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Discussion Starter #1
Has anyone got any info on the stuff they made? I Just got a R/C motor and its pretty rad. It is supposidly 1300cc
 

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DOHC or SOHC? Honda or another motor? Pics? Specs? Details?

I doubt it is 1300cc if it is a honda motor. 1300cc is way too big for any air cooled street motor anyway. The biggest I have heard from them is 1090cc. I own a ton of R/C engineering stuff for SOHC cb750s (enough to build a complete 1036cc drag motor plus spares), What do want to know?

Russ collins is still around BTW, he does FI stuff with cars now. You can drop him an e-mail and he seems pretty helpful.

R/C stuff was pretty good back in the day but I have heard from several credible sources that the pistons have started to suffer from strees cracks and other maladays. Basically the really big stuff was meant for drag racing and had very short service lives. The yosh stuff supposedly hold up much better. But hey if your engine runs good run it till she breaks then take the pistons to wiseco and have them make you a new set.
 

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Discussion Starter #3
Its a sohc and as soon as i ic it up ill get some specs. It cant be run on the street no fins on the cyclinders and the walls are paper thin.
 

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quote:
Its a sohc and as soon as i ic it up ill get some specs. It cant be run on the street no fins on the cyclinders and the walls are paper thin.
Is it watercooled? There used to be a trick of welding a plate over the fins and converting the bike to liquid cooling.

snap some pics lets check that biznitch out
 

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Discussion Starter #5
well im going on vacation so as soonas i get back on wednsday ill get some pics. And no its not watercooled but that would be a good idea. The bike supposidly ran pretty good.
 

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quote:
so not water cooled, and no fins? is it an alcohol drinker?

'72 cb750
'76 cb550
Could be. However when you consider that it only had to work for 1/4 mile at a time then you could run it on nitromethane and it wouldn't matter.

Unless you are racing drag brackets or vintage drag classes in the NDBA I don't really see the usefulness of a motor like this. You can't use it on the street and Hondas are not tradionally competetive in the same way kawasaki z1s and suzuki GSs are. SOHCs used to rule but once people started to make real hp with the kz900 and 1000 motors even the R/C double and triple engined dragsters couldn't keep up.
 

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Discussion Starter #8
Ok i picked up the bike and i will post pics tonight but i saw it has a gerex ignition system. Everything looks to be there which is cool but its all disconected. Anybody got any info on this kit for a 750 or similar bike? Anyone interested in buying it lol
 

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quote:
Ok i picked up the bike and i will post pics tonight but i saw it has a gerex ignition system. Everything looks to be there which is cool but its all disconected. Anybody got any info on this kit for a 750 or similar bike? Anyone interested in buying it lol
I always am interested in cb750 drag racing parts. you might be too far for me but forward air does ship.....

The gerex ignition (I am not 100% sure on that name) should be a heavy duty magneto similar to a joe hunt, ARD, and others. A real nice thing to have, your bike could be exploding to pieces all around you but as long as that mag keps turning she'll keep firing.

pics doood!
 

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can you take a measurement on those pistons? I think the piston kit and cylinder block like that were sold as a set as 1036cc kits. I looks like some of the pistons are missing their nylon retainers.

The ignition you showed is not a mag but is an early crude electronic ignition. Probably better than a martek440.

I am a little buys this weekend, but I will respond in full later. There are a lot of really neat trick things there.
 

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Discussion Starter #13
Yea ill measure them but i just realized the head is junk today bummer. but at least it has retainers and springs. I am prolly gonna sell the ignition system cause i have no need for somthing like that.
 

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Ok here is a quick rundown:

pic #1: gerex box. Don't know what this is but it looks like a cdi box. From the pics I gather you have a non-mag points replacement setup which would work on a street bike. I would adivse keeping it if it works.

pic #2: 16" harley rim laced to a honda stock hub. Good for getting a wider tire on the back and made old time drag slicks easier to fit. Heavy.

Pic #3: stock honda front disc setup with polished lower legs

Pic #4: clubmans and a K0 top clamp. That top clamp is usually worth boko bucks. It only works with the earlier gauge mounts. If you don't care about gauges get a k2-k6 top clamp and use that instead.

Pic #5: custom seat. who knows who made it but I kinda dig it.

Pic #6: looks like a stock head with some minor head work and maybe big valves. I would check to see if those valves are stainless or titanium since both were available as a hopup

Pic #7: Tank. Is it fiberglass or metal? if glass it is probably a tracy or a fiberglass works tank. If metal then who knows. It is cool though.

Pic #8: The other part of the electronic ignition. Looks like points replacement type cdi. looks clean. Since it works in place of points with the stock charging system I would keep it.

Pic #9: Looks like KZ900 or GS750 carbs. A popular back in the day hop up part. If you want to go back to stock carbs I'll buy the setup off you. Since they are street carbs with a choke you can run them on a cafe street bike.

Pic #10: This is the real score of the lot. Box section swingarm and an aluminum rim laced to a stock hub with stainless spokes. can;t tell if the swinger is steel or alloy or who made it but it is cool and cb750 aftermarket swingarms tend to be rare.

Pic #11: I know very little about murray pipes but from what I heard they were very very good.

Pic #12: RC cylinder block and pistons. Very rare. Not a street part but really neat. I would hang these on the wall of my house If I owned them. They are pretty much a drag race only part.

that is all I have time for now. although given the parts you have I would not be surprised if those valve springs and retainers were titanium. #16 is an airshift setup btw. neat to have on a street bike when you want to make full throttle powershifts.
 

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Discussion Starter #16
Im thinking i might get rid of the pistons and cylinders. What r these things worth? any offers?? They cant be run on the street and are roughly 73mm bore.
 

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Discussion Starter #17
Im thinking i might get rid of the pistons and cylinders. What r these things worth? any offers?? They cant be run on the street and are roughly 73mm bore.
 
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