Blackmax 200 someone read these plugs please.

[rjcamel2355]

Took this thing to the lake last night. Last weekend I accidentally left a plug loose and had some issues idling. Tightened the plug back down and tried it out. Still having some idling issues but that is cable related I'm nearly positive.

When I give it throttle sometimes it does not want to take off too quickly sometimes it just shoots out of the water. Usually if I press the choke for a half second it gets up and goes. (I know that isn't right and would like to correct it)

Rebuilt the fuel pump last week but it didn't seem to help. Still has the same issue and sometimes seems to run out of fuel on the top end if I throttle back a little it picks back up.

Compression is 100-105 on my crappy China gauge. Its 125 give or take 1 or 2psi on a AutoZone rental gauge.

Carbs were thoroughly cleaned when I got the engine 2-3 weeks ago.

In checking the spark plugs I noticed a bolt came out not a head bolt but the water jacket plate? That is bolted in the center of the head. They were all loose a little and I snugged them each back up

Plugs were not wet with gas or water when I pulled them this morning but they dont look right to me. Maybe its just me any input would be awesome.

 

[rjcamel2355]

http://imgur.com/ySfKG8W
http://imgur.com/ke3bk1o
http://imgur.com/Ela5NUI
http://imgur.com/bE0SsOf

I did whipe the plugs off when I pulled them. But they look too clean to me.

 

[Chris1956]

I think they look OK, especially if you wiped them off. I do not see any signs of water infiltration. Your carb idle mixture is likely a bit lean, which is causing your acceleration issue. Richen them up 1/8 turn and see if that helps.

 

[rjcamel2355]

I dont see a way to adjust these particular carbs. But I could be entirely over looking it. If you would point me in the right direction that would be great. The motor pushes my boat 17ft skeeter 68-74mph. The prop is entirely too small 23p quicksilver. But I have plans to upgrade that.

 

[Texasmark]

Look ok to me too. I don't see any water activity on them. No biggie on your water jacket leaking from a performance standpoint. Agree with Chris on the tweak. May take more or less than ⅛ turn....let the engine tell you what works. Serv. Manual defines the correct setting to be where the engine idles properly (probably actually set by timing advance/retard using the throttle linkage idle knurled, spring loaded set screw) as a strong acceleration during the hole shot....aka engine taking and going with all the throttle you give it coming up onto plane. Even though you have firewalled the throttle, the engine combustion generating vacuum hasn't moved out of the idle range so the idle set screws on the carbs are in control due to being in the lower part of the rpm spectrum.

A pic of the carbs would help. Usually the carb tweak is a copper, knurled end, spring loaded screw sticking into the right or left side of each carb right in the middle of the casting, usually the left side(port side when carb is in the engine on the boat).

 

[Chris1956]

Some of the older V6 Mercs had fixed idle jets. Most of them had adjustable (6 adjustments) idle mixture. You need to see what you have.

 

[Faztbullet]

Is this the 2.4L 200hp you posted had the weak #2 cylinder????

Some of the older V6 Mercs had fixed idle jets. Most of them had adjustable (6 adjustments) idle mixture.

None of the older V-6's(150/175/200/225) had adjustable carbs as they had WH fixed jet series, the V-6 did not get adjustable carb(WMH) till about 1991 when the 2.5L block came out.

 

[Dukedog]

I noticed a bolt came out not a head bolt but the water jacket plate? That is bolted in the center of the head. They were all loose a little and I snugged them each back up.

his pretty much tells ya its old enough ta have tha jets only wh's on it....

 

[sam am I]

Plugs look fine to me...Mine all ran wet'ish w lil oil like that brand new from the factory nursery back in 92 and again after my complete rebuild 22 yrs later. As pointed out above, if you can tweak the carb's (you have those types), and that's the issue, it usually just takes as small as a 1/8 (even a 1/16) sometimes to make her purr........

 

[rjcamel2355]

Is this the 2.4L 200hp you posted had the weak #2 cylinder????

None of the older V-6's(150/175/200/225) had adjustable carbs as they had WH fixed jet series, the V-6 did not get adjustable carb(WMH) till about 1991 when the 2.5L block came out.

Yessir fazt bit is the eame engine I had posted about with cylinder 2 issues. After a seafoam treatment and some marvel mystery oil it has all straightened out and has even compression. I tested it 2-3 times each cold and warmed up to make sure I wasn't going crazy. I checked all the jets just to reassure myself today that wasn't an issue. All are clear and clean. (A friend brought me a 150 with #1 completely clogged over the weekend and I wanted to rule that out).

I'm thinking the fuel pump may be an issue because the bulb doesn't stay rock hard when running (its a Wal-Mart bulb with an inline automotive fuel filter) but I went completely through it with a kit last weekend.

With me it runs great wide open. If I throw a little more weight in it 2-3 people it seems to run out of fuel and surge top end if that makes any sense. More weight more load I assume.

Floats are all evenly adjusted and correct. Main jets are 80s except 1 and 6 are 82s they're all clean.

Could the inline fuel filter be causing issues?

Will post carb pictures in just a moment.

 

[rjcamel2355]

Carbs say 13745427 on top of them. The plate is too dirty to read. Ill try to clean it up and get the wh number.

Its dirty but here is what I have. Is the screw on the side the adjustment screw?

http://imgur.com/FfhycAL
http://imgur.com/z06oLpt
http://imgur.com/4R8oAhO

 

[Silvertip]

The bulb does not stay hard once the engine is running. It's physics -- or hydro dynamics!!!!

 

[Dukedog]

Carbs say 13745427 on top of them. The plate is too dirty to read. Ill try to clean it up and get the wh number.

Its dirty but here is what I have. Is the screw on the side the adjustment screw?

no adjusting wh carbs.. they are what tha jettin' makes 'em....

 

[rjcamel2355]

So the acceleration issue where I'm having to tap the choke for a second. What are the possible causes of that?

 

[Dukedog]

shaft with slot is butterfly shaft... tha plug covers tha idle jet.... there is absolutely nothing ta tweak on tha wh series.. its all in tha jettin'......

 

[rjcamel2355]

Realized it was the butterfly shaft after I glanced at it few more times....

What do you think could be the cause of having to bump the choke during planing dukedog?

 

[Dukedog]

bulb, carbs and/or fuel pump....

 

[Teamster]

Sounds like a fuel issue,....

Here is the best info I have found about that,...

 

[rjcamel2355]

Checked all the fuel lines tightened everything up hose clamps etc. New fuel lines went on when I cleaned the carbs. The fuel pump bolts seemed a little loose so tightened all that up a bit. We will see what happens this weekend with it.

Went ahead and replaced the bulb too.

As always I appreciate the help guys.

 

[444]

Have you replaced the fuel filter and done a fuel pump kit yet?

Also, you did a link and sync after you put the carbs back on?