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arse21
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« on: July 09, 2022, 06:09:54 PM » |
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Good day, good people
I have a 97 Valk standard, new to me last year. I just bought a cobra 6/6 to replace my OEM exhaust. I got new gaskets and installed today. The left side is completely and utterly fine. The right side, however, POPpopPoPopBangPop! I will say in advance, the right side had a slight pop even with OEM and burned blue out of the right side exhaust. One of the previous owners dropped the bike on the right side pretty good, I don't know what impact that has had on my girl, Shiva.
I just tried a second attempt to remove and replace the pipes after realizing I over torqued header acorn nuts, misaligned some headers to adjust for the rear bracket which didn't want to fit the mounts, tugging on the pipes backwards... It isn't popping AS badly in idle / decel from revving (though I didn't take it for a ride as it's dark now) and it is still popping a lot. I did notice an exhaust leak from the middle right, and the first and last pipes are the ones popping at idle. I want to try again...
I am going to get another set of gaskets before I try a third time. However, as this is the first mod to any motorcycle I have owned, before I continue...does any of this resound with anyone? Am I being a lunatic / idiot? Or is fuel mix / rejetting coming into this equation as well?
SOS - Send HELP!
Thanks much,
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Valker
Member
Posts: 2995
Wahoo!!!!
Texas Panhandle
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« Reply #1 on: July 09, 2022, 06:33:28 PM » |
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Are you 100% sure you removed the old gaskets before adding a new one?
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I ride a motorcycle because nothing transports me as quickly from where I am to who I am.
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arse21
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« Reply #2 on: July 09, 2022, 06:44:03 PM » |
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Are you 100% sure you removed the old gaskets before adding a new one?
All 6 with Dentist pick. They didnt look bad...but replaced anyway. Cut side downwind too |
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Valker
Member
Posts: 2995
Wahoo!!!!
Texas Panhandle
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« Reply #3 on: July 09, 2022, 06:59:46 PM » |
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Check vacuum lines then. Vacuum leaks is the #1 cause of decel popping.
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I ride a motorcycle because nothing transports me as quickly from where I am to who I am.
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Pappy!
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« Reply #4 on: July 09, 2022, 07:04:13 PM » |
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If it is sitting there popping at an idle I would definitely check and reset your idle fuel mixtures on that side. should help a bunch. Also a carb sync sounds like it may be in order as well.
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arse21
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« Reply #5 on: July 09, 2022, 07:29:13 PM » |
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If it is sitting there popping at an idle I would definitely check and reset your idle fuel mixtures on that side. should help a bunch. Also a carb sync sounds like it may be in order as well.
While I have my Clymer manual for the Valk, I'm here out of my naivety with this bike...any good link / video here? Appreciate the help! |
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mello dude
Member
Posts: 944
Half genius, half dumazz whackjob foole
Dayton Ohio
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« Reply #6 on: July 10, 2022, 04:28:46 PM » |
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I would go through several heat cycles, and recheck torque after cool downs before doing anything radical.....the clue is the other side seems fine.... Then also, very typical when going to an after market exhaust....you'll get some pop,pop from the pair valve system shooting air into the exhaust and getting burn off pop.....then consider deleting the pair system.. More beer induced thoughts....are you installing the exhaust gaskets correctly? Best way is to smear grease on them, set in position....so they stay put..(it will burn off, no matter)....then move the header into position.....seemingly you have a gasket interface alignment issue.....slooooow down.....take good deep breaths and double check everything before you start to torque it down....then sneak up on each bolt little by little....(dont try to go all at once on each nut..)....what kind of torque wrench are you using? So, do the simple stuff first, if it doesn't work, then you gotta go deeper....  Btw....get a factory manual! |
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« Last Edit: July 10, 2022, 05:16:07 PM by mello dude »
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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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old2soon
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« Reply #7 on: July 10, 2022, 06:27:38 PM » |
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Check ALL the carb clamps. Air filter stock or after market? No matter is it Clean? Is the air box installed correctly? Put your location in yer avatar someone May reside close to you with a digisync. You do have wrench help show up Good BBQ and icy cold adult beverages go a long way!  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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Chrisj CMA
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« Reply #8 on: July 11, 2022, 05:19:02 AM » |
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The best way to install Cobra pipes is to take them apart. Do one pipe at a time. Easy to make sure the flange is square with the head. Snug but not tight until all three are on, connected in the back and mounting bolts on. Then tighten everything
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arse21
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« Reply #9 on: July 11, 2022, 11:31:31 AM » |
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I would go through several heat cycles, and recheck torque after cool downs before doing anything radical.....the clue is the other side seems fine.... Then also, very typical when going to an after market exhaust....you'll get some pop,pop from the pair valve system shooting air into the exhaust and getting burn off pop.....then consider deleting the pair system.. More beer induced thoughts....are you installing the exhaust gaskets correctly? Best way is to smear grease on them, set in position....so they stay put..(it will burn off, no matter)....then move the header into position.....seemingly you have a gasket interface alignment issue.....slooooow down.....take good deep breaths and double check everything before you start to torque it down....then sneak up on each bolt little by little....(dont try to go all at once on each nut..)....what kind of torque wrench are you using? So, do the simple stuff first, if it doesn't work, then you gotta go deeper.... Btw....get a factory manual! Thanks for the thoughts! I have new gaskets on the way so I will be doing just this again this weekend, easy does it. I tried again yesterday but likely having misaligned gaskets from the first time...well...nothing changed. And yes I greased them to keep them in place but will certainly take my time. I asked the New England chapter about carb help too for when I get to that. I'm pretty sure the right side needs some tweaking regardless. Thanks! |
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arse21
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« Reply #10 on: July 15, 2022, 02:01:10 PM » |
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So I put new gaskets in, easy does it tightening...and I still have popping at idle, under 30mph stable speed, and any decel. Called a mechanic and he said rejet. Has anyone else had experience with rejetting and how arduous a task is it?
Edit: While I have tinkered with single carbs for cars...would anyone have a good link to just adjusting for fuel mixture adjustment? I've perused a ton of threads here and haven't found a good concise thread for someone ignorant to busting open 3 carbs to adjust...Forgive my naivety!
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« Last Edit: July 15, 2022, 03:46:48 PM by arse21 »
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mello dude
Member
Posts: 944
Half genius, half dumazz whackjob foole
Dayton Ohio
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« Reply #11 on: July 15, 2022, 06:17:31 PM » |
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What I don't get is popping on one side and not the other........now it's a rejet?
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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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cookiedough
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« Reply #12 on: July 15, 2022, 06:25:09 PM » |
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about 2 years ago BigBF fixed my 98 tourer LOUD LOUD POP POP POP prior by taking apart the carbs redoing what needs redone (seals, carb kit, etc.), retightening the loose header nuts, total synching of carbs, and now runs very well NO (not once) POP POP POP at all now, runs like new and faster.
He had all those tiny parts of the carb layed out on paper towels like he was a surgeon. He did tell me he really did not want to do another total carb rebuild seems like lately that is all he has been doing, but he got er'dun. Oh yah, as mentioned prior a few rubber intake boots were cracked as well so replaced all while doing carbs while all apart.
Too bad we lost him to stupid COVID and he was pretty afraid of catching it during the time he was hear during the timeframe of the Trump/Biden debates. BIG GO TRUMP supporter had a sign in his portable rig to prove it.
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Valkorado
Member
Posts: 10491
VRCC DS 0242
Gunnison, Colorado (7,703') Here there be twisties.
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« Reply #13 on: July 15, 2022, 06:48:14 PM » |
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about 2 years ago BigBF fixed my 98 tourer LOUD LOUD POP POP POP prior by taking apart the carbs redoing what needs redone (seals, carb kit, etc.), retightening the loose header nuts, total synching of carbs, and now runs very well NO (not once) POP POP POP at all now, runs like new and faster.
He had all those tiny parts of the carb layed out on paper towels like he was a surgeon. He did tell me he really did not want to do another total carb rebuild seems like lately that is all he has been doing, but he got er'dun. Oh yah, as mentioned prior a few rubber intake boots were cracked as well so replaced all while doing carbs while all apart.
Too bad we lost him to stupid COVID and he was pretty afraid of catching it during the time he was hear during the timeframe of the Trump/Biden debates. BIG GO TRUMP supporter had a sign in his portable rig to prove it.
The travelling Valk whisperer. He's sorely missed already. I'm afraid the more we and our bikes age, the more he will be missed. I doubt I coulda got him back up to the altitude again, especially not during a smoky wildfire year but I'd have ridden to a neighboring state to see him again. I'd forgotten all about the altitude/acclimation scenario, I was just so excited to have him come up. He was hurting but manned it out like a warrior. We were buying him pressurized cans of O2 at Wally World, they came with a mask built into the can. He sucked down a handful in the couple days he was here. He was a fun, talented dude. |
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Have you ever noticed when you're feeling really good, there's always a pigeon that'll come sh!t on your hood? - John Prine 97 Tourer "Silver Bullet" 01 Interstate "Ruby"  |
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Craig9409
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« Reply #14 on: July 17, 2022, 06:27:28 AM » |
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I would go through several heat cycles, and recheck torque after cool downs before doing anything radical.....the clue is the other side seems fine.... Then also, very typical when going to an after market exhaust....you'll get some pop,pop from the pair valve system shooting air into the exhaust and getting burn off pop.....then consider deleting the pair system.. More beer induced thoughts....are you installing the exhaust gaskets correctly? Best way is to smear grease on them, set in position....so they stay put..(it will burn off, no matter)....then move the header into position.....seemingly you have a gasket interface alignment issue.....slooooow down.....take good deep breaths and double check everything before you start to torque it down....then sneak up on each bolt little by little....(dont try to go all at once on each nut..)....what kind of torque wrench are you using? So, do the simple stuff first, if it doesn't work, then you gotta go deeper.... Btw....get a factory manual! I second the last line of this... Get the factory manual. The after market manuals are poor. The factory Valk manual is one of the best service manuals I have ever read, and worth what you have to pay. I picked up a used one on E-bay for $16.00. New they run ~$160.00. It is well illustrated and easy to find what you are looking for. For some reason, your air/fuel mix is a bit off on the right bank. If the exhaust turns out to be sealed, You'll need to look for vacuum leaks. Then look at the air box boots. Barring that, do a sync. After market exhausts do change the air fuel mix. I wish I had better answers. It's going to be a tinkering resolution. The stock vacuum hoses get hard and crack from age. Unless you dig in, you can't see them good enough from outside, There is a budget smoke machine on Amazon here https://www.amazon.com/AutoLine-Pro-Automotive-Detector-Diagnostic/dp/B07JVT1NG2/ref=sr_1_5?crid=1NAH8EZVGPGR7&keywords=smoke+machine+automotive&qid=1658064347&sprefix=smoke+machine+%2Caps%2C140&sr=8-5&ufe=app_do%3Aamzn1.fos.18ed3cb5-28d5-4975-8bc7-93deae8f9840These can save you a lot of headaches chasing an occult vacuum leak. Good luck! |
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« Last Edit: July 17, 2022, 06:30:44 AM by Craig9409 »
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gordonv
Member
Posts: 5760
VRCC # 31419
Richmond BC
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« Reply #15 on: July 17, 2022, 12:57:51 PM » |
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There is how to diy your own vacuum smoker on youtube. service manual on Valkyrie Norway. http://valkyrienorway.com/download.htmlI still would go out and buy a paper copy, just something about paper when working on the bike. I research on the couch, but the paper in front and on trips on the bike. |
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1999 Black with custom paint IS   |
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turtle254
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« Reply #16 on: July 17, 2022, 01:52:51 PM » |
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Nobody has a paper copy out there!
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Pappy!
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« Reply #17 on: July 18, 2022, 07:03:53 PM » |
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I replied to your PM for you. Sorry I did not see it earlier.
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Mooskee
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« Reply #18 on: July 19, 2022, 07:04:25 AM » |
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Nobody has a paper copy out there!
I could hardly believe it. Not more than a year ago I purchased on on eBay for about $20. It looked like a bound photocopy. Now if you see one it is $100 or more. |
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Craig9409
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« Reply #19 on: July 19, 2022, 07:39:37 AM » |
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I guess I got lucky and looked on ebay at the right time. $16.00 plus mail.
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