Topic: Clymers High Performance modifications

[timtune]

Anyone have a copy of this manual? I'm missing the back pages and I'm curious about the hipo mods for "track, sport, touring"

[BenelliSEI]

Pretty sure I do. Will have a look.

[timtune]

Thanks. Got the book decades ago with a basket case. Been curious ever since.

[1080]

My copy starts with Chapter Twelve Performance Improvement page 191-212. Page 213 has a list Manufactures & Services.  Index starts on page 214-216, and then there is 8 pages of colored electrical diagrams K1,K2,K3-K7, K8, CB750F 1977, CB750F 1978, CB 750A,and lastly CB750 U.K. Lots of scanning.

[timtune]

I have a later printing which is the same for most of the book. So I have all the wiring diagrams and such. I'm just missing the performance mods.

Don't need them scanned, even a breif outline would be good.

[dragracer]

I have one at the shop. I'm fairly certain it's complete.  Will check for you a little later.

[Don R]

 I forgot to look, mine would be easy to scan since the binding is gone and it's a stack of pages.

[timtune]

Look close. You can see the bulldog clip holding mine together.

[dragracer]

Apparently mime doesn't have a section with performance mods included.  Hopefully someone else can help you out.

[CycleRanger]

Apparently mine doesn't have a section with performance mods included.  Hopefully someone else can help you out.

Yeah, I checked my copy and it's the same, no mention of performance mods.
They must have dropped that from the later editions.

[Jerry Rxman Griffin aka MuthaF'er]

Mine is apparently a 1976 edition with no performance section.

[scottly]

Suspension: rear shocks, swing arm bushings, aftermarket swing arms, front forks, fork springs, fork damping assembly, fork replacement, wheels (Morris Lester Comstar), brakes, tires, kit bike (Rickman).

Engine: exhaust, air cleaner, ignition, oil cooler, engine stages, camshaft, big bore kit, lightened alternator, connecting rods, balancing, cam chain, carburetor, clutch, transmission, cylinder head.

[PeWe]

Search the forum here for modifications. There are many live examples about smaller and bigger mods.

A stock CB750 can become more fun with a little bit more compression and exhaust that breath, not HM341 4-4.  Yamiya No Numbers 4-4 or HM300 4-4 or a 4-1/4-2-1 yes.

My CB750 K2 got that.
Good head with fresh guides/valves + fresh bore/pistons are essential, modified or stock.
Terry in Australia has a K0 he gave higher compression pistons that runs fine.

My K6 got the full package $$$$$!
Finding a newer but used bike with more power from the very beginning should have cost me around half of the go fast parts with reinforcements.
But I married that bike early 1979 and cannot say no when she begs for more over and over again!!

Hondaman's (Mark Paris) book has also descriptions of modifications to do and how.

Over 836cc /+8000rpm the package will need more money with better rods. That was written in an old magazine where Mr Yoshimura talked about tuning a CB750. That is attached deeper down in this forum.

These engines are very old now, update of the primary drives cush rubbers can be a good idea. Not on my list 35-40 years ago.
Holy crap what time goes by!!!

[Alan F.]

Mine is a later printing too, sorry.

[MRieck]

I have that section in my old Clymers

[Don R]

I found my Clymers and began to scan it before I noticed it's a gl1000 book. Fooey. Mostly about parts you can't buy anymore. My Chiltons is a 750 book and also a stack of pages. Looks like it was stored in an oily towel or a coal mine and no performance section either.
 The book with the performance section has a banner across the top referring to RC engineering and a logo in the top right corner that says color wiring diagrams.

[commander60]

I have a Clymer with hipo mods in it, really cool, let me know if i can help.

[timtune]

Can you briefly tell us some of the suggested mods?

[commander60]

Rear shocks, swing arm bushings, fork springs, heaver oil, lighter wheels, brakes, double disc's tires,
Engine, carbs, cam, exhaust, larger bore, air cleaner, high output ignition.
It talks about stage one, two, and three engines
There are a couple of cool pictures, like RC engineering bike with some Weber's and a Cobra engine.
If it is aloud, I can scan the whole section.

[PeWe]

Another good read for CB750 owners with upgrade thoughts.
http://forums.sohc4.net/index.php/topic,38253.msg393997.html#msg393997

Found the Yoshi article. I attached it a few years ago;)
http://forums.sohc4.net/index.php/topic,147470.msg1679064.html#msg1679064

Russ Collins Cobra engine build article.
http://forums.sohc4.net/index.php/topic,176295.msg2050421.html#msg2050421

Lets hope you'll get the Clymers tuning pages too.

[mick7504]

Hoping that this helps out.
These pages haven't seen the light of day for a very long time.

[johno]

Ahh Mick, they were the good ol days mate, every word written about hi po 750 Honda was like reading a bible. I reckon I spent more on magazines than on my bike.  Thanks for the post.
cheers Johno

[mick7504]

Ahh Mick, they were the good ol days mate, every word written about hi po 750 Honda was like reading a bible. I reckon I spent more on magazines than on my bike.  Thanks for the post.
cheers Johno

How are you going Johno
Yes they were good days mate and a lot of fond memories taking down to the wire and a bit beyond and we got away with it.

[PeWe]

Fun info.
This together with Action Fours and Russ Collins catalogs nice reading before Christmas whenever it was supposed to happen. Just order when you want it to happen;D

I'm really pleased that the go fast parts got a comeback 35 years after bike stopped to be made thanks to CycleX, Dynoman, APE, Webcam, Megacycle, Mike Rieck and others.
Parts better than ever.

I synched my carbs today and got it to idle really nice. Like a nice stocker with a little bit harder sound, absolutely not as 125-75 cam numbers can be thought to act.
I need to find one more. It would be horrible if not having a spare before production is stopped.

[MRieck]

Fun info.
This together with Action Fours and Russ Collins catalogs nice reading before Christmas whenever it was supposed to happen. Just order when you want it to happen;D

I'm really pleased that the go fast parts got a comeback 35 years after bike stopped to be made thanks to CycleX, Dynoman, APE, Webcam, Megacycle, Mike Rieck and others.
Parts better than ever.

I synched my carbs today and got it to idle really nice. Like a nice stocker with a little bit harder sound, absolutely not as 125-75 cam numbers can be thought to act.
I need to find one more. It would be horrible if not having a spare before production is stopped.

I can get you a 125-70 cam anytime you want Per.....they are all hardwelded now so all you need is a donor cam and i have a number of them on hand.

[PeWe]

Fun info.
This together with Action Fours and Russ Collins catalogs nice reading before Christmas whenever it was supposed to happen. Just order when you want it to happen;D

I'm really pleased that the go fast parts got a comeback 35 years after bike stopped to be made thanks to CycleX, Dynoman, APE, Webcam, Megacycle, Mike Rieck and others.
Parts better than ever.

I synched my carbs today and got it to idle really nice. Like a nice stocker with a little bit harder sound, absolutely not as 125-75 cam numbers can be thought to act.
I need to find one more. It would be horrible if not having a spare before production is stopped.

I can get you a 125-70 cam anytime you want Per.....they are all hardwelded now so all you need is a donor cam and i have a number of them on hand.

Thanks Mike!
I have had thoughts about that the last weeks. I have asked a friend if he has in his hidden boxes. Probably not.
Next is asking you. The setup now need a Dyno run. Then in with the welded one and check again.

[Don R]

 An excellent read, my question is the reference to the F and A light flywheels. I assume they are referring to the standard non heavy flywheel used after the K0's?  If F and A had a lighter one, I need to take a scale out to the shop to find them. L0L.

[Jerry Rxman Griffin aka MuthaF'er]

Don, from what I've seen there are 3 stock rotors. The boat anchor, the "standard" one and the later lighter one. By all means weight what you have. 

[scottly]

Jerry, I think there are only two different rotors: the early type with the flange, and the later type without the flange. My K1 with the flange weighed about 5.8 pounds, and the K7 rotor without the flange that I'm using now weighs about 4.6 pounds. Almost 1/2 pound more can be removed from the late rotor without losing any charging capabilities, but the RC claims of removing 3 or 4 pounds off even the heavier 5.8 pound rotor and still having any charging at all are way off.
Your pic from the last time this came up shows an early rotor on the left, and two modified rotors on the right; neither is the stock late rotor. As far as when did they start, does your F0 have the early rotor or the late style?

[PeWe]

Alternators
K6 lightened early 80's, still used and working fine. No charging issues.
Stock later alternator.

[Jerry Rxman Griffin aka MuthaF'er]

I'm with you on this Scottly. My F has/had the later rotor.

I'm sitting on a lightened RC rotor that has half the threads stripped. The outter threads. What a #$%* to remove. It resides in my stash now. Suggestions to reuse?

[MRieck]

I'm with you on this Scottly. My F has/had the later rotor.

I'm sitting on a lightened RC rotor that has half the threads stripped. The outter threads. What a #$%* to remove. It resides in my stash now. Suggestions to reuse?

A paperweight Jerry.