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New (to me!) '77 CB400F - US model
mattsz:
I don't know where this bike was ridden, but the gunge inside the sprocket cover is shocking - chain lube (I assume) flung everywhere, and dirt/sand/grit thickly mixed throughout! The cover wasn't too bad to clean, as it's removable... but the engine, still on the bike? What a mess! Same gunk that was all over the rear of the engine, swing arm, chain guard...
I must admit I'm surprised to see the sprocket mounting splines on the end of the shaft displaying surface rust - everything else is coated with crap, but it's clean and dry (and rusty). I guess chain lube gets thrown away from the shaft...
Before:
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After:
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Piles of crap scraped off:
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K2-K6:
--- Quote from: mattsz on July 20, 2020, 02:24:01 PM ---
--- Quote from: mattsz on July 16, 2020, 03:53:03 PM ---... is there a simple way of checking the action with the engine not running?
--- End quote ---
Anyone have any ideas about this?
--- End quote ---
If you uncinch the chain tensioner clamp bolt then put a telltale rod into the shaft hole, now put the bike in (take out the spark plugs first) gear and turn the rear wheel backwards, it should visibly push that rod out as the cam chain trys to deflect the tensioner and so rock the horseshoe backwards.
Then re tension if you turn the engine forward to pull the front chain run tight again, leaving the slack at the rear run for the tensioner to follow suit.
In essence the tensioner rod should go up and down when using opposing direction of crankshaft travel if left unlocked.
K2-K6:
Note;- you've only to turn the crank maybe 10 degree in either direction to see the above and not multiple rotation.
It's just to flip flop the excess play in the chain to front or rear orientation within the two runs inside the cylinder block.
mattsz:
Thanks K2-K6, that's helpful!
mattsz:
I followed your suggestion, K2-K6... there is upward movement of the "telltale" rod when I bump the engine backwards - but not much, maybe just a couple of millimeters... does this sound right? I don't know how much movement is ideal...
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