Increased backfire/misfire
Hey guys, so recently went thought and changed out my OEM auto CCT's to Krieger Manual CCT's following this guide:
www.vtr1000.org • View topic - Manual Cam Chain Tensioner Installation Guide (MCCT's) Chain didnt jump any sprockets and i adjusted the CCT's to allow for ~6mm of slack on the chain under the chain guide. I also swapped out my plugs, instead of going with 8's i have 9's and as soon as i started it up and warmed up it seems to have a misfire at idle and a crazy backfire upon deceleration. Is it possible its the plugs completely causing this issue to act up? I will be swapping the old ones back in tonight but would like to know if anyone else has experienced this, maybe i need to loosen up the CCT's an 1/8th of a turn? Any advice is appreciated, thanks. |
Swap out the plugs. easy way to confirm things.
my thought is one of the cams may be one tooth off. can it rev? or does it back fire spit and cough at around ~5-7k rpm? that's what I was getting with 1 tooth off. |
Originally Posted by Caffeine
(Post 356872)
Swap out the plugs. easy way to confirm things.
my thought is one of the cams may be one tooth off. can it rev? or does it back fire spit and cough at around ~5-7k rpm? that's what I was getting with 1 tooth off. |
Originally Posted by bbancsov
(Post 356885)
Only time it is noticeable is at idle
Symptomatic of a vacuum tube that's disconnected. |
Originally Posted by zxbud
(Post 356910)
Symptomatic of a vacuum tube that's disconnected.
http://i58.photobucket.com/albums/g2...ps04f5c371.jpg I'm guessing the MCCT's are too tight? Should i back them off by an 1/8th of a turn? This is the only thing that has changed. |
I took the tank and airbox to doublecheck all my connections, all were good aside from this one below. It goes to the right side of the front carb and wasnt connected to anything, looks just like a breather line? Any ideas? I have a 2000 mile trip coming up at the end of the month and need to get this thing ready! Any and all help is appreciated.
http://i58.photobucket.com/albums/g2...psd1740e9c.jpg |
vacuum tube
pg. 87 6-12 in the VTR service manual www.vtr1000.org • View topic - VTR1000F (Superhawk) Firestorm Service Manual PDF |
It goes to the pair valve,if the pair valve has been removed just plug the hose with a screw.
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Originally Posted by zxbud
(Post 356910)
Symptomatic of a vacuum tube that's disconnected.
http://thumbs.dreamstime.com/z/antiq...ube-538512.jpg Sorry, back on topic... |
I'm going to do the PAIR delete mod this afternoon and see if the afterburn issue is resolved. Am i missing something in regards to that pic??
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An early version of the iphone used 1,500 vacuum tubes (non Honda) - probably a bit before your time, but it was hi-tech in its day and helped win the war ;-)
http://i.i.com.com/cnwk.1d/i/tim/201...bes-valves.jpg |
Did anyone else think of this right away? :D:D For future reference an overtingt camchain wont cause a backfire or misfire but the bike would struggle to turn over and you may get a squeaching sound a bit like the sound of a fan belt on a car slipping. (:-}) |
Originally Posted by Wolverine
(Post 357015)
Did anyone else think of this right away? :D:D
http://thumbs.dreamstime.com/z/antiq...ube-538512.jpg Sorry, back on topic... |
NO change after removing the PAIR system and flipping the reeds. Could this potentially be caused by the CCT's being too tight?
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Not trying to beat a dead horse here guys but i took a video that better describes the problem. It's the somehwhat "faint" popping sound while at idle, any advice is appreciated i'd like to get it resolved in the next week before i take the bike on a 2000 mile trip! Thanks
video-2013-06-23-15-15-27_zps2e01207c.mp4 Video by bbancsov300 | Photobucket |
Originally Posted by bbancsov
(Post 357558)
Not trying to beat a dead horse here guys
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Originally Posted by bbancsov
(Post 357558)
Not trying to beat a dead horse here guys but i took a video that better describes the problem. It's the somehwhat "faint" popping sound while at idle, any advice is appreciated i'd like to get it resolved in the next week before i take the bike on a 2000 mile trip! Thanks
video-2013-06-23-15-15-27_zps2e01207c.mp4 Video by bbancsov300 | Photobucket It sounds like it's idling too fast and the throttle sync is off. Did you plug that vacuum tube yet? Does it pump 165 psi in each cylinder cold crank pressure? It should sound like this one------ |
Yes i plugged that tube when i did the PAIR removal. Is there a way to resynch the throttle tubes? What baffles me is i didnt touch anything when doing the manual cct installation, and thats all thats changed. Nothing else.
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It's a Pain
Originally Posted by bbancsov
(Post 357561)
Yes i plugged that tube when i did the PAIR removal. Is there a way to resynch the throttle tubes? What baffles me is i didnt touch anything when doing the manual cct installation, and thats all thats changed. Nothing else.
Only the throttle plates can be synced by turning the sync screw on the left side of the carbs. |
There's something not right there. As long as your 100% certain it's not the PAIR/Vacuum system, I agree with zxbud and think you need to remove the cam covers again and verify that it's all OK. When moving from the rear cylinder (cam lobes pointing upwards and inwards) to the front cylinder, were the cam lobes on the front pointing upwards and outwards. It's very easy to not turn the crank over enough and stop the first time that the FT mark lines up which is wrong. This is why I say to remove both cam covers and verify that you are definitely at TDC on the compression stroke by verifying by the position of the cam lobes. CCT tension would not cause that but timing not right will.
You may also want to make sure that you have no air leaks either at the carb inlets or in the exhaust system also, as this will cause a bit of popping and banging. (:-}) |
I will pull the covers and post pics tonight, thanks for the advice guys.
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