70 Cl350 Piston hitting Valve after rebuild

jtaylor1148

jtaylor1148

New Member
So I just recently had enough time to get my 350 engine back together, and for some reason the piston hits the valve (im guessing) and the engine will not rotate any further. The engine stops just short of the LF mark, and the cylinder wants to raise up off the crankcase, I have not tried to force anything at all, and have not cranked the engine over, could this be the way the camshaft was installed? I followed the manual the best I could, but could that be whats causing this?
 

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yup, check the cam timing again . . if my hazy memory serves me, put the left piston on tdc . . and make sure the cam gear mark is pointing the right direction . . my guess is thst you will find it to be off a few teeth.

if the cam mark is around 180 degrees out, you need to rotate the engine one more revolution.

if you loosen the valve adjustment all the way, it might allow you to turn it over but dont ever force it.
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Ahhh, sorry, did not quite get this section, the area that is circled in black is the section I am interested in, while circled in red is the part I do not quite grasp. Could you explain the "cutout of the cam sprocket rubber damper to the cam case mating surface by raising," and, "when assembling the cam sprocket on the camshaft, slightly raise the governor alignment pin on the camshaft from the right side and make the assembly." Because that bit tends to lose me, sorry if thats to much, just I dont quite catch what the manual is stating.
 

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ok, its been a zillion years since i have done this on your model so someone else will have a better answer, but for starters, the cam fear will likely have a rubber piece [circle] on the outside . . this rubber piece will have part of it cut off flat . . this flat piece most be horizontal to the seam between the head and the cam cover when the flywheel is on LF.

you can loosen the timing chain adjuster to do this but i think you will have to reset it . . i have no friggen idea what a "cam governor" is, but i can see if it is in one of the manuals i have shortly.

dohcbikes or another might be by soon and they will know.
 
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ok, you do not need to worry about the "governor pin" it is for the mechanical advance unit.

this flat spot in the rubber on the cam gear must be horizontal to the head and the cam lobes on the left side must be
facing down, not up . . this gear is rotated clockwise just a hair too much.

F0943426-44BB-44E2-9135-2791A0A681C1-6367-0000036C783AB13E.jpg
 
ahhhhhhh yesss, I see that now.Thank you very much. Let me buy you a bee....rr errrr I mean Pepsi, right, let me buy you a Pepsi.
 
jtaylor1148 said:
ahhhhhhh yesss, I see that now.Thank you very much. Let me buy you a bee....rr errrr I mean Pepsi, right, let me buy you a Pepsi.
Click to expand...

no prob . . keep us posted.

by the way...you can certainly buy me one of these if you like.

1310997898_1_FT0_jenniferengland.jpg
 
It's a good idea to check the TDC timing mark is actually at TDC., rotor can be fitted 60 degrees off which will really screw things up (looks like it is mounted in wrong holes in your picture - unless you took pic from a weird angle?)
This is pic from 350 manual
CB350%20rotor%20marks.png
 
Yea thats just the angle at which I took the picture, so problem is, after figuring it all out and lining it up, it still faces the same problem, engine spins freely, then again, wont turn anymore, this time, the L mark on the sprocket is down, and the LT on the rotor is on the index mark and I am all kinds of confused because I just lined the L up on the LT of the rotor, now, the engine is back on LT and wont spin, with L all the way down. Any thoughts on what is happening?
 
barnett468 said:
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ok, you do not need to worry about the "governor pin" it is for the mechanical advance unit.

this flat spot in the rubber on the cam gear must be horizontal to the head and the cam lobes on the left side must be
facing down, not up . . this gear is rotated clockwise just a hair too much.

F0943426-44BB-44E2-9135-2791A0A681C1-6367-0000036C783AB13E.jpg
Click to expand...




Okay, just for reference, by left side, which side do you mean?
 
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you can unbolt the cam gear then carefully rotate the engine with the spark plugs out it but make sure the chain doesnt get caught . . if it rotates, you are timing the cam wrong.

make sure it is in neutral.
 
So youre saying if the cam gear is unbolted and then the engine is spun, and the cam gear spins freely of the camshaft, that is wrong?
 
Sorry for the confusion, but, and you may not remember as you said its been a while since you have done anything pertaining to this but, and sorry for being a bit of an idiot to the whole camshaft timing thing. By left side of the engine do you mean the side with the tach cover, or the side with the ignition housing, because I feel like I may have things reversed in my head. Right now I took the valves out again, took both bolts out of the sprocket, and have just left the cam in and I am just going to start the whole process over.
 
Left side. As in the left side of the bike. So exhaust will face towards the front. Same as if you were sitting on it.

Barnett is trying to say if you take the bolts out of the cam gear you should be able to see if it is the valves causing the lock up or not.
 
Okay, thanks, exactly what I needed to know. One more thing, early, Barnett, also stated that the cam gear may be off by a few teeth, now, in order to fix that, do I just rotate the sprocket around to where it needs to be, or does, "off a few teeth," or that phrase I have heard of a cam gear skipping a tooth, do I need to separate the gear from the chain, and place it to the correct position on the chain?
 
OK this is getting a little out of hand in my opinion.

You said you took the valves out....How's that again? Did you remove the head for some reason? Maybe I'm not following what you are saying.

Your last post kinda makes me think you don't really understand the cam timing process.

With the cam chain disconnected from the cam gear

1. Correctly install the rotor per the manual. As pj mentions, take care not to misalign it.

2. Position the LT mark to align with the index on the stator. The left cylinder is now at top dead center. Make sure it stays there.

3. Position the damper cutout to the cam case mating surface as depicted in the manual.

4.Install the chain, keeping the front of the chain taught to ensure proper placement and timing.

5. BEFORE rotating the engine, check to see that the rotor and the cam sprocket are still in time.

That is all. Making it more complicated than that is unnecessary.


Another thing that can cause this is improperly adjusted valves, so be sure you understand that procedure as well.
 
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