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When it comes to springs the more important measurement is spring pressure at installed height. The manual gives this number but you need a spring/pressure tester to check them. Any good engine machine shop would have that.

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Thanks Robin, I think the fact that no two are the same length and also that new they are only £3.00 each it just isnt worth trying to skimp and re-use them.

heli_madken wrote:Thanks Robin, I think the fact that no two are the same length and also that new they are only £3.00 each it just isnt worth trying to skimp and re-use them.

I agree. Just change them out while you're in there...

Track T 2411 wrote: I agree. Just change them out while you're in there...

Yep ordered and on the way thanks

PS WHY DIDNT ANYONE TELL ME I HAD TYPO'D 'AUTUMN'

My rear engine cover has had a very hard life, it must have been out in the weather for a long time to be so pitted and corroded. PO made no real attempt to get it smooth, that said I guess I have to give him credit for bringing back to life what must have been an engine in a bad way.

I cant locate a replacement in the UK at the moment and shipping from US will be enormous. I am considering filling but obviously heat is an issue, anyone tried filling engine cases before to get them smooth, if so what did you use?

Two part epoxy, spread it quickly before it sets.
That will fill the low spots then sand and prime.

spray it with some kind of texture paint (hammered finish, etc...) and call it good.

Thanks for your help,

In the end I used JB Weld 8297 High Heat filler - https://www.amazon.co.uk/dp/B007PP26RI? ... E_DDE_dt_1 not particularly easy to apply but it sands well and I am pretty confident that it isnt going to peel in any way.

So I filled what I could and sprayed some colour, I am happy with the transformation, not perfect but an improvement -
Picture doesnt show it well but the new thermostat opens twice as much as the old, I am sure this was my problem with overheating -

I have moved on to tidying up the main casings now, just doing some prep work.

I cant say that I have noticed before but three of the four left hand engine mounts have been welded back in place. I am guessing from the state the casings are in that the mounting bolts had rusted into place and a little too much force used to free them, probably no choice.

I think I would have been tempted to replace the casings but then the original engine number would have been lost.

Do you think this is anything to worry about? the engine is pretty much sitting on top of the lower mounting, I dont think the upper front does a great deal and the lower rear mount is in good shape which is the one I think I would worry about.

I think I will just do my best to tidy them up a little -
Started to do some tidying up on the top rear mount -
Front cover and bits painted -

There are several bikes here that have no front top engine mounts for one reason or another. It looks to me like the repairs are pretty sound, so IMhO you shouldn't need to worry about it... nice progress, BTW!

Yea that rear case came out great!! I would not worry about those mounts. I think the two lower on the frame rails do most of the heavy work for the engine mounts. Do a thorough inspection of the removable frame section and the center stand frame area for corrosion and weakness.

This thread moved at O.P.'s request.

Thanks Robin.

I have been busy polishing and painting, almost ready to start putting the engine back together.

Switched my attention to the radiator which is a little untidy, as I started to strip it apart I noticed the fan was loose, turns out the shaft threads are stripped, PO had used a Nyloc nut and tried too hard I think to seat it, I am lucky as it was hanging on by just a thread -
So where do I go from here, a few alternatives any help would be appreciated -

Buy second hand, I would be trusting to luck about condition (at least this motor seems to run strongly)
Buy new, looks like this motor was used on a 1981 Accord, new is $148 for genuine Honda, has anyone else used this?
Drill and use a small 'R' clip, the fan is keyed it just needs to be held in place but I would be a bit worried about weakening the shaft
Cut a new thread smaller and fit appropriate nut, shaft is 5mm I could go to an imperial thread say 3/16 which I think is slightly smaller

Any other options, is there an alternative motor, I am sure I saw a thread somewhere?

My bike isn't completely stock so I thought I would do something a little different on the rocker and belt covers, I did the same in 1980 on my original bike and liked the look -
The badges were in a bad way so I had to paint them and did my best to get them a little better, they seem to be made of very soft alloy, does anyone know of a source for new parts?

You can flatten the shaft end, center drill and tap for a small screw/washer combination. Loctite the screw, of course.

Here is a cross reference for the fan motor and other vehicles it was used on.
An eye watering price though.