Under-bucket shims - Yamaha

[A100man]

Hi All

FZ750 weeping rocker cover gasket => Change it => Better check valves while I got all the rad etc.. off.

Bugger 80% are tight or under the limit..
..Cams out

Now need a good handful of shims. Are these universal across different nikes 7.48mm size crops up on ebay..

..or does anyone operate a swaps pool?

Cheers
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Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[Nobby the Bastard]

I have some here but they are probably similar size to the ones you've got. Your best bet is fz proboards on facebook.

The admin used to run one
Just measured one. 7mm exactly. Wemoto used to supply them so you can try there.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[A100man]

Hi Nobby

yes I'm on ProBoards, (but not FB cos I'm old and curmudgeonly)

Also found this site which appears to sell at a bargain price..

https://www.racing-planet.co.uk/
____________________
Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[Nobby the Bastard]

You could try fowlers as well.i 2would say mine are available to you but like I said, mine seem to be the originals and would probably be too thick.

Let me know which ones you need just in case, though.

The only warning I'd give you is to watch for the chain to jump after you reassemble. The tensioner doesnt always kick in as soon as it needs to and the slack can cause the chain to jump.

Not really an issue but turn it over by hand before putting the valve cover back on just in case.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Nobby the Bastard]

Graham from proboards says he couldnt find his last week when someone asked so you've probably already asked him on proboards.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[jeffyjeff]

[A100man]

[Copycat73]

when i did my R1 .. got the shims from here https://www.wemoto.com/

more than adequate ...
____________________
Whatever I post I have no citation and no intention of providing one..
caveat emptor

[yen_powell]

Some bike places will swap your shim for one of the size you want with a small charge.
____________________
Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits

[Pigeon]

I tend to go for Hot Cams shims if possible.

Have also used dirtbikestore and ordered individual shims over the years.

Always measure with a micrometer so am sure what goes in is ok.

Checked 15k miles later and things still in spec.

[Pigeon]

[Fizzer Thou]

[Nobby the Bastard]

I'm pretty sure exup engines are a different beast to the fz engine. Fz has shims 7 mm diameter and I seem to remember that fzr ones are much bigger .

Fz shim below.

https://i.imgur.com/voT6aVL.jpg
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Fizzer Thou]

https://www.ebay.co.uk/itm/7-48mm-Hot-Cams-Shim-Kit-1-20-3-50-In-0-05mm-Increments-3-Of-Each-Size-HCSHIM01/303240486911?hash=item469a8a9fff:g:h7YAAOSwuaFZ3lYo

While being larger they are not substantially larger at 7.48mm.

The kit that Pigeon used as an example is almost exactly what I have got that I use on the R1 and Exup.

I looked on the Wemoto and Yambits websites and surprisingly there is no mention of clearance adjusting shims.But cmsnl.com show them

https://www.cmsnl.com/yamaha-fz750-1986-1tv-england-261tv-310e2_model37291/padadjusting-120_1aa1216800/#.XsaVA9t7nIU

...as do Fowlers of Bristol,to some extent....

https://www.fowlersparts.co.uk/parts/4043395/fz750-1tv-1986-999-b/valves-and-springs?noredir=1

...but they are expensive for those that are available
____________________
Just talk bikes.What else is there?

Always have a 'Plan B'

[A100man]

OK so finally got this job buttoned up having been donated some shims by Nobby and the rest exchanged at Flitwick..
However post reassembly check shows they are still tight in places, in fact one or too are tighter!

I'm 99.9% sure I swapped correctly then I recalled I had to pry a little to get the intake cam out it was kind of stuck on the locating web.

Did I bend the intake cam?

Couldn't really notice any tight spots turning by hand but I wasn't really paying attention to that.
I ran it around on the starter a few times to see if it need to bed in but it made little difference - the intakes in questions should have been back up to six thou (0.15mm) on #4 but are still around three thou even after a shim swap.

Think I might plastigauge the top caps on the intake cam.

Thoughts?
____________________
Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[Nobby the Bastard]

It's not unknown for people to grind shims down. Did you check the shims you took out were actually the size they purported to be?

I only ask because the ones in yours were suspiciously big. Most of the ones that came out of my fz at about 50k miles were too thin to be of use.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[A100man]

Hi Nobby

Engine purportedly only has 25K on it, but in reality anyone's guess.

That thought crossed my mind too - tricky buggers to measure with what I have..

Thinks .. stick a rod in first then zero against that length (dim-wit)

Might still plastique anyway for the cost. another new experience too.
All the fun of the fair eh?
____________________
Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[Nobby the Bastard]

As the ones in there seem to result in tight valves despite being smaller sized than the ones that came out I reckon you can be reasonably confident in measuring the gap using them.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[A100man]

[Nobby the Bastard]

From what graham told.me when he taught me how to do it, cams are more.likely to snap than bend.


You did make sure that you numbered all the buckets when you took them out?
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[A100man]

[A100man]

Ok, new theory. Went through the ball-ache of taking the inlet cam out again to check the under-reading valves. The offending shims were the values I thought so no drama there. Then, on replacing, I noticed it wouldn't seat properly on the valve stem, I think because i'd dabbed them with assembly lube and there was some trapped air .. meaning that the inverted cup shim on top of the valve stem made a kind on pneumatic damper.

Could it be that when the valve is closed (point of clearance measure) the shim & bucket are being pushed up by the 'damper'. Pre-work the clearance was 6 thou on the dodgy ones and after reassembly with the sticky lube I could barely pass a 2 thou feeler through two of them..
____________________
Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[Nobby the Bastard]

You shouldnt need any lube there. There wont be any movement between the valve stem and the shim to need lube to prevent wear.


Remove the lube and refit.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[A100man]

[Nobby the Bastard]

Trapped air or grease, yes. Quite possible.

If you do want to add grease then between the shim and cap would be preferable
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050