1) it was there last time and you didn't notice it. From the previous owner.
2) you are right, and it wasn't there last time.
Your screen should have most of the aluminum that was removed if (2) is the case.
I had the same thing happen when I used a 550 tensioner blade on a 650. It turns out it's a little shorter.
When I set it up, the CCT came up against the blade, but after running it, it slipped underneath it and started flapping about.
2) you are right, and it wasn't there last time.
Your screen should have most of the aluminum that was removed if (2) is the case.
I had the same thing happen when I used a 550 tensioner blade on a 650. It turns out it's a little shorter.
When I set it up, the CCT came up against the blade, but after running it, it slipped underneath it and started flapping about.
Joined Jan 2015
277 Posts | 157+
Winnipeg, Canada
Sorry to hear this happened. Is there a chance that the cam chain was picking up debris and "throwing" it into that area? Just a thought. Without a cam chain failure (or something else failing), this is quite bizarre. Does the affected area look like a clean break in the metal, or does it look worn away like a sand blaster? This might help determine if it was something large that hit it once, or some smaller pieces that hit it continuously. Also, is there any related damage on the down-side of the cam chain (if the chain threw possible particles downwards into the crankshaft gear)?
Surely that's a tensioner issue? It's possible that the tensioner ratchet has broken and is releasing and tightening back up. Have a look at the cam chain and see if it's damaged.
Joined Sep 2013
209 Posts | 79+
Poznan, Poland
The edge looks very harshly. I show you in next photo.
With this piece. I lost one tooth in gear on the water pump shaft.
CCT looks good. But I ordered a new one.
Joined Jan 2015
277 Posts | 157+
Winnipeg, Canada
Aluminum would be hard pressed to break a hardened steel tooth (pun intended).
I'm thinking that the tooth broke off and was thrown by the chain up into this piece, breaking off the chunk of aluminum. The F650 Part Out from Saskatchewan, Canada (the snow bike) that appears in the Classifieds section died from the same fat I believe.
Good thing your engine is salvageable from what you tell us.
Joined Jan 2015
277 Posts | 157+
Winnipeg, Canada
Yes, but if you use the stock breather hose on top of the engine (the one that vents to the frame), you may notice more oil going up the hose since this hole (absence of original shelf) won't block the oil spray coming off the cam chain.
In order to mitigate this, you could pinch off the rear breather tube, or reduce its size to slow the flow of oil up and out of the engine. Try to use a coat hanger or some thin steel rod to create a slight pinch like in the below photo. Just a thought. I was going to do this anyway on my engine since the rear breath hose contributes to the majority of the oil out of the engine apparently. Instead I used two stock foam filters in the breather hose (should reduce the amount of blow-by oil into the frame).
Joined Sep 2007
782 Posts | 291+
???
That area holds the tensioner in place, if you put
the tensioner in its place it comes flush with the top face
of the head, the rocker cover acts as a cap to help hold
the tensioner in place vertically.
It looks to me as if for some reason the tensioner was sticking
up a bit when the rocker cover was bolted down hence breaking
that piece out.
the tensioner in its place it comes flush with the top face
of the head, the rocker cover acts as a cap to help hold
the tensioner in place vertically.
It looks to me as if for some reason the tensioner was sticking
up a bit when the rocker cover was bolted down hence breaking
that piece out.
Joined Sep 2013
209 Posts | 79+
Poznan, Poland
Probably spanner won
I checked his theory and makes sense. Look at the pictures.
When the slide is vertical everything is good. But when you move to the side it extends beyond the head.
Probably he knocked into the metal until broke.
I have not found this piece of aluminum. Only small chips. Probably it has been milled through the gears
slide in normal position
slightly diagonally
I checked his theory and makes sense. Look at the pictures.
When the slide is vertical everything is good. But when you move to the side it extends beyond the head.
Probably he knocked into the metal until broke.
I have not found this piece of aluminum. Only small chips. Probably it has been milled through the gears
slide in normal position
slightly diagonally
Joined Jan 2015
277 Posts | 157+
Winnipeg, Canada
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