2pg carb vs 3pg carb... feeling idiotic.

loudgoldwing

Hi guys.

What is the jetting difference, if any, between a 2pg carb and a 3pg carb?

All summer, I had fun with a 1986 Marathon 2-stroke I bought for my 40th birthday. However, it developed an issue. The gas wouldn't shut off when I stopped running, and it would flood.

Easy. Stuck float, or the needle was shot. Got a new carb. Didn't help. Same problem. So I rigged a fuel switch to control the flow of gas to the carb manually. Worked great.

But when I ran the carb dry, as I would from time to time, it would take a really long time to get her running again. Then it hit me. It wasn't the carb that was the issue. It's the fuel pump. Fuel is just flowing through it. Fuel doesn't move when the motor moves until the compression of the engine causes enough vacuum that gas sucks through the carb. But the fuel pump also doesn't HINDER the flow of fuel when the motor stops, causing the gravity feed from the tank to continue pouring gas into the carb, and flooding the engine. PHEW!

But that's just the start. I decided to treat myself for Xmas, and upgrade some pieces. I bought the new fuel pump, another new carb just in case, and a muffler. THIS is where it gets interesting. The muffler I bought is for my '86 marathon 2pg. Problem is, the muffler ON the cart has a foot-long "U" shaped manifold pipe coming out one end and bending back toward the other end. Uh... I think that's a muffler for a 3pg. And the only engine that a muffler for a 3pg is going to fit without major modification IS a 3pg.

So... I guess my '86 Marathon is actually a '89 Marathon, hey? Learn something new every day, I suppose.

The 2pg muffler I just bought has a manifold pipe of about 3" in length coming out the front. If the engine in my cart a 3pg, it's a 3pg. But a 3pg muffler costs $750. No way. If I decide that I still want to put a new muffler on, I'll just cut and weld on the exhaust stack a bit, splice in some 1 1/2" flex pipe, I can make the muffler I bought work just fine.... No big deal... 244cc displacement for both engines, pushing the same amount of air and...

...(OH MY GOD) burnt fuel!

Could somebody here please explain to me if there is any the difference in JETTING between the 2pg and 3pg caburetors? I remember now that I had to re-spring the @#$!ing carb I bought earlier this year, as the butterfly spring tension was set up to rotate in the opposite direction of rotation from the original. I just blamed it on poor Chinese workmanship. I obviously had the entirely wrong carb, and it didn't even dawn on me at the time. Moron.

I'm thinking that the main difference between the carbs was the positioning and layout of the different components. But if there's a major difference in jetting, I'm going to do some serious damage to that little engine, if I haven't already. To that wonky carb's credit, the cart DID run all summer.

Thanks guys,

LG

BGW

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Vavoomskill

If there both bv18 carbs I'm guessing the jetting is vary close, you could pull the bowl's and check the jets, and if there not marked you could size them with the butts of drill bits from a small drill bit set