Carb Guys here is your chance.

[Camoman]

I got my air box on. I rebuilt my carb with carb rebuild kit from K&S.
190 main and I cannot remember what the pilot jet is? I think it is a 45 but not sure.
Needle clip is 3rd position. New needle valve assembly.
Cold start, I put the choke on and it starts on 2nd or 3rd kick. Take the choke off.
pretty good idle. Smokes pretty good. I can let it idle for about five to 10 minutes and I pull the plug and it is wet and oily looking. (NGK B8EGV). SO does this mean I have to drop my pilot ? I was thinking of dropping to a 30. ???? What about moving the needle clip to 2nd position so that the needle drops down further to slow the flow.

[Blaster250]

I am no carb expert, but I think at Idle you are running on pilot jet only. So change the needle position, which is associated with the main jet problably wont fix you problem.

Ya might want to get a second opinion, as I am just learning this stuff myself.

[lt250racer]

A couple things here....
First off you need to list what year & the modificatoins you have done.

If its the stock mikuni carb, the stock is very close to what you have in it right now:
200 main, needle 3rd groove.

Blaster was right; the Pilot jet is used from 0-1/4 throttle while the Main jet os used from 1/4 -wide open.

I would not be worried that your plug is wet with gas/oil. You are not kdoing the plug test right though... Get on the quad and take it to 4th or 5th gear at a high RPM, Then kill the engien & cost to a stop. Then pull the plug & read it...

Use a new plug too, its hard to read with an old plug......

[Camoman]

1987 lt250 r bored .10 over. fmf slip on, uni filter. ngk b8egv
190 main and I found out today that it has a 45 pilot in it...
I will swap it out for a 30 and go from there..

[fufanu360]

i think that any two stroke idleing for 5 to 10 minutes will foul a plug... REV IT UP

[trx]

Originally Posted by fufanu360

i think that any two stroke idleing for 5 to 10 minutes will foul a plug... REV IT UP

exactly i had mine idling for about 4 mins with no revving and then BOO BOO BLAP AND IT FOULED

[Camoman]

I used to race motocross and had a 3 different YZ 125's over a course of two years. It never fouled a plug....
I pulled my reeds to make shure there was no cracks or chips and the look good.
So It calls for a 30 pilot jet, So I will get one and start from there...


thanks