Lean or rich?

So I'm looking at a few things I need to do to my bike but I'm unsure if it will change it to become more lean or rich. The mufflers need to be repackaged, the air filter is looking very old and I'm thinking about putting in a K&N filter (not pods). I'm guessing more packing in the mufflers and higher airflow filters will both make the bike leaner? I also installed a fuel filter.

I don't use K+N, but I doubt their filter changes the airflow rate much compared to stock. I just use a generic foam air filter with oil on it. "More packing" in the mufflers would increase back pressure and reduce flow rate so I would think that would go richer overall?

I see. I had a foam filter too but they had to be ordered and I was too lazy to go twice to the shop. So it seems it will most likely be richer? That's great at it is a bit too lean as it is.

A perfectly serviced K&N air filter provides acceptable filtration and airflow, but a new stock air filter provides the best filtration along with ample air flow.

Several objective tests have shown that a stock paper filter removes smaller particulate than does a perfectly serviced K&N air filter.

The K&N's advantage is that it lasts forever, and is easy to service (i.e., clean and re-oil) at minimal expense.

Good Fortune!

Did you see the K and N filter in the for sale section ? Not sure but I think its what you need. I've always been a sucker for the K & N brand. :laugh:

The filter was just lying there in the shop looking cheap -someone who ordered it but didn't pick it up I guess- so I went with it. I'm not really a fan of K&N. Seems to me there're just selling (filtered) air :laugh:

hello....

i have much the similar problems with my bike..
the problem is to rich mixture, i think. (the spark plugs is carbon fouled). It starts fine, but after a while it runs very poorly, and it backfires, sounds very bad.
I changed the air filter box with a home made in stainless steel, a bit smaller, but much better looking....
I have had the carburetors in pieces, and replaced the main jets (125). I havent touched the air mixer screws. My exhaust pipes are changed to the originals, from a 4 in one system.

I really dont have a clue...do you have some tips for me? maybe with pictures?

i am sending a picture to illustrate how ive done it..

hope you ore anybody can help me..

best regards Helge

Hi

I think your best bet is searching the forum for Pods as your new airbox would likely change airflow much like installing these. I know many have done it and as far as I can tell almost as many have had problems getting the bike running smooth with them.

If those carburetors are the same as mine, the "air mixture screw" is a pilot screw, only changing the mixture at something like the first 1/3 twist of the handle. If it happens outside that area it is likely the airbox if I had to guess, but I'm new to all of these things.

I would recommend you start a new topic to get all the super knowledgeable people who have been through much the same to see your post.

By the way, that airbox looks great. Have you posted pictures of your bike on here?

HelgeP wrote: ... spark plugs is carbon fouled...It starts fine, but after a while it runs very poorly, and it backfires, sounds very bad....

Classic symptoms of insufficient valve clearances.

Good Fortune!