KH7 Cruiser

Mercury Outboard  general discussion

KH7 Cruiser

Postby 1500J » Tue May 01, 2018 3:03 pm

Picked up this diamond in the rough yesterday.   Is seems to be fairly complete minus the flywheel.   Someone decided to replace the coils and then gave up and apparently did not get the flywheel back on .

Pretty cool motor.  Was this the first Forward N  Reverse motor produced by Mercury?  Not sure exactly what my plans are. But for now Ill clean it up a bit and get it hung on the wall until I figure it out.

C
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Re: KH7 Cruiser

Postby 1500J » Tue May 01, 2018 3:05 pm

I read that they needed a water pump upgrade.  I assume this one has it done.  I appears it has a tell tale added to in the block.  P stamp by holes.
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Re: KH7 Cruiser

Postby 1500J » Tue May 01, 2018 3:07 pm

Looks like the original powerhead.  Numbers match the clamp.

What did KC stand for on the block seal?
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Re: KH7 Cruiser

Postby Fingerlakeskid » Tue May 01, 2018 3:20 pm

Kiekhaefer Corporation
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Re: KH7 Cruiser

Postby Fingerlakeskid » Tue May 01, 2018 3:22 pm

The KH7 share a lot of parts with a Mark 20, I'm sure we can come up with the parts you need to put your motor back together. Nice find! And so the two cylinder addiction begins!
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Re: KH7 Cruiser

Postby Bob » Tue May 01, 2018 4:06 pm

The Cruiser are one of my favorites that I have.  I would give up other motors I have before a Cruiser.
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Re: KH7 Cruiser

Postby SteveC » Tue May 01, 2018 4:14 pm

I may have an extra flywheel.  I know I have two, just have to be certain I am not going to use it.  My most recent KG-7 was Phelon, but it is also missing the flywheel.   icon_thumbdown.gif   I hate to admit, but I may end up converting this one from Phelon to Scintilla!   :shock:  :lol:   We will see.  In any event, your lower unit has gone through the modification to the new water pump.  What gives it away for me is the original lower unit only had 1 set of holes, on the bottom of the starboard side.  In addition to the different impellor, one of he modifications was to add 6 holes each about 10:00 and 2:00 on the housing.  What happened to a lot of these was that folks thinking that if a few holes is good, then more is better, and they turned them into pin cushions and the broke there.  I think these are great motors, the final green tank Merc, and a real transition motor for them.  Welcome to the two cylinder club!  

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Re: KH7 Cruiser

Postby 1500J » Tue May 01, 2018 6:56 pm

Thanks guys.  I emailed the guy I bought it from asking if he had the flywheel someplace still.  Maybe he forgot he took it off.  He didnt know much when I go it.
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Re: KH7 Cruiser

Postby 1500J » Tue May 01, 2018 8:44 pm

So this requires a Bendix Scintilla coils it looks like. Where do you find them?  There is a guy selling them online but it looks like some modifications are needed. C
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Re: KH7 Cruiser

Postby chuckw » Tue May 01, 2018 10:15 pm

Talk to Bob v dingracer. He has several solutions for Bendix mags.
KG7(4), Mark20H(2), 20H conversion, KF7(4), KE7, KH7, 25SS, KG7H(3), KG7Q, KG4Q, Mark 15 pumper, Mark 25Q, Mark 15, Mark 20, Mark 25(5), KG4, KF5, KD4, KD3, KE4, Mark 7, WG7, WN7, WM7A, Mark 20 rat.
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Re: KH7 Cruiser

Postby Tom Brockmeyer » Tue May 01, 2018 10:49 pm

1500J wrote:  Was this the first Forward N  Reverse motor produced by Mercury?


Nope!  The 1957 Mark75 was forward/reverse & silent neutral !!
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Re: KH7 Cruiser

Postby dave bernard » Tue May 01, 2018 10:50 pm

yes it was 1952
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Re: KH7 Cruiser

Postby Ram Jet » Sat Sep 08, 2018 5:14 am

My new find.  It will push an old Sears 11''6" hull.
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Re: KH7 Cruiser

Postby SteveC » Sat Sep 08, 2018 3:17 pm

Nice looking Cruiser!  You better hold on with that KH-7 on that little Sears boat!  These are a real transition motor for Mercury as they were a one year only motor, as they were basically a cross between a KG-7 and a Mk-20.  I have two of them, but have to spend some quality time on the water with them for sure.  (So many projects to get on the water, it is funny that the KH-7's have not had much of a turn yet.   [violin.gif]  

Oh well, we are at 23 of our own motors on the water so far, and another 8 that belong to family and friends.   Still reaching for that magic number of 30 (of our own) on the water in a season.  

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Re: KH7 Cruiser

Postby Genel » Sat Sep 08, 2018 3:48 pm

Ram Jet, be careful, that may be too much motor for that little boat.  Ran my Kg-7 on a shallow 14 foot Alumacraft, very scary.
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Re: KH7 Cruiser

Postby mercaholic » Sat Sep 08, 2018 4:49 pm

Bob wrote:The Cruiser are one of my favorites that I have.  I would give up other motors I have before a Cruiser.
Bob


:arrow: I agree.

Every KH7 that I had worked on delivered great performance, moreso than the Mk20's I had.  Not sure why that was the case tho.... :?:
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Re: KH7 Cruiser

Postby chuckw » Sat Sep 08, 2018 8:41 pm

Recently ran my KH7. Great motor. Ran and idled very well. icon_thumbup.gif
KG7(4), Mark20H(2), 20H conversion, KF7(4), KE7, KH7, 25SS, KG7H(3), KG7Q, KG4Q, Mark 15 pumper, Mark 25Q, Mark 15, Mark 20, Mark 25(5), KG4, KF5, KD4, KD3, KE4, Mark 7, WG7, WN7, WM7A, Mark 20 rat.
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Re: KH7 Cruiser

Postby Yellowjacket » Sat Sep 08, 2018 9:25 pm

The first motor I had as a kid was a KH-7..  

Always ran like a bear after I got new coils in it...  Had it on a series of small 8 foot boats including a Minimax, a homebuilt boat that looked like a miniature airboat, and finally a yellowjacket hydro build from the Popular science plans.   Always was a great motor.
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Re: KH7 Cruiser

Postby Ram Jet » Fri Feb 15, 2019 6:13 am

1500J wrote:So this requires a Bendix Scintilla coils it looks like. Where do you find them?  There is a guy selling them online but it looks like some modifications are needed. C


Bendix/Scintilla coils are as scarce as hen's teeth.  You can convert what they call "Two Spark" coils that can be found on eBay.  I did it and they do work but that is your only chance at coils.  I just converted my Bendix mag to a Phelon.  Figure on over $350.00 for all he parts you'll need - magneto, points cam and flywheel and probably new coils.  Even parts for the Phelon are getting scarce.

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Re: KH7 Cruiser

Postby mercaholic » Fri Feb 15, 2019 1:26 pm

Ram Jet wrote:
1500J wrote:  Figure on over $350.00 for all he parts you'll need - magneto, points cam and flywheel and probably new coils.  Even parts for the Phelon are getting scarce.

Bill


Keep in mind that converting the Phelon coil laminates onto OMC coils will bring the cost down but at the expense of mod's to the flywheel for plug wore re-routing.  It's worth the effort as you will get a nice hot spark tho.... :arrow:
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Re: KH7 Cruiser

Postby buff5 » Fri Feb 15, 2019 3:04 pm

Yes, Dave is right, the KH7 was a one year motor,1952 & the FIRST gear shift motor Mercury produced. It falls in between the KG7 & MK 20 as Dave also said, nice engine, I have had a couple of them BUT they are HEAVY!!
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Re: KH7 Cruiser

Postby Ram Jet » Sat Feb 16, 2019 10:14 am

Genel wrote:Ram Jet, be careful, that may be too much motor for that little boat.  Ran my Kg-7 on a shallow 14 foot Alumacraft, very scary.


Back in the 60's I built a Minimost that was supposed to be 8' long.  Mine was 7' intentionally.  I ran a Mark 20 on it and I'm still here.  A KH7 might be a-lot of engine for a 11'6" boat but that's why the KH7 has a throttle.  I have to admit though the Mark 20 would pop the Minimost clear of the water with full throttle on the dead man's throttle.

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Re: KH7 Cruiser

Postby mercaholic » Sat Feb 16, 2019 2:25 pm

I've always maintained that there was something unique about the performance of any KH7.

All the ones I've owned ran exceptionally strong once both cylinders had spark to them.... [fingerscrossed.gif]
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Re: KH7 Cruiser

Postby Yellowjacket » Sat Feb 16, 2019 7:45 pm

Had one when I was a kid and it was a great motor..

When you think about it, the KH7 was almost the first "modern" Merc it was the transition between the older motors and what we would refer to today as a fully featured outboard.  It had a full gear shift and a twist grip throttle.  While it still had the fuel tank on the motor (like most "old" motors" that came before it), that was the only feature that kept it from being a fully modern design.  Motors before that had the throttle on the front of the motor and unless you a had a deadman, you couldn't really use it on a pretty fast boat.  With the twist grip you could readily control the throttle and that was a huge step forward.  Similarly, the full gear shift was a big step up from the "pull and go" of the early small motors.  While a remote fuel tank is a much better solution, that didn't come until the next year.  The motors that came out the next year were "fully modern".  By that I mean that they had all of the basic features that you'd expect in a modern outboard, the only difference from that time on came in small steps and in levels of refinement, but by 1953 all the basic features were there.

The small boats I had as a kid didn't have places for steering or a deadman and the twist grip throttle was a really important feature.  While I'd have liked to have a steering wheel and remote throttle, we never had money for that fluffy stuff and the KH was the perfect motor for us.  Later motors with remote tanks were more in demand, and KH's were cheap...  We improvised by making a "marathon" cap by modding the fuel tank cap so we could put a tank in the boat and pump fuel with the squeeze bulb whenever we figured that fuel was low..  We'd just squeeze in fuel until we saw it running out the vent and keep right on going...
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Re: KH7 Cruiser

Postby mercules » Sat Feb 16, 2019 11:15 pm

From my 1951 catalog, note the gage in front.
1951-catalogcruiser.jpg
Let's fix it now - before we launch the boat.
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Re: KH7 Cruiser

Postby Ram Jet » Sun Feb 17, 2019 2:42 am

1500J wrote:Picked up this diamond in the rough yesterday.   Is seems to be fairly complete minus the flywheel.   Someone decided to replace the coils and then gave up and apparently did not get the flywheel back on .

Pretty cool motor.  Was this the first Forward N  Reverse motor produced by Mercury?  Not sure exactly what my plans are. But for now Ill clean it up a bit and get it hung on the wall until I figure it out.

C


I highly recommend this publication.  Worth every penny!

 https://www.ebay.com/itm/Vintage-Mercur ... XQU6tQ~Jje

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Re: KH7 Cruiser

Postby 1500J » Thu Mar 14, 2019 3:49 am

Curious about the KH7 gas tank .  Is it shared with other K models?  My tank has a few dents .  Wondering if anything else will swap right in there if I stumbled onto something in better shape.  

Thanks
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Re: KH7 Cruiser

Postby SteveC » Thu Mar 14, 2019 4:15 am

1500J wrote:Curious about the KH7 gas tank .  Is it shared with other K models?  My tank has a few dents .  Wondering if anything else will swap right in there if I stumbled onto something in better shape.  

Thanks


Yes, it is the same tank as the late production 1950 KF-7's and the KG-7's.  I don't have a KG-4, so I am not certain of that tank, but I believe it to be the same also.   The earlier tanks (KE-7 and 1949 KF-7's) were only different in the size of the fuel cap threads, and the fuel filter assembly on the bottom.  

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Re: KH7 Cruiser

Postby 1500J » Thu Mar 14, 2019 7:40 pm

Thank you Steve!

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Re: KH7 Cruiser

Postby kirkp » Sat Mar 16, 2019 1:22 am

White papers possibly to the rescue. According to the Where Used Book, that tank is shared on the KH7, KG7, KG4, KF7 and KE7.
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Re: KH7 Cruiser

Postby 1500J » Sat Mar 16, 2019 2:00 pm

Good work Kirk.

Thanks!
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Re: KH7 Cruiser

Postby kirkp » Sun Mar 17, 2019 3:11 am

Hey Conrad, hope what I posted is of some help although if I were you I'd listen to Steve. It's obvious he's street smart and I'm book smart (might be questionable). What he said about some of the possible differences sent me back to the where used book which indicates that:
- the gas cap is supposed to be used on KE4, KE7, KF3, KF5, KF7, KG4, KG7 and the KH7.
- the filter is used on KE7, KF7, KG4, KG7 and KH7.

Looking at common denominators, it would appear that the KE7, KF7, KG4, KG7 and KH7 have the correct combination of filter type and cap style to be interchangeable. Steve is talking about earlier serial number so it sounds almost as if some of the tanks may have had mid-range changes? I don't have a clue but it's fun to dig thru the papers and hopefully learn something.

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Re: KH7 Cruiser

Postby SteveC » Sun Mar 17, 2019 4:29 am

[

Looking at common denominators, it would appear that the KE7, KF7, KG4, KG7 and KH7 have the correct combination of filter type and cap style to be interchangeable. Steve is talking about earlier serial number so it sounds almost as if some of the tanks may have had mid-range changes? I don't have a clue but it's fun to dig thru the papers and hopefully learn something.

Kirk[/quote]


Yes, the early and later tanks are the same size, the difference is the size of the gas cap, and the fuel filter assembly.  The later tanks had a large element filter assembly that threaded into the bottom of the tank, 1 1/16" I think, but just a guess at the time.  In any event, the early tanks had just a small screen type filter in the tank that was 3/8 pipe (again, just a guess, but an obvious difference)  As I said, they are the same size, but to be correct, the early tanks went with the pre mid-1949 production of both the KE-7 & KF-7.  The reason the "where used" book list them all, is that they were the replacement, and the new tank just superseded the old one.  If you were to replace your tank with the newer one, you needed to get the gas cap and filter assembly.  They may have come as an assembly anyway at the time.  

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Re: KH7 Cruiser

Postby kirkp » Sun Mar 17, 2019 7:30 am

Thanks Steve.
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Re: KH7 Cruiser

Postby 1500J » Sun Mar 17, 2019 3:52 pm

Thanks guys.  Appreciate it.
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Re: KH7 Cruiser

Postby Ram Jet » Mon Mar 18, 2019 8:31 am

mercules wrote:From my 1951 catalog, note the gage in front.
1951-catalogcruiser.jpg


Funny.  This ad photo shows a different prop (3 blade) mine is a two like the Mark 20, shift lever and it doesn't look like a twist-grip throttle.  I've seen some ad photos of the KH7 pulling two water skiers - I'm not sure it has enough power to do that.

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Re: KH7 Cruiser

Postby Ram Jet » Mon Mar 18, 2019 8:41 am

SteveC wrote:[

Looking at common denominators, it would appear that the KE7, KF7, KG4, KG7 and KH7 have the correct combination of filter type and cap style to be interchangeable. Steve is talking about earlier serial number so it sounds almost as if some of the tanks may have had mid-range changes? I don't have a clue but it's fun to dig thru the papers and hopefully learn something.

Kirk



Yes, the early and later tanks are the same size, the difference is the size of the gas cap, and the fuel filter assembly.  The later tanks had a large element filter assembly that threaded into the bottom of the tank, 1 1/16" I think, but just a guess at the time.  In any event, the early tanks had just a small screen type filter in the tank that was 3/8 pipe (again, just a guess, but an obvious difference)  As I said, they are the same size, but to be correct, the early tanks went with the pre mid-1949 production of both the KE-7 & KF-7.  The reason the "where used" book list them all, is that they were the replacement, and the new tank just superseded the old one.  If you were to replace your tank with the newer one, you needed to get the gas cap and filter assembly.  They may have come as an assembly anyway at the time.

Steve (quote)

The fuel filter socket required fo fuel filter removal is 1 3/8'.  If you have the original sintered bronze fuel element lose it for the nylon mesh one (Kiekhaefer service bulletin recommendation).

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