Tapatalk with the cell phone maybe? Attach the file after uploading.
This is unacceptable! Need to fix before the big trip.
Assessing the damage 08 650. no valve shims still does not clear within spec
So while doing my valve clearance on a new to me bike, it seems as though the front cylinder was especially friction-y. I measured 0 clearance.
When I took of the chain tensioner, the chain remained super tight, which made me think that possibly the Valves are really jammed against the camshaft.
Took off the camshaft journal and had to criss cross the screws for much longer than the rear head, the camshaft was really pressed tight against the journal. Pulled the tappet to check the numbers on the shim, noticed they were actually super worn and had lots of wear marks. Sounds like loose valve symptoms right? Well....
For kicks I reinstalled the tappets without any shims. Timed the chain and camshaft, reinstalled chain tensioner.
Turn over the crankshaft twice and measure clearance...not within spec sadly. Couldn't fit 0.10mm.
New valve time, right? Anything else this could be?
Bike runs "great" but the front head is noisy. Sounds slappy and has a loud ring to it upon startup
Mike
When I took of the chain tensioner, the chain remained super tight, which made me think that possibly the Valves are really jammed against the camshaft.
Took off the camshaft journal and had to criss cross the screws for much longer than the rear head, the camshaft was really pressed tight against the journal. Pulled the tappet to check the numbers on the shim, noticed they were actually super worn and had lots of wear marks. Sounds like loose valve symptoms right? Well....
For kicks I reinstalled the tappets without any shims. Timed the chain and camshaft, reinstalled chain tensioner.
Turn over the crankshaft twice and measure clearance...not within spec sadly. Couldn't fit 0.10mm.
New valve time, right? Anything else this could be?
Bike runs "great" but the front head is noisy. Sounds slappy and has a loud ring to it upon startup
Mike
81 - 90 of 90 Posts
This is unacceptable! Need to fix before the big trip.
Backpacker - Excellent points, and points I had not considered, at all. Thanks.
Corndog - Interesting comments, too. As I said, above, I imagine this (valves, cams, timing, etc.) thing is a world of its own.
Corndog - Interesting comments, too. As I said, above, I imagine this (valves, cams, timing, etc.) thing is a world of its own.
Most all modern engines rotate their valves. On "normal" duty engines this is normally done by either the grind angle on the cam, the angle/offset the cam or where the lifter contacts the valves. On these smaller, lighter valves it does take much to make them rotate. Even the valve spring windings can help induce a rotation. In a good engine the valves sort of "self lap" themselves while the engine is running. This prolongs the life of the valve face and seat as this action constantly pushes out any small particles like carbon between the parts. This rotation also insures a good match between the valve and the seat as well as helping to keep the valve interface at the seat and the guide at more even temperatures.
In heavy duty engines self rotating spring retainers are often added to insure a good "spin" on the bigger, heavier valves on these engines.
One of the things good techs look for in an engine is a nice circular wear pattern on the lifter or valve stem where the parts contact. This tells them the valve is rotating freely. When we see a straight wear pattern we want to take a closer look at the valve and guide as something is wrong and the valve is either failing or in danger of doing so due to lack of rotation.
In heavy duty engines self rotating spring retainers are often added to insure a good "spin" on the bigger, heavier valves on these engines.
One of the things good techs look for in an engine is a nice circular wear pattern on the lifter or valve stem where the parts contact. This tells them the valve is rotating freely. When we see a straight wear pattern we want to take a closer look at the valve and guide as something is wrong and the valve is either failing or in danger of doing so due to lack of rotation.
Some musing on cam flexing....
This usually is with multi cylinder inline engines (mainly I4). Cams that lift multiple valves over multiple cylinders can and will flex in operation. That's why when you are looking at where to position the cams to check the valve clearances they will not always have the lobe at 180 deg to the bucket - they take into account the affect of the other valves and sometimes the cam lobe position is like 150 or 120 deg from the bucket.
This usually is with multi cylinder inline engines (mainly I4). Cams that lift multiple valves over multiple cylinders can and will flex in operation. That's why when you are looking at where to position the cams to check the valve clearances they will not always have the lobe at 180 deg to the bucket - they take into account the affect of the other valves and sometimes the cam lobe position is like 150 or 120 deg from the bucket.
Here comes the "hater" post....If it's not broken yet that can still be "fixed" ( thank you corn dog...)😉This is an horror story of what can happen, when you are clueless and over confident, thinking you can do "anything" Sorry, couldn't help it, this really "ticked me off" Maybe I am a A-Hole? I never thought of myself as being one, but you never know; I am still learning about myself every day...😆....
Must be very handy to never make a mistake.Here comes the "hater" post....If it's not broken yet that can still be "fixed" ( thank you corn dog...)😉This is an horror story of what can happen, when you are clueless and over confident, thinking you can do "anything" Sorry, couldn't help it, this really "ticked me off" Maybe I am a A-Hole? I never thought of myself as being one, but you never know; I am still learning about myself every day...😆....
Where would we be if nobody ever tried to push the limits of their abilities or knowledge?
I was thinking the same thing. Providing unhelpful non-technical criticism belongs on bad TV drama. And it's only a piece of steel at risk for god's sake.Must be very handy to never make a mistake.
Where would we be if nobody ever tried to push the limits of their abilities or knowledge?
I'm really pushing for this guy to make it to Baja.
And back.I was thinking the same thing. Providing unhelpful non-technical criticism belongs on bad TV drama. And it's only a piece of steel at risk for god's sake.
I'm really pushing for this guy to make it to Baja.
Some of the best learning I have experienced, comes from failure. I started failing early and on cheap machines.Here comes the "hater" post....If it's not broken yet that can still be "fixed" ( thank you corn dog...)😉This is an horror story of what can happen, when you are clueless and over confident, thinking you can do "anything" Sorry, couldn't help it, this really "ticked me off" Maybe I am a A-Hole? I never thought of myself as being one, but you never know; I am still learning about myself every day...😆....
Personally, somebody who jumps in and tries…impresses me.
My tag line really refers to needless modifications.
Yes sorry; too many outlandish statements by the OP author....I came to think it must have been a Russian troll.... I took the hook, line and sinker! 😆
81 - 90 of 90 Posts
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