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Discussion Starter #1
Well as you know I purchased a second hand 990R at 28,500kms. The history surrounding the 24k service was a bit dubious, and the fact the bike is at 30k i'm doing the full yada service including all the things that should have been done in the 24k.

So.. so prompted by this issue, i had to get the tank and airpbox off to check plugs and coils etc. What a perfect time to check valve clearances and timing chain.

What do ya know: Exhaust valves are all just out of spec. 0,20 ÷ 0,29 mm is the spec and mine are just under 20. But whats more of an issue is that the left exhaust valve of cylinder 2 is 0,12 ÷ 0,15 (inlet valves are fine BTW).

We did not take off the radiator to check these, and its somewhat hard to get the right angle for cylinder 2, so im going todo that this evening and re-check - But just goes to show that these need to be checked.

PS: I'll take some pics as when i rebuild and update this thread as there are a number little things that are different in the removal process than gen 1 bikes.

Question: Does anyone know of any issues with Y10+ in this regard? E.g. Valve stretch, worn valve seat, Camshaft wear, Broken valves etc?
 

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Discussion Starter #2 (Edited)
Right, so i need to shim all the exhaust valves. As above, we are between 0.18-0.20 on all but one which is 0.12-0.15.. I will need the following - is this correct? (measured clearance - desired clearance + existing shim size)

so can anyone help me with where to look to get these? (sorry have no idea where to start or what to get).

http://www.hotcamsinc.com/ are mentioned quite a few times on the forum?

Thanks!

Simon
 

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Might pay to check out local places. Quite a few offer what you need, as opposed to buying a whole range in a pack and only needing a few.
 

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Discussion Starter #4
Hey all - Im wondering if have i got my math and calculations correct here?

(measured clearance - desired clearance) + existing shim size = new shim size?

(0.18 - 0.25) + 1.6 = 1.53 (i need 7 of these)
(0.14 - 0.25) + 1.6 = 1.49 (i need 1 of these)

According to the parts manual the standard shim thickness is 1.6 i believe - am i reading the manual right?

EDIT: Thanks for the help! :)
 

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Disclaimer - I am no expert at this. However, I did just adjust my valves (mostly the exhaust valves, also) and this is my understanding (I have Gen 1 910R).

There is no "standard" shim thickness, though I believe 1.6 is the required minimum on the MV (which is probably why that is the smallest they offer). When I did mine which had not been touched since the bike was new, the shims varied from 2.00 to 2.10. So which size shim you replace them with will depend on their initial size.

For example, mine were off about the same as yours, so when the installed shim was 2.00, I replaced it with a 1.95 to bring it within spec (.05 more clearance - say from initial measurement of 0.18 to 0.23 with the new .05 thinner shim). You could almost go with a 0.10 thinner shim and still be in spec (0.28), but I don't know enough about these things to know if that is the way to go.

I hope that helps.
 

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Also, check and recheck your numbers. I kept trying to add when I should have subtracted or vice versa. The table provided in the first gen manual helped greatly to keep track of everything.

And another thing, the writing on the shims that came with the bike was almost impossible to read, so I had to rely on a caliper to measure them.
 

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Sorry, I keep thinking of other things. Shims come in 0.05 increments, so in your calculations, you show 0.07 to get to you're desired clearance, but your going to have to go with a 0.05 smaller shim or a 0.10 smaller shim as I said in my example above.
 

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Hi greminn, nice part of the world you're in, I used to frequent there every summer when I basically temporarily move to Mahia for the 3 months uni holiday.

Now, I don't know how useful this is (and particularly for a high tech Italian engine), but back when....valve clearance used to go out enough that keeping a log was useful, I used to have a sheet recording values as measured, and values as adjusted and compare with each new valve check and adjustments. Yamahas used to get tighter, whilst Suzukis got looser.
 

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Right, so i need to shim all the exhaust valves. As above, we are between 0.18-0.20 on all but one which is 0.12-0.15.. I will need the following - is this correct? (measured clearance - desired clearance + existing shim size)

so can anyone help me with where to look to get these? (sorry have no idea where to start or what to get).

http://www.hotcamsinc.com/ are mentioned quite a few times on the forum?

Thanks!

Simon
I have a shim kit that I can drop around if you want.....:smoking:
 

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You may be finished by now, but when I did mine, after calculating the required shim sizes I was able to shift around my existing shims to meet specs and only needed to buy 3-4 more. I ended up getting them from an old bike shop as the size of the shims is pretty common with other brands of bikes. Off the top of my head, I believe the '08 Yamaha R6 has the same size shims. Probably cheaper than going through MV or buying a complete kit of them.
 

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Discussion Starter #11
Thanks for all the knowledge guys! Still in process..

Jerry, I'll take you up on that if that's ok?
 

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Discussion Starter #12
Well - we ended up going all the clearances as the inlet were right on the edge of spec. Got the local MV dealer todo the shims in the end, so they took care of removing the cams etc. Its back to me today to get the head cover back on and all the rest of it together - all the nice clean bits :)
 

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Discussion Starter #13
A quick question... I read on the hotcams site that when putting new shims in you should try not to idle the bike nor rev it much.. see attached. Is this something i need todo? I'm guessing yes, but just wanted to get confirmation of this. (thanks)
 

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Discussion Starter #14
Got the bike back from shop, and after a day of slowly putting things back together... And sometimes getting things in the wrong order (I know how to take the radiator on and off real well now)... Success! Started first pop. Beer time now.

Tomorrow is round the block test, then check things and put the rest of the fairing on... Then a wee ride for a coffee somewhere :) as a trial.


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Discussion Starter #16
No never ever did what hotcams recommend ,never had any issues ,put them in and go,
Yep. Ended up doing just that. A bit of oil over the top of the valves before putting the cover back on.
 

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Discussion Starter #17
And I nice ride in the NZ winter to celibate getting all sorted :)






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