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Old 07-07-2008   #21
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Re: Walbro Wt-603 New carb Problems


Ok, Check this out, If the pulse hole is what I think it is then Yes my Instake manifold does have a hole for it, It's shown side by side with the carb in the first pic, the second pic is where the intake manifold bolt onto the engine.. let me know what you guys think!

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File Type: jpg DSC00415.JPG (318.3 KB, 5 views)

Last edited by Thomps : 07-07-2008 at 03:04 PM.
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Old 07-07-2008   #22
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Re: Walbro Wt-603 New carb Problems

When you post pic's don't make them that big it make them kinda blurry. Is that the stock reed cage? It looks like the reed cage blocks the pulse hole. Or the pusle hole is inside of the reed area. Either way not good. The pulse hole needs to be open at all times. Can I get a pic of the motor with the reed cage removed?
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Old 07-07-2008   #23
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Re: Walbro Wt-603 New carb Problems

Hey, I'm not completly sure on how to remove the reed cage, The furthest thing I've taken off is the Intake manifold, Should I just gently pry it off or what? Let me know I don't want to try something and f it up.
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Old 07-07-2008   #24
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Re: Walbro Wt-603 New carb Problems

its just stuck from being on so tight, just take a flat head and pry it off, it will come right off
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Old 07-07-2008   #25
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Re: Walbro Wt-603 New carb Problems

Lol Yeah I just got it off with a small flat head, Heres the new pics... Also sorry about the size of the pics, I'm just using my cell phone lol, So It looks like the reed cage is blocking the pulse port, Upon whoevers intstructions it looks to me that I need to either get a reed cage with a hole or put a hole, let me know guys and thanks alot!
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File Type: jpg DSC00417.JPG (367.4 KB, 2 views)
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Last edited by Thomps : 07-07-2008 at 03:59 PM.
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Old 07-07-2008   #26
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Re: Walbro Wt-603 New carb Problems

If you have room to drill the pulse hole in the stock reed cage that's what you need to do. But it looks like there's not enough room to drill it in the stock reed cage. It would be a good time to upgrade to a 4-pedal reed box and cage to go with that walbor carb.
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Old 07-07-2008   #27
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Re: Walbro Wt-603 New carb Problems

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If you have room to drill the pulse hole in the stock reed cage that's what you need to do. But it looks like there's not enough room to drill it in the stock reed cage. It would be a good time to upgrade to a 4-pedal reed box and cage to go with that walbor carb.
Hey thanks for the post, after some more reading it seems that this is definatly my problem, I looked for a 4 pedal reed box and cage and it was 100$ + I'de rather not put any more money into it, Is there any other simple reed cages with a pulse hole? I Will probably end up trying to drill a hole tho.
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Old 07-07-2008   #28
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Re: Walbro Wt-603 New carb Problems

Just put the adapter on the reed cage and put a small drill bit in the pulse hole and turn the drill bit by hand to mark where it is before you drill just to see if there is the room. It looks like you may be able to trim the reeds a little to make some room but they need to seal to so don't trim anymore than you need to.
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Old 07-07-2008   #29
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Re: Walbro Wt-603 New carb Problems

Yeah, I did exactly what you said before you said it lol! The hole turned out pretty good but after i cleaned it all off and I put everything back together attached the fuel lines it still wont start, Theres spark, I took out the spark plug and thought I could smell some gas but it was mostly clean, the way i left it the last time I took it out. So it's still together and I'll probably take it apart tomorrow, the only thing I can think is that one of the gaskets must be blocking the pulse hole, when pressing the ball it still wont fill with fuel and only sends air gas/air up the return line. Whats the next step? Is there some sort of Reed cage that is like the stock on but with a pulse hole?

Also the reeds are still very intact and do seal nicley, I used another dremmel bit to grind them down from the other end of the hole.

Last edited by Thomps : 07-07-2008 at 08:45 PM.
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Old 07-07-2008   #30
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Re: Walbro Wt-603 New carb Problems

is there a pulse hole in the gaskets, and is it matching,

and u can try pouring some gas in the cylinder and then starting it, might just work for u
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Old 07-07-2008   #31
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Re: Walbro Wt-603 New carb Problems

Yeah the gasket has a pulse hole but I'm thinking that it maybe not like completly in the right spot and it may be getting covered... by puring gas in the cylinder do u mean through the spark plug hole?
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Old 07-08-2008   #32
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Re: Walbro Wt-603 New carb Problems

yep, its not the best way to start it but better than nothing
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Old 07-08-2008   #33
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Re: Walbro Wt-603 New carb Problems

Ok, If I do that it will fire up and then what? Hopefully start working the carbs fuel pump?
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Old 07-08-2008   #34
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Re: Walbro Wt-603 New carb Problems

it should fire up, dont pour a lot though, and hopefully the carb will begin to start pumping gas
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Old 07-08-2008   #35
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Re: Walbro Wt-603 New carb Problems

Alright, Ill give that a whirl next time I'm out there, Good thing I didn't already dissassemble the entire carb etc. Thanks!!
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Old 07-08-2008   #36
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Re: Walbro Wt-603 New carb Problems

Did you set the H & L mixture screws Yet? If not set the L screw to 1 turn out and set the H screw to 2 turns out and turn the idle screw all the way in. Does the choke open and close? Does it fire over at all when you try and start it? When you push the primer bulb you should see bubbles going back to the tank that is normal. You will not see gas flowing or bubbles in the main line.
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Old 07-08-2008   #37
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Re: Walbro Wt-603 New carb Problems

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Did you set the H & L mixture screws Yet? If not set the L screw to 1 turn out and set the H screw to 2 turns out and turn the idle screw all the way in. Does the choke open and close? Does it fire over at all when you try and start it? When you push the primer bulb you should see bubbles going back to the tank that is normal. You will not see gas flowing or bubbles in the main line.
The H& L Screws are Set at the default settings, L is at 1 1/4 turn out and H at 2 turns out, The idle screw isn't completly in but I will do that, With some prevoius small gasket trimming the choke opens and closes, When the bulb is pressed air is pushed back into the tank, But the ball DOES NOT fill with gas, Should that be happening? When Pulling it over it doesn't fire up and hasn't yet started, I will probably try pouring a little gas into the cylinder via plug hole and try to start it like Juantao said. Any more help is greatly appreciated!
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Old 07-08-2008   #38
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Re: Walbro Wt-603 New carb Problems

When you say it doesn't fire up you mean does start right? What I mean when I said does it fire over is does it get little rumbles like it's trying to start but doesn't. Sorry just want make sure we are understanding each other here.
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Old 07-08-2008   #39
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Re: Walbro Wt-603 New carb Problems

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When you say it doesn't fire up you mean does start right? What I mean when I said does it fire over is does it get little rumbles like it's trying to start but doesn't. Sorry just want make sure we are understanding each other here.
Yeah it doesn't start, I guess it does fire over like it wants to start but theres not fuel to ignite, I just had it running by pouring small amounts of fuel into the cylinder via plug hole put the plug back in and it starts up with the choke off, It runs for a bit but as soon as it burns that small amount of gas is dies, So The problem remains, Why Is this pos not getting gas? Does fuel flow from the carb's pulse port through the manifold then through the reed cage then into the crank case? Also, I'm still reallly wondering if the ball should fill up with gas if everything is installed properly and it is being pumped?????
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Old 07-08-2008   #40
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Re: Walbro Wt-603 New carb Problems

another way instead of taking plug out to start is to get carb cleaner spray and spray it through the air filter. will put enough in chamber to spark. thats what i used
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