My First Build Radical Off Road 85 EZ GO

low4life

lol it doesnt have that plate on it, im pretty sure that at one point this cart was stolen lol. and what exactly do you mean by port polishing for these?

thanks a lot for all the great info.

mb523

Basically smooth out the port so air can flow easier. Check out this website:

http://www.aircooledtech.com/exhaust_pp/

NetMXer

Since this is a 2 stroke, cleaning up the intake ports will make the biggest difference. When you remove the reed block from the cylinder, you'll see the opening branches off into several chambers (ie: ports). Just take a dremmel tool and smooth out all the casting marks. You don't need to remove a lot of material. You basically want to turn the intake and exhaust ports from their stock cast look into a clean machined look. The idea is to make it so the fuel flows into the engine with the least amount of turbulence possible. All the stock casting marks causes turbulence in the fuel flow which really restricts the flow rate.
I personally wouldn't bother milling the head. If you take off too much material, you'll have a problem with the engine detonating.

NetMXer

I should have also mentioned, I just tore down my 1987 EZGO engine and you wouldn't believe how poor condition that motor was in. Yours may be in the same shape. You can buy a new top end rebuild kit or even a top/bottom end rebuild kit like I did. If you buy one of those, you can always use your stock cylinder to practice your porting skills on.
If you want to see pictures of the mess I found in my motor, take a look here NetMXer's 1987 EZ-GO Martathon restoration

harleymansam

it would probably help if you got an expansion pipe off of a dirtbike or make one also

low4life

well dont you think that in a sense boring it out is the same as having a new top end of the engine, because it makes it totally resurfaced, right? i will be putting new gaskets and crank seals on it too.

and about that expansion chamber, is that the part on 2 stroke dirt bike exhaust that is like an oddly shaped muffler?

low4life

btw this is my primary toy.



just finished this frame off build for my lowrider.

mb523

Boring it out actually makes the combustion chamber a little bigger, but not much, as well as resurfacing/honing the jug. Yes, I do believe the expansion chamber is the oddly shaped part on the exhaust. In this case, I think modifying the muffler may cause more issues. I would try the port polishing and boring!

Nice car by the way!

groundpounder

sweet car what year is it?

low4life

shes a 71

here is the 2 pump 4 battery hydraulic setup on it, i fully reinforced the frame and suspension to withstand hopping and 3 wheeling
this is the interior