Author Topic: CB 750 Project 1 - Rides Well but a few tweaks needed (Read 116446 times)

timbo750 · « **Reply #250 on:** June 28, 2015, 02:19:13 PM »

I was for some reason compelled to check the length of the speedo cable and where it will sit near the guard mainly because the guards have been shortened from stock. In doing so I noticed that the speedo shaft was not turning when the wheel turned and knew I would have to remove the front wheel to investigate, this is something I did not want to do but decided to tackle it straight away as time was available.

So I worked out a plan to remove both callipers without having to remove the brake lines. Then I discovered issue number 2, leaking brake fluid. I wasn't sure where or how much at first but eventually worked out it was from the piston seal. This I worked out after removing it all from the forks and decided to separate the 2 parts of the calliper with the brake line still attached and you guessed it, I bent the solid brake line. The brake line hopefully isn't too bad and may bend back with gentle persuasion.

Then without really thinking too far ahead I bled out the brake fluid so I could disconnect it all but should of pumped out the piston first. So I then filled the reservoir, removed the air from the line, pushed out the pad and piston and bled out the fluid for a second time. Now to get a new piston seal and hope the brake line can moved back into shape.

As for the speedo drive, I had a few issues when I did the modification for the twin disc, for some reason my front hub is from what I believe to be an early K0 or K1 as it does not have the cut-away that are used to hold the speedo drive and keep it rotating with the wheel. I thought I had this sorted out and was relying on friction to get things to work, no luck there. I am now hoping that I can make a small cut to the hub that will allow the speedo drive plate to rotate with wheel but I suspect that may affect the wheel balance.

Terry in Australia · « **Reply #251 on:** June 28, 2015, 05:42:46 PM »

G'Day Timbo, your KO/K1 hub is also wider than a K2 and later hub, so will give you problems with clearance for the second disc, and of course, the speedo drive issue, so you'd be better off swapping it for a later hub. If you need one, let me know, I'd be happy to swap it for your K0 hub for my K0 project. Cheers, Terry.

timbo750 · « **Reply #252 on:** June 28, 2015, 05:59:49 PM »

Terry, I know about the clearance issues as read heaps before I started the twin disc works and there are no clearance issues with the hub. I have actually had it all mounted up and working and the distance between the disc and forks is almost identical between the left and right. But from what you just said and what I have read around the forum I should have clearance issues?

My preference was not to change the hub as the wheel has been trued, new tyre fitted and balanced, I hate redoing work that has already been done right.

Terry in Australia · « **Reply #253 on:** June 28, 2015, 06:21:45 PM »

No worries mate, I'm not sure how you're not having clearance issues, but if it's working, that's good. If you change your mind, I've got several K2 and later hubs here. Cheers, Terry.

timbo750 · « **Reply #254 on:** June 29, 2015, 01:39:20 AM »

Terry, thought I would post a pic of the hub while we are on the topic and get confirmation of the model. let me know what model you think it is.

Terry in Australia · « **Reply #255 on:** June 29, 2015, 04:26:49 AM »

Yeah mate, definitely a K0 front hub, (also used in early K1's, but with the K0 disc, which is different from the later K1 - K6 disc) so too nice to take to with a dremel. Cheers, Terry.

HondaMan · « **Reply #256 on:** June 30, 2015, 04:40:06 PM »

Quote from: Terry in Australia on June 28, 2015, 05:42:46 PM

G'Day Timbo, your KO/K1 hub is also wider than a K2 and later hub, so will give you problems with clearance for the second disc, and of course, the speedo drive issue, so you'd be better off swapping it for a later hub. If you need one, let me know, I'd be happy to swap it for your K0 hub for my K0 project. Cheers, Terry.

...and if Terry doesn't want it, I'm doing a [slow] K0, too...

timbo750 · « **Reply #257 on:** June 30, 2015, 04:59:16 PM »

Ok, OK, I will not touch it. I just checked the other wheels I have and turns out I have 2 complete with later model hubs. I will admit that the reason I used this one was because the hub had been cleaned and polished and the wheel trued.

The better of the 2 other wheels will some spokes changed as I can see some slight surface rust. So it looks like I get to try my hand at respoking the wheel and truing it.

Terry if you are still interested there are two options for the wheel, I can keep the tyre and sell you the hub and rim all clean and trued or if you are interested in the tyre I can keep it on, let me know if you are interested.

timbo750 · « **Reply #258 on:** July 01, 2015, 04:02:30 AM »

Got the other wheel out that I was going to use and removed the old tire. Unfortunately the rim has a few marks on it and some slight surface rust on both the rim and spokes. So tomorrow I will check the rim on my 2nd other rim and hope that its in reasonable condition.

Terry in Australia · « **Reply #259 on:** July 01, 2015, 06:32:29 PM »

Quote from: timbo750 on June 30, 2015, 04:59:16 PM

Ok, OK, I will not touch it. I just checked the other wheels I have and turns out I have 2 complete with later model hubs. I will admit that the reason I used this one was because the hub had been cleaned and polished and the wheel trued.

The better of the 2 other wheels will some spokes changed as I can see some slight surface rust. So it looks like I get to try my hand at respoking the wheel and truing it.

Terry if you are still interested there are two options for the wheel, I can keep the tyre and sell you the hub and rim all clean and trued or if you are interested in the tyre I can keep it on, let me know if you are interested.

Thanks Timbo, definitely interested mate, what tyre is on the rim now? Cheers, Terry.

timbo750 · « **Reply #260 on:** July 01, 2015, 07:10:22 PM »

Terry. It is a Pirelli sport demon. The issue I have now is that I have 2 other complete wheels in the 72-76 age bracket but both have #$%*ty rims and surface rust on the spokes. Do you have a complete wheel that would suit me in good condition and we can swap for the price of the tyre.?

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Terry in Australia · « **Reply #261 on:** July 02, 2015, 04:49:54 AM »

G'Day Tim, thanks for that, sadly I don't, but I can buy you a new rim and spokes and you can keep the tyre if you like? The Pirelli Sport Demon is a brilliant tyre, but I'll be looking for something more traditional for my K0 project. Cheers, Terry.

timbo750 · « **Reply #262 on:** July 02, 2015, 08:51:55 PM »

Terry, over the weekend I am going to make a better assessment of all that I have for this. I may keep the rim I have an change over the hub. Do you have a later model hub on its own in good condition we can swap?

Terry in Australia · « **Reply #263 on:** July 03, 2015, 01:15:29 AM »

Quote from: timbo750 on July 02, 2015, 08:51:55 PM

Terry, over the weekend I am going to make a better assessment of all that I have for this. I may keep the rim I have an change over the hub. Do you have a later model hub on its own in good condition we can swap?

G'Day Timbo, thanks mate, I've got 2 or 3 hubs here, and I think they're all pretty good, but they'll need a clean of course. Cheers, Terry.

timbo750 · « **Reply #264 on:** July 12, 2015, 06:44:23 PM »

I discovered some more damaged threads in the crank case, or not so much the threads damaged but the casing around the threads. I was wondering how I could of missed these, but I guess I wasn't expecting it so I over looked it. so I am patching the case with JB Weld and before I install and parts into the case I am going to connect them together and torque all the bolts, I hope this case is better than just scrap metal.

Terry, thanks for the offer on the hub I have decided to use what I have got and have ordered a new set of spokes. the later model hub I have removed from the rim and started to clean up and starting to look good. Also need to get a dial gauge so I can true the wheel once the spokes and rim are installed to the hub.

mystic_1 · « **Reply #265 on:** July 12, 2015, 08:27:08 PM »

Wow, I don't even...

That's some pretty impressive damage, never seen anything like that before. It's almost like there was something incompressable in the holes before the bolts were run in, and that somehow created enough pressure to explode the side out of the casting from the inside.

I'd be checking pretty closely for cracks etc in those areas, especially since you're adjascent to the transmission shaft bearings.

mystic_1

timbo750 · « **Reply #266 on:** July 12, 2015, 09:57:40 PM »

I have looked for cracks and still keep looking every time I do some work on.

My thoughts on why were possibly incorrect length bolts (too long that is) combined with over torquing, but i will say that they did have a lot of sealant in the lower parts of the thtead recess.

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Terry in Australia · « **Reply #267 on:** July 13, 2015, 04:27:23 AM »

Geez, that's some amazing damage Tim, unreal! Let me know if you want to sell that K0 hub, I'll need one eventually. Cheers, Terry.

timbo750 · « **Reply #268 on:** July 13, 2015, 01:18:10 PM »

Terry, I will hold onto it for you just let me know when you need it.

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timbo750 · « **Reply #269 on:** July 17, 2015, 06:55:05 PM »

Parts arrived this week from several places, as though the planets were aligned. I got the gauge faces from Marcel, spokes from DCC, a new spoke wrench from a local ebay seller and engine seals from yamiya.

All I need now is some time for myself and some warmer weather. It has been so cold here in the evenings that I would not even go out to shed to contemplate what needs doing. My son has his last footy game tomorrow for the season so Sunday mornings will be mine again for a while and hopefully progress will start again.

I have made three attempts at repaying the gauge bezel's and the paint is going on nice and evenly but its so cold the paint is being affected.

Retro Rocket · « **Reply #270 on:** July 17, 2015, 08:07:44 PM »

I've used a fan forced heater and a hair dryer to heat up parts to be sprayed in winter with great success, even painted a whole 900 Boldor engine that way...

Terry in Australia · « **Reply #271 on:** July 17, 2015, 11:58:44 PM »

What paint are you using Timbo? It's way too cold for acrylic laquer (although it was nice out in the patio today with the sun shining for a change) but enamel is usually pretty usable regardless of temps.

I've got an old vertical clothes dryer (remember them? It cost me a slab 20 years ago, and it was probably 20 years old then) and a large fan forced industrial oven in my garage that I pulled out of a skip, so I can warm things up, spray them, then put the painted items somewhere with even warmth all around the part. (or heat in the case of engine enamel that needs to be baked on)

You can try some "Rustoleum" paint from Bunnings too Timbo, I painted the S&W shocks on a cold day but didn't need to fire up the dryers, it went on well and there was no humidity blushing. Cheers, Terry.

timbo750 · « **Reply #272 on:** July 23, 2015, 10:30:00 PM »

Had a small win this week, haven't had too many on this build so I will take what I can get. I was looking through some stuff at the back of a shelf at work and found an old headlight insert still new in the box for an old truck that we longer have and the measurement on the box was 178mm so I was hoping it would fit.

Took it home and had some luck and it was a perfect fit, the globe that came with it most likely is not suitable as its a 100/70 which I think is too much current draw for these machines.

knottedknickers · « **Reply #273 on:** July 24, 2015, 07:15:07 AM »

Quote from: timbo750 on July 23, 2015, 10:30:00 PM

Had a small win this week, haven't had too many on this build so I will take what I can get. I was looking through some stuff at the back of a shelf at work and found an old headlight insert still new in the box for an old truck that we longer have and the measurement on the box was 178mm so I was hoping it would fit.

Took it home and had some luck and it was a perfect fit, the globe that came with it most likely is not suitable as its a 100/70 which I think is too much current draw for these machines.

Nice find! Those kinds of things are important from time to time--you start to get discouraged without them... As for the globe, it looks of the removable type, so you should be able to find a LED (low draw) or an H4 (with lower draw) to fit.

My 'luck' on the headlight front has been a bit different... I was looking for a headlight basket at a wrecker in a different city (mine has a crack or two). I was pawing through a box at the back of the shop and all I came up with was one for a CM400. It looked like it might work, but I didn't have measurements or anything else to go on (by the way, thanks for the 178 mm--that will help!) I bought it, but my headlight doesn't fit (stock headlight too large / basket too small)... So either I need to find a headlight that will fit the CM400 basket or, well, the options are endless; but one thing is for sure--I'll be spending more money!

timbo750 · « **Reply #274 on:** July 24, 2015, 02:48:29 PM »

I had issues with the first basket I had. I did one of those stupid things that later on you say to yourself what the hell were you thinking.

I was attempting my first colour on the fenders and thought the bucket should be the same colour, I put it in the oven to cure and put it out of shape. Ended up getting another repo unit and left it in the black plastic.

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Author Topic: CB 750 Project 1 - Rides Well but a few tweaks needed (Read 116446 times)