Plug chop?

[grpark20]

I'm still new to this. What does this plug chop look like to you guys? I'm running 340 mains, stock needle and stock position with 27.5 pilots. My mods are T-5's and K&N filter with no airbox. I'm at sea level, low humidity, average temp is 50. Also is there a way to check to see if you are rich or lean on the pilots? I ask because I have a cut out right off idle. But my carbs might not be in sync. The slide appears to be moving at the same time, but thats by eye sight. Thanks!

 

 

[2003LimitedBanshee]

Looks to be a tad lean; but you are pretty close. I would go up one size on the main, paying attention to how it pulls and check the plugs then. Also, just an FYI, you can read a great deal off of the electrode, in addition you can usually get a bright flashlight to peer down inside without chopping a set of plugs. I have a workbench light that has a built in magnifying glass that I use.

 

As far as the pilot is concerned, you can probably jet the 27.5 pretty good with around 2 turns out on the airscrew. However, I found that when I stepped back to the stock 25, with .5 turn out on the airscrew, I had been missing out on some throttle response. If you have a UNI-syn, this is the best tool, however you can do just as good if you take your time, by sticking your fingers in the back of the carbs and feeling which slide moves first. I set mine up this way, and then checked it with a UNI-syn after asking my dad if he still had one kicking around from his VW days; it was very near perfect, just takes longer by hand.

[grpark20]

Thanks for the info. I'll try the 350 mains. Although to me tha sounds too rich for my set up and other info. I'll try to get my carbs in sync or atleast make sure they are good.

[sheefreak]

Get a new set of plugs, let it idol for 10 minutes(after warming on another set) and chop those. That will help you tell how you are doing on your pilot.