easy way to get gas into carbs after rebuild for sync - Ex-500.com - The home of the Kawasaki EX500 / Ninja 500R
 
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post #1 of 18 (permalink) Old 11-12-2013, 10:58 AM Thread Starter
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easy way to get gas into carbs after rebuild for sync

I figure:
- Hook up to petcock without mounting tank. Use a longer cable for ease. Not sure how to deal with vacuum activation of the petcock.
- Use a secondary bottle of gas. Might have to suck on it to get it flowing...
- Ram a funnel into the fuel line and pour some in

Anyone have a better option?
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post #2 of 18 (permalink) Old 11-12-2013, 12:08 PM
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Re: easy way to get gas into carbs after rebuild for sync

My method may be unorthodox but I simply put the bike back together run it to fill the carbs then pull the tank again and do the synch with the carb already filled and the bike already warmed up. I cap off the vac nipple and use a motion pro. It takes less than 10 seconds and I have 6 minutes of fuel in the bowls. Works like a champ. Don't forget bike needs to be at operating temp to do the synch.



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post #3 of 18 (permalink) Old 11-12-2013, 12:10 PM
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Re: easy way to get gas into carbs after rebuild for sync

Motion pro gets hooked up to the vac nipples I don't cap them off. Forgot for a minute. Ignore that part in my last post.



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post #4 of 18 (permalink) Old 11-12-2013, 5:34 PM
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Re: easy way to get gas into carbs after rebuild for sync

hanging remote container, gravity fed

also convenient for bench testing carbs

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post #5 of 18 (permalink) Old 11-12-2013, 5:47 PM
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Re: easy way to get gas into carbs after rebuild for sync

I've heard of people using Lucas bottles since they have a nice pointy end. Just cut out the bottom and hang them upside down stuck into some fuel line for a cheap DIY hanging remote fuel tank (similar to your funnel suggestion, but slightly less crude).

If you want to use the stock tank/petcock, you can activate the vacuum valve with a syringe. A longer length of fuel line would probably make this easier as well.

Or like Florida said, full bowls should be enough to sync them if they're not horribly off. You can use a feeler gauge on the throttle butterflies to get it set pretty close on the bench, to minimize the time needed while it's running.


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post #6 of 18 (permalink) Old 11-12-2013, 8:03 PM Thread Starter
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Re: easy way to get gas into carbs after rebuild for sync

How does the carb pull fuel with the petcock vacuum sealed anyway?

I would think no gas in carbs => no gas in engine => engine won't run or pull air => no vacuum in carbs => no gas in carbs, but that's obviously not the case.
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post #7 of 18 (permalink) Old 11-12-2013, 8:21 PM
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Re: easy way to get gas into carbs after rebuild for sync

Quote:
Originally Posted by abandonliberty
How does the carb pull fuel with the petcock vacuum sealed anyway?

I would think no gas in carbs => no gas in engine => engine won't run or pull air => no vacuum in carbs => no gas in carbs, but that's obviously not the case.
Just cranking it with the starter pulls enough vacuum to open the petcock. If you run it completely out of gas (either from running the tank empty or just turning the petcock Off until the engine dies), you'll have to crank it for a bit to get the gas flowing out of the tank, so it can fill up the bowls and actually allow the engine to start.


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post #8 of 18 (permalink) Old 11-13-2013, 6:06 AM
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Re: easy way to get gas into carbs after rebuild for sync

If you have a vacuum operated petcock and disconnect the vacuum line then no gas should come out of it.

One more trick is to get a short piece of vacuum hose put it on the petcock, suck on the end then immediately clamp it with vice grips then fuel should continue to flow. Another variation of this is to use a syringe on the end of a short vacuum line.

There's a hundred ways to get to the same place, of course my way is best that's why I do it that way.




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post #9 of 18 (permalink) Old 12-8-2013, 8:30 AM
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Re: easy way to get gas into carbs after rebuild for sync

Couldn't you just funnel gas into the fuel line to the carbs?
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post #10 of 18 (permalink) Old 12-18-2013, 1:23 AM Thread Starter
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Re: easy way to get gas into carbs after rebuild for sync

Quote:
Originally Posted by maldyy
Couldn't you just funnel gas into the fuel line to the carbs?
probably one of the easiest alternatives if you can steal an appropriate funnel from the kitchen
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post #11 of 18 (permalink) Old 12-18-2013, 10:09 AM
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Re: easy way to get gas into carbs after rebuild for sync

Quote:
Originally Posted by maldyy
Couldn't you just funnel gas into the fuel line to the carbs?
Thats basically what a gravity fed auxiliary tank does. So yeah that should work.

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post #12 of 18 (permalink) Old 12-18-2013, 1:58 PM
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Re: easy way to get gas into carbs after rebuild for sync

I use a gpz 500 coolant bottle for my petrol
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post #13 of 18 (permalink) Old 12-18-2013, 2:29 PM
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Re: easy way to get gas into carbs after rebuild for sync

That's a great idea. Can probably pick them up on ebay for pocketchange.

I remember buying a coffee can and a nipple and asking this welder mc mechanic to weld it. When done I had over $20 in it and some lousy non drinkable coffee then used it once and said screw this.

But yeah a spare coolant overflow bottle would be ideal if going that route.



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post #14 of 18 (permalink) Old 12-18-2013, 2:59 PM
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Re: easy way to get gas into carbs after rebuild for sync

I have a small tank salvaged from a lawn mower, hung near where I tune carbs, It has a convent on off petcock and I fitted a long hose with a taper point that fits any size fuel line. So I could run and engine as long as I wanted. When finished the carbs were always full.

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post #15 of 18 (permalink) Old 12-18-2013, 3:07 PM
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Re: easy way to get gas into carbs after rebuild for sync

Good insight and enginuity I will need alternative fuel source soon also....
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post #16 of 18 (permalink) Old 12-18-2013, 5:19 PM
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Re: easy way to get gas into carbs after rebuild for sync

my mid-70's Brown Gold coffee can.....long clear hose with universal fitting plugs into carb inlet hose. I can hang it from rafters or handlebar, use it for bench testing too.

Also have an old plastic lawn mower tank, can plug that directly into carb inlet hose, it can lay on the frame above carbs.

Either way...whatever it takes. Crude but works.

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Last edited by ducatiman; 6-15-2016 at 8:48 PM.
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post #17 of 18 (permalink) Old 12-23-2013, 10:51 AM
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Re: easy way to get gas into carbs after rebuild for sync

I use an old gpz500 coolant bottle
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post #18 of 18 (permalink) Old 12-28-2013, 6:13 AM
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Re: easy way to get gas into carbs after rebuild for sync

I use an old washing up bottle, with a hose that fits on the end and i just shove it inside my stock fuel hose.

Worked fine for me yesterday
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