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Putting the carburetors back together

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Putting the carburetors back together

PostAuthor: Cykomiko » Mon Oct 29, 2018 4:03 pm

Hi all,

I just changed all diaphragms on my XV carburetors. There are in place as they should be.
It worked fine, apart for two little things.
1.One plunger goes down slower than the other. Not by much, but it is noticeable. Plungers color have turned from copper to brownish. Maybe it is the reason?? (corrosion? )
2. There is a tiny hole at the bottom of the plunger, right next to the needle. Does this need to be in a particular position when I put everything back together?

Thanks for your help on the matter. Glad to help with anything if I can!

Mika

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Re: Putting the carburetors back together

PostAuthor: Flyingdog » Mon Oct 29, 2018 5:02 pm

Cykomiko wrote:1.One plunger goes down slower than the other. Not by much, but it is noticeable. Plungers color have turned from copper to brownish.


Not familiar with the 500. What year is it? Far as the slide goes..could be one of the problems. Rub it down with a Scotch Brite pad, Brasso brass polish or even something like Turtle Wax polish usually helps. If you're gentle, #1000-1500 grit with water or some liquid works, too. Up & down motions only. There's really many ways to clean them up. If that's your only problem. Don't over look the slides' bore, too. Sometimes, if the diaphragm isn't installed correctly it can hang the slide.
All said and down, you're looking for the "Clunk" test when ya let the slides fall on their own. (And I'm not talk'n bout letting them fall on the floor) Be surprise how many get this wrong. :bg:
Do your carbs have the black hoses w/the black bulbs coming from the top of carbs? They need to be clear. Have been known to plug up. Absolutely needed for the slide to work right.

Cykomiko wrote:2. There is a tiny hole at the bottom of the plunger, right next to the needle. Does this need to be in a particular position when I put everything back together?


There again..is it Hitachi carb? Hitachis' have vacuum holes in the bottom of slides and they must face toward the cylinder. Yours? I will assume it's the same.

Someone more familiar with the 500 could verify. The year would be helpful to look it up.
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Re: Putting the carburetors back together

PostAuthor: bstig60 » Mon Oct 29, 2018 5:39 pm

Flyingdog wrote:There again..is it Hitachi carb? Hitachis' have vacuum holes in the bottom of slides and they must face toward the cylinder. Yours? I will assume it's the same.


These are Mikuni downdraft carbs...........
Last edited by Jake on Tue Oct 30, 2018 6:33 am, edited 1 time in total.
Reason: Quote fixed
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Re: Putting the carburetors back together

PostAuthor: Flyingdog » Tue Oct 30, 2018 1:11 am

bstig60 wrote:These are Mikuni downdraft carbs...........


"As" with Hitachi, the Mikuni (w/ round slides..83'?) the vacuum hole goes toward the engine.
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Last edited by Flyingdog on Tue Oct 30, 2018 9:43 am, edited 1 time in total.
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Re: Putting the carburetors back together

PostAuthor: Jake » Tue Oct 30, 2018 6:38 am

Flyingdog wrote:
Not familiar with the 500. What year is it?


My resources tell me the XV 500 SPECIAL 26R is a 1983. The year is important for us to know as the 500 was manufactured at a later date.

Please add the year to your profile so no one has to ask in the future, not all members can determine the year by 26R.
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