Oh Dear - Not Good !!!

[looey]

Ok..... so on the best advice from here, I did the right thing and stripped the top end off the bike today

To my untrained eye everything that could be knackered is . Typical, but I had expected the worst and I'm intending to keep the bike for some time, so I'll take the hit and hopefully have it running properly for some time to come.

First question is, where's the best place to get new valve assemblies, as I don't see anyone listing them other than £100 each from yambits

Next......and a bit of a nasty, is one of the inner barrel bush holes has a hairline crack at the lowest/thinnest point . Had a very close look and it doesn't go any further than the width of the hole and is quite a way from the barrel liner so my question is.......does anyone think it can be repaired ??. Looks like it could be a common weak point caused possibly by the stress at the exhaust stud ?? (which has already been repaired itself).

[markhoopy]

I've got a pair of these in mine:

www.legendmotorcycles.com/index.php?route=product/product&manufacturer_id=13&product_id=137

Cheaper than Yambits and good quality too.

[looey]

Yeah I saw them when I didn't know I needed any but now they appear to be out of stock

[Deleted]

Or here...

www.twostrokeshop.com/two_stroke_shop_YPVS_billet.htm

[nikfubar]

f**k me that's an ugly mess who's been butchering that
Doesn't Norbo sell all the bits you need ?
Maybe you could get the barrel welded, personally I would replace it, not good mate

[midlifecrisisrd]

You could get that welded but is probably worn.

Was it NK or stan stephens that offered boring it out and fittind a thin bush.

I'll have a look if I have a pair of valves.

Steve

[Shytalk]

Apr 23, 2013 20:02:26 GMT 1 midlifecrisisrd said:

You could get that welded but is probably worn.

Was it NK or stan stephens that offered boring it out and fittind a thin bush.

I'll have a look if I have a pair of valves.

Steve

It was Stan

[Norbo]

Apr 23, 2013 19:57:30 GMT 1 @14cheeks said:

Or here...

www.twostrokeshop.com/two_stroke_shop_YPVS_billet.htm

I dont think he has them any more he ran out some tiome back and cant get them made again./

[Dieseldog]

You could try plastic metal on the valve ends. Easy to file down and quite strong, might be worth a try as a short term measure.

[midlifecrisisrd]

Apr 24, 2013 8:24:55 GMT 1 Norbo said:

Apr 23, 2013 19:57:30 GMT 1 @14cheeks said:

Or here...

www.twostrokeshop.com/two_stroke_shop_YPVS_billet.htm

I dont think he has them any more he ran out some tiome back and cant get them made again./

Factory that made them f*cked with the earthquake there. Got them made in US last I heard as that's where my replacements for the sh1t cast ones I got from them came from.

As for the crack, just silicone the bush in along with the retainer as the barrel looks like it has a groove worn in it anyway. Stan charges about £30 plus post to re bush I think.

Steve

[Yogi]

Stan bored my heads 2 months ago and fitted PV bushes?

[phil38]

The ends of the valves where they join were the same on mine. I got them built up with weld and then re-machined to fit the (new) clamp. All but one of the bushes were very worn too, and the journals on the valves were worn & oval. Got the journals turned down until they were round and new inner bushes machined from phospher bronze to fit the journals.

Cost a few quid in favours from a bloke at work, but alot less than new parts. I think you can still get most of it from Yamaha, but new values, bushes & seals adds up to about £300!

That crack looks like your biggest problem though....

[bare]

Might be clever to buy decent used barrels... complete with pv bits??
If thats' what the PV area looks like, It's likely the rest ain't great either.