Author Topic: 1973 CB750 Custom Build on Hack A Week (Read 102985 times)

Artfrombama · « **Reply #200 on:** March 06, 2016, 10:22:06 PM »

Additional wire retainers

I believe this retainer (below) is for the carburetor overflow tubes and the battery vent.

Entire album> http://s6.photobucket.com/user/Artfrombama/library/CB750%20Overhaul

Dino · « **Reply #201 on:** March 07, 2016, 04:14:26 AM »

Great reference material! Thanks!

MCRider · « **Reply #202 on:** March 07, 2016, 08:37:40 AM »

Consider routing the battery tube to the far right as possible. Zip tie to centerstand mount or such. Because... (first post) http://forums.sohc4.net/index.php/topic,102388.0.html

Dino · « **Reply #203 on:** March 07, 2016, 10:32:49 AM »

Good tip. I have an AGM battery in there now so no vent tube to worry about.

SOHC4 Cafe Racer Fan · « **Reply #204 on:** March 07, 2016, 12:24:51 PM »

I suppose the purists will scoff, but I am not a fan of water/lead batteries requiring maintenance.

therobbstory · « **Reply #205 on:** March 07, 2016, 12:27:08 PM »

Quote from: CB750 Cafe Racer Fan on March 07, 2016, 12:24:51 PM

I suppose the purists will scoff, but I am not a fan of water/lead batteries requiring maintenance.

I'm not a fan of the white battery acid petri dish that once was my battery tray. Looking into AGM batteries now.

edwardmorris · « **Reply #206 on:** March 07, 2016, 01:42:04 PM »

Couple more tidbits, sorry if they've already been done.

First, some added sleeving over the neutral switch wire as it is bound to get craploads of chainlube and other debris on it. Easy to tell by the condition of an old one that has seen many miles.

Second is the routing of the breather tubes from the top of the engine and the oil tank. You don't want them in the path of the rear wheel, route them to left side instead and turn them into chain oilers

(I did cut the large hose before riding, pic was taken during assembly).

SOHC4 Cafe Racer Fan · « **Reply #207 on:** March 07, 2016, 01:55:47 PM »

Rafi,

What has your experience been with the breather tube exiting on the chain? Assuming you don't get much oil exiting the tube, it's not a big deal (and not a concern for oil splatter), but I am not so excited about it rubbing against a moving chain.

edwardmorris · « **Reply #208 on:** March 07, 2016, 02:12:52 PM »

Quote from: CB750 Cafe Racer Fan on March 07, 2016, 01:55:47 PM

Rafi,

What has your experience been with the breather tube exiting on the chain? Assuming you don't get much oil exiting the tube, it's not a big deal (and not a concern for oil splatter), but I am not so excited about it rubbing against a moving chain.

I did cut it before I began riding, so far so good and it doesn't grind against the chain, has a good inch or two clearance. Never seen anything come out of there when idle, can't say how much actually makes it down there when riding though. Either way, better away from the path of the rear wheel.

seanbarney41 · « **Reply #209 on:** March 07, 2016, 04:31:10 PM »

Hmm, the crankscase breather, if it's anything like my F3, which has a cap on the end, so that it saves everything up until you release the cap to watch it all spill out, is mostly spewing a sickly snot colored water which is probably full of all the condensated acids...not exactly what I want going on my chain

Dino · « **Reply #210 on:** March 07, 2016, 07:05:33 PM »

To the best of my knowledge the breather hose from the oil tank on a K3 goes to the nipple on the back of the crankcase. The one from the valve cover just vents to the atmosphere down behind the engine.

seanbarney41 · « **Reply #211 on:** March 07, 2016, 07:48:23 PM »

Quote from: Dino on March 07, 2016, 07:05:33 PM

To the best of my knowledge the breather hose from the oil tank on a K3 goes to the nipple on the back of the crankcase. The one from the valve cover just vents to the atmosphere down behind the engine.

that is correct, sorry, don't let my threadjack get you confused. The F3 is different. I just brought it up as an example that EdwardMorris may not want to be using his crankcase vent to lube the chain...

edwardmorris · « **Reply #212 on:** March 07, 2016, 08:15:08 PM »

Yes, the breather of the lower crankcase goes up into the oil tank, but the oil tank has its own breather outlet as well. I'll need to dig up the post but it was recommended to move the valve cover breather hose away from the path of the rear wheel. Same for the breather hose for the oil tank (not the crankcase). It is fine if it isn't oiling the chain, the point really is to keep it away from the path of the rear wheel. Basically nothing more than the carb drain hoses should go back there....

edwardmorris · « **Reply #213 on:** March 07, 2016, 08:27:08 PM »

Found the post

http://forums.sohc4.net/index.php/topic,147504.msg1680491.html#msg1680491

Dino · « **Reply #214 on:** March 08, 2016, 04:22:07 AM »

Good read. Thanks!

firebane · « **Reply #215 on:** March 08, 2016, 06:28:26 AM »

Quote from: edwardmorris on March 07, 2016, 08:27:08 PM

Found the post

http://forums.sohc4.net/index.php/topic,147504.msg1680491.html#msg1680491

Good read thanks! I just took off that stupid separator on my bike and was wondering what I should do... now I know.

yunk · « **Reply #216 on:** March 11, 2016, 07:30:14 AM »

Looking forward to when you are doing your first wheelie with it.

firebane · « **Reply #217 on:** March 11, 2016, 08:52:40 AM »

Quote from: yunk on March 11, 2016, 07:30:14 AM

Looking forward to when you are doing your first wheelie with it.

I normally don't respond to such comments as these.. But really? Do you even watch his videos? The guy takes huge pride in his bike and even goes as far to say no he will not run it open pipe because people were asking.

SOHC4 Cafe Racer Fan · « **Reply #218 on:** March 11, 2016, 09:16:30 AM »

Hahahaha I think I almost laughed up my coffee.

seanbarney41 · « **Reply #219 on:** March 11, 2016, 01:25:15 PM »

Quote from: firebane on March 11, 2016, 08:52:40 AM

Quote from: yunk on March 11, 2016, 07:30:14 AM
Looking forward to when you are doing your first wheelie with it.

I normally don't respond to such comments as these.. But really? Do you even watch his videos? The guy takes huge pride in his bike and even goes as far to say no he will not run it open pipe because people were asking.

lighten up dude...few are the cb750's that can even do a little one. If Dinos' has the pudding, ain't nothing wrong with proving it!

Dino · « **Reply #220 on:** March 12, 2016, 04:44:26 AM »

I don't do wheelies on street bikes. Here's why...

The last one I did was on a 1973 Yamaha RD350 I had back in 1983. I had full race old school fiberglass fairing, tank and seat, rear sets and clubmans. It was a really fun machine. I used to buy stuff for it at a shop called Accessories & Cycles Unlimited in Phoenix Arizona. One day I was showing off in the parking lot doing wheelies and pulled off a particularly long one. I used up a lot of room and when the front wheel came down I was heading towards a parking curb pretty quickly with little run out room. I stabbed the front brake a bit hard right at the moment that the front wheel passed over a patch of sand. The front end washed out and I went down on hard on the left side and skidded to a stop on the parking curb. I ended up with a bloody 6" long road rash on my left forearm and another small one on my elbow. The bike suffered a scratched fairing, torn up handlebar grip, a punctured fuel tank and a scratched seat. The guys from the shop all stood in the doorway laughing their asses off as I got the bike up and wheeled it back over near them and parked it. I received a good natured ribbing as they helped me put a temporary duct tape patch on my fuel tank. I healed up, and the bike got patched up with some fiberglass.

I don't do wheelies on street bikes anymore.

...and I really miss that bike. First one I "did the ton" on.

MRieck · « **Reply #221 on:** March 12, 2016, 05:37:43 AM »

I think most of us have a story like that Dino....at least the guys that have been riding for 30 years or so.

I was watching one of your videos the other day....when you were putting the cylinder head on. I was watching how careful you were not to drop the cam chain down the tunnel (you are very careful about all the stuff you do which is a great thing). It made me remember building an engine for a fella and flipped the chain down the tunnel.....I thought he was going to have a heart attack.

He was OMG...OMG....you have to pull the engine apart now.I remember I went an got an extendable magnet and brought it to the surface. I thought the dude was going to sh!t his pants. My point is the cam chain can easily be retrieved....I don't know where the the notion of the tunnel being a mechanical black hole came from but it isn't true.

Dino · « **Reply #222 on:** March 12, 2016, 08:56:15 AM »

Got busy in the shop Thursday night. It's almost ready for a test drive!

evanphi · « **Reply #223 on:** March 12, 2016, 09:53:19 AM »

Remember to re-check your brake lever travel after you bumped the wheel ahead for the chain adjustment!

Looking forward to the first official test ride video!

SOHC4 Cafe Racer Fan · « **Reply #224 on:** March 12, 2016, 11:57:10 AM »

Getting pretty darn close, Dino!

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Author Topic: 1973 CB750 Custom Build on Hack A Week (Read 102985 times)