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post #1 of 6 (permalink) Old 05-17-2017, 12:15 PM Thread Starter
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More newb problems

Murica 02.
Finally got it all firing and happy, decided to balance the carbs. Warmed it up and plugged in the vacuum gauge I got from Squaredeals.. First time I've tried this myself.
Tiny image is tiny, but this is where both needles bounce between;


Big red section reads "late valve timing or leak in intake" so I'd guess there's a hint - While idling it did repeatedly speed up and slow down. I know the WD40 trick for the intake rubbers and airbox. (Valve timing was done at service last November, I doubt that's the problem.)
I did attempt to dampen, pretty much did nothing.

So I'm going to the shops and then I'll get some WD40 on these rubbers (Which looked fine when I rejetted, I had them both out in the light to look for any obvious wear..)
Any other thoughts? Suggestions?
Seems odd to me that it'd be both carbs giving me this.. But my drawing board is still comparatively fresh.

Got some mod's planned for when I'm finally making money again.
Starting with taking out that ugly airbox and relocating the battery. Progressive suspension and some 8-9" apes too.
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post #2 of 6 (permalink) Old 05-17-2017, 12:47 PM
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That's probably normal, needs dampening. Get yourself a 6'' long piece of stranded electric wire, 10 or 12 gauge, cut the hose to the gauge and join it back together with the hose. If the wire doesn't fit snug wrap the ends with tape to fatten it up to fit snug. Wire may need to be a little longer or shorter to reduce the needle bounce to a readable level. How did you dampen it?
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post #3 of 6 (permalink) Old 05-17-2017, 01:14 PM
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1) DO NOT concern yourself with the markings on that vacuum gauge!
2) That vacuum gauge is for automotive applications......a single gauge is not the tool for your job, you need one for each cylinder.
3) With 2 gauges you are looking for the needles to read approximately the same at WARM IDLE.
4) The wide swings of the needle reading can be controlled with a simple flow valve from an aquarium supply.
https://premiumaquatics.com/products...FYKKswodlIgJQQ
These or similar valves will enable you to "damp" the vacuum pulses to a readable level. There is no need to "dampen" anything, moisture will have no effect on your process.

Rex

Last edited by Bjorn Toulouse; 05-17-2017 at 01:15 PM. Reason: speelage
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post #4 of 6 (permalink) Old 05-17-2017, 01:24 PM Thread Starter
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Quote:
Originally Posted by rweb View Post
How did you dampen it?
Having eaten a decent meal now, and gone for a walk to think I come to the conclusion that I was a moments fool and will not explain what I actually did.

Quote:
Originally Posted by Bjorn Toulouse View Post
1) DO NOT concern yourself with the markings on that vacuum gauge!
2) That vacuum gauge is for automotive applications......a single gauge is not the tool for your job, you need one for each cylinder.
3) With 2 gauges you are looking for the needles to read approximately the same at WARM IDLE.
4) The wide swings of the needle reading can be controlled with a simple flow valve from an aquarium supply.
https://premiumaquatics.com/products...FYKKswodlIgJQQ
These or similar valves will enable you to "damp" the vacuum pulses to a readable level. There is no need to "dampen" anything, moisture will have no effect on your process.

Rex
I'm feeling much less concerned now.
It's okay though, it does feature two - Just wanted a little picture. c:
Well now I see that and am able to brain, the set did come with two little plastic valves. I just looked at them and went "Heh?" and left them in the box.

So all I gotta do is chop each cable in half, stick the valves in the middle and go again, damping as needed, right?
Cheers guys

Got some mod's planned for when I'm finally making money again.
Starting with taking out that ugly airbox and relocating the battery. Progressive suspension and some 8-9" apes too.
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post #5 of 6 (permalink) Old 05-17-2017, 11:41 PM
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Quote:
Originally Posted by Bjorn Toulouse View Post
1) DO NOT concern yourself with the markings on that vacuum gauge!
2) That vacuum gauge is for automotive applications......a single gauge is not the tool for your job, you need one for each cylinder.
3) With 2 gauges you are looking for the needles to read approximately the same at WARM IDLE.
4) The wide swings of the needle reading can be controlled with a simple flow valve from an aquarium supply.
https://premiumaquatics.com/products...FYKKswodlIgJQQ
These or similar valves will enable you to "damp" the vacuum pulses to a readable level. There is no need to "dampen" anything, moisture will have no effect on your process.

Rex


+1 on this - ignore the gauge markings, just make sure both sides are the same and you're good to go.


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post #6 of 6 (permalink) Old 05-18-2017, 09:24 AM
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If the fluctuation is as large as you say, it can be reduced by restricting the hose size as previously mentioned. I put some small pieces of foam from some old earplugs in the lines to each gauge to get the needle bounce down to where I could read the numbers.

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