap them and you have to drill the cap out, or they break the screw off in there you have to slot it with a dremel and heat with a solder gun to release the loctite to get out. You can buy screws and kits on ebay/etc. Richen the idle and slow idle down, then get it good and turn the idle screw out a little more maybe quarter turn that is often a good setting and better starting. Unless you have a governor on it pulling the throttle open at rest then they need choke nomatter usually. Far as running you may have to richen the main especially if you changed the airbox and/or exhaust to flow more. You can buy jets or buy a torch tip cleaner and file that one larger with it. Once you get it running good you don't have to mess with it again. Make sure when you jet anything the engine is warmed up at the time.
|
11-01-2020, 06:19 PM | #5 |
Not Yet Wild
Join Date: Jul 2019
Location: Bay Area, CA
Posts: 15
|
Re: VC625 starting and running issues
Any idea what carb I can buy that will work with this engine? Will they all bolt up or is there an adapter plate needed?
|
11-02-2020, 08:13 AM | #6 |
Gone Wild
Join Date: Sep 2018
Location: Michigan
Posts: 291
|
Re: VC625 starting and running issues
You mentioned that the pulse line is hooked up to the valve cover. Did you do that? The VC625 comes with a pulse line fitting to the crankcase, not the valve cover. I would start there, with the G2 this should make for a very short pulse line, which should improve signal. Make sure that no oil gets into the pulse line as that will weaken/block the signal. Another route would be to remove and clean the carb thoroughly, these small engine carbs have small jets/metering holes. They can easily become blocked from small debris. Also double check you have the connections to the pump correct. Maybe post a picture up of the engine bay to see what exactly were working with as far as line routing and filters.
|
11-02-2020, 11:58 AM | #7 | |
Not Yet Wild
Join Date: Jul 2019
Location: Bay Area, CA
Posts: 15
|
Re: VC625 starting and running issues
Quote:
Could it be that the vacuum level is weaker at the head and not pulling as much as it should be causing less fuel line pressure? The line isn’t blocked. It’s a clear line and the engine has less than 2 hours on it since I haven’t been able to get it running since the install. |
|
11-02-2020, 01:11 PM | #8 |
Gone Wild
Join Date: Sep 2018
Location: Michigan
Posts: 291
|
Re: VC625 starting and running issues
Ahhh, I remember that now. Its very possible that could cause some issue with the pulse signal that they were unaware of with this engine. I know some of the smaller displacement engines have used this style with no issue, but it just may not work with the 625.
Do you have a link to the pump that you bought off from Amazon? Here is a picture of my return line setup. I used plastic fittings suitable for use with gasoline. Hardest part was drilling the tank without getting debris in it. |
11-02-2020, 01:50 PM | #9 |
Not Yet Wild
Join Date: Jul 2019
Location: Bay Area, CA
Posts: 15
|
Re: VC625 starting and running issues
Here is the link. Same part number, but appears to be a 3rd party manufacturer
New Fuel Pump for Yamaha Gas Golf Cart G2 G9 G11 G14 J38-24452-10-00 https://www.amazon.com/dp/B07NL5VXSL...ing=UTF8&psc=1 |
11-02-2020, 02:21 PM | #10 | |
Crazy Ole Man
Join Date: Jan 2016
Location: Owego NY
Posts: 2,758
|
Re: VC625 starting and running issues
Quote:
https://affordablegokarts.com/pages/fuel-pump-setup |
|
|
Thread Tools | |
Display Modes | |
|
Similar Threads | ||||
Thread | Forum | |||
93 DS - starting/running issues | Gas Club Car | |||
Foreseeable issues running a 36v cart, running at 48v? | Harley Davidson | |||
G9 starting/running issues | Gas Yamaha | |||
G1 Starting/low speed running issues | Gas Yamaha | |||
95cc starting, running, microswitch issues | Gas Club Car |