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Author Topic: 700 Twin Camshaft Replacement  (Read 840 times)

High On Octane

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700 Twin Camshaft Replacement
« on: April 07, 2014, 09:36:37 PM »
Does anyone know the specifics of how to replace the camshafts in a 700 twin without disassembling the motor?

Scottie J
Scottie J  ~  Bulldog Kustoms Denver  ~  1958 Enfield/Indian Trailblazer  ~  1959 Enfield/Indian Chief

Blltrdr

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Re: 700 Twin Camshaft Replacement
« Reply #1 on: April 08, 2014, 03:07:04 AM »
I'm looking at the diagrams on Hitchcock's and it looks like the only option is to split the case. What a PITA!
2003 Classic 500 5 spd
1992 Kawasaki ZG 1200 Voyager XII
1977 Yamaha XS 360-2D (Cafe Project)

High On Octane

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Re: 700 Twin Camshaft Replacement
« Reply #2 on: April 08, 2014, 03:14:38 AM »
NAY!!!  I just looked at my Super Meteor manual in the garage and all you have to do is pull the timing sprockets and chain and the 3 screws holding the cam bearing cap, and they slide right out by compressing the valve springs and rotating the camshafts.  Freaking SWEEEEEEEET!!!

Now I just have to get caught up at work and get the Impreza primed and I am doing a camshaft swap!   ;D ;D ;D

Scottie J
Scottie J  ~  Bulldog Kustoms Denver  ~  1958 Enfield/Indian Trailblazer  ~  1959 Enfield/Indian Chief

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Re: 700 Twin Camshaft Replacement
« Reply #3 on: April 08, 2014, 03:18:35 AM »
I'm probably wrong but looking at the diagram it looks like the lobes of the cam are inside the case. If this is true, then how do you pull the lobe through the shaft hole. Inquiring minds want to know.
2003 Classic 500 5 spd
1992 Kawasaki ZG 1200 Voyager XII
1977 Yamaha XS 360-2D (Cafe Project)

High On Octane

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Re: 700 Twin Camshaft Replacement
« Reply #4 on: April 08, 2014, 03:39:06 AM »
PRE '58 model twins you did in fact have to split the case to change the camshafts.  But in '58, they added covers to end the ends of the camshafts opposite of the timing side specifically with the intents to be able to remove the camshafts without disassembly of the motor.  I just wasn't sure what you had to do.  But after reading the manual it's exactly what I had in my head.  Just loosen the rocker arm valve lash adjusters to put slack in the valve train, and then you just pull on the camshafts slowly as you rotate them, feeling for the cutaway where they cam lobes can slide thru the journals in the case.

Scottie J
Scottie J  ~  Bulldog Kustoms Denver  ~  1958 Enfield/Indian Trailblazer  ~  1959 Enfield/Indian Chief

Blltrdr

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Re: 700 Twin Camshaft Replacement
« Reply #5 on: April 08, 2014, 03:56:00 AM »
This what I am referencing. Don't see the covers. You will also have to pull push rods. The covers that you describe make complete sense.

http://www.hitchcocksmotorcycles.com/partsbooks/pages/657/Engine_Unit_&_Crankcase_Assembly
http://www.hitchcocksmotorcycles.com/partsbooks/pages/654/Timing_Cover_&_Timing_Gear_Assembly

2003 Classic 500 5 spd
1992 Kawasaki ZG 1200 Voyager XII
1977 Yamaha XS 360-2D (Cafe Project)

High On Octane

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Re: 700 Twin Camshaft Replacement
« Reply #6 on: April 08, 2014, 04:10:42 AM »
The caps are on the primary side of the motor.

Scottie J  ~  Bulldog Kustoms Denver  ~  1958 Enfield/Indian Trailblazer  ~  1959 Enfield/Indian Chief

Blltrdr

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Re: 700 Twin Camshaft Replacement
« Reply #7 on: April 08, 2014, 04:15:07 AM »
I didn't see that in the diagram. Makes sense now. Still will be a little bit of work. So you will have to remove the rockers and push rods. Hopefully the swap gets you the right power band.
2003 Classic 500 5 spd
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1977 Yamaha XS 360-2D (Cafe Project)

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Re: 700 Twin Camshaft Replacement
« Reply #8 on: April 08, 2014, 04:23:41 AM »
Nope don't even have to pull the top end.  Just take the slack off of the valves to remove the cams and use a screwdriver or such to lift the tappets to get the camshafts back in.  Not much of a chore at all.  :)
Scottie J  ~  Bulldog Kustoms Denver  ~  1958 Enfield/Indian Trailblazer  ~  1959 Enfield/Indian Chief

ace.cafe

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Re: 700 Twin Camshaft Replacement
« Reply #9 on: April 08, 2014, 01:03:51 PM »
What cams are you going to put in there.

High On Octane

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Re: 700 Twin Camshaft Replacement
« Reply #10 on: April 08, 2014, 02:29:53 PM »
They are the .328 lift EX2 stamped cams.  But it looks like I will be installing one on the intake tho, the one lobe on the other cam is so corroded that it isn't at .328 anymore.
Scottie J  ~  Bulldog Kustoms Denver  ~  1958 Enfield/Indian Trailblazer  ~  1959 Enfield/Indian Chief

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Re: 700 Twin Camshaft Replacement
« Reply #11 on: April 08, 2014, 02:46:53 PM »
Ace - out of curiosity, knowing I can have the cams reprofiled for $300 for the pair, what kind of lift on the intake and exhaust would you recommend?

Scottie J
Scottie J  ~  Bulldog Kustoms Denver  ~  1958 Enfield/Indian Trailblazer  ~  1959 Enfield/Indian Chief

ace.cafe

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Re: 700 Twin Camshaft Replacement
« Reply #12 on: April 08, 2014, 03:22:46 PM »
Ace - out of curiosity, knowing I can have the cams reprofiled for $300 for the pair, what kind of lift on the intake and exhaust would you recommend?

Scottie J
Are those heads the same as the ones we have at  at Mondello's? If so, I can use that flow data for reference on this recommendation.

From what I can remember, the stock valves couldn't lift any higher than .400" and probably spring-bound prior to that. So probably your Interceptor cam selection would do pretty well, with lift under .350" max, and somewhere around 112*ATDC lobe center, with high compression pistons. Those are designed to feed 750cc, with higher performance, so they should be a pretty hot ticket for a 700, which you should like. And get the valve springs recommended for the Interceptor model which used those cams.
That's probably as good as you can do, unless you have us do to the Blackhawk, what we are already working on for your LSR engine. And you don't want both bikes down for undetermined amount of time while it's getting done. So, I think the Interceptor R cam route would be a pretty good idea.
If you don't want it quite as hot as that, you can just use those .328" inlet cam with the stock exhaust cam, and I think that would do pretty well. Get new valve springs for that model that used that cam.
« Last Edit: April 08, 2014, 04:04:46 PM by ace.cafe »

High On Octane

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Re: 700 Twin Camshaft Replacement
« Reply #13 on: April 08, 2014, 05:02:58 PM »
Thanks Tom.  Yes the heads are identical on the Blackhawk and the Bonnie build.  Like you said I don't want both bikes down at the same time, so for now I will probably just install some new valve springs and throw that .328 cam on the intake side.  I'm going to try and clean up the other cam on the belt sander and see what I can come out with. Not holding my breath on it tho.

Scottie J
Scottie J  ~  Bulldog Kustoms Denver  ~  1958 Enfield/Indian Trailblazer  ~  1959 Enfield/Indian Chief

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Re: 700 Twin Camshaft Replacement
« Reply #14 on: April 09, 2014, 11:26:25 AM »
Well, the camshaft lobes turned out better than I had hoped for.  I got both lobes on the camshaft practically identical.  Unfortunately in order to clean all the corrosion off of the one lobe I had to take the lobe down to .2975 lift, they way the shaped out I'll have another 2 or 3 degrees of duration, but I'm not sure I have enough lift anymore for it to really do more good than harm to the performance.  So I'll probably just end up using the one camshaft for now.  That is, unless Ace thinks that the trade off between lift and duration will pay off in the end.  I realize I have to install these in the motor and turn it to see what they actually do.  So maybe if they intake is fairly easy to install I'll go ahead and put the other cam in there just to see "what if".
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Scottie J
Scottie J  ~  Bulldog Kustoms Denver  ~  1958 Enfield/Indian Trailblazer  ~  1959 Enfield/Indian Chief