dropped/ sucked in valve

I just also came across the thread below .is this what happened to my mille?
my rear piston is hitting the spark plugs while smashing both of them in. one of them about 4 to 5 mm and the other about 2 to 3 mm... the motor used to start with low oil pressure which was caused from a previous clutch problem when the gasket getting ripped in the motor with shaved aluminum pieces from the washer after a spring popped out at high speed. anyway
so my question to the Aprilia guru is, does this sound like a have a dropped valve on the rear cylinder? my motor is currently seized wouldn't start. do I have to drop/remove the motor from the frame completely to do that? or to check to see if my shaft/bearings are shot? thanks
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You dropped a valve
Sorry,

I just came across this thread.

Novice and Intermediate riders tend to over rev Milles on downshifts. I've been directly behind TWO people that did this and they both crashed when the valves stick in the cylinder and seized the engines.

After an intake valve breaks the broken pieces go back up into the air box and usually get sucked into the "good" cylinder and ruin it too.

This is caused by one thing only.... over reving the engine on downshifts. A slipper clutch will only protect your valve train for so long. Brakes are made to slow bikes down, not compression braking via slipper clutches. This is teh only draw back of a slipper clutch. It lets you get away with stuff that with out it would have put you on your head on any other bike.

Sorry to be so blunt but I've been around Mille's longer than most and this is almost for certain what happened. You're looking at big $$$ to fix this thing. Couple of grand maybe more. For sure Pistons, Valves, Heads, maybe both cylinders. Ouch...

Good news is that Blackmans has a kick *** stage 3 kit that is about the same $$$ as OEM stuff and now you can have your 130+ HP Mille..."

I found a link to check the valve clearance on Falco( I guess it's the same rotax for reference) http://www.geocities.com/sl_mille/valves.html

so how can I tell whether I dropped a valve or not?

Allen can I see your bike for a sec? lol I will check it and see I had the money a few weeks ago to buy the motor it was just not the 2001/2002 Mille motor which I wanted I just didn't wanna get the falco motor. has anyone "shoe horned" a very abstract motor in a Mille yet?
like a Jap motor or maybe an Electric motor like the Killa Cycle?

Dropped valves!! confirmed I found bunch of pieces in my exhaust! one of them makes a valve with a pin on top the other one doesn't have the enough pieces to form a cats **** for crying out loud! lol so I opened the head gasket on the rear and I didn't see anything wrong where the heck am I suppose to look at? how hard is it to repair the old motor at this point, I got a 01 falco motor which I will be installing soon as soon as i can remove the last bolts off of the motor. how hard is it to repair my old 200 Rotax? what kinda damage would the dropped valves cause? thanks

how did you know i had about 9k miles? could i possibly install bigger valves while I'm at it to increase the perfomance? I already got another motor I just want to know how much it's going to cost me to get the old one fixed for spare.
is it possible to make 2000 mille motor gain more than 130hp with valves and maybe simple solution like dry nitro kit or maybe bigger valves? this is going to my project motor and I'm thinking about getting this fixed. how much would it cost me to get it fixed good? I could probably find old parts for about $200 USD from an old motor. how long does it take to fix it? should I change the valves on the front cylinder as well? thanks

_James_ said:

You would need at least a new cylinder, valves and piston for the damaged head. I've seen this a few times, in engines as low as 9k miles, that werent subject to over revving

Click to expand...

how did you know i had about 9k miles? could i possibly install bigger valves while I'm at it to increase the performance? I already got another motor I just want to know how much it's going to cost me to get the old one fixed for a spare.
is it possible to make 2000 mille motor gain more than 130hp with bigger valves and maybe simple solution like dry nitro kit or maybe bigger valves? this is going to my project motor and I'm thinking about getting this fixed. how much would it cost me to get it fixed good? I could probably find old parts for about $200 USD from an old motor. how long does it take to fix it? should I change the valves on the front cylinder as well? thanks
isn't the piston and the cylinder same? excuse my ignorance. thanks James

Quote:
Originally Posted by _James_ View Post
You would need at least a new cylinder, valves and piston for the damaged head. I've seen this a few times, in engines as low as 9k miles, that werent subject to over revving