Author Topic: CB 500 Four (1972?) Full Restoration (Read 144457 times)

bryanj · « **Reply #850 on:** April 13, 2016, 11:17:41 PM »

Tried that, it dont work. You need a set of hole punches and some appropriate felt

MickB · « **Reply #851 on:** April 17, 2016, 08:21:29 PM »

I've read oil used in diesels (She'll Rotella)is the oil to use in these old engines.

Any opinions?

bryanj · « **Reply #852 on:** April 17, 2016, 11:27:34 PM »

Yup, its Ideal, dont forget its changed every 1500 miles. Here in UK we have Tesco and their own brand diesel oil is exactly the spec for the old Hondas, might be worth you checking Walmart or similar looking at the SAE ratings and you DO NOT want synthetic or Semi Synthetic UNLESS its a Bike specific one---and they cost too much anyway

MickB · « **Reply #853 on:** April 18, 2016, 01:25:36 AM »

Thanks BJ, we don't have Walmart in Oz, but I take your point.
We only have unleaded here, do I need to put some additive to help valves etc?

bryanj · « **Reply #854 on:** April 18, 2016, 11:32:37 PM »

Nope, they were built to run unleaded in the first place but get the one with least ethanol mix

RAFster122s · « **Reply #855 on:** April 19, 2016, 12:10:56 AM »

ZDDP added to your oil is advisable, HondaMan documented some of the additives and lubes and most all auto oils simply don't have enough protection for our motors and they have not for over 5 years. Some of the motorcycle oils do, some don't...so there isn't a single brand commonly available here and abroad that is universal.

Valves and other parts need the ZDDP, but too much is bad as not enough.

David

MoMo · « **Reply #856 on:** April 19, 2016, 03:48:35 AM »

Rislone if you have it down under...Larry

MickB · « **Reply #857 on:** April 21, 2016, 12:05:51 AM »

Thanks boys re the oils and top end lube.

Carbs are back on and filled with petrol and not leaking!

Pressed the start button and it's turning over fine but not firing! But it did backfire, so I need to work a bit more on the timing I think, stating the obvious.

Timing isn't my strong suit either.

Front brake switch (was brand new) doesn't seem to want to work, need to chase the lines through and find out what's the problem.

MickB · « **Reply #858 on:** April 21, 2016, 03:09:19 AM »

Thanks Cal, I was thinking the exact same thing, I just watched Dino's installing the points plate and coils. I'll watch again and follow the process, so close now.
Still no tank or side covers on yet, they'll be the last parts that go on the bike. I'm too scared about scratching them.

I'm expecting big things tomorrow.

MickB · « **Reply #859 on:** April 21, 2016, 07:09:03 PM »

I presume the firing line is just to the left of the F mark and the next line to the left is TDC?

bwaller · « **Reply #860 on:** April 21, 2016, 07:19:01 PM »

That is correct. If it was a strong backfire Cal could be right. Sorry just read the last three posts, but did you have the points cam off the advance and re-install 180d out?

MickB · « **Reply #861 on:** April 21, 2016, 08:10:06 PM »

BW and Cal the plug wires were incorrect. I had the left coil to 1 & 2 and the right coil to 3 & 4 - all fixed left to 1 & 4, right to 2 & 3.

BW yes I did clean the advance mechanism, maybe I did, check the photo at the end of this post.

As I set the points on the F line, they're not opening just past the F line?

BW is the advance unit set 180° out?

There is a dot just down from the 2.3 mark, should the line on the cam line up with the dot?

MickB · « **Reply #862 on:** April 21, 2016, 09:07:44 PM »

BW you're right it was 180° out, now fixed.

MickB · « **Reply #863 on:** April 21, 2016, 10:09:09 PM »

I placed the leads to the plugs incorrectly, I now have coils with the plug leads too short, it's trying to start on 3 cylinders - doh!

MickB · « **Reply #864 on:** April 21, 2016, 10:38:56 PM »

We have lift off - rigged up a temp solution to the plug lead problem a wire to the plug.

MickB · « **Reply #865 on:** April 22, 2016, 01:43:11 AM »

Seeing I have to replace the left coil (1 & 4 cylinders), does anyone have a recommendation for a coil?

MickB · « **Reply #866 on:** April 22, 2016, 01:55:15 AM »

Also oil is pouring out from the alternator case which I placed the little oil plug in backwards, the boss was pointed inwards.

I had this around the other way and it was loose, I presume the alternator case keeps the plug in place by pushing against the little boss?

Bootsey · « **Reply #867 on:** April 22, 2016, 02:38:07 AM »

Awesome work on getting it running Mick, you must be stoked!
Is the o-ring on that plug the right outer diameter?

DH · « **Reply #868 on:** April 22, 2016, 04:54:20 AM »

That thing sounds pretty good considering it came to you as a pile of parts. Congratulations are in order. WELL DONE SIR! You're nearly there

MickB · « **Reply #869 on:** April 22, 2016, 05:49:46 AM »

Hey Bootsey, I think I put the plug in back to front. I looks to me on the schematic it should have the pointy (boss) bit facing outwards and the cover holds the plug in place?

Anyone agree with my diagnosis?

MickB · « **Reply #870 on:** April 22, 2016, 05:53:52 AM »

Cal when I went to start it I didn't realise the #1 plug lead wasn't reaching the plug, thus trying to start on 3 cylinders. When I realised I put a piece of wire between the lead and the plug it started immediately.

I have cut the leads too short only on the left coil, so a new coil is needed.

Any suggestions on which coils, doesn't have to be the most expensive.

RAFster122s · « **Reply #871 on:** April 22, 2016, 08:35:19 AM »

I don't remember if it is PartsNMore or cb750supply that carries a nice aftermarket coils that HondaMan recommended...around $100 for a pair if I recall correctly.

MickB · « **Reply #872 on:** April 23, 2016, 04:20:49 PM »

Cal are these the coils you say I should use? 5 Ohm

RAFster122s · « **Reply #873 on:** April 23, 2016, 07:09:45 PM »

The ones I mentioned were CB750Supply
http://www.cb750supply.com/search/?q=CB-70616
should be at top of page's listing... $36 each and shipping.

David

MickB · « **Reply #874 on:** April 24, 2016, 07:17:20 PM »

Sprung an oil leak from the oil plug behind the alternator (was in backwards), however does it have something to stop it popping out into the alternator cover.

The alternator cover does have a cut out where the oil plug seats.

Is there some sort of retainer/ spacer? It looks like it can pop out a little way. It looks like it should, but there's nothing showing in the schematic.

News:

Author Topic: CB 500 Four (1972?) Full Restoration (Read 144457 times)

DH