Wmv 18 carbs

[Merc 2.5]

So last nite I got carbs on and got it fired up for a sec run into fuel line issue and ran tried idle like crap. Cam home today pulled em all off ,went thru with fine tooth comb , looked thru manual for idle screw setting , got he fired back and I gotta say I'm pretty impressed with off idle response and idle quality, sounds little different to. More crisp. Cant wait see what happens on water and if gain or loose rpm. Gonna play with mains little more I'm sure but so far so good really like the idle sound

[Merc 2.5]

Also without the thermal valve should I just plug end of the hose or leave it open

[Motv18]

I think it gets closed without the valve, but I can’t remember

i do remember it reduces air so the mix is rich till warm, but not sure what way is best without the valve

[eli]

I tried the thermal valve on my 245,s did squat ,so i just ran 2 feet 3/16 hose let it lay along side block

[Merc 2.5]

Don’t know if this will help but here is a shot from the manual on my 2002 200 hp Mercury for the V 18s.

Attachment 452479

Could u post the idle adjustment setting? My manual only goes to wmv 5

[tlwjkw]

should be same startin' point.. 1 1/4 turns I think?

agree with eli, I never used tha t-valve on any of my 2.5 stuff.

. hose between carbs with a plug on bottom..

don't mater after ya get it warm...

[Merc 2.5]

What bout idle mixture screw. Does it let air or fuel in? As I (open) it is it letting more fuel or air. They run gud up top but my wh46 has way better hole shot. Wondering if idle is rich.

[tlwjkw]

"As I (open) it is it letting more fuel" in.


... think this is it but not 100% sure.. was thinkin' air (idle jet size) stays same throuh-out rotation... been awhile...

[Merc 2.5]

Ok thanks. I been playin. (Trial &error) seems like air. I think I got em tuned pretty gud as idle and hole shot great now , gotta check mains and go from there. I think they gonna work good. I also had that valve tube open and it was messin wit me till I plugged it

[Merc 2.5]

Update. Wmv 18 SUCK impo. Haha. Lost hole shot and few rpm up top. Then go out to run it again today b4 I swapped back to 46s to compare and they didnt wanna run for ****! Think I'll throw em over the bridge on my way by!

Ok so I guess I forgot tighten idle screw jam nut and idle timin went hay wire. Better. But still ain't no 46s. Only thing better I notice is gas milage

[Merc 2.5]

Ok so I mite been little pissed off when I made that post lol
They do run fine for what they r I guess. Just not a gud match for my modded motor. It starts a whole lot easier and gud milage but I lost power where It counts with em. Maybe a stock motor would do better idk. But I got set clean set 18s if sumone needs em just not for me. Even the wife said. Well u got better milage but u cant have gas mileage and more power. They just dont go in same sentence together lol

[Merc 2.5]

Got em swapped back out to 46s and was gonna test to "feel" the difference and now just started rainin. Figures

[Merc 2.5]

I found sum .50 jets and swapped the 46 idles to the 50s in the wh46 carbs , hoping It will clean up idle little with even better hole shot

[eli]

Carb is a carb one to another pretty much the same tuning will be the deal breaker ,without egt,s will never get it perfect ,close but not perfect then tomorrow the weather is different from today and we start all over again

[Fishwhisper]

Sorry for the late post but the manual for my 2002 Mercury 200 say idle screw out 1 1/4 turns out +-1/8, though I definitely turn mine out a little extra. Mercury 2.5 I sent you a pm.