400sm with valve/engine troubles?

so I was checking and adjusting my valves on my 2006 DR-Z 400sm last night, and I'm having quite a bit of trouble getting one of the valves into correct specs.

if anyone could point me in the right direction, I'd be thankful

long boring story short- I'm assuming I need new valves/springs/etc, or even a new engine.

the left side intake valve will not get into specs

it had a 2.0mm shim to start, and could not get a 0.05mm feeler guage inside

switched to a 1.75 shim- still no room for a 0.05mm feeler guage

switched to a 1.50... nope. 1.25...nada...

down to a 1.20mm shim, and I still am not able to get a 0.05 feel guage between the bucket and cam.

I then started peeking around more and noticed a few more things...

I could push down the valves by hand at differnt spring pressures.

meaning, standing on the right side, looking at the cam sprockets,strong- far exhaust, close intake, close exhaust, far intake-weakest

as for the icing on the cake, I stuck my finger in a pooled spot of oil in the cylinder head, and came up with some nice metal shavings.

I'm a bit of a paranoid person, so I'm assuming the engine is coming appart or has is internally damaged.

specs on the bike- Athena 440 Big Bore Kit

Hot Cams Stage 2 Intake and Exhaust cams

Hot Cams Valve Springs and Shims

Kibble White Titanium Valves

FCR39 Flat Slide Carb with Zipty pilot needle

Full Scorpion Exhaust

K&N filter

3x3 air box mod

was this bike running? sounds like it has a broken valve to me.

Carnage for sure. Sounds like you are laeving out a lot of vital information here...like the water in the oil and the big boom before it quit running?

was this bike running? sounds like it has a broken valve to me.

the bike was running a few weeks ago, I just now was able to get time to break free to get into the engine.

everything looked decent... other than the shavings. looks like it's time to pull the head next.

Carnage for sure. Sounds like you are laeving out a lot of vital information here...like the water in the oil and the big boom before it quit running?

no water/oil mix that I saw, and as for when it was running last- it was running well, but had long crank times before it would start up.

no missfires/rough running were felt when it last ran.

thanks for the points in the right direction guys!

I'll be able to get more pictures later tonight

Was the bike running before you decided to check the valves? Your still withholding vital information for this issue.

Was the bike running before you decided to check the valves? Your still withholding vital information for this issue.

sorry, work has me running around in circles today.

it was running fine a few weeks ago, then I was riding home and shut the bike off like normal for the night.

the next morning, it wouldn't start. it didn't sound like it was firing up at all.

the same thing happened a few months ago, and I took it to a friend of a friend's shop who did a valve shim adjustment and it ran great after that.... until this stuff happened.

The valves you have specified (Kibble White) are known to be junk. If you didn't drop the valve...my best guess is that it sucked the valve into the port because it ate the valve seat.

Take some pictures and post them up. Then we can advise you better.

ok, got some pics for inspection

here we have some nice shavings in the oil...





after starting to pull the head off, I find this nice piece of rubber in the lobe side of the exhaust valve bucket




and here we have a nice piston, with a side of carbon...



and now the coup de grace

when seen at the right angle, the intake valve I was having problems with, is the one thats stuck up even further than the other one.




thanks again for any help guys. I'm starting to go nuts from withdrawls.


the ex cam timing was not correct on top of the valve issue. the rubber is what is left of a valve guide seal.

Make sure you check your cylinder walls for scoreing.

some more pics I took today. pulled all the valves out and found the inner valve spring for each valve shattered.

most of the spring retainers were grinded down from the valves, so I am assuming that's where most of the metal shavings are coming from










kibblewhite strikes again.

you actually got pretty lucky.

kibblewhite strikes again.

you actually got pretty lucky.

Been there done that, still have the parts on the shelf. (head,valves, springs, retainers piston, cyl)

and with R/D ti valve springs (head, valves, springs, retainers, bucket)

and with OE springs and valves (Head, valves, springs, retainers)

Now have RHC full kit installed by SSW :smirk:

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