Inject Carb Cleaner directly in float chamber - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 08-08-2017, 07:27 AM Thread Starter
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Inject Carb Cleaner directly in float chamber

I've decided to bite the bullet and start on removing the carbs from my 92 VN 750. Currently, it runs fine with choke on, but once I turn off the choke, it won't run idle. I've tried a few additives to clean it without removing, to no avail. So my main objective is to clean the pilot jets.

However, I was wondering whether it would do any harm to inject some carb cleaner directly in the float chamber, without separating the two carbs (that would add complexity to this mini-project, which is hard enough as it is given my lack of mechanical experience ? Would it do damage to the float, given that it's made of plastic/rubber of some sort?

thanks in advance!

Last edited by maverikster; 08-08-2017 at 07:31 AM.
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post #2 of 14 (permalink) Old 08-08-2017, 09:11 AM
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It shouldn't harm the floats, but I'd rinse it after with fuel. If your pilot jet(s) are clogged you will have to remove the the float bowl to get to them.
Be careful spraying into the carb, as it can blow back at you (read as wear eye protection)
Folks have successfully removed the float bowls with out taking the carbs off...but not an easy thing to accomplish.

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post #3 of 14 (permalink) Old 08-08-2017, 09:40 AM
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It won't hurt the parts, but won't help much.

It could make things worse if the cleaner is sprayed into a dry bowl. Any dirt loosened is then free to migrate into the jets and passages.

I have seen carb cleaner melt the tips of certain needle valves, but ours are rubber and I haven't seen it yet on the VN.

Have to bite the bullet and tear them apart.

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post #4 of 14 (permalink) Old 08-08-2017, 10:04 AM Thread Starter
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thanks for the replies! I will hold off on spraying carb cleaner directly in the float chamber; perhaps some compressed air only.

I thought I'd be able to unscrew the pilot jets by opening up the covers (with the drain) at the bottom of each carb?
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post #5 of 14 (permalink) Old 08-08-2017, 10:20 AM
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It has been done by removing the float chambers with the carbs in place. Seemed tricky and tedious to me, but if you still have the airbox, removing the carbs is no easy job either.

Need a 90 screwdriver for the screws, then I would try a wrench or socket instead of screwdriver for the jets. Some have replaced the bowl screws with hex head bolts to make the next time easier.

One thing with doing this on the bike, you can't work on the other passages in the carb as well.

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post #6 of 14 (permalink) Old 08-08-2017, 10:27 AM Thread Starter
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Ah, sorry, then I must be mistaken on my end. I thought the float chamber was the name of the part which had the float in it (the big rubber piece). It seems you are referring to the drain part which holds the jets?

I've tried removing the drain covers with carbs in place and use a hooked screwdriver to unscrew the pilots, but that was mission impossible (sort of). Just couldn't get a good visual on the jets and enough room to screw them out properly. So I'll remove the carbs for easy access to the jets. Just wanted to prevent to break up the two carbs to access the float :/
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post #7 of 14 (permalink) Old 08-08-2017, 10:53 AM
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Yes, sorry...on these carbs the part is called the "drain cover" (the triangular plate on the bottom of the carb) on some carburetors (Mikuni) the chamber that houses the floats is called the "float bowl", it's the actual container that holds the fuel and the float, needle valve and needle seat. Both of these give access to the jets. The "bowl" on the Vulcan is a seperate chamber, due to I guess, because of the angle the carbs sit on the motor.
Being old school I keep calling it the float bowl...sorry.

Good photos here:

https://m.imgur.com/a/MXhCi

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post #8 of 14 (permalink) Old 08-08-2017, 11:01 AM Thread Starter
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cool thx. I'm on the same page now . Hopefully the bike will idle properly after having cleaned out the jets...
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post #9 of 14 (permalink) Old 08-08-2017, 11:39 AM
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Quote:
Originally Posted by maverikster View Post
cool thx. I'm on the same page now . Hopefully the bike will idle properly after having cleaned out the jets...
Yes, that's most likely a clogged pilot jet or clogged idle circuit. It's worth trying.

Working from memory, I mistakenly included the float chamber as access to the jets, this is the only carb like this I've dealt with, and I've only done mine once so far.

You're on the right track.

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Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

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post #10 of 14 (permalink) Old 08-10-2017, 12:16 PM Thread Starter
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I've been trying to remove the carbs, but no luck yet. Given that the tank is off (amongst others), I do have a better sight at the drain 'chambers' and will attempt to remove the jets like it is now.

Question: in the attached pic, the piece (in red) on the cylinder is blocking my hooked screwdriver. Is it safe to remove that part from the cylinder, or will this cause all kinds of mayhem?
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