I've bought something sh*t

I've bought something sh*t

Author
Discussion

Benni

3,509 posts

210 months

Saturday 2nd September 2017
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Try CMS NL, they might have stuff or can order it , I am not sure if this covers your model :

https://www.cmsnl.com/search/index.php?spbmbrand=Y...

Rollin

Original Poster:

6,077 posts

244 months

Wednesday 6th September 2017
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Bike and engine is now in bits.

I have split the crankcase to have a look and clean.

Crankshaft came away from big end bearing OK on transmission side, but the other side won't budge from crankcase.

Any ideas how this can be removed? I only want to remove the crankshaft, not the bearings as they seem good.

The transmission side crank oil seal was knackered so thanks to everyone who gave the diagnosis!

Dakkon

7,826 posts

252 months

Thursday 7th September 2017
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Dog Star said:
Cool thread!

First ever shag AND bike crash was on one of these; went out to meet a really fat bird I'd met on CB radio down a country lane near my house when I was 14. She was 23. She had arrived on her Yamahahaha Passolo and I ended up doing her over the seat. Afterwards I blagged a go on it and promptly stuffed it into a wall. The front mudguard was gone and the basket was all bent. A sort of post-coital moped crash.

I later found out she lived with this massive skinhead football hooligan who was not best pleased that she'd bent the "family" transport (obviously she couldn't explain how it really happened).

This really should be in the council thread.
getmecoat
You sir, are a classy bird smile

Crazy4557

671 posts

193 months

Thursday 7th September 2017
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Rollin said:
Oil seals, gasket set and front pads turned up today. The last ride revealed that the front brake was pretty useless. The rear one worked really well.

I also thought the rear was really bouncy on the current spring/shock absorber. I assume that things have moved on in this regard since the 80's so might look at swapping it. Don't want to....ahem....ruin the handling though. Advice gratefully received. Will obviously keep the original so it can be swapped back when prices for these start rising rofl

The top of the piston is rough and black, so I believe I need to clean that up. There seems to be very little gap between the piston and cylinder, a minute amount of side to side movement.

Still can't release these 3 screws holding the plastic fan on. Off to get some better penetrating/releasing oil.
Look out for a set of Ohlins shocks, they'd stop the bounciness. They probably make a 'one size fits all' that would fit.

Rollin

Original Poster:

6,077 posts

244 months

Friday 15th September 2017
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Bike is now at the point of being put back together again!
Engine has been taken to pieces, cleaned, seals replaced, piston/rings/gaskets ready to replace.

I've hit a problem that I hope someone can help with. There is an oil pump gear which fits over the crank shaft, which then engages with a cog on the oil pump itself. The thing is, there appears to be no way for the gear to lock onto the crankshaft. I can spin the crankshaft whilst holding the oil pump gear still. The clutch assembly fits onto the crankshaft next and then a bolt clamps everything together.
Is friction enough for the crankshaft to turn the oil pump gear?

There is nothing on the crankshaft to engage that slot on the oil pump gear.












WinstonWolf

72,857 posts

238 months

Friday 15th September 2017
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You appear to be missing a Woodruff key, it looks like this. D

Yup, a capital D made of metal...

Rollin

Original Poster:

6,077 posts

244 months

Friday 15th September 2017
quotequote all
I have something that fits into the slot that you can see on the end of the crankshaft but that doesn't interact with the oil pump gear.

The oil pump gear slides much further up the crankshaft and there isn't anywhere on the crankshaft to fit a woodruff key.

cmaguire

3,589 posts

108 months

Friday 15th September 2017
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When the basket/clutch is fitted and the nut tightened then is that nylon/ptfe/whatever thing then still free?
You could see if the oil gear turns and if you can stop it turning with your hand as you rotate the clutch with your other hand.

Rollin

Original Poster:

6,077 posts

244 months

Friday 15th September 2017
quotequote all
The nylon thing is the oil pump gear. I've not fixed the clutch basket on yet, but if the oil pump gear turns at that point, then it's only because everything would be clamped together. I would have thought that there would be a way for the oil pump gear to positively engage with the crankshaft. Especially as there is a slot in oil pump gear.



cmaguire

3,589 posts

108 months

Friday 15th September 2017
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When I said oil pump gear I meant the pump gear itself. If that still turns when you try to hold it then the weirdo thing they call the oil pump gear can't be loose.

I presume that weirdo thing has a spiral rib on it to turn the oil pump gear itself

WinstonWolf

72,857 posts

238 months

Friday 15th September 2017
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Does the bush go on first?

Rollin

Original Poster:

6,077 posts

244 months

Friday 15th September 2017
quotequote all
cmaguire said:
When I said oil pump gear I meant the pump gear itself. If that still turns when you try to hold it then the weirdo thing they call the oil pump gear can't be loose.
At the point of assembly shown in the photos, when I turn the crankshaft, neither the nylon gear or oil pump gear turn.
I don't know if this will be different when the clutch basket and nut is all tightened up.


cmaguire said:
I presume that weirdo thing has a spiral rib on it to turn the oil pump gear itself
Yep.



cmaguire

3,589 posts

108 months

Friday 15th September 2017
quotequote all
That slot may be to allow oil to move or irrelevant. The oil pump usually requires little force to turn, if the weirdo gear is clamped when you tighten the clutch then that should be more than enough.

WinstonWolf

72,857 posts

238 months

Friday 15th September 2017
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That's definitely a Woodruf slot, I fitted hundreds of the darn things as an apprentice smash

cmaguire

3,589 posts

108 months

Friday 15th September 2017
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WinstonWolf said:
That's definitely a Woodruf slot, I fitted hundreds of the darn things as an apprentice smash
And it's for the clutch

Rollin

Original Poster:

6,077 posts

244 months

Friday 15th September 2017
quotequote all
WinstonWolf said:
Does the bush go on first?
No








Rollin

Original Poster:

6,077 posts

244 months

Friday 15th September 2017
quotequote all
WinstonWolf said:
That's definitely a Woodruf slot, I fitted hundreds of the darn things as an apprentice smash
I understand what you are saying, but there is nowhere on the crankshaft for a woodruff key to fit smile

Rollin

Original Poster:

6,077 posts

244 months

Friday 15th September 2017
quotequote all
cmaguire said:
That slot may be to allow oil to move or irrelevant. The oil pump usually requires little force to turn, if the weirdo gear is clamped when you tighten the clutch then that should be more than enough.
I'll just have to assemble everything and see what happens.

cmaguire

3,589 posts

108 months

Friday 15th September 2017
quotequote all
Rollin said:
cmaguire said:
That slot may be to allow oil to move or irrelevant. The oil pump usually requires little force to turn, if the weirdo gear is clamped when you tighten the clutch then that should be more than enough.
I'll just have to assemble everything and see what happens.
I can't see all the diagrams or parts, but the slot in the weirdo gear might be because that is an interference fit bushing in the weirdo gear and the gap is unimportant.

I think the special sealed spacer may be involved in this mystery somewhere, perhaps with a dose of centrifugal force and oil action when the engine is running (if the weirdo gear doesn't go tight when the clutch nut is fixed)

Rollin

Original Poster:

6,077 posts

244 months

Friday 15th September 2017
quotequote all
cmaguire said:
Rollin said:
cmaguire said:
That slot may be to allow oil to move or irrelevant. The oil pump usually requires little force to turn, if the weirdo gear is clamped when you tighten the clutch then that should be more than enough.
I'll just have to assemble everything and see what happens.
I can't see all the diagrams or parts, but the slot in the weirdo gear might be because that is an interference fit bushing in the weirdo gear and the gap is unimportant.

I think the special sealed spacer may be involved in this mystery somewhere, perhaps with a dose of centrifugal force and oil action when the engine is running (if the weirdo gear doesn't go tight when the clutch nut is fixed)
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