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Thread: 2.0 Questions

  1. #1
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    2.0 Questions

    I have an 82 150 Mercury Black max. I was wondering how much a set of 33cc heads and a good set of reeds would help these engines. And what rpm's do you guys run them while keeping longevity in mind? Thanks

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    Not sure what cc the stock heads are, you can go down to 26cc with good gas. The vertical 2.0's really like Boyesen reeds, I've seen over 8,000 RPM with them on a stock 2.0. I have had excellent reliability up to 7500 RPM's but you need to make sure you're dealing with a healthy candidate! Keep a good impeller in it and make sure you have a good water pressure gauge hooked up. Keep the prop pitch short and let it wind...

    What hull are you running it on?

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    Quote Originally Posted by nitro_rat View Post
    Not sure what cc the stock heads are, you can go down to 26cc with good gas. The vertical 2.0's really like Boyesen reeds, I've seen over 8,000 RPM with them on a stock 2.0. I have had excellent reliability up to 7500 RPM's but you need to make sure you're dealing with a healthy candidate! Keep a good impeller in it and make sure you have a good water pressure gauge hooked up. Keep the prop pitch short and let it wind...

    What hull are you running it on?
    Thanks for the reply Rat. I should have clarified more on the engine. Its a V6 black max motor, and its up to snuff on mechanical. Carbs just rebuilt, new impeller kit with housing and fresh lower unit oil. It runs great, would just like a little more. I don't have any delusions of grandeur lol, I know it will never be a 225 promax. It is on a 1700 Super Vee norris craft, so pretty lite boat. I would also like to do the exhaust mod to the mid some time.

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    That hull should run out ok with a 2.0. What carbs do you have (WH#)? I know '81 had the tiny venturi and '83 had the big ones, don't know about '82. I would get a set of Boyesens, and some solid mounts if you don't already have them. Installing the mounts will be the perfect opportunity to chunk the liner out of the can and drill it. I would contact James Perry about cutting your heads. He'll know exactly what to do depending on what gas you're planning to run. He cut a set to 26cc for my little 2.0. I would keep an eye out for a light flywheel, your top bearing will thank you if you do long runs at high RPM's.

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    Quote Originally Posted by nitro_rat View Post
    That hull should run out ok with a 2.0. What carbs do you have (WH#)? I know '81 had the tiny venturi and '83 had the big ones, don't know about '82. I would get a set of Boyesens, and some solid mounts if you don't already have them. Installing the mounts will be the perfect opportunity to chunk the liner out of the can and drill it. I would contact James Perry about cutting your heads. He'll know exactly what to do depending on what gas you're planning to run. He cut a set to 26cc for my little 2.0. I would keep an eye out for a light flywheel, your top bearing will thank you if you do long runs at high RPM's.
    Right on, good info rat. The carbs didn't seem tiny, looked real similar in size to my 88 150 engine. I can't quite make out the number but it looks like wh12 or wh17. I am attaching some pics so you guys can take a look. The number plate on the transom mount says the engine is an 82 but once there this old you never know. I'm not familiar with 2 piece heads from the older models so idk if these are 2 piece or not. I will definitely do some solid mounts and will ditch the can then. I know it has a can because it's awfully quite and I like loud lol.
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    Last edited by TNRoostertail; 10-20-2019 at 02:23 PM.

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    Also want to clarify, these are older pics. This was when the engine was on the old procraft hull. The carbs are nice and shiny now and the engine is cleaner lol.
    And as far as rpm's, I would like to turn this little fella around 6200-6500 rpms if thats a stable number.

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    R you sure it's a 82? U got newer head bolt pattern and enrichment, my 82 was old style , u sure not a 83?

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    Quote Originally Posted by Merc 2.5 View Post
    R you sure it's a 82? U got newer head bolt pattern and enrichment, my 82 was old style , u sure not a 83?
    I mean I'm not 100% positive, thats why I posted pics. The serial says its a 1982, but I know in 30 years things can get swapped around and what not.

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    Here is the serial.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Quote Originally Posted by Merc 2.5 View Post
    R you sure it's a 82? U got newer head bolt pattern and enrichment, my 82 was old style , u sure not a 83?
    My '81 had the enrichiner, when you say old style do you mean choke plates?

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    Quote Originally Posted by nitro_rat View Post
    My '81 had the enrichiner, when you say old style do you mean choke plates?
    Yep ,head bolts etc

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    Well I'm kind of confused now. That wont make a difference on reeds or the can will it?

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    Quote Originally Posted by TNRoostertail View Post
    Well I'm kind of confused now. That wont make a difference on reeds or the can will it?
    Sry bud. No difference, cut heads , reeds, can, prob a rejet to

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    Rooster, your motor has the newer style enrichiner. That's good. With the old style choke plates you had to crank the motor over for 20 or 30 seconds to start drawing fuel in. PITA!!!

    You also have the late style heads, again, a good thing. You can upgrade to the newer style one piece heads for a slight improvement in cooling.

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    Thanks guys thats good to know. Does anyone ever just sell precut 1 piece heads on here? And is it trust worthy? That way I wouldn't have a turn around. And what do you suggest on rejetting? Thanks again you 2.

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