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Offline robdrobd

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Maiden Voyage, have questions.
« on: August 26, 2011, 04:57:11 PM »
Accelerated well, shifted through gears, but... Oh first. It is  76K model with velocity stacks, Mac 4 into 1, 120 mains. Seems to run well except for the noise. I sounds louder than hell in the front of the bike. As if the muffler were under the handle bars. Could it be the exhaust gaskets? Would that make it so much louder? I am taling machine gun/Harley straight shot loud, or is that how it should sound with stacks and the Mac. I have never had either so I am not sure.
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Offline madmtnmotors

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Re: Maiden Voyage, have questions.
« Reply #1 on: August 26, 2011, 05:06:20 PM »
I've never run the vel stacks, but my Mac 4 into 1 is a little loud for my taste, although stock 4 into 4 are too expensive for my taste. I'm sure the stacks will add more noise. I think Dennis Kirk has baffles for the Macs that I might try. Others will likely know more about sound levels with the velocity stacks.
Enjoy the ride!
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TAMTF...


Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

Sent from my Tandy TRS-80!

Offline robdrobd

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Re: Maiden Voyage, have questions.
« Reply #2 on: August 26, 2011, 05:08:25 PM »
Could a worn or poorly seated exhaust gasket cause a lot of noise?
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Offline robdrobd

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Re: Maiden Voyage, have questions.
« Reply #3 on: August 26, 2011, 05:17:51 PM »
It seemed to happen more on deceleration.
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Offline WarwickE36

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Re: Maiden Voyage, have questions.
« Reply #4 on: August 26, 2011, 05:20:04 PM »
perhaps its the goblin on your bike?
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You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
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 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

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Offline robdrobd

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Maiden Voyage, have questions.
« Reply #5 on: August 26, 2011, 05:26:02 PM »
Uh, what?
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Offline madmtnmotors

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Re: Maiden Voyage, have questions.
« Reply #6 on: August 26, 2011, 06:09:03 PM »
Which 76K? 750, 550, 350? Are the spigots still used with the clamps, or are the header pipes flanged with studs (or bolts)? Either way, the copper crush gaskets are cheap and easy to replace (cheap insurance). It's also easy to overlook the old copper gaskets when installing new ones and the resulting "stack" of gaskets can be more prone to leak. Pull the pipes, make sure all traces of old copper gaskets are removed, and put new gaskets in. After having done it a couple of times any shade-tree mechanic should be able to complete the job in 45 minutes. If you have a steady hand you could move your fingers around the pipe connection at the head while the bike is running to feel for leaks, watch out though, those pipes get hot!

I've still got the scar to prove it...
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TAMTF...


Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

Sent from my Tandy TRS-80!

Offline robdrobd

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Re: Maiden Voyage, have questions.
« Reply #7 on: August 26, 2011, 06:40:59 PM »
Yeah, I have a fairly strong puff of air coming out between number 1and 2. Guess I need to tear it off and check the gaskets.
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Offline robdrobd

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Re: Maiden Voyage, have questions.
« Reply #8 on: August 26, 2011, 06:41:40 PM »
Its a 750 by the way
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Offline pknopp

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Re: Maiden Voyage, have questions.
« Reply #9 on: August 26, 2011, 08:05:29 PM »
 My 4 into 1 makes all sorts of noise. There is no missing it coming down the road.
 
 
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Offline robdrobd

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Maiden Voyage, have questions.
« Reply #10 on: August 27, 2011, 01:06:58 PM »
Fixed, one of the exhaust bolts on the #2 was seated poorly. I retapped it and now she purrs like a kitten. I can't believe the noise from one small exhaust leak.
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