1988 GL1500 leaks fuel - Page 5 - Steve Saunders Goldwing Forums

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post #41 of 51 (permalink) Old 04-29-2017, 04:47 PM
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The vacuum is what it is.
The restricters are to smooth vacuum pulses not reduce vacuum.

Advise given here is free and comes with no warranty "Caveat emptor"

Ken.
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post #42 of 51 (permalink) Old 04-29-2017, 04:57 PM Thread Starter
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Originally Posted by Ken Bergen View Post
The vacuum is what it is.
The restricters are to smooth vacuum pulses not reduce vacuum.
Yes-I guess I knew that already. Just surprised at the high reading. Not sure if I can do a proper balance with the carbtune if it's pegged.
Maybe just do a homemade job or I'll get some cheap vac guages...
Any thoughts on the pistons?

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post #43 of 51 (permalink) Old 04-29-2017, 05:12 PM
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post #44 of 51 (permalink) Old 04-29-2017, 05:51 PM
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Originally Posted by wingsam41 View Post
Not sure if I can do a proper balance with the carbtune if it's pegged.
What do you mean by "pegged"?

Advise given here is free and comes with no warranty "Caveat emptor"

Ken.
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post #45 of 51 (permalink) Old 04-29-2017, 05:59 PM Thread Starter
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What do you mean by "pegged"?
The indicating rods-of the carbtune- go up to the top with bike running. Looks like 2 mercury thermometers at max temperature indication.

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post #46 of 51 (permalink) Old 05-03-2017, 05:49 AM Thread Starter
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On a side note here I would like to point out a quick opinion before my carb pistons arrive later today and hopefully solve this issue. I like to use OEM parts as much as anyone but sometimes OEM design is just inferior-aftermarket suspension parts are a good example of this. The OEM Honda heat mat idea just seems poorly designed or a maybe was a quick fix for an issue that popped up after the bike was released. I would be interested to see a list of recalls or service bulletins from Honda to see if any relate to this heat mat.
Anyway after removing the old mat to get to the vacuum lines beneath it was evident I would not be re-using the old part and cannot justify spending $60 on a small sheet of rubber-seems ridiculous. Seems to be 2 schools of thought on the forum on this. Some saying you need it. Some saying you don't. Some saying only in desert climate. Here's my compromise. I found this on amazon. It's rubber matting that hair salons use for laying hot curling irons on. I've cut the carb holes in it already (will add extra holes for coolant and drains etc.) and it fits pretty good with the four corners needing to get tucked under the frame. It cuts easily with a razor and is rated for 600 degrees. I plan to install upside down so the intended hot side of the mat faces the hot engine and the cool side faces the carb bowls:
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post #47 of 51 (permalink) Old 05-03-2017, 06:51 AM
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Originally Posted by wingsam41 View Post
I found this on amazon. It's rubber matting that hair salons use for laying hot curling irons on. I've cut the carb holes in it already (will add extra holes for coolant and drains etc.) and it fits pretty good with the four corners needing to get tucked under the frame. It cuts easily with a razor and is rated for 600 degrees. I plan to install upside down so the intended hot side of the mat faces the hot engine and the cool side faces the carb bowls:
Great idea! It looks like the material the mat is made out of is silicone. I also found sheets of black silicone at Amazon in both 1/16" and 1/8" thicknesses, with a very low durometer (which makes it very flexible).

https://www.amazon.com/Silicone-Duro...silicone+sheet
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post #48 of 51 (permalink) Old 05-03-2017, 07:04 AM
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That seems like a good and inexpensive alternative to the oem mat. Should be adequate for the purpose.

Larry

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post #49 of 51 (permalink) Old 05-03-2017, 07:34 AM
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I used my old torn mat as a pattern to cut one out of an old tire tube that the tire shop gave me for free. It felt almost identical to the material the heat mat was made from. That's about as inexpensive as you can get.
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post #50 of 51 (permalink) Old 05-03-2017, 09:33 PM Thread Starter
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At a loss 🙁
New pistons installed and the problem persists.
Really wishing I had simply run a case of seafoam through this thing before touching the carbs...

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