Carby NT Carb Tuning Basics

Hi Steve, u say to do a plug chop, bring the motor up to running temp, then fit a new plug. I just want to point out that it is adviseable to NEVER remove a plug from ur motor when hot, there is a very real chance of the thread coming out of the head with the plug. Always remove plugs with the motor cold. To do a plug chop, put a new plug in, bring up to temp then do a good longish run at wotever throttle position & proceed as Steve says. Cheers
 
So, is the picture label for the choke right? Up is "off" no choke and down is "on", choke? Can't read the Chinese on the carb.
 
Found choke problem. The 'C' washer was slightly bent and must have bound the spring and let the slider and needle float off the seat. Took a thick alum. washer, cut it out and she worked great.
Been having another problem getting the idle down. With the idle screw all the way out, it still runs at high revs. Looking at the slider, it seems that the only adjustment the idle screw does is when you go in, CW, it lifts the slider off it seat. Without the screw, it should idle very slowly or not at all.
 
Been having another problem getting the idle down. With the idle screw all the way out, it still runs at high revs. Looking at the slider, it seems that the only adjustment the idle screw does is when you go in, CW, it lifts the slider off it seat. Without the screw, it should idle very slowly or not at all.

First check that the slide is returning right to the bottom. (It might not be if you have the cable casing adjusted too tightly, you need a couple of mm play.)

If it still idles high, it's an indication that you have an air leak and the mixture is lean. Check your plug colour to confirm. Good luck.

*** I'm not returning to MBc, (don't ride any more), but just happened to be passing. No PMs etc, please, everyone.

... AussieSteve
 
Was the needle

The needle was also slightly bent and had a tiny divot. straightened and blended out the needle, idle is down to where she should be.
 
Back
Top