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PROBLEM SOLVED

Anytime I post for help on a forum I like to make my last post a detailed acct. of what I found as I so much appreciate the time that members like Alleyoop, Beachbum, etc. are willing to devote to total strangers. I recommend anyone recieving help do this so that other members will benefit from the search function for solutions. Thanks guys!!!

So anyway, as you know, the only visual problem I had found so far was a leaking/defective bowl gasket on the carb. So this morning I replaced the gasket with the used one from my old carb, carefully using a light coating of black gasket maker as that is what I had laying around. (I do not normally recommend sealers on a carb as you have to be able to take it apart and back together easily plus sealers can stop up passages etc., but the old gasket was flattened out and prolly would not seal, I did not have another one and was ready to get this show on the road...lol)

I then reinstalled the carb, fired up the buggy and took it for a spin not bothering to put the airbox back on and it ran like a bat outta hell all the way through the throttle.

So I'm thinking how the heck can a minor leak from a bowl gasket have cause this?

So I go ahead and button up the stock airbox on it and take it for another spin.

Right back to where I started..no additional speed/rpms, whatever past about 1/2 throttle!

So I take the side cover and filter off the airbox and try again...no improvement...

Alright then. I remove the complete airbox and tube to carb. She runs like a bat outta helll again!!!

She just simply wasn't getting enough air at the top end even with nothing but the stock airbox opened up and the airbox tube.

So I got to looking in the tube and noticed that where the tube curves then curves back again, even though there were no foreign restrictions, just the way it curved and the fact that it was old and a bit soft and ovaled out seemed to cause a weird flow and restriction.

That being said, I will be rigging up a straight pipe with pod so as not to trash out my carb. In the meantime, think I'll just throw a piece of pantyhose over the throat so my kid can play today....lol

Some may think I just solved a jetting issue at the main from the opposite direction by increasing air flow...but I don't think so because...

1) I am running a new stock replacement carb, and altho I don't know what the jet sizes are they are stock for the original airbox.

2) I've pulled the plug after every test run throughout this ordeal and its the best I've ever seen a plug look, right on the money.

3) Has always, since I did other initial repairs, started right up and idled smooth, and been responsive up to that 1/2 or so throttle mark.

So it was just starving for air at higher rpm.

So just another simple thing ou can try if you have this problem!

Thanks so much, I learned alot about these gy6's here....totally different from the old skool chops I build. AWESOME forum! I will enjoy popping back in.

...so I ran back down to mini storage and checked compression while the carb is still off...not gonna suck anymore air than that!

180 (I think that rates AWESOME in Alleyoops... lol)

OK, 130, so good compression. Valve lash is good. Will have to wait to pull the variator as I don't have impact and the nut was too stubbern for my old skool rope in the cylinder trick as I didn't have room for much leverage (worked good on stator side).

I did pull the carb to find the leak which was getting a little worse and found that the bowl gasket had been pinched upon assy. Gasket from my old bowl was to wore to use it. Will have to see if I can come up with just a bowl gasket without having to buy the whole kit.
I live out in the boonies and use ebay usually. Ideas?

I don't think it was leaking bad enough to starve for gas at top end, pretty small leak, but who knows? didn't seem to be a problem when up on the stands...

Did go ahead and pull and check the main while I had the bowl off just to be sure it was clear. It was.

I hope I find the weights are messed up to be honest because after that I have no ideas...but to me the weights still don't explain it running so good for the first hour or on the stands? Trying to wrap my head around it. I'll be near a harbor freight on tues. I think.

BTW, the plug looks beautiful, just that nice light brown speckle of a good burning spark.

OK, I didn't see that last video before I left (so i might have to find an impact driver depending on your response to the following)...however my visual observations were that as I increased throttle the belt did ride up on the variator (the rear half of the variator moved out) and as I decreased throttle it rode back down (variator moved back in).

But the other strange observation I made again was that while the kart is up on the stands vs. down on the ground actually riding it, it sounds great. You can actually hear and feel the continued increase in rpms beyond half throttle on up to full throttle?

so would this still be related to the weights even tho visually I can see the belt moving up the variator and it sounds great on the stands with no load or whole different problem???

Hey alleyoop.....would it be the same to just put it up on stands and see if the slide is operating properly vs. pulling the diaphram?

...and why does it not seem to bog when on stands?

sorry...lots of questions, just trying to sort this out in my head after chasing so many other gremlins.

Hey beachbum,thanks for the quick response. The leak is up higher (below that vacuum thing on the throttle side is where I saw vey light wet dirt accumulation?) and so minor I don't think it relates to the problem (I literally rubbed my finger on side of carb to find it...not puddling anywhere.
I sprayed around intake and all is good.

Running a stock filter housing in good shape, no cracks etc. and same problem with or without it mounted.

Also ran kart with and without it mounted for that first hour when I first put the carb on and was testing it. At that point kart ran good either way.