Unknown Yerf dog

[99kohen99]

I recently picked up this go cart for free wanting to get it running for kids to mess around on. From what o have seen this is a 2 stroke motor, hence the oil injection tank. The shaft to crank case length is also 7inchs, compared to the 9.5 inches on the 150cc motors. Also this motor has a disc brake on the rear axle and the 150cc motor I have seen seem to have drum brakes on motor shaft.All I'm after right now is a motor to fit this thing and get ball rolling on fixing it up. I have attached pics to see what I'm working with.

 

[99kohen99]

More pics.....

 

[landuse]

Looks like a gy6 to me. Thats a nice score if you got it for free

 

[itsid]

well you took a pic of everything except the motor.. we see it's tanks, it's cvt case and it's output shaft..
but we cannot see where the magic happens...

Anyways the motor number yields yerfdog serchresults so I assume it's the original engine.
which in fact be the std 4 stroke gy6 landuse already identified

but to be sure if it's a four or a two stroke show us the cylinder head!
(two strokes have no valves in their heads thus don't have a valve cover.. that simple to tell )

'sid

 

[ezcome-ezgo]

Fascinating. So a Yerf Dog came with a kick-start?

 

[99kohen99]

Ok think it is a 2 stroke by looking at the cylinder head. I dont see a valve cover not placed to adjust valves. But I could be wrong as I'm just starting my research on this cart. Here is some more pics for you all to help me fig out model of cart and what engine it has and my options.

 

[99kohen99]

More....

 

[itsid]

Fascinating. So a Yerf Dog came with a kick-start?

I think I might have worded my response incorrectly..
what I was trying to say was:
that motor model/partnumber could well be the original engine partnumber.
The kickstarter is part of most all gy6 engines and could surely be left off for go karts (hole plugged usually)
So yes likely a replacement engine, not the one that came with the kart.. but still it might be IDENTICAL to the original one.

Ok think it is a 2 stroke by looking at the cylinder head. I dont see a valve cover not placed to adjust valves. But I could be wrong as I'm just starting my research on this cart. Here is some more pics for you all to help me fig out model of cart and what engine it has and my options.

I still can't tell I'm afraid..
I know it's crowded in a kart's rear end and I can tell you did your best to get the shots needed holding your phone in all the most awkwarded ways just to satisfy my request.
but with the pic's orientation all over the place and the shots so close that you can see
not much more than a single cooling fin and a head nut...
it's still quite difficult to be precise..

So let's try this backwards..

the kart appears to be a yerfdog 40000 to me
judging by the rear brushguard mount and -I'm afraid to say so- the engine

http://www.bmikarts.com/PDF/40000.pdf

with that manual at hand, the engine looks a ton like yours in the pictogram and as you can see the second tank (oil?) is also depicted in the manual..
at least we're very very close, right?

Now.. looking around I found this :
http://www.diygokarts.com/vb/showthread.php?t=24993
see? looks a lot like your engine, not?
(heck it even has the kick starter in place *giggle*)

So with that pic of a confirmed 40000, your motor number and the manual
(asking you to fill in 2 stroke oil to the second tank)
I think we can safely assume you are correct, it is a two stroke engine,
landuse is also correct in assuming it to be a gy6'esque engine

And we can tell reasonably surely it's a 90cc two stroke gy6

Oh why a 90cc you might ask?

well your motor number is
GM "1PE50QMF-2"
that's why

'sid

 

[99kohen99]

Awesome work on reply. After searching and taking in what you have said, I think I want a 4 stroke motor in this thing. But how? Can I use a 150 gyx motor and mate it to the short "tranny" where the out put shaft is?

 

[itsid]

you will need to find one that's already set up for go kart use (ie with sprocket not wheel axle),
and one that fits in your kart of course.

maybe an standing cylinder short case .. IDK

there are simply too many variations, inconsistencies and too little sound documentation
for these engines, that I can't tell for sure.

I never had one of those, and I try to avoid them myself because of the above
(although one particular go kart tickles me for quite some time now)

take carefull measurements and feel free to search for an alternative engine,
My best guess is, you will have to reweld the mounting spots on your kart at least to make it fit.

'sid