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450 carb not going back together smoothly

  • Thread starter Thread starter Mike
  • Start date Start date
M

Mike

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I've got them almost back together but when I put the float bowl back on, the needle jet seems to be blocking it. The needle jet is down as far as it will go, and the bowl will go down to about 1/4" from seated. Is this normal and you just have to muscle it in, or is something out of whack?
 
Is the jet rotated properly? I think there is a pin on the side to orient it.

Disclaimer: I have only worked on one set of 450 carbs and didn't like them because they were so different than what I usually work on. :oops:

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I don't think it anything on it that would align it a certain way. I could be wrong though.
 
On the carbs for the larger bikes that I usually work on, there is a pin in the carb body. When the needle jet is lowered into place, there is a slot that goes over the pin, it keeps the needle jet from turning when you tighten the main jet into the end of the needle jet.

I do remember that the 450 carbs are different, I just don't remember the details. I think it was Flaming Chainsaws that wrote up a carb rebuild series for the 450, might try doing a search for it.

OK, did the first part of thet search for you, it's on BassCliff's site.
doh1.gif


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I used that write up to do the cleaning and it doesn't mention any pin, that's why I don't think it has it
 
Mike said:
I used that write up to do the cleaning and it doesn't mention any pin, that's why I don't think it has it
Click to expand...
No, there are no pins on these carbs. And the float bowl should just easily go on without having to force it. Hmmm... Are you sure the needle jet is all the way down? If yes, then maybe something else is blocking the float bowl from going in smoothly. Check it over again.
 
Flaming Chainsaws said:
No, there are no pins on these carbs. And the float bowl should just easily go on without having to force it. Hmmm... Are you sure the needle jet is all the way down? If yes, then maybe something else is blocking the float bowl from going in smoothly. Check it over again.
Click to expand...

Yeah, it's seated as far as it can go. The odd thing is that both carbs are like this.
 
Mike said:
As far as I can tell. Only had it for a week.
Click to expand...
Maybe try posting a picture up? I wanna see it.

Try to get a picture of the float bowl and the needle jet area.

I'll ask this too, did they fit just fine when you removed them?
 
Mike said:
I've got them almost back together but when I put the float bowl back on, the needle jet seems to be blocking it. The needle jet is down as far as it will go, and the bowl will go down to about 1/4" from seated. Is this normal and you just have to muscle it in, or is something out of whack?
Click to expand...

If you are trying to install the float bowls and have them rotated 180 degrees (backwards), they will only go on to about a quarter inch gap and not go all the way down.

If you removed the float needle seat and replaced those "O" rings and did not reinstall the seat fully. the bowls will also not go down into place.

The bowls should install with no more than light finger pressure. If they do not, then you have something installed incorrectly. Definitely, do not force anything together.

Can you post a pic?

Earl
 
I may have narrowed it down. With the needle jet out and sitting in the float bowl where it should go, it stops about 1/4" from where it seems it should go. I'm assuming it should sit flush down on the surface there?

584bd32f.jpg
 
Adler said:
That looks the right way to me... can you see anything that is obstructing it?
Click to expand...

It looks like there's a lip on the inside of the hole it sits in.

If anything, I've got two more float bowls already on their way, so I'll check to see how those fit.
 
I appologise if i'm wrong, with my carb the o-ring end is down in the body.
 
Mike said:
I may have narrowed it down. With the needle jet out and sitting in the float bowl where it should go, it stops about 1/4" from where it seems it should go. I'm assuming it should sit flush down on the surface there?

584bd32f.jpg
Click to expand...

You have it installed upside down. The "O" ring goes into the body. If the "O" ring stuck up in the air, it couldn't seal anything could it? LOL Turn them over and tap them in ....lightly... using a small block of wood and a SMALL hammer if they absolutely will not press in with your fingers. Do not strike the jets with the hammer, hold the wood over the jet and tap the wood.

Earl
 
Woodsy said:
I appologise if i'm wrong, with my carb the o-ring end is down in the body.
Click to expand...

earlfor said:
You have it installed upside down. The "O" ring goes into the body. If the "O" ring stuck up in the air, it couldn't seal anything could it? LOL Turn them over and tap them in ....lightly... using a small block of wood and a SMALL hammer if they absolutely will not press in with your fingers. Do not strike the jets with the hammer, hold the wood over the jet and tap the wood.

Earl
Click to expand...

The jet is in correctly.
 
Yep, that's in correctly. The O ring end goes into the carb body, whereas that pic is the float chamber.



So, silly question... do you have your gasket on?

 
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