willibe

Hi All,

I'm new to this forum, but not new to 2-stroke engines. I recenlty acquired a 'geo' goped with the funky 2-holed carb. from searching the web, i came up with the model numbers 'GZ25N14 / GZ25N23'.

i was told that the upper hole is to make it CARB legal and utilize unburnt fuel, which is controlled by "reeds". obviously not case reeds.

I am having trouble with getting it to run, and i am curious if i disconnect the hoses to the "reeds" and plug those holes, will it run properly?

It seems like the pulse signal isn't pumping fuel from the carb, as i can pull and pull but never foul the plug. I have replaced the inner carb gaskets/float reservoir diaphragm with no success, and used a bottom end from another carb that i know works, so i'm getting frustrated with it.

I have made a new carb & intake manifold gasket, and i used Yamambond to re-seal the head as well as hopefully improve compression/squish, but still nothing. If i spray starter juice, it will pop, but it won't stay lit.

Sooo, aside from swapping the engine, can i just stuff some JB weld in these holes? should i remove the reeds or just leave them in and JB them as well?

Thinking about it now, i suppose i could swap the entire carb off a mini bike since i am eliminating the upper portion of the 'ped carb, as it is piston port as well, it would just be a matter of lining up the pulse and throat. oh well tonight i will wrench on it, just hoping someone who has done it can shine some light.

any insight would be super.

-will

willibe

sorry, forgot to add:


TL/DR: can i block the 'reeds' on a GEO goped?

Drunkenpedrider

If you remove the tubes it will not run at all. Also, stop spraying starter juice in it cause that isn't designed for a 2 stroke and it basicly eats up the oil in your mixture causing it to run without lubrication when you use starter fluid.
You can block the reeds off but then you have to find either the custom manifold they made for the HP Carb conversion or make one with a moded plastic manifold and then use a hp carb on it. The stock one will not function with the reed tubes blocked.

If you haven't checked the carb manifold gaskets and all intake gaskets I would do so because they are prone to ripping on this motor. If any gaskets are torn in the intake assembly then replace it with a home made paper one using paper gasket material from your local autoparts store. Works great.
Also, if there are any after market parts on it replace with stock parts because these motors hate mods.

It really sounds like an airleak in a gasket somewhere cause thats a common problem with these motors. If you need some parts or a whole new motor I have parts and a running gz motor for you I will sell.

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- GSR G290RC + ADA S1 + 813 = 8==D (|) -

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MISFIT TOYS

The problem is the reeds are leaking by .I have had some luck in flipping them over .But not always If that doesn't work there is a Carb Mod kit for it that has a manifold that eliminates that Dam two barrel carb. It's hard to find but worth it to look for it ...

willibe

that's what i'm thinking, next gasket is the crank case. thanks for the info and i'll PM you if i get desperate and need an engine


ya i flipped one of them hoping that would solve it, but the other one i stripped the little phillips. i thought about cutting reeds out of plastic, but i couldn't get one out so i said f that.

i'm thinking that if i just make a solid gasket or JB weld the reed ports, that will get it in the direction of eliminating these stupid reeds, and i have a walbro 603 carb that i would need to adapt to fit, but it looks like i'm headed in that direction. the throat/pulse hole won't match so thats the challenge for now.

THANKS BOTH OF YOU FOR THE INFO!!

monster_sam112

TGN geo carbie kit. g/l finding that. cant u jus jb weld the reeds shut, and mod a HP mani??

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willibe

..YES WE CANN!!

i just removed the reeds and cut gaskets to block off the valves, so it's just the transfer ports, and it runs! im pretty stoked, idle is rough, so if i can find a better carb to fit the mani i'll be in business.

the top half of the carb is useless at this point, but it runs pretty strong.

we'll see how long the gaskets hold out for, it's just rubber impregnated cardboard, so i may need to JB the valve covers if they blow through

THANKS AGAIN FOR THE HELP!!

-Will

dukem2

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GSR40, GSR47, Sport, Bigfoot, Super-Bigfoot, Super X-Ped, DIY Go-bike, tow-ped

Drunkenpedrider

haha good job man! I didn't think it would run like that. I couldn't get mine too lol.

__________________

- GSR G290RC + ADA S1 + 813 = 8==D (|) -

Metallica - Jump in the Fire

mattreed

might try this to my ow so troublesome geo..

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You can't teach those who are not willing to learn.

willibe

it's not running perfect, i think if i had a tune-able carb it would be better, and the transfer ports probably aren't to perfect specs, but it works better than it did. It's a start either way. Next step is to adapt a better carb.

It came from a trash pile, and the prev. owner had drilled holes in the exhaust can, pretty sweet redneck power-adder. the piston & cylinder are both pretty chewed up on the exhaust side, but i really just want it to run enough to sell it.

if anything i'll just hook up NOS to it and blow the piston into my calf.

Video will ensue

Drunkenpedrider

Those holes in the exhaust can might be whats causing ur problem. (or a leek in the reed?) My gz motor was absolutely gutless until i swapped cans for some reason. Neither were clogged or anything I didn't understand it. You can modify a lh or rc manifold to hook up the hp carb. I forgot which one exactly but me and a friend done it before. Saves time and money trying to find the sorta rare hp carb kit. Just jb weld the reeds.

__________________

- GSR G290RC + ADA S1 + 813 = 8==D (|) -

Metallica - Jump in the Fire

Liama32

make sure your manifold is sealed nice and you have all the gaskets, maybe use 4 small zip ties around the tubes to stop air leaking tie them tight around the manifold and the cylinder.

survive1990

were would you recommend looking lol?

survive1990

so in order to add the hp carb i need to modify a rc manifold?

Drunkenpedrider

Yeah I do believe so. I think thats how i did it a few years ago. either that or if you are lucky you can find the kit from someone but i doubt you will. they haven't been made in many years.

The kit also came with block off plates for the reed valves which also isn't made anymore. So what you can do is take the reed valves and fill them with jb weld. if you ever wanna convert back to the way it was originally you can just buy a new set of valves.

__________________

- GSR G290RC + ADA S1 + 813 = 8==D (|) -

Metallica - Jump in the Fire

pedguyman

anyone have a picture of a modded rc mani????

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Onimun

Ive heard of people making them out of JB weld and wood. Ive wanted to try that for awhile.

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pedguyman

haha really? wood and jb.

man im looking all different words in the search for a modded rc one, but am having no luck finding anything.

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dukem2

basicly like this at the bottom of the page. just gota make an adapter to mount to the intake and mount the mani to that http://www.gopednation.com/forum/sho...d+geo+manifold

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GSR40, GSR47, Sport, Bigfoot, Super-Bigfoot, Super X-Ped, DIY Go-bike, tow-ped

pedguyman

get out of my mind!!!!

i was just on ddm and i was looking at the geo mani and i see that the bolt holes are oppiste. thanks for the like. i will be making one.

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dukem2

yup pretty easy to make

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GSR40, GSR47, Sport, Bigfoot, Super-Bigfoot, Super X-Ped, DIY Go-bike, tow-ped

Dragonfire

1)make more than one
2) make it compatible to a wide range of carbs, buy cardboard to cut some gaskets outta it or buy cy gaskets
3) get sheetmetal, drill in holes and then cut in in small blockoff-seized pieces.
You may need a watercutter or lasercutter to keep these straigt, or use aloy and a diamond bandsaw
4) offer that kit that only needs a carb any will have allready as geo-bf ( with longer throttle ble also x25, s25 and so on) and geo-quad upgrade at like 29/39 dollars on here
5)??????????????

6) Profit

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pedguyman

nah not worth my time to make any. ill make my self one. all i need is the block of aluminum or metal. if i use metal ill need to make an insulator gasket tho.

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survive1990

genius =)

HELYEA666

i want to do the same to my goped but i looked for the hp carb kit for the same engine on go meyer, it is not supplied anymore. then on goped depot, the same thing but the kit shows up but if u click on checkout after "adding" the item to your basket, it says basket is empty.

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2-stroke 4 ever