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post #1 of 32 Old 08-18-2007, 3:37 AM Thread Starter
 
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valve adjustments...

ok so im geting the top end ready for a valve adjustment....

and i have the motor at TDC - the "t" is lined up...

now when im lookin at the camshafts - no mater how many times i turned the engine and realined the "t" - the IN/EX marks on the cam sprockets were not lining up the way they should have - was off by 1/4 of the cam at any givin time....

so i TDC again, remove the tenisioner, remove exhuast and then intake camshafts, put camshafts in the correct position, check all timing/position marks, torque it all back down, double check all the marks - im good to go...

i go to spin the motor...going clockwise...not even a full rotaion....camshafts dont wanna move. this is when #4 exhuast lobes are about to start opening the thier valves.....

by all means, i should be able to spin that engine with no probs.... is it possable the camshaft holder is torqued too tight?? its set for 12 n/m... or is there something im over looking?

i gotta make sure i cover everything...burned the camshafts on my 750 cuz they were too tight - thanks to a faulty toqure wrench which has sence been replaced.

any ideas?
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post #2 of 32 Old 08-18-2007, 6:34 AM
 
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Re: valve adjustments...

You put your valve timing out by 90 degrees when you realigned the cams and your valves are hitting your pistons. If the engine was running before you started the work, the valve timing was correct and your documentation may have been wrong. Double check everything, take your clearance measurement when the lobe is pointed 180 degrees from the top of the valve. This will ensure that you are on the base circle of the lobe. Also make sure that you are following the torque procedure on the cams, this is usually from the inside out in a criss cross pattern, and dont just torque the first bolt all the way down, put them all in a little at a time so you dont put too much stress on the cam. If the timing is out and you torqued down a cylinder that the piston was at TDC and the cam was opening the valves, you may have already bent a valve in the process. Look for any abnormally wide tolerances when you are checking the valves.

Last edited by gearhead14; 08-18-2007 at 7:10 AM. Reason: added information
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post #3 of 32 Old 08-18-2007, 8:12 AM Thread Starter
 
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Re: valve adjustments...

will check everything...and post back up with some pics so you can see what i see, a lil later this morning - the manuel is a lil confusing about the position the lobes are spossed to be
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post #4 of 32 Old 08-18-2007, 2:48 PM Thread Starter
 
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Re: valve adjustments...

ok, in the first post #4 is #1 - my bad...

but everything is still lined up the correct way, ive double checked all the marks......
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post #5 of 32 Old 08-18-2007, 2:58 PM Thread Starter
 
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Re: valve adjustments...

cam chain is off....and #3 is at TCD with the "t" mark lined up on the engine..
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post #6 of 32 Old 08-18-2007, 3:10 PM
 
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Re: valve adjustments...

Was it running before you moved the cams?
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post #7 of 32 Old 08-18-2007, 3:11 PM Thread Starter
 
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Re: valve adjustments...

yes....just needed a valve adjustment
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post #8 of 32 Old 08-18-2007, 3:14 PM
 
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Re: valve adjustments...

The valve timing is either correct or it's not, so if it was running you need to put the cams back where they were orignally. If they were off by 90 degrees then there is no possible way the engine would run... the the exhaust valve would be open during the intake stroke and the intake valve would be open during the compression stroke etc.
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post #9 of 32 Old 08-18-2007, 3:29 PM
 
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Re: valve adjustments...

any cylinder at tdc will either be on the end of the compression stroke or the end of the exhaust stroke. depending on which stroke, the cam lobes should either be pointing towards eachother but down about 45 degrees for the end of the exhaust stroke, or away from eachother up about 45 degrees for the compression stroke. You need to determine which stroke #3 is on and that will the the base for your valve timing. do not tighten the cams down unless one of these 2 cases is true. you can turn the motor with the valve train being out 180 degrees, but anything other than than that you greatly risk bending or breaking a valve. I'm not going to be on the computer for a while, take some pics and keep me posted, i'll be back later tonight.

Last edited by gearhead14; 08-18-2007 at 3:30 PM. Reason: speeeling
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post #10 of 32 Old 08-18-2007, 8:43 PM Thread Starter
 
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Re: valve adjustments...

all my notes from school are packed in the pod right now and i dont recall how to determine what part of the stroke the engine is in

so here is what im lookin at right now...

Last edited by skorpia; 04-01-2008 at 7:15 PM.
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post #11 of 32 Old 08-18-2007, 9:07 PM
 
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Re: valve adjustments...

can you post a pic from the front so i can see exactly where the cams are? and also a pic of the alignment mark on the crank. Thanks!
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post #12 of 32 Old 08-18-2007, 10:02 PM Thread Starter
 
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Re: valve adjustments...

yep - will have it up in a few
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post #13 of 32 Old 08-18-2007, 10:15 PM Thread Starter
 
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post #14 of 32 Old 08-18-2007, 10:19 PM
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Re: valve adjustments...

If your flags are all the same length you have numbers 1 and 4 at BDC and 2 & 3 at TDC.

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post #15 of 32 Old 08-18-2007, 10:33 PM
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Re: valve adjustments...

Those are better pics :-)
I don't have a manual for your bike but it _looks_ like you have the engine with 2 on TDC. Normally you want number 1 (opposite end to the sprockets) at TDC.
The marks on the crank trigger are in the wrong place.
The TDC mark is more likely the one next to the "T" I'd say. The non-sprocket end piston should then be at the top.

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