1990 Yamaha G2 - Oil on engine and some oil in air filter box

TechBill

You probably noticed this is my first post since I am new this forum. So I wanted to say Howdy all!

I purchased my first golf cart which is a 1990 Yamaha G2. It runs but need a tune up so I ordered a tune up kits which are air filters, two belts, gas filter, spark plugs and 4 air filter box straps for it.

However there seem to be oil all over on top of the engine, I think it a value cover/cap area. There some tubing going over it to the air filter box and it seem to split off somewhere.

I notice little oil inside the air filter box as well too. So I am wondering if that normal or it should be free of oil? Is the tubing that near the top (value cover I think) contain oils in it? I think it seem to be returning to the crank body housing but not sure.

If that the case the the tubing is leaking oil and need replacing maybe?

Any advice will be greatly appreciated!

Bill

BGW

__________________
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

TechBill

I want to add that I plan to keep it stock as much possible but maybe increase the govrner after I find out how to do it

Bill

cgtech

Check the gasket between the crankcase & side cover. Should be no oil on top or in airbox. Drain oil & add 1qt only. Be sure.to clean out the airbox real.good.

TechBill

Okay

I ordered a tune up kit off E-bay and as soon it arrives, I'll clean out air box and replace the oil. There not actually a liquid oil in it but I can feel the oil on the lining inside the air box and my fingers turn black and oily when I rub it across inside the air box.

Right not it just sitting in my garage until the tune up kit arrive.

While waiting for the kit, I plan to do a compression test.

Thank for the advice!

Bill

sho305

You will want to replace any rubber hose going to the top rocker cover or the fuel lines if they look suspect, they do go bad and cause problems. The one line to the airbox is an engine vent, it will put blowby vapors into the airbox. If you take it off it stinks, and worse the more hours are on the engine. Eventually it can blow out oil especially at high rpm. But normally it does not put oil in the airbox unless you put more than 1 qt of oil in the engine, then it will fill the airbox so don't ever overfill!! It eventually will build up a black oil residue and that is normal, just clean out the airbox when you put in a new filter and its no big deal. Make sure you get the airbox sealed up completely and together correctly, they will run poorly if its not together right. You can buy new clips cheap or bungee cord it tight. If it does puke oil into the box and you have 1qt max oil in it, the engine is likely pretty tired. Normally not enough comes out to plug the air filter before the filter is due for replacement.

The governor you just get under the rear bumper when the cart is cool, reach up under the muffler on top of the trans and there is a bracket that moves with the throttle. It has a 10mm nut on a rod you tighten to go faster. You can take a deep 10mm socket and tighten it until it stops if you want and that is normally close to 20mph give or take on a stock cart instead of the legal 12mph it should be set at. It should not hurt the cart at all. It can shorten the life of the throttle pedal cable because at high speed the governor puts more pressure on the cable, often the cable is far from new so they can break but not a big deal to install a new one. Also check to make sure at full pedal the carb is all the way open and adjust the cable if needed, at the pedal under the floor panel.

TechBill

Thank you for head up on 1 qt oil only rule. I will keep that rule in my head always.

I read up in another post about the governor, I could just bypass it all together and link the cable directly to the carb right? Would it be same as tighten the nut until it stop or does hooking it directly to carb give a extra mph or 2 than tightening the nut?

The tune kit I brought off Ebay comes with 4 new rubber latch for the air box. I read in one other post that air box had to be seal good for the fuel pump to function property. I posted link to the kit I brought on ebay but it wouldn't allow me since I am a new member on this forum. If you go ebay and search on "G2 tune kit", it the first one that come up on search list for 65 dollars is what I brought.

I have attached two photo of the oil on top of the engine. I just brought the cart the other day so I am not sure where it coming from or it just normal to see oil there over the years of use.

Thank for feedback!!

Bill

Attached Images

	top1.jpg (132.0 KB, 0 views)
	top2.jpg (145.5 KB, 0 views)

cgtech

Oh, you have leaky valve cover gasket. Scraping the old one off the head is a huge pain, it ineveitably all stays on the head, with very little gasket on the "easy to clean" valve cover. Stuff some paper towel inside the rocker area to keep scraped debris out of engine. Getting it totally clean will likely take an hour of very detailed scraping with a tiny hobby knife/scraper. Leaving it "not perfectly clean" is sure to result in a recurring leak soon. You could try a engine degreaser job on it first, then run it to see how bad the leak is. BTW, after you wash the engine, it is normal for it to not run 'till it dries, doesnt hurt anything.

TechBill

Okay, I will wait to do a compression test first to see if compression still good or not. This way if it compression not good then I will order a complete rebuild kit which I am sure include the valve cover gasket right?


I plan to do a deep degrease cleaning. Even the starter and gas tank have oil all over on top of it as well too.

Bill

sho305

What can also happen is the oil runs down the fins, then the fins fill up with dirt, then the engine runs hot. You have to take the shrouding off and muffler, then clean all the fins. Its not really hard to do though, I used a can of brake cleaner to spray it out after a while with a screwdriver scraping the fins. I ended up using the black permatex to seal my cover back on and no issues. But my gasket was fine it just started leaking after I set the valve lash.