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GS450 Pod Filters and Jetting

  • Thread starter Thread starter statue
  • Start date Start date
S

statue

Guest
Hello,
I would like to install a couple pod filters on my '82 450.
First question: What is the difference between K&N and cheapo filters? Is K&N worth the extra cash?
Second question: Jetting. I'm not very experienced at this sort of thing (no experience at all). I have taken my carbs off and apart and then bombarded them with carb cleaner spay, but that's about it. I have heard of main jets, pilot jets, needles and different sizes, but I don't really know what all this means and how to do it. Is there a good guide for how to do that and what sizes are best for a GS450 with pods?
 
Just curious, if you have no idea how carburetors work, what exactly is it you are trying to accomplish by going to pods?
 
For one, the air filter is shot and just crumbling inside the air box, so I'd have to replace that anyways. For two, they look really good compared the the air box. I understand that pod filters allow more air, which, if there is enough fuel, can increase performance, but honestly I am not expecting a huge change in performance. I understand what carburetors do and how they work, I just have no experience working on them.
 
statue said:
For one, the air filter is shot and just crumbling inside the air box, so I'd have to replace that anyways. For two, they look really good compared the the air box. I understand that pod filters allow more air, which, if there is enough fuel, can increase performance, but honestly I am not expecting a huge change in performance. I understand what carburetors do and how they work, I just have no experience working on them.
Click to expand...

I think pods look great and they resulted in a seriously in-depth experience for me in how to rebuild carburetors and how they do an do not work. I think I also got a higher alcohol tolerance and made up some new swear words. It was great fun.
 
GSCafe said:
I think pods look great and they resulted in a seriously in-depth experience for me in how to rebuild carburetors and how they do an do not work. I think I also got a higher alcohol tolerance and made up some new swear words. It was great fun.
Click to expand...
This made me laugh! :lol::lol:

statue, jetting carbs is not difficult. If you can remove the carbs and open them up to clean them, you've already done most of the work. The challenging part comes form picking the correct jets. You obviously need more fuel (larger jets) to go with your pods, but how large can be hard to pinpoint. My bike has the older VM carbs so I don't know the CV carbs very well. Found this cleaning/rebuild guide on BikeCliff's site: http://www.mtsac.edu/~cliff/storage/gs/mc_maint/GS_CV_Carb_Cleaning_Series.pdf. This should help you located all the jets.

I just bought my bike and it came with pods. I'm planning to open up the carbs to clean them and see what jets are in there. Never done this before but as you said, we gotta start somewhere!
 
Be sure the pods you get don't occlude the idle air passages. Some of the cheap ones have a step down diameter going into the filter section.
 
statue said:
Hello,
I would like to install a couple pod filters on my '82 450.
First question: What is the difference between K&N and cheapo filters? Is K&N worth the extra cash? Thats up to you. K and N are higher quality for sure. Do I think they are worth it? I don't think so.
Second question: Jetting. I'm not very experienced at this sort of thing (no experience at all). I have taken my carbs off and apart and then bombarded them with carb cleaner spay, but that's about it. Will do nothing. It's the carb metering circuits that need cleaning. Get a can of carb soak. Go to http://members.dslextreme.com/users/cbsaunders/gs/gs450_carb_cleaning_guide.pdf I have heard of main jets, pilot jets, needles and different sizes, but I don't really know what all this means and how to do it. Is there a good guide for how to do that and what sizes are best for a GS450 with pods? There is none. I have seen people say lot's of things and mine ended up no where near what they said. By a jet kit, you will need the high speed main's and the needles. Your stock needles are flat with no taper and will create flat spots as the spring is over coming vacuum. Don't mess around with it, don't be cheap. It is frusterating. As far as performance gains, I have seen absolutely none except minor placibo affect. It just sounds cooler.[/QUOTE]

I am not sure if it helps but honestly there is no way to tell you. Heck elevation changes will change everything. I cann tell you my bike has become a lot more tempermental but it doesn't bother me. If it bothers you then leave as it is.
Click to expand...
 
Dynojet 3113 appears to be the kit for your bike. Install it per the directions and it will work well. You can try going up 2 steps on the idle and at least 2 on the main but I agree with Jeff that it's the needle in the kit that makes the difference. As far as brands, K&N are good but overpriced. I like APE. You can get them from Pingel.
 
statue said:
Hello,
I would like to install a couple pod filters on my '82 450.
First question: What is the difference between K&N and cheapo filters? Is K&N worth the extra cash?
Click to expand...

No. My APE pods were less than half the $ of K&N.

attachment.php


Get the right Dynojet kit, install it correctly, and you will notice performance gains, especially if you open up the exhaust.
 

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Welcome to hell :D

http://www.thegsresources.com/_foru...ting-My-1982-450&highlight=tuning+jetting+450

Take note I'm now on 2001 GS500 carbs because my diaphragms died, but at the end of the stock carb process I wanted to get rid of them anyway as I had no practical way of getting a Dynojet kit suitable for the carbs. The only kits I could find were for the 83 and onwards 450's which have completely different carbs. There is no Mikuni needle that will swap in either.

As for pods, I couldn't find APE pods that would fit, only dodgy cheapo's and K&N's. The dodgy cheapo's have a rubber lip inside that will obstruct air flow into the various carb passages, so stick with K&N (or some other *good* pod that will fit).

The other alternative of course is velocity stacks, but make sure you get some sort of filter for them. I'm running stacks on the GS500 carbs now and I have some mesh over them temporarily until I sort a proper filter. I can tell you however that the intake noise with the stacks on is... addictive... it is hard to keep the throtttle closed...
 
Rob S. said:
No. My APE pods were less than half the $ of K&N.

attachment.php


Get the right Dynojet kit, install it correctly, and you will notice performance gains, especially if you open up the exhaust.
Click to expand...

Apples to apples bother, he has a duece
 
Thanks for all the replies! Very useful information. Pete, thanks for telling me that '83 and on have difference carbs, otherwise I would have gone for the wrong dynojet kit.
 
No probs mate, our 80 - 82 450's are somewhat the red headed step child of the twin range to a certain extent... the carbs are unique to these and the ignition is used on these and just a few other models so issues in these areas are getting to be a pain to sort out.
 
So, I ordered some pod filters (cheapos to start), o-ring kit for the carbs and jets. Also, the tool for checking valve clearance. Now I am just waiting for it all to arrive.
 
Is there a difference between quality filters and Cheapos? Absolutely! There are very real functional issues with the EMGO style filters...aside from their inability to filter. Here is a thread I created on another forum explaining the difference. Bear in mind, however. that my carbs are VM carbs not CV (vacuum slide) carbs. CV's are even more critical of individual filters of any type because they are designed to utilize a large, still volume of air to operate the slides evenly and correctly. So, all the issues that I bring up with the VM carbs....multiply by 2 or 3 with CV's.

http://www.caferacer.net/forum/tips-tricks/19639-pod-filter-thread-geeto.html
 
8ball said:
Is there a difference between quality filters and Cheapos? Absolutely! There are very real functional issues with the EMGO style filters...aside from their inability to filter. Here is a thread I created on another forum explaining the difference. Bear in mind, however. that my carbs are VM carbs not CV (vacuum slide) carbs. CV's are even more critical of individual filters of any type because they are designed to utilize a large, still volume of air to operate the slides evenly and correctly. So, all the issues that I bring up with the VM carbs....multiply by 2 or 3 with CV's.

http://www.caferacer.net/forum/tips-tricks/19639-pod-filter-thread-geeto.html
Click to expand...

8Ball

Just read this thread and that is exactly what I am experiencing. I was actually going to go through so carb springs I have to see if I had a more robust spring to overcome vacuum. I has a horrible dead spot and I could tell the needle is not moving and now I know why.
 
statue said:
For one, the air filter is shot and just crumbling inside the air box, so I'd have to replace that anyways. For two, they look really good compared the the air box. I understand that pod filters allow more air, which, if there is enough fuel, can increase performance, but honestly I am not expecting a huge change in performance. I understand what carburetors do and how they work, I just have no experience working on them.
Click to expand...

You do know that a new air filter is relatively cheap and easy to replace? I'm guessing you're getting rid of the side covers or don't have them since the air box is pretty well hidden behind the side covers.
 
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