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Old 09-02-2016, 09:38 PM   #1
Sulley
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Default A 2 cycle questions

I got a [i think] a 1984 Ez-go a few days ago for free from a friend of mine and I've never had a 2 stroke cart so I have a few questions about it. I'd like to now what the oil to gas ratio is and if it can even be run with a pre mix.It has an oil injector but it didn't seem to be pumping oil while cranking and of its a problem I might switch to mixing oil and gas instead of using the injection system. the other thing is could it actually use the air flow to suck the oil into the system and I'm worried for nothing? I would like to be sure before I possibly destroy the engine.

here is the cart http://www.buggiesgonewild.com/album.php?albumid=3883
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Old 09-02-2016, 11:07 PM   #2
cart around
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Default Re: A 2 cycle questions

You have an 84 body, and data tag. You also have an 88 exhaust. If you have a Mikuni BV-24 carburetor, you would have an 88 engine.

Remove the oil injection banjo from the intake, and plug the hole with a 6mm screw.

Mix the oil 128:1. One ounce of oil per gallon of gas.
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Old 09-03-2016, 06:03 AM   #3
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Default Re: A 2 cycle questions

Yeah I second cart around's answer.....my oil injectors was working fine when I removed it to avoid any future complications related to pump failure. I mixed the gas in the tank at 128:1 as he said and ran it that way for an hour to get the pre mix through the lines before I took off the injector system. For the 5 gallons of gas I use a year it was well worth it for piece of mind
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Old 09-04-2016, 04:04 AM   #4
my1423
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Default Re: A 2 cycle questions

Why not leave it in place and premix anyway?
Double backup.
64-1 little rich by the book but ran great in my dirt bike for years.
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Old 09-06-2016, 09:52 AM   #5
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Default Re: A 2 cycle questions

What's the compression ratio on a dirt bike? These are only 6:1.
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Old 09-06-2016, 02:38 PM   #6
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Default Re: A 2 cycle questions

isn't the bigger number mean less oil? I'm used to 50:1 and that's pretty much it
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Old 09-06-2016, 03:40 PM   #7
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Default Re: A 2 cycle questions

Quote:
Originally Posted by Sulley View Post
isn't the bigger number mean less oil? I'm used to 50:1 and that's pretty much it
Yes bigger number less oil.
128-1 is the factory pump numbers.

The fuel from the intake charge washes the oil off the intake port and flows it through the engine. Very basic design.
Suzuki made 2 stroke bikes that pumped to oil through the main bearings and interned the case through the rod. Worked excellent. Problem on them was if you disabled the injector you would seize the bottom end. Very rare and usually they would far outlive all others in longevity.
These carts are just fine with premix and no injector.

128 parts gas 1 part oil.
double that from 128-1 premix and 128-1 injector would be
64 parts gas to 1 part oil.
128 + 128 = 256 / 1 + 1 = 2
Lean on oil imo. Probably why all of them have bad bearing and blown seals.
These were designed to fire up cold, drive to a hole, shut down, cool off, fire back up all on a nice damp cool golf course. Not fire up run for an hour in the desert.
Oil does not get worked really hard.

Dirt bike compression ratio could be all over dependent on performance design year. Older bikes ran the 6-1 later water cooled race bikes 15-1 and higher.
They used lots of oil witch can cause 2 issues.
Build up in the exhaust, And fouled plugs.
2 stokes will always have these issues.
Too much oil can cause rapid fouling and or incomplete burning making loads of smoke.

Old bike saying if no smoke its broke.
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Old 09-06-2016, 04:11 PM   #8
Sean5545
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Default Re: A 2 cycle questions

We also need to remember these machines were designed to run at a (low) governed engine speed...the cart I have APPEARED ton never have had the bearings done before I did them this year, that's a 30 year run (bearings weren't even bad but I was already in there) which I would take by 4 stroke standards. The previous owner took the governor linkage off and openly admitted that his kids absolutely beat it for the past few years. I assume the lean oil ratio is due to the low expected running speed, at 40:1 which I'm running now it will foul plugs quite efficiently. I assume if I could crack the engine wide open like a bike or a chainsaw this wouldn't happen as much but the campground would be mad at me and I'm not sure the old girl can do it without some more mods
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Old 09-06-2016, 04:22 PM   #9
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Default Re: A 2 cycle questions

Very true.
It is also common to see these with the original piston ring sets.
This can be to the extremely low hours many of them have.
Shutting down the engine cuts a huge amount of time off the ran hours.


My cart did not smoke too bad at 64-1. Very light on throttle.

I had also shaved the head bumping up the compression ratio.
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Old 09-06-2016, 11:13 PM   #10
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Default Re: A 2 cycle questions

So after everybody's insight I think i will run the cart on 64:1 and I'll shall assume it has a 5 gallon tank since it looks smaller than both my Cushman and Jacobson. Sound good?
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