weird popping
09-15-2013, 03:24 PM
#1
Junior Member
Squid
Thread Starter
Join Date: Sep 2013
Posts: 8
weird popping
Okay so i have 98 superhawk. dual Jardine slip on exhaust. K&N high flow filter. Block off plates. Ignition timing advance +4 degrees
Okay so ive always messed around with the jetting trying to get it right. always seams to chasing my tail no matter what. Its pretty close now where it is. stock pilots and i cant remember what size mains. But recently i just put in the timing advance and then maybe 3 weeks later it started to pop when you decelerate. I guess my question is what is going on? it has never ever done it before even when jetted badly. I rode it to school fine then when i started it up in the afternoon it just started popping. Its a loud popping coming from the exhaust. Also what are you guys running for jetting with the same setup i have? I know my pilots need bumped up but she runs good and never really sputters only when shes cold and its a hesitation in throttle. I just do no think the poppping is jetting related.
Okay so ive always messed around with the jetting trying to get it right. always seams to chasing my tail no matter what. Its pretty close now where it is. stock pilots and i cant remember what size mains. But recently i just put in the timing advance and then maybe 3 weeks later it started to pop when you decelerate. I guess my question is what is going on? it has never ever done it before even when jetted badly. I rode it to school fine then when i started it up in the afternoon it just started popping. Its a loud popping coming from the exhaust. Also what are you guys running for jetting with the same setup i have? I know my pilots need bumped up but she runs good and never really sputters only when shes cold and its a hesitation in throttle. I just do no think the poppping is jetting related.
09-15-2013, 04:07 PM
#2
Senior Member
MotoGP
Join Date: Jul 2010
Location: Phoenix, AZ
Posts: 3,869
Here are a few things to get you started. It would be good to look at 8541Hawk's carb setup thread for jetting suggestions. One thing you will find is that many people have a hard time with K&N on this bike and get much better results with a stock paper filter.
Second, I remember reading somewhere that the earlier VTR's don't benefit from an ignition advancer. Don't remember what years or why, but it could have something to do with less stringent emissions standards and those earlier years having different ignition from the factory. May be something worth looking into. I know that it's not a hugely popular mod, and some folks take theirs out after installing it.
Second, I remember reading somewhere that the earlier VTR's don't benefit from an ignition advancer. Don't remember what years or why, but it could have something to do with less stringent emissions standards and those earlier years having different ignition from the factory. May be something worth looking into. I know that it's not a hugely popular mod, and some folks take theirs out after installing it.
09-15-2013, 04:20 PM
#3
Senior Member
Superstock
Join Date: May 2012
Location: UK
Posts: 397
Second, I remember reading somewhere that the earlier VTR's don't benefit from an ignition advancer.
First thing I would check is for any exhaust leaks as this will cause some popping on the overrun.
(:-})
09-17-2013, 02:49 PM
#4
European Member
Back Marker
Join Date: Mar 2013
Location: Netherlands
Posts: 194
i have no idea how it works or looks regarding the ignition advancer but ive seen something of a half gear looking thing online
maybe its come loose or stuck you said it happened 3 weeks after the advancer, our bikes vibrate alot as i dont need to tell you
just do some trouble shooting with it take it out inspect it
do a run without
maybe its come loose or stuck you said it happened 3 weeks after the advancer, our bikes vibrate alot as i dont need to tell you
just do some trouble shooting with it take it out inspect it
do a run without
09-19-2013, 01:56 PM
#5
Junior Member
Squid
Thread Starter
Join Date: Sep 2013
Posts: 8
I personally noticed a big deference in the timing advance. But that is keyed on there only one way so its not like it can move. and if it came loose i would have a much bigger problem that would be noticeable
09-19-2013, 03:25 PM
#6
Senior Member
Superstock
Join Date: May 2012
Location: UK
Posts: 397
But that is keyed on there only one way so its not like it can move. and if it came loose i would have a much bigger problem that would be noticeable
You have to understand what the advancer does. The +4 ignition advancer is a mechanical device and attached to the primary drive gear and as much as I understand gives (I think magnetic signal) to the ignition pulse generator that sits above it. So the positioning of the cogs on the ignition advancer are the key here as they pass over the pick up on the pulse generator. It then sends a signal to the coils which tells them to fire a spark. So by changing the ignition pulse generator rotor, as it's called in the manual, to a more advanced one (+4 advancer) you altering when the signal is sent therefore changing when the coils fire a signal to the plugs. The pulse generator and rotor are a bit like the old points we used to get in distributors.
The improved fuel efficiency, is more of a side effect of advancing the timing as you get a cleaner burn in the combustion chamber from igniting the fuel even sooner (more degrees BTDC) as the piston is coming up on the compression stroke. The more efficient burn is also where you get the increase of power from.
As for the popping on the overrun/deceleration the first thing you should check is for any exhaust leaks around the seals. Also removing the PAIR system will cut down any popping.
(:-})
09-22-2013, 09:14 AM
#7
Junior Member
Squid
Thread Starter
Join Date: Sep 2013
Posts: 8
The PAIR system is already blocked off. And there are no exhaust leaks. I didn't think this popping was from the advance because Ive never head of it doing that. And i actually didn't notice an increase in fuel mileage after the advance was put in. I still got 150 miles to the tanks and then my fuel light came on
09-22-2013, 11:17 AM
#8
Senior Member
Superstock
Join Date: May 2012
Location: UK
Posts: 397
I take it that they are standard Jardine's and have not been chopped down into stubbies or anything silly like that. So no exhaust leaks or vaccum problems then the only thing left then has got to be either timing or tuning problems. I'm a bit stuck now with the info that I have to work with.
(:-})
(:-})
09-22-2013, 01:48 PM
#9
Senior Member
SuperBike
Join Date: Mar 2012
Location: New South Wales Australia
Posts: 1,544
I have a 4 degree ignition advancer on my 2005 with pair blocked and have not experienced any problems such as you describe, However If it was me I would be checking all breather hoses on the air filter and cylinder heads.
You may find one not fitted properly, or one disconnected!!!!!!!
You may find one not fitted properly, or one disconnected!!!!!!!
09-29-2013, 07:44 PM
#13
Junior Member
Squid
Join Date: Sep 2013
Posts: 12
Sometimes the exhaust gasket between the rear cylinder pipe and the rest of the manifold will go out and need to be replaced. My Hawk had that problem emerge in the middle of a road trip. Lots of cool, but probably bad, popping/misfires.
Thread
Thread Starter
Forum
Replies
Last Post
EngineNoO9
General Discussion
11
11-22-2005 08:37 PM
