78 Honda NC50 engine - is something missing

Jack Rutherford /

Bought this engine should something be where arrow doth pointieth?

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Edited 1 time(s). Last edit at 08/09/18 09:57PM by churioz.

Re: 78 Honda NC50 engine - is something missing

Yo JR,

The starter arm and it's spring are missing. Be careful installing because it can be installed inverted. Looking carefully at shape and wear marks will make it evident on which way is correct.

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Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

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Think there's a connection between this bent starter lever and missing starter arm?

Re: 78 Honda NC50 engine - is something missing

Not at all.....I think your last pic is related to a crash.

Are you using this for parts or trying to get it running???

If the latter, do me and yourself a favor.

Look to see if the clock spring is broken in the starter drive. That may be why someone took it apart. Cause most peeps have trouble getting these back together.

Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

get it running. spring appears fine.

Re: 78 Honda NC50 engine - is something missing

Jack did you take this apart or has someone else taken it apart before you?

Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

Bought it cheap. I took it apart. Kick start lever would wind and not catch so I had to see what was up. I just changed left crank seal on my other one so I have some experience. Waiting on new starter arm to arrive.

Re: 78 Honda NC50 engine - is something missing

So was the stater arm missing when you got it?? My point was I would be wondering why someone else took it apart, but you said catch wasn't working.

Anytime something has been taken apart I have to ask myself who and why.

Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

starter arm was missing when I got it. I was wondering the same thing.

Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

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Ok i think I got it. Let me know if otherwise.

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I assume this washer should be flat?

Re: 78 Honda NC50 engine - is something missing

> Jack Rutherford Wrote:

> -------------------------------------------------------

> >

> Ok i think I got it. Let me know if otherwise.

>

> I assume this washer should be flat?

That might be a wave washer , meant for a bit of tension , somewhere .

Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

washerlocation.png

pretty sure it goes behind this sprocket

Re: 78 Honda NC50 engine - is something missing

JACK!! DO NOT DAMAGE OR LOSE THAT WAVE WASHER!!

There is no reference in the service manual only the parts diagram and here on M.A.

Can't believe you already forgot.....

the purpose and correct location of that wave washer

Re: 78 Honda NC50 engine - is something missing

> Jack Rutherford Wrote:

> -------------------------------------------------------

> >

> Ok i think I got it. Let me know if otherwise.

>

> I assume this washer should be flat?

Do NOT flatten it's a wave washer for a reason. See my link above^.

Look at my pic and see timing mark lined up with starter arm. This again is for a reason. It's set this way to apply a little preload to moving parts so they stay in place during installation AND to bring the start pedal firmly back up to its stop. Notice in my pics the chain is taunt on both sides.Edited 2 time(s). Last edit at 08/16/18 12:39AM by themotorhead.

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Re: 78 Honda NC50 engine - is something missing

Better picture of timing mark

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Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

Ok so that's the timing mark the manual was talking about. Thanks!

Kind of tiny.

Ok, the wave washer will go back where found. And now I got to tear apart my other engine because I thought that washer was bad. I'm pretty sure, I've still got it though. And I was noticing some weird noises from somewhere. Thanks for the help. You guys rock!

Re: 78 Honda NC50 engine - is something missing

More pics of washer(s) placement

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Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

ok I had to delay bedtime and go check. Wave washers located and one installed on current engine (I've got to dig into my other engine and replace it there). Starter arm aligned with timing mark and, as your pics confirmed, I feared I was missing those three washers on the other side of the sprocket. Sheet!

Re: 78 Honda NC50 engine - is something missing

Happy to help JR.

Take pics and report back

Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

Found the driven sprocket, two washers and needle bearings for $22 on eBay, nice!

Re: 78 Honda NC50 engine - is something missing

Jack don't forget the flat washer #17 that goes between case and wave washer behind gear. The flat washer reduces wear on the wave washer.

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Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

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starter arm lined up with punch mark

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flat washer, wave washer installed and then thick washer, bearings, thin washer on other side.

put back together and working fine. Now to mount her and see if she'll start.

Thanks for the help Pacer RacerEdited 1 time(s). Last edit at 08/21/18 12:29AM by churioz.

Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

mounted it yesterday and got it running after correcting no spark situation. blowing white smoke. hopefully it was just oil in the engine. maybe needs new seals.

Re: 78 Honda NC50 engine - is something missing

> Jack Rutherford Wrote:

> -------------------------------------------------------

> mounted it yesterday and got it running after correcting no spark

> situation. blowing white smoke. hopefully it was just oil in the

> engine. maybe needs new seals.

Ride it a bit and see if it clears up.

Glad to help as other have helped me.

Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

I need to bookmark this thread. Replaced seals on another Express engine. This time I tried laying the engine on its side to do so (as the manual indicates). Of course, parts dropped out of the left side cover. I've got a flat washer that I'm unsure of where it goes. I know one goes behind the wave washer so I'll check that but does a flat washer go here:

expresslcover.jpg

Re: 78 Honda NC50 engine - is something missing

Vladimir Grachev /

Re: 78 Honda NC50 engine - is something missing

> Jack Rutherford Wrote:

> -------------------------------------------------------

> I need to bookmark this thread. Replaced seals on another Express

> engine. This time I tried laying the engine on its side to do so (as

> the manual indicates). Of course, parts dropped out of the left side

> cover. I've got a flat washer that I'm unsure of where it goes. I know

> one goes behind the wave washer so I'll check that but does a flat

> washer go here:

> >

No JR,

No washer there. That shaft does not spin at any significant speed. Its only used to start motor.

Heres a pic of mine before putting together:

Post a pic of the washer in question please.

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Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

Aw hell! Well there's a flat washer behind the wave washer already. Where the hell did this come from? It's a flat washer (black) just like the one behind the wave washer. Someone has been in here before me so who knows what they added. It fits rather well where I indicated. I put it back together but didn't add oil yet.

Re: 78 Honda NC50 engine - is something missing

That washer that goes on the front side of that needle bearing..(18 in the diagram above) is that just some regular washer or something special?

Re: 78 Honda NC50 engine - is something missing

Jack Rutherford /

It's just a washer. A specific size washer would be th special part. The washer behind the needle bearing is thicker.

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