I've got all kinds of info on how to read your plugs but very little info on how to prepare for plug readings....

How long should I "break-in" a new plug prior to taking any readings?

Should I just putt-putt around the yard and a lazy ride down the hill and back and then go through the process of plug checks?

Should I ride around for 15-20 minutes "playing" and then do the plug reading process?

I guess what I'm needing to know is how long does it take for the plug to give a true reading?

Also, I've got a K&N and Supertrapp IDS2 with 10 disks in it and just put in a 160 main (up from a 155)....I haven't really been able to do a real good plug process but from what little I can do I'm afraid I might still be lean...but I did find a great place to do business here locally, VERY helpful shop that has as a main business of building drag bikes....they know horsepower! [img]i/expressions/face-icon-small-wink.gif[/img]

 

im not sure about the new plug but i was told i should run 1/4 mile at 1/4 throttle then again at 1/2&3/4 then wot..when you go for the 1/4 mile ride keep the throttle as steady as possible,and hit the kill switch,cost to a stop and then check the plug..hope this helps

 

And when do you adjust the air/fuel screw?

 

0-1/4 throttle is adjusted with the pilot screw,1/2-3/4 is adjusted with the needle clip and wot is adjusted with the jets

 

Hey Rook when did ya change jets? Was that shop you talkin about that one with the cannondales?

 

I would think that the 160 should be good. That is what comes with the HPD exhaust. Try turning your air/fuel screw 3 turns out from lightly seated and see what that does for you

 

I changed it today....and yup, I got it from Horsepower Unlimited.....had a good talk with the owner. [img]i/expressions/face-icon-small-smile.gif[/img]

BigBad...just to reinforce my un-mechanicalness....the air/fuel screw is the philips-head screw attached to a short tube-like thing going to the right side of the carb (if looking at it from a riding position)? I can't find any real reference to it in the maintenance manual...

My quad does bog a little on the bottom if I go from idle to wide open....

 

I believe you are right about its location. It may have a brass plug that you have to drill out. It is #32 on this diagram. My manual refers to it as the "pilot screw". That may help you some

 

BBS, if you don't mind go here and look at the pic...

 

That is the idle adjuster for the carb. I am very familiar with that cuz mine broke (the cable rusted and snapped) when I took my carb off to jet it for the exhaust. It took a lot of messing around with it to get it to idle right after that. Be carful with it. I didn't realize that that little cable is a $40 part!!!