Carburetor - Timing? problem.... Need help diagnosing

[ribbitism]

The K&N will pass more air (leaner) than the paper element and I have read many (BMW car & bike) sources say that it also passes more crap into the engine.

K&N are rated at stopping 95% of dust particles, the stock paper air filter stops 98-99%. The difference is the paper ones don't last as long, K&N are pretty much a lifetime filter needing only cleaning and slight re-oiling and that's not very often at all. A tiny increase in the smallest crap in the air in dusty situations going into the engine coupled with a vast improvement in air flow compared to cost of air filter replacement and restricted air flow.. This is what K&N put across as their selling point, generally explaining that the increase really isn't going to affect anything apart from minor wear in 70k+ miles.

I haven't a clue about the technical setup for a bike with a K&N fitted, I just know the above from a phone call to K&N when I was looking into getting one to cut down my own servicing costs etc :)

[Mongo]

I think the exhaust will help a little bit, but with a factory-jetted bike you're already running pretty lean.  You'll have to re-jet to put more fuel into the cylinders to keep up with the increase in air from the K&N.  Otherwise, you'll get stumbling, and can cause long-term damage by overheating your cylinders.  I'm pretty sure the other members will back me up on this        ....I hope!

I have put some good miles on my bike since the installation of the K&N and have experienced no problems! Given the looks of the exhaust and the plugs I would say the bike is running really good. I've seen no bluing in the pipes, which would indicate a lean condition (you have to love stainless exhaust).

I would find it hard to believe that a reputable company such as K&N would market a replacement element that would cause damage to a stock motor!

[Cuyose]

I got my 97 Bandit with an aftermarket Vance and Hines Exhaust. I am sure it was not rejetted at all for this.  I noticed that it does surge a little and idle a bit rough when cold.  I also used compressed air to clean out the stock air filter a bit.

I am thinking this combined with the exhaust is making it run a bit lean.  On the stock 97 1200 settup, can you adjust enough the idle mixture to relieve this, or is a rejetting of all carbs in order?

[Red01]

A jet kit is the best solution, but you can improve things quite a bit by shimming the needles and tweaking the pilot screws.

CLICK HERE and scroll about halfway down to the "Tuning Tips" section.

[Cuyose]

Odd, I don't get much RPM changes as I tweak the pilot screws(right angle dremel attachment made removing the plugs very easy:)

I am going to continue to futz with it a bit, but things are improving a bit after enriching them a turn.

[Daytona]

Odd, I don't get much RPM changes as I tweak the pilot screws(right angle dremel attachment made removing the plugs very easy:)

I am going to continue to futz with it a bit, but things are improving a bit after enriching them a turn.

  Do the carb sinc,Po' Man's on this site. Just an exhaust won't make the 1G run anyway but better! Carb sinc, then adj primary's 2 1/2 on all 4 should be the most you will have to do. Even with a K&N! Remove the snorkle? or any holes in box, even small ones! or don't get the airbox cover on rite (the tabs) Rejet time!!!   P/S when adjusting you primary's, make sure the idle is about 12 to 1500 rpm's! Carb sinc, carb sinc, if it hasn't been done Do it!!!!