Topic: Kenny Harmon D cam specs

[macvit7906]

Installing a Kenny Harmon D grin into a stock cb750F engine.

I'm using stock springs, valves, etc. mentioned here I can use stock springs: http://satanicmechanic.org/kharmoncam.shtml

Any tips on installation or timing differences? What is the correct Valve lash adjustment for this cam?

Mentioned here is .005" intake and exhaust - is this correct?
http://forums.sohc4.net/index.php?topic=144276.0

All help is appreciated!

[david 750f]

Page 34 on the Mega Cycle Cam website. .005 clearance, intake and exhaust.

https://www.megacyclecams.com/

[macvit7906]

Page 34 on the Mega Cycle Cam website. .005 clearance, intake and exhaust.

https://www.megacyclecams.com/

Thanks David,

Mega Cycle say to use HD springs while Satanic Mechanic says stock springs are ok, which is right? It's the only cam I have at the moment - on a budget, I'll be doing very light riding.

Any differences when setting the timing?

[seanbarney41]

I bought a bike that turned out to have Action Fours 812 pistons and KHD cam.  From back in the day, it appears to have stock springs and definitely stock cam gear, so no possibility of degreeing.  I think the KHD is known for haveing a strong top end so I intend to upgrade the springs...will probably get a cam gear too for full optimization.  But the engine I bought had plenty of miles on it with stock appearing springs and non-adjustable cam gear.  My KHD is in beautiful shape, so I would assume they were a quality piece

[Jerry Rxman Griffin aka MuthaF'er]

I installed HD springs with my Yoshimura Daytona cam AFTER I grenaded the engine with a stock 750F cam on a missed 1 - 2 power shift valve float. Insurance is relatively cheap. It has held up ever since. Just depends on how hard you ride IMO.

[macvit7906]

Thanks all for the reassurance.

I'll stick with the stock springs for now, I may upgrade in a few thousand miles, just want to get this thing on the road! The KHD cam I have is also in great shape.

Now as far as setting the timing, I did some research and can't find any info. Should I just time the engine as usual regardless of the cam?

[seanbarney41]

Yes, doing anything else requires the addition of a slotted cam sprocket.  Degreeing a cam with a slotted cam sprocket allows you to compensate for slight manufacturing variance and/or slightly adjust where in the rpm range the cam will make best power.  You would also need a degree wheel,  dial indicator and magnetic base.  This all part of "blue printing" a performance engine build...not required to just make it run.

[macvit7906]

Yes, doing anything else requires the addition of a slotted cam sprocket.  Degreeing a cam with a slotted cam sprocket allows you to compensate for slight manufacturing variance and/or slightly adjust where in the rpm range the cam will make best power.  You would also need a degree wheel,  dial indicator and magnetic base.  This all part of "blue printing" a performance engine build...not required to just make it run.

thank you sir. At this point, I just want to use this cam up and keep everything else as stock as possible. So at this point I guess I'll throw it in and see how it goes!

Along side this build I also have a performance engine. Lightened balanced crank, rotor, cush drive. race gears, cryo treated primary and cam chains. 41A webcam, 836 kit, cylinder bore by m Rieck, as well as a stage 3 head porting and seradi valve job by Mike. Thats where the fun begins 

[PeWe]

Why not a stock cam in stock engine?
My K2 has a K7 cam that look as a 1975 F cam I bought later.
Really relaxing to not time it, just bolt it in.
KHD must be timed to right numbers with slotted sprocket, right?

I read Action Fours cam description where they claimed their cams were made for stock sprocket, no need to time it, only set it correct as a stock cam.

KHD has relatively low lift but longer duration if I remember correctly. Really OK without higher compression pistons? This to get back some compression the overlap will let out thru the exhaust.

[macvit7906]

Why not a stock cam in stock engine?
My K2 has a K7 cam that look as a 1975 F cam I bought later.
Really relaxing to not time it, just bolt it in.
KHD must be timed to right numbers with slotted sprocket, right?

I read Action Fours cam description where they claimed their cams were made for stock sprocket, no need to time it, only set it correct as a stock cam.

KHD has relatively low lift but longer duration if I remember correctly. Really OK without higher compression pistons? This to get back some compression the overlap will let out thru the exhaust.

It's the only cam I have at the moment. On a budget so I don't want to spend the $ on a stock cam.
From the research I've done, the KH D grind can be used as stock everything. I put in a new cam chain, I'll be using stock sprocket and springs, valves, pistons, etc.

I know the KH F and K grinds need some upgrades to run.

[macvit7906]

It's the only cam I have at the moment. On a budget so I don't want to spend the $ on a stock cam.
From the research I've done, the KH D grind can be used as stock everything. I put in a new cam chain, I'll be using stock sprocket and springs, valves, pistons, etc.

Just want to make sure there will be no issues with timing.

I know the KH F and K grinds need some upgrades to run.

[PeWe]

Read Action Fours catalog where the D cam is explained, stock springs may be used but racing springs recommended.
Earlier in same catalog about camshaft explained with lobe design showed. NO STOCK PISTONS WITH ANY CAM WE SELL!

So use KHD with stock pistons a really bad idea!!!  You can also see how to check piston to valve clearance.
Dpwnload the entire manual
https://web.archive.org/web/20170318002305/http://www.satanicmechanic.de/download/Action%20Fours%201979.PDF

found here
https://web.archive.org/web/20180903084749/http://satanicmechanic.org/downloads.shtml

[macvit7906]

Read Action Fours catalog where the D cam is explained, stock springs may be used but racing springs recommended.
Earlier in same catalog about camshaft explained with lobe design showed. NO STOCK PISTONS WITH ANY CAM WE SELL!

So use KHD with stock pistons a really bad idea!!!  You can also see how to check piston to valve clearance.
Dpwnload the entire manual
https://web.archive.org/web/20170318002305/http://www.satanicmechanic.de/download/Action%20Fours%201979.PDF

found here
https://web.archive.org/web/20180903084749/http://satanicmechanic.org/downloads.shtml

Thanks PeWe,

To be safe, I did a quick search on eBay and found the exact year stock camshaft I needed on the cheap! I guess I'll save the KHD cam for a rebore later down the road.

How do you think the KHD would compare to a 41a webcam for an 836cc kit and ported head?