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WintrSol
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« on: September 01, 2023, 12:19:06 PM » |
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I was looking at the diagrams at Partzilla and noticed something I hadn't before. On the diagram showing the 'manifolds' (intake runners), there are three 'boost caps' for the vacuum ports, one on one side, two on the other. As I understand it, the PAIR system would normally connect to all six ports, so what are these caps for? And, since I only use them for sync, can I use them for if/when the capped tube that came with my sis-channel electronic sync gauge fail? They are #6 on this page: https://www.partzilla.com/catalog/honda/motorcycle/1998/gl1500ct-a-valkyrie-tourer/cylinder-head |
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98 Honda Valkyrie GL1500CT Tourer
Photo of my FIL Jack, in honor of his WWII service
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Pluggy
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« Reply #1 on: September 01, 2023, 12:53:32 PM » |
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Except California Valkyrie.... As Honda built them, there are caps on the intake tube "nipples" at cylinders 1, 2 and 5. The vacuum hoses for the PAIR system attach to the nipples at cylinders 3 and 4. The vacuum hose going to the fuel valve goes to cylinder 6.
it is my understanding that the fittings on a California model all have a vacuum line attached. The hose at #6 is still used for the fuel valve,
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« Last Edit: September 01, 2023, 12:55:53 PM by Pluggy »
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RonW
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« Reply #2 on: September 01, 2023, 01:22:59 PM » |
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Guess you don't need them on your model bike. Perhaps think about desmogging since the tubes are over 20 years old.  |
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2000 Valkyrie Tourer
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Jess from VA
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« Reply #3 on: September 01, 2023, 03:38:41 PM » |
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That looks like the good Honda vacuum cap.
My experience with the run of the mill auto parts package of vacuum caps was that they self destructed (blew off or blew in two) in no time, and gave me loud backfires on decell. Junk.
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Jims99
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« Reply #4 on: September 02, 2023, 05:11:37 AM » |
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The cheap ones dry out and crack very easily. I’ve been using red eyes caps with no issues.
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The light at the end of the tunnel, is a train.
99 tourer
00 interstate
97 standard
91 wing
78 trail 70
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WintrSol
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« Reply #5 on: September 02, 2023, 11:42:12 AM » |
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Except California Valkyrie.... As Honda built them, there are caps on the intake tube "nipples" at cylinders 1, 2 and 5. The vacuum hoses for the PAIR system attach to the nipples at cylinders 3 and 4. The vacuum hose going to the fuel valve goes to cylinder 6.
it is my understanding that the fittings on a California model all have a vacuum line attached. The hose at #6 is still used for the fuel valve,
As with much of the service manual, those connections unclear. I can look back at it now, with more educated eyes. Mine came de-smogged, but with all the parts; I didn't count the hoses. Thanks to all Rick |
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98 Honda Valkyrie GL1500CT Tourer
Photo of my FIL Jack, in honor of his WWII service
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sandy
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« Reply #6 on: September 02, 2023, 01:03:25 PM » |
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Guess you don't need them on your model bike. Perhaps think about desmogging since the tubes are over 20 years old. If you unscrew the nipp;e and match it up with a short bolt, you can eliminate the self destructive nipple system. I kept them in a ziplock under the seat in case of a sync job. |
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Jess from VA
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« Reply #7 on: September 02, 2023, 02:48:35 PM » |
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That is an excellent idea.  After your bike is all tuned, synched and dialed in, it's not like you need those ports for a long time. |
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RonW
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« Reply #8 on: September 02, 2023, 07:23:34 PM » |
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I would spray the plastic bag that you store the nipples in with some kind of florescent paint because those are the kind of things that you forget where you put them. I never quite got around to replacing the the nipples yet.  A little history, earlier Goldwings used bollts (21, below).  |
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2000 Valkyrie Tourer
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Jess from VA
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« Reply #9 on: September 03, 2023, 11:12:59 AM » |
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Ron, are you saying those Gold Wing nuts (21's; screw pan 5 X 8) fit the Valk intake nipple holes?
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RonW
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« Reply #10 on: September 03, 2023, 11:33:11 AM » |
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I guess any 5mm screw the right length should fit. It's how they use to do it based on the fiche.
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2000 Valkyrie Tourer
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Flyingfree
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« Reply #11 on: May 04, 2026, 12:20:46 PM » |
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I guess any 5mm screw the right length should fit. It's how they use to do it based on the fiche.
Now there's a thought, just unscrew the nipple out of the fitting and put in a screw with good sealant. Why bother capping the tube I'll never use again. |
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WintrSol
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« Reply #12 on: May 04, 2026, 12:44:57 PM » |
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I guess any 5mm screw the right length should fit. It's how they use to do it based on the fiche.
Now there's a thought, just unscrew the nipple out of the fitting and put in a screw with good sealant. Why bother capping the tube I'll never use again. You don't intend to sync the carbs again, even though the adjustments are mechanical and subject to change from vibration? |
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98 Honda Valkyrie GL1500CT Tourer
Photo of my FIL Jack, in honor of his WWII service
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Chrisj CMA
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« Reply #13 on: May 04, 2026, 01:20:21 PM » |
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Valkyries have (as stock) three vacuum lines connected to intakes and three intakes capped. The PAIR system connects ONLY to #3 & 4. #6 to petcock and the other three capped
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mello dude
Member
Posts: 1008
Half genius, half dumazz whackjob foole
Dayton Ohio
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« Reply #14 on: May 04, 2026, 02:26:08 PM » |
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Isn't that something the Redeye pair removal kit supplies? I did mine a few years back, now I gotta go look...  |
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* There's someone in my head, but it's not me.......
* Mr. Murphy was an optimist....
* There's a very fine line between Insanity and Genius.....
* My get up and go, must have got up and went.....
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John97
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« Reply #15 on: May 04, 2026, 03:06:35 PM » |
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I’m curious, why would these caps blow off and cause problems? I get that missing caps would cause issues, no doubt. But they are vacuum caps…on vacuum ports…that suck air in if uncapped. There’s a constant draw on them with the engine on. How do they blow off?
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Sixgunluvr
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« Reply #16 on: May 04, 2026, 09:33:45 PM » |
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I really like the caps supplied when purchasing my Digisync…they seem heavy duty and even better than the originals on my bike.  |
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« Last Edit: May 04, 2026, 09:43:09 PM by Sixgunluvr »
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98valk
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« Reply #17 on: May 05, 2026, 09:05:57 AM » |
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I used #3 allen head 5mm x 0.8mm screws to replace the fittings.
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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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