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I know this is an old thread but you high mileage guys better check!! I'm at 24k miles & mine are way the F tight!! Can barely get the .1mm in the intakes & the exhausts are about .15mm. Damn I'm surprised she was running at all. Is Hot Cams a decent kit? Says theyll fit my LTZ400 quad too.
 

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Disturbed, very...
2003 SV1000S
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2,018 Posts
The exhausts will be tight after that many miles, especially if they haven't been done before..... and yes, 3 of your inlets are on the edge now.

So, if you are doing them, it will be very helpful to have a micrometer to measure the installed ones, so you know which way to head with the
new shims. Digital verniers may be ok, maybe.
 

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KNEE DRAGGER
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5,238 Posts
Ok after calming down doing it again, here are the #s
Front In .11, .13; Ex .15, .15
Rear In. .10, .10; Ex .13, .12
So intake just barely in spec, exhausts tight so I guess that sounds normal right?
Those measurements are not too bad. Pretty typical in n my experience over time. By the book, you only have 4 valves under spec. With the clearances shown, bike should be running decent overall. In an SV1000 street engine you will start to have noticeable hot running issues when the the intakes are 0.05mm and below and when the exhausts are at 0.13mm and below.

This by no means to keep running an engine with under spec valves, this is just my observations after works on mountains of TL/DL/SV1000 engines.

These bikes use the 9.48mm diameter shims, yes same as your LTZ. The HotCams kits work fine.

Good thing you are checking though!

-ms
 

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Ok thanks guys! I was checking with the cams straight up as I have the magneto cover off so can't really line up the FT, RT marks. But I looked up the pics in the manual & then the readings were a bit better. Shes been running great but glad I'm getting to this stuff finally. Grabbing a better torque wrench, mine doesn't go below 20 ft lbs & yes ordered the hot cams kit.
Magneto cover gasket seems ok, maybe add a little grey rtv?
 

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KNEE DRAGGER
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5,238 Posts
Ok after calming down doing it again, here are the #s
Front In .11, .13; Ex .15, .15
Rear In. .10, .10; Ex .13, .12
So intake just barely in spec, exhausts tight so I guess that sounds normal right?
Oh, and when I get a bike like this, I will often reshim the in spec valves into middle of range. It is so easy on these bikes.

It then makes the next inspection a quick check and done.

-ms
 

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KNEE DRAGGER
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5,238 Posts
Thats what I'm thinking. Should the exhaust be closer to .30 mm? Will it continue to get tighter or will it stay about the same now?
I typically target 0.15-0.18mm on the intakes and 0.25-0.28mm on the exhaust. That way if your target shim is slightly bigger or smaller or your initial measurement was a bit out, you are still in a happy spec range.

As the valve face and valve seat wear with time the clearance will get smaller. But also note as the bucket wears and the shim can wear also that the clearance will get bigger. Just check on the scheduled interval.

Also, note that if the next time you check, if the same valves are all tight again, you might be guttering the valves out and you might need to service the heads.

-ms
 
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