Jet change with lid removed

[Olds Eddie]

I am runnubg 260 mains with 25 pilots and plugs look right. The air box is stock with snorkle removed and K&N filter. What size jets do you think I should try with lid removed?

[dajogejr]

Couple questions.

 

What are ALL the mods done to your bike?

What temps and elevation do you ride at?

Did you properly "chop a plug" or....just looking at coloring after riding the bike for a while?

Do you have a pro-flow adapter (the factory lid aids in sealing the air filter to the front of the air box, without an adapter to seal, you will suck dirt and water into the carbs)

 

This is how to properly dial in your main...color on the end of the plug really means nothing.

http://www.dfn.com/benkaren/plugchop.html

[Olds Eddie]

Couple questions.

 

What are ALL the mods done to your bike?

What temps and elevation do you ride at?

Did you properly "chop a plug" or....just looking at coloring after riding the bike for a while?

Do you have a pro-flow adapter (the factory lid aids in sealing the air filter to the front of the air box, without an adapter to seal, you will suck dirt and water into the carbs)

 

This is how to properly dial in your main...color on the end of the plug really means nothing.

http://www.dfn.com/benkaren/plugchop.html

It is a stock engine with Gnarlys. I have heard about the trick of bolting the filter adapter to the airbox. I plan to do a plug chop as soon as I break in the new top end. It has always run great till the waterpump impeller went away and siezed a piston. I just wondered what would be required to pitch the airbox lid as I have heard it makes a difference. I am riding mostly at 3000 ft. and above 50 deg.

[dajogejr]

It is a stock engine with Gnarlys. I have heard about the trick of bolting the filter adapter to the airbox. I plan to do a plug chop as soon as I break in the new top end. It has always run great till the waterpump impeller went away and siezed a piston. I just wondered what would be required to pitch the airbox lid as I have heard it makes a difference. I am riding mostly at 3000 ft. and above 50 deg.

 

At that elevation with NO airbox lid, 260 or 270 should be about perfect!!

[Olds Eddie]

At that elevation with NO airbox lid, 260 or 270 should be about perfect!!

Thanks. Thats what I wanted to know. I didn't want to burn a hole in a piston. After reading all the hype about needing a special needle to run without the lid I was a bit concerned but I had read where it wasn't necessary either.