Weird situation, Ladies n Gentlemen!

Brand new evo. Stock CV carb. I cleaned it (or so I think). Main is 185, pilot is 45.
Extremely difficult to start. Even when hot, needs choke! Idle screw has to be almost all the way in. To get it running at least somehow, the pilot screw has to be somewhere around 4 1/2 turns, almost 5. And the pilot screw gets very very subtle response (don't feel distinct rpm raise/drop).

Suspect air leak? But both plugs look identical - super lean of course - so it's unlikely I screwed up both sides of the manifold. Most importantly, as soon as you pass 1/8 of throttle - everything feels alright. Accelerates great, no hesitation, no sputtering, backfiring, nothing. Only at idle - almost idle - it feels weird.

Thus I think the pilot jet is too small. Some ppl run 48, that's fair enough, but it's a stock engine (with a stock air box and not-so-completely freeflows). So I wonder how the hell factory 42, and sometimes even 40 is supposed to work at all?

Any thoughts, Gentlemen?

 

Your choke isnt a choke,its an enrichener.
Pull the pilot jet (slow idle jet) out and make sure you can see through it.

 

Yes enrichener - exactly, so if it needs it to start when hot - I guess idle system doesn't deliver at all.
I'll look at the jet again, but it was brand new when I installed it

 

Yep,,means you arent getting fuel through the idle circuit.
You could have had something in the bowl that found its way to the pilot.
Its such a small hole that it takes very little to cause a big problem.
Wouldnt be the first time ive had to take a carb apart even after cleaning it.

 

I had same issue with a 45 and I was SURE that all was cleaned, but low and behold after tearing it apart again and looking closely, a little fleck of black stuff was caught and that made the difference. But you say that it's a new cv... damn. maybe some gungk got in there anyway??? just from having run it?

 

So basically you are saying something must be plugged/dirty, since there is no way it would be that bad with 45 on a stock motor?

 

45 is the way to go unless you've changed pipes and air...imo

 

+1 on this. When you cleaned the carb you migrated some dirt into the idle circuit. You need to soak the carb again and and blow everything out with high pressure air like from an air compressor (not canned air). I use my scuba tanks.

 

LOL. For the last 30 years I've always thought that I had some REAL problem with any given engine and it is 99% time the carb...lol

 

No, just the jets are new. So I gotta wash it again