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Paladin528
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« on: September 10, 2015, 05:04:09 AM » |
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Ok I have a new issue and I think I know the answer but input would be welcomed as to where to start.
This morning I put a full tank of gas in the fat lady and headed out to work. It is a cool morning but no "Cold"
When I stopped at a light sitting there I notice my idle had increased to around 1250rpm. I gave the throttle a blip and it settled back to 900 rpm but is wavering (it has always wavered a bit but I have only owned it since Spring) it then crept back up a bit.
I also noticed that when I blip the throttle it takes a little longer to settle taking a few seconds to slow down. (clutch in and stopped)
I am leaning towards a Vacuum leak but not sure where to start. All of the carb boots are secure and tight.
So... I am thinking maybe intake runner o-rings, vacuum lines.
Anything else I should look at?
No, it has not been desmogged and I was waiting for the end of the season to tackle that.
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Pete
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« Reply #1 on: September 10, 2015, 05:18:49 AM » |
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As you surmised an intake or vacuum leak would be my first check.
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old2soon
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« Reply #2 on: September 10, 2015, 08:42:19 AM » |
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If it HAS NOT been desmogged you have a rat warren of vacuum lines under the air box. And the heat cool cycles dry out the hoses. If you can't legally desmog replace vacuum lines with a high quality silicone lines. RIDE SAFE.
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Today is the tommorow you worried about yesterday. If at first you don't succeed screw it-save it for nite check. 1964 1968 U S Navy. Two cruises off Nam.
VRCCDS0240 2012 GL1800 Gold Wing Motor Trike conversion
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98valk
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« Reply #3 on: September 10, 2015, 09:36:23 AM » |
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check the rubber caps on the intake manifolds, a known problem.
silicon is not the best material to use.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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Paladin528
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« Reply #4 on: September 10, 2015, 09:41:53 AM » |
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Ok since we are all in agreement. What is the best vacuum line to use? I was going to go with the Silicone lines (actually was gonna do red ones to match the paint).
What are the thoughts on what to use and the best place to procure, preferably in Canada.
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #5 on: September 10, 2015, 10:18:07 AM » |
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My thoughts concern the throttle cables and the adjustments. When working the throttle you should hear the cables 'snap' to the stop which is just to the rear the idle speed adjuster.
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Paladin528
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« Reply #6 on: September 10, 2015, 10:30:37 AM » |
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Throttle operation is normal. Even if I twist the throttle forward and "pull" the throttle to the stop the same thing happens.
like I said in the first post If I blip the throttle it slowly recovers to 900 rpm then will drift up to 1250 or so and just wobble around there. not a stable idle either it is +- 50 rpm.
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98valk
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« Reply #7 on: September 10, 2015, 12:29:22 PM » |
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Ok since we are all in agreement. What is the best vacuum line to use? I was going to go with the Silicone lines (actually was gonna do red ones to match the paint).
What are the thoughts on what to use and the best place to procure, preferably in Canada.
silicone is actually great if the following are avoided Generally, silicones are attacked by most concentrated solvents, oils, acids and dilute sodium hydroxide. look for a chart for its resistance to gasoline and more properties. |
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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MarkT
Member
Posts: 5196
VRCC #437 "Form follows Function"
Colorado Front Range - elevation 2.005 km
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« Reply #8 on: September 10, 2015, 12:37:52 PM » |
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If my Tourer ever gets here, on my list of mods is, desmog. I'm going to plug the runner nipples differently this time. This thread made me think, why shouldn't I just use a blob of silicon Goop, that all-purpose adhesive and glue? I've used it a lot to do things like attach LED fixtures to the bike - Seems a blob of that on the nipples, would stay in place, wouldn't crack, and would be easy to remove when I want to sync the carbs. Why not?
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Steve K (IA)
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« Reply #9 on: September 10, 2015, 12:57:34 PM » |
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Do you have the stock petcock? Have you replaced the cover set? The vacuum leak could be there.
My I/S had the same symptoms. Was convinced I had a vacuum leak. Changed the vac hoses that go from the pair valve and split off to the 2 intake runners. In 16 seasons, they still looked new. Not brittle, no cracks and no holes. I replaced them anyway. I replaced the intake runner o-rings a few years ago...checked them, they looked new and no apparent signs leaking but did have a new set of o-rings and replaced them anyway. Put the tank on and was going to use my new Digi Sync to sync the carbs and couldn't get vacuum to hold at the petcock. Apparently the diaphragm has a hole or tear in it. I haven't torn into it yet, the cover set is to come yet today. But that has to be where my problem is.
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 States I Have Ridden In |
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old2soon
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« Reply #10 on: September 10, 2015, 01:15:36 PM » |
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If my Tourer ever gets here, on my list of mods is, desmog. I'm going to plug the runner nipples differently this time. This thread made me think, why shouldn't I just use a blob of silicon Goop, that all-purpose adhesive and glue? I've used it a lot to do things like attach LED fixtures to the bike - Seems a blob of that on the nipples, would stay in place, wouldn't crack, and would be easy to remove when I want to sync the carbs. Why not?
Mark-Attic Rat uses brass threaded plugs where you are talikn bout putting the goop. Just throwin it out there as an F Y I. RIDE SAFE. |
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Today is the tommorow you worried about yesterday. If at first you don't succeed screw it-save it for nite check. 1964 1968 U S Navy. Two cruises off Nam.
VRCCDS0240 2012 GL1800 Gold Wing Motor Trike conversion
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98valk
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« Reply #11 on: September 10, 2015, 01:22:08 PM » |
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If it HAS NOT been desmogged you have a rat warren of vacuum lines under the air box. And the heat cool cycles dry out the hoses. If you can't legally desmog replace vacuum lines with a high quality silicone lines. RIDE SAFE.
how are your silicone lines holding up? I remember yrs ago somebody had them and they didn't last more than 1 yr. maybe they used low quality hence u saying high quality. |
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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old2soon
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« Reply #12 on: September 10, 2015, 03:16:54 PM » |
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If it HAS NOT been desmogged you have a rat warren of vacuum lines under the air box. And the heat cool cycles dry out the hoses. If you can't legally desmog replace vacuum lines with a high quality silicone lines. RIDE SAFE.
how are your silicone lines holding up? I remember yrs ago somebody had them and they didn't last more than 1 yr. maybe they used low quality hence u saying high quality. I myself have done the desmog on my Phatt Ghurl.  RIDE SAFE. |
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Today is the tommorow you worried about yesterday. If at first you don't succeed screw it-save it for nite check. 1964 1968 U S Navy. Two cruises off Nam.
VRCCDS0240 2012 GL1800 Gold Wing Motor Trike conversion
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Paladin528
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« Reply #13 on: September 10, 2015, 03:25:07 PM » |
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I just gave a suck on the peacock vacuum line. Guess what. It does not hold vacuum. I will order the cover set tomorrow and start there.
I wouldn't mind doing the rest anyway but now I may be able to wait a bit
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98valk
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« Reply #14 on: September 10, 2015, 05:05:12 PM » |
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« Last Edit: September 12, 2015, 08:40:55 AM by CA »
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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Paladin528
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« Reply #15 on: September 11, 2015, 09:56:26 AM » |
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Ok so I priced the intake runner o rings at my local Honda dealer. $8 bucks Canadian a piece. A little steep for an o ring.
I know some have posted aftermarket replacements but I can't find it. Please post a link.
I am also looking for a cover set for the petcock if I can find one cheaper
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Steve K (IA)
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« Reply #16 on: September 11, 2015, 10:41:14 AM » |
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O-rings....
Advance Auto Parts
part # 64628.1 $1.59 ea. size 28mm x 34mm x 3mm
or
Check your hardware stores or farm stores for this size.
--------------------------------------------------------------------
For petcock.
Partzilla.com 16953-MBZ-B51 COVER SET,rooster $28.84 before shipping charge.
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« Last Edit: September 11, 2015, 11:02:14 AM by Steve K (IA) »
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States I Have Ridden In |
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The emperor has no clothes
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« Reply #17 on: September 11, 2015, 11:46:22 AM » |
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If you are going to get the o-rings at a hardware or auto store make sure they are viton not silicone. I would recommend Redeye for them. And on your cover set get the OEM some have had issues with the K&L.
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Paladin528
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« Reply #19 on: September 13, 2015, 10:18:50 AM » |
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thats the one. Thanks a million. Ordered....
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