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Making good with what you've got...

  • Thread starter Thread starter DrewDude320i
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DrewDude320i

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Can anything be done to squeeze more performance out of the stock exhaust? the outlet holes are very small, and i imagine that builds up some back pressure but i'm sure they could afford to be a little larger. Also, anyone know where I can get performance air intake? On ebay there's what looks to be something like a K&N filter, but I don't exactly see how it'd fit up...

http://cgi.ebay.com/ebaymotors/1981...ryZ35597QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
 
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What kind of bike do you have?

I have one of those K&N air filters in my bike. It fits in the stock airbox under the seat. It's as easy to install as a AA battery in a TV remote control. To install it, you remove the airbox cover. There's a piece of metal that acts as a spring that holds the filter in place. Press that piece of metal and lift out the existing filter. Then press the new filter into place and replace the airbox cover. Might as well get a brand new K&N filter than a NOS one - check out K&N's website to see which one you need.

I'd refrain from modifying your stock exhaust. You'd probably make your bike run poorly from the increased flow unless you rejetted. If you want better performance, the ideal setup would be a new 4 into 1 aftermarket header/exhaust, individual pod filters, and a stage 3 rejetting job.
 
Would I have to rejet with a K&N and the stock exhaust and airbox?
 
Agree with above post completely. Don't mess with your exhaust, or intakes unless you want to do a carb rejet, raising needles etc. If you enjoy experimenting and taking things apart until you get it right, then fine, but any exhaust modification, intake modification or combination of both will require carb work.
 
K&N says no, although your mileage may vary. The new K&N is a lot more free flowing than the stock filter especially if the stocker is dirty. The GS guru I take my bike to for major work says some of his customers have to rejet after installing a better aftermarket filter.

My bike's exhaust smelled rich prior to installing the K&N filter. The increased airflow leaned out the mixture a little, closer to where it should be, so it runs better now.

Billyboy said:
Would I have to rejet with a K&N and the stock exhaust and airbox?
Click to expand...
 
The K&N shown on ebay is a replacement filter that goes in the stock airbox....though they flow a bit more than stock, they require no re-jetting according to K&N. Thats a good buy if you can snag it at that price....they usually go for around $40.00. Keep in mind you will have to oil it with K&N air-filter oil before using it.

Tony.
 
I've been using K&N products for the last 20 years and have never had to oil a brand new filter before using it. They come pre-oiled, just drop in and go. You will eventually have to clean the thing and at that point it will need to be re-oiled.
 
You are correct...the new filter I bought was pink from being coated with the KN filter oil....the one he is looking at is white (or close to it), probably from being NOS ....I don't know. I would oil it before using if it looked like that.

Tony.
 
I put a K&N replacement filter in my stock airbox- rejetting was not necessary.
Performance gains were minimal- until I put holes in the side covers of my airbox.
I had to rejet when I made the air box flow better (with the holes), increased the performance nicely. This was on an 850 engine.
Now I have a 1000 engine with K&N pods (dynojet kit) and a Vance & Hines pipe and she really runs well.
 
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