Author Topic: Early Sandcast Found...... (Read 89502 times)

BenelliSEI · « **Reply #675 on:** March 16, 2022, 01:21:14 pm »

Started picking away at electrical. Parts of the main harness are missing, cut up, and brittle. Going to buy a new one. Regulator and rectifier cleaned up well and are going right back. The starter solenoid is missing, but turns out I have a good one. The single fuse holder is gone, was running unfused! Will correct. Boring, plodding jobs ahead......

Weird photo. Looks like rust where the top engine mount meets the frame. Went back to look. All black paint. Strange.

WideAWAKE · « **Reply #676 on:** March 16, 2022, 02:46:32 pm »

What’s the failure rate on those regulators and rectifiers??

Regulator went out on the one I just picked up and fried the harness.

I had a new hardness, swapped it out and stuck in a cheap reg/rev just to see if the bike ran (it does) would like to put it back to stock but not if those two components are really known for failure.

BenelliSEI · « **Reply #677 on:** March 16, 2022, 02:56:02 pm »

Read lots of stories, but in +12 SOHC cb750’s, I’ve never had one fail. Either component.

Also, for this restoration, I am working hard to reuse every original component (when possible). The bike was kept for many years, in a very dry, heated space, so most of it is in decent shape.

BenelliSEI · « **Reply #678 on:** March 16, 2022, 03:23:45 pm »

Tore down a friend’s 3 cylinder, 2 stroke engine today. Needs crank bearings and pistons. Took some shots to remember orientation. I like this one.

Stev-o · « **Reply #679 on:** March 17, 2022, 07:22:41 am »

Hey John...what motor is the 2 stroke? On my 2 Kawasaki triple two strokes, it was real important to install quality crank seals.

BenelliSEI · « **Reply #680 on:** March 17, 2022, 08:02:06 am »

Quote from: Stev-o on March 17, 2022, 07:22:41 am

Hey John...what motor is the 2 stroke? On my 2 Kawasaki triple two strokes, it was real important to install quality crank seals.

Older three cyl. Skidoo. Wyatt found a local shop that specializes in crank work. He’s getting all new bearings, seals, pistons, rings, pins and clips. All seals and parts are direct from Skidoo. Hopefully it will be a drop in.

BenelliSEI · « **Reply #681 on:** March 17, 2022, 04:06:02 pm »

Noticed this bike is fitted with a massive set of nuts! Holding the top of the shock, take a 17mm wrench. Will have to clean them up and keep them on there...... Ordered a new harness today. Back on it next week.

atm cycles · « **Reply #682 on:** March 17, 2022, 06:31:12 pm »

Not trying to be negative in any way. Educational. The regulator is from a much later bike. ‘75

BenelliSEI · « **Reply #683 on:** March 18, 2022, 05:26:15 am »

Quote from: atm cycles on March 17, 2022, 06:31:12 pm

Not trying to be negative in any way. Educational. The regulator is from a much later bike. ‘75

Appreciate that! Two came with the bike, I will take a photo of the other one. How can I tell which is the original? The battery box and various elec. components were in a box..... Thanks.

atm cycles · « **Reply #684 on:** March 18, 2022, 08:40:11 am »

After the 12v the 5 represents 1975. The 12 is December.

BenelliSEI · « **Reply #685 on:** March 18, 2022, 10:24:31 am »

Thanks! Not sure I can read the other one, but will check.

BenelliSEI · « **Reply #686 on:** March 18, 2022, 02:23:51 pm »

Couldn’t read the other one (and the green/white/black sticker is missing. I’ll assume it’s the original, clean it up and move ahead.

Don R · « **Reply #687 on:** March 18, 2022, 02:35:56 pm »

When I got the diecast I didn't even realize it was early, I just wanted it's mags. It had been seriously updated from a parts bike and I continued the tradition for a while. I just wanted one to ride. Lately I've been taking more time replacing newer parts like the V/Reg. with the proper appearing old ones.
Until it loses the Lester mags and the 836 ported and cammed K4 motor, it's still just a hot rod.

BenelliSEI · « **Reply #688 on:** March 19, 2022, 05:14:58 am »

Quote from: Don R on March 18, 2022, 02:35:56 pm

When I got the diecast I didn't even realize it was early, I just wanted it's mags. It had been seriously updated from a parts bike and I continued the tradition for a while. I just wanted one to ride. Lately I've been taking more time replacing newer parts like the V/Reg. with the proper appearing old ones.
Until it loses the Lester mags and the 836 ported and cammed K4 motor, it's still just a hot rod.

Don.... talking yourself into a full resto?

MauiK3 · « **Reply #689 on:** March 19, 2022, 07:58:30 am »

I can see the shoes slowly sliding down the slippery slope:-))

BenelliSEI · « **Reply #690 on:** March 20, 2022, 05:28:35 pm »

Quote from: MauiK3 on March 19, 2022, 07:58:30 am

I can see the shoes slowly sliding down the slippery slope:-))

I agree!

BenelliSEI · « **Reply #691 on:** March 21, 2022, 01:35:20 pm »

Tied in a new harness and spent the afternoon wiring the bike. Blew a couple of fuses (bad flasher unit), but sorted it all out. Not fun, but done!

Realized the bike only has one key. It’s not the early recessed key style, but works the ignition switch and tree lock, so it’s getting refurbished/ reused. Anyone have a “11H” or a blank I can cut to match (see photo)?

BenelliSEI · « **Reply #692 on:** March 21, 2022, 01:38:50 pm »

...... other side.

BenelliSEI · « **Reply #693 on:** March 25, 2022, 07:30:13 am »

It’s the small details that take forever.....

BenelliSEI · « **Reply #694 on:** March 25, 2022, 08:35:32 am »

Making progress...... Painting the oil tank (after a really thorough clean out), sorting out a few more engine mounting bolts, and rear foot pegs. After that, the “roller” is pretty much done! On to the engine.

Terry in Australia · « **Reply #695 on:** March 25, 2022, 04:16:41 pm »

Looking good John. I was interested in Wideawake's concerns about the "failure rate" of OEM regulators. Like you, I've never seen one fail, and I've owned over 20 CB750's in the last 44 years. Interestingly, BMW owners here used to buy used CB750 regulators to improve the electrics on 1970's BMW boxers, which were notoriously horrible.

WideAWAKE · « **Reply #696 on:** March 25, 2022, 05:26:47 pm »

My concern was based on 2 things really… I’ve had many xs650s and a common and encouraged mod is a modern reg/rec cause it’s just a matter of time before the original fails (Happens quite often).

And the second being, the K0 I just picked up came with a fried harness with melted connectors at both the regular and rectifier. I can only assume from the failure of the regulator and the system being over charged and fried.

It’s good to know that it’s not a common occurrence and that getting used components shouldn’t scare me.

BenelliSEI · « **Reply #697 on:** March 25, 2022, 05:46:26 pm »

Quote from: WideAWAKE on March 25, 2022, 05:26:47 pm

My concern was based on 2 things really… I’ve had many xs650s and a common and encouraged mod is a modern reg/rec cause it’s just a matter of time before the original fails (Happens quite often).

And the second being, the K0 I just picked up came with a fried harness with melted connectors at both the regular and rectifier. I can only assume from the failure of the regulator and the system being over charged and fried.

It’s good to know that it’s not a common occurrence and that getting used components shouldn’t scare me.

There is good reason to be watchful. As Terry noted, failures are not common but they do occur. The plastic fuse holders are notorious for getting hot, losing their shape and the resulting loss of clamping pressure on the fuses creates more heat and repeated failures. Like you, I have also noticed lots of overheated terminals and wire. These are usually caused by loose connections (because they are repeatable heated and cooled), loose wires, corrosion and just plain old dirt. Many of the failures are caused by the “repairs” made by previous owners. I can’t remember how many times I’ve discovered lengths of Bell (telephone) wire, speaker wire and #14 extension cord looped into a motorcycle. You’re right to be circumspect and always ere on the side of caution!

I did use a combined unit on my last 750F with excellent results. With this bike I am trying to re use 99% of the original components. However, I did replace the original wiring harness. Half of it was missing, chopped up, and had lousy repairs......

BenelliSEI · « **Reply #698 on:** March 25, 2022, 05:48:24 pm »

Quote from: Terry in Australia on March 25, 2022, 04:16:41 pm

Looking good John. I was interested in Wideawake's concerns about the "failure rate" of OEM regulators. Like you, I've never seen one fail, and I've owned over 20 CB750's in the last 44 years. Interestingly, BMW owners here used to buy used CB750 regulators to improve the electrics on 1970's BMW boxers, which were notoriously horrible.

Terry..... Thanks for the encouragement. Good to see you back on form(?). Hope you are feeling better and I’m seriously jealous about the DUCATI! J.

Terry in Australia · « **Reply #699 on:** March 25, 2022, 06:42:26 pm »

Quote from: BenelliSEI on March 25, 2022, 05:48:24 pm

Quote from: Terry in Australia on March 25, 2022, 04:16:41 pm
Looking good John. I was interested in Wideawake's concerns about the "failure rate" of OEM regulators. Like you, I've never seen one fail, and I've owned over 20 CB750's in the last 44 years. Interestingly, BMW owners here used to buy used CB750 regulators to improve the electrics on 1970's BMW boxers, which were notoriously horrible.

Terry..... Thanks for the encouragement. Good to see you back on form(?). Hope you are feeling better and I’m seriously jealous about the DUCATI! J.

Ha ha, thanks John, the world has gone truly mad when you can sell an old Honda, buy a modern BMW or Ducati, and have cash left over. The Duke is the 916 engined S4, I've wanted one since they were new, so it'll be a keeper.

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Author Topic: Early Sandcast Found...... (Read 89502 times)