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Backfiring, with LOTS of detail... Help please.

  • Thread starter Thread starter Skyboy8950
  • Start date Start date
Timing.

Correct me if I am wrong, but the only timing that can be done for this bike is with the chain? Can I advance/retard the timing? Could this even be my problem?

Could the PO have changed the jets on me? Hmmm...
 
Posted by Skyboy8950:
Since we are talking about the filter, how does it sit in the box. It is just a foam filter. There is no housing like shown in my manual. Which way is it supposed to sit?


This sounds like it could be a big part of the problem. Are you saying there is no wire cage that the foam filter fits over? This needs to be in there and slid and clipped into place, or else the filter wont seal up against the air intake. You're likely sucking in too much (unfiltered) air. These bikes are notorious for not running right without the airbox and filter sealed up properly.

I would locate a filter housing before I spent any more time troubleshooting.
 
Interesting...

I noticed that there were two clips (facing inward) on one end of the box and one clip (facing outward) at the very end pointing out the side. Does anyone have a picture of what it should look like when installed? I saw one on here a while ago without a cage but I cannot find it now. Where would you suggest I get a housing?
 
Last edited:
Skyboy8950 said:
Interesting...

I noticed that there were two clips (facing inward) on one end of the box and one clip (facing outward) at the very end pointing out the side. Does anyone have a picture of what it should look like when installed? I saw one on here a while ago without a cage but I cannot find it now. Where would you suggest I get a housing?
Click to expand...

Here's a link to my airbox fix-up pics. I think there's some difference between my '81 and your '82, but I'm not sure how much. There's a number of guys on here with '82's that probably know - Basscliff springs to mind). Anyway, there's a filter cage in a couple of the pics.

Someone might have said it already, but these bikes (and the 850's in particular, I've read) are fussy about intake pressure, so getting your airbox sorted is a worthy way to spend some time on this backfiring issue. Then readjust the mixture and re-test.
 
Bunny,

Those were the pictures I was thinking about. Yea, I'm just missing the cage I guess. Does that wire mesh come with it? I just have a long hole from the lower chamber to the upper chamber.

Now I just need to find one... Are they common? Special order? Do they exist?
 
So what I found out was this:

I have to buy the stock air filter for ~$50 to get a new filter and a cage.

- OR -

I can buy pods, a 4-1, and a jet kit for ~$500, which I want to do anyway (maybe).

Please check out my post HERE and let me know what I should do!?!?
 
Skyboy8950 said:
So what I found out was this:

I have to buy the stock air filter for ~$50 to get a new filter and a cage.

- OR -

I can buy pods, a 4-1, and a jet kit for ~$500, which I want to do anyway (maybe).

Please check out my post HERE and let me know what I should do!?!?
Click to expand...
Skyboy, I have to interject here to say that you really need to consider what exactly you want out of this bike before you proceed with pods and a pipe. 850s are notorious for being "buzzy" bikes if the carbs and valves are not PERFECT. Unfortunately, its damn near impossible, even with a jet kit, to get pods PERFECT in all throttle stages. It will require ALOT (and I mean ALOT) of patience and tuning to get them this way, and CONSTANT tuning to keep them that way. Pods make the bikes more succeptable to temperature and atmospheric changes. If you want a 4into1, it can be done without pods with great success. Pods throw an entirely different set of circumstances and variables into tuning a bike. My suggestion, buy a new air filter (even a drop in K&N for it!) and get your fourinto-one with a DynoJet Stage I kit designed for your bike. I think you will be most pleased.
 
CafeKid,

I see what you are saying. I like what you are saying, but for my bike, there is only a stage 3 kit. Craiger said that he has a K&N drop in and a 4-1 pipe and that it runs very well. Very tempting. Yes, the tuning part could be bothersome, not to mention I don't really know what I am doing when it comes to "tuning".

Well, just more to consider.
 
Skyboy8950 said:
CafeKid,

I see what you are saying. I like what you are saying, but for my bike, there is only a stage 3 kit. Craiger said that he has a K&N drop in and a 4-1 pipe and that it runs very well. Very tempting. Yes, the tuning part could be bothersome, not to mention I don't really know what I am doing when it comes to "tuning".

Well, just more to consider.
Click to expand...
Nothing to consider...the Stage I kit is included in the Stage III kit :) I suggest trying it this way, perhaps with the KN drop-in, then if you arent satisfied, you can attempt pods as well. I think that you will be quite pleased with the results of just the pipe and drop in plus the kit. BTW, I have a NICE VH four-into-one im selling for a little less than 2/3s new. Its a pretty good looking pipe, nearly new. PM if interested.
 
Skyboy8950 said:
Timing.

Correct me if I am wrong, but the only timing that can be done for this bike is with the chain? Can I advance/retard the timing? Could this even be my problem?

Could the PO have changed the jets on me? Hmmm...
Click to expand...

I don't know anything specific to your bike, but I see on the fiche that it has electronic ignition instead of points, but all the same, doesn't spark timing get adjusted the same way via rotating the breaker plate (or I guess signal stator in this case) relative to the spark timing marks? Can someone with a newer GS (it's all relative) bike chime in here?

Anything possible with a PO, still the jets should be marked. Next time you have the bowls off, check the stamp on the main jets. At what throttle position are the symptoms occurring? This may not even be on the main circuit, meaning that the main jet will not be a suspect.

You mentioned that changing the cap seemed to help for a bit. When you have it apart to trim the wire back, measure the resistance in the cap and let us know what you find. The answer may be as simple as a new $4 NGK cap.
 
Shaughn,

Thank you very much. I will check those. I have figured out that my air filter is not correct, so that is adding to my problem, but I will definitely check the wires and caps as well.

Again, thanks.
 
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