popping on deceleration

[doconabike]

I am not sure there is a spring retainer used with the 650g intake. Both of mine use a cone shape foam style air filter that fits onto a plastic "cage". This filter, cage then presses into the D shaped opening and is held in place by the outer airbox cover. This cover is attached to the inner half by two sliding fasteners, which are a royal PITA to get back in position without dropping several times.

Supposedly, the cage comes with the factory air filter if you are missing one. One of my bikes was running without the cage with the filter just stuffed in and it ran fine. I really don't think the 650 were plagued with the lean-ness as other bikes. The 850 and 1000's seem to suffer more if their airboxes weren't sealed well.

Basically I think I need this part right?



I have the filter I dont have the cage.

I guess a long term question is how big a deal is this popping? I'm trying to prep the bike for a 2000 mile trip to Canada that I'll be taking in June....

[Dave8338]

Basically I think I need this part right?



I have the filter I dont have the cage.

I guess a long term question is how big a deal is this popping? I'm trying to prep the bike for a 2000 mile trip to Canada that I'll be taking in June....

Correct you are. The popping should go away with a lean condition fixed and exhaust that seals correctly.

[waterman]

If I were going to take it on a 2000 mile trip, I would completely go over bike and make sure everything was cleaned and double checked. First, I would thoroughly clean carbs, replacing orings as necessary. Adjust pilots screws for best idle, and sync carbs. Next check valve clearance. Check brakes, replace fluids. Check rear spline, with your low mileage it should be fine. Go over charging system, clean electric connections.

Even without taking a long trip, I would do these things in general just to minimize my chance of a breakdown, plus it is just maintenance on an older motorcycle.

Peace of mind is priceless when away from home.

[1_v8_merc]

haha, i always thought the downshift popping was kind of cool, as long as it's not too loud or obnoxious sounding.
(you can hate me all you want for it, but it is what it is!)

The previous owner of my 650g damn-near flatend out the bottom of my exhaust pipes somehow, so im guessing i will be having a similar problem as you did.

----

But if you're going on a 2000 mile road trip, the popping might be the least of your concerns, assuming it's a small issue.

Do as the other poster said, and do a COMPLETE check over the entire bike.
You'd be shocked at what you would find.


I just did a quick random check one day, next thing I know, I'm sitting there for 3 hours repairing wire connections.
I couldn't believe what I found.....

But it amazes me how these bikes still run so well, considering their age, and also considering some of the corroded and crapped-out parts i've found.

[Guest]

Actually, Octain (for once) had a very valid point. No need to get all testy about it. Often, depending on the studs/bolts, and exhaust systems, the bolt will continue to tighten and never bottom out, and then, suddenly, *snap* it breaks... My kid brother did this to my 1000G, "It never felt like it was getting tight" he cried as I retarded my anger to avoid beating him senseless... Its pretty easy to over-tighten an exhaust bolt and then find the other side of it sitting in your socket.. So, in that respect, he was simply warning against it. It's ok there Zi...whatever the heck that is... No one is trying to make you look like a dumbass...

I got your "for once" right here Beotch!!

[Guest]

Apparently humor doesn't translate well over the internet.

Or some people don't have a sense of it.

I thought it was funny..
Just so ya know..

[Iommiguy]

>Popping in the zorst usually happens for two reasons:
>1. A super-free breathing exhaust, eg. straight-through pipes, or a >megaphone' muffler, or some other custom loud sparingly-muffled setup.

Hey guys, this is exactly the kind of muffler I have on my '80 GS850, thanks to the PO. I also get the popping sounds when decelerating. Is this harming the engine at all or something I should be concerned about? Thanks!

[Guest]

>Popping in the zorst usually happens for two reasons:
>1. A super-free breathing exhaust, eg. straight-through pipes, or a >megaphone' muffler, or some other custom loud sparingly-muffled setup.

Hey guys, this is exactly the kind of muffler I have on my '80 GS850, thanks to the PO. I also get the popping sounds when decelerating. Is this harming the engine at all or something I should be concerned about? Thanks!

How do your plugs look?

[KEITH KRAUSE]

The popping could be related to lean or rich conditions or even a semi-fouled plug.
But since you are aware of the air filter not seating/sealing right, then correct that first. If the popping continues then we'll go from there.

[tfb]

There's an article on the U.S. Mikuni website which explains popping in the zorst:

http://www.mikuni.com/tg_backfires_in_exhaust.html

OK, it's for Harleys but the theory applies to any exhaust system.

[Texasgs]

re

There's an article on the U.S. Mikuni website which explains popping in the zorst:

http://www.mikuni.com/tg_backfires_in_exhaust.html

OK, it's for Harleys but the theory applies to any exhaust system.

Great writeup at Mikuni on the subject. I have become so accustomed to the popping and other raspy noised on my 82 GS1100E when I let off the gas, that it is almost like its heart beat. Instead of being a problem, it lets me know all is well. It has a super free flowing exhaust, and is jetted just a little fat, or rich, and it still spits, bangs and growls, when you let off of the gas. It's actually a hardcore melody that only a true motor head can enjoy. I think I am going to record it and set as a ring tone on my phone LOL.

[doctorgonzo]

I gave up on trying to get rid of the deccel pop on my G. I think it's normal. I don't see much way you could go from pouring gas in the chamber from a 160 main to instantly on the pilot without some pop while the speed of the engine catches up.

[doconabike]

haha ok it seems like the popping may not be that big of a deal which is good. So far, we've cleaned the carbs (didn't replace o-rings or anything did it before I found this site but its running pretty well). Replaced tires, going to replace brakes. I'm not sure what you mean by syncing carbs, but I'm sure bikecliff will have something there so I'll check that out. The idle is a little low (<900) I'll increase that but its not given me any problems.

Now valve adjustments. How important is this? The only reason I ask is that the bike is running (IMO) fairly well right now and I'm scared that opening it up may cause more harm then good. With the way school is right now (medical licensing exam coming up in june ) time is at a somewhat premium. On top of all that I'm mechanically inclined but not experienced (and the bike has 6xxx miles!).

[doctorgonzo]

haha ok it seems like the popping may not be that big of a deal which is good. So far, we've cleaned the carbs (didn't replace o-rings or anything did it before I found this site but its running pretty well). Replaced tires, going to replace brakes. I'm not sure what you mean by syncing carbs, but I'm sure bikecliff will have something there so I'll check that out. The idle is a little low (<900) I'll increase that but its not given me any problems.

Now valve adjustments. How important is this? The only reason I ask is that the bike is running (IMO) fairly well right now and I'm scared that opening it up may cause more harm then good. With the way school is right now (medical licensing exam coming up in june ) time is at a somewhat premium. On top of all that I'm mechanically inclined but not experienced (and the bike has 6xxx miles!).

Pretty important, and probably just about due for one. The performance will steadily degrade and then eventually you'll burn the valves.

[KitKat]

if you adjust the valves, a fairly simple task (even i did it ), it cannot hurt the bike one bit. It makes running and shifting smoother + starting a lot easier (if it was hard to start in the first place).

No harm can come if you do it right. There is a video that is extremely helpful, with a step by step process:

http://video.google.com/videoplay?docid=-2015554469142545363&ei=dRs9S7u5LIfMqgKftYFa&q=gs+500+valve+adjustement&hl=en#

its on a gs 500 closer to modern one, but his valve adjustment process is the exact same on our bikes, and he gets perfect camera angles. This video inspired me to do my valves! you can skip the first couple minutes because that is just him removing his seat and side covers and tank...

Good Luck!!