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Post by Curtis on Aug 3, 2017 18:31:33 GMT -5
Look for other issues. Clutch ? Kick start ? Mag ?
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Post by Walms on Aug 3, 2017 18:58:35 GMT -5
I'd explore that clicking sound. Worst case scenario is a trashed bearing cage.
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Post by givr on Aug 3, 2017 19:05:10 GMT -5
Where's the click coming from? Right side or left? Need to find that out. Check the plugs and piston tops for metal bouncing around. If a crank bearing cage has come apart you'll see it there and metal bits in the exhaust. Happened to me and Paul.
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Post by klnteg on Aug 3, 2017 19:32:44 GMT -5
Click comes from right side (clutch side) it's very faint... drained trans oil, I didn't see any metal filings. Didn't see a whole lot of metal trace on plugs either. Gonna pull clutch cover side next see if that clicking is in there.
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dickjny
2nd Gear
Wish the best to all my KTC, US & Canadian Triple rider friends! Dick J. - NY
Posts: 211
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Post by dickjny on Aug 4, 2017 5:16:43 GMT -5
- I once had a high pitch noise in my 1970 Yamaha R5 (transmission because it went away when I pulled in the clutch). I trailer it home and tore it down and found nothing. Put it back to gether and have now ridden it if for about 15 years without it doing it again. - Questions I'd ask myself ... Was you injection pump pumping to all cylinders? Could the piston have been hitting the head? Could a ring have contacted a port edge? ... Can't really thank of anything else, but good luck!
Dick J. - NY
Drag racer - If you can't win, make your competition set a new record!
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Post by zambia on Aug 4, 2017 7:03:44 GMT -5
Did you take the clutch cover off? It's not uncommon for aftermarket clutch plates to be a tad long and hit the inside of the cover.
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Post by givr on Aug 4, 2017 7:53:44 GMT -5
While you're at it. Make sure the pressure plate mark is lined up to the clutch hub mark.
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Post by klnteg on Aug 4, 2017 8:47:12 GMT -5
Guys thanks for all the suggestions honestly!!
Top end had 155-160psi compression before tearing down the top end. Top end looks just fine other than minor scoring on left piston. Barrels where good.
Removed clutch cover and found small amounts of metal findings but I cannot see where they are from inside the cover. I've inspected all around the clutch and crank gear and see no damage.
If it were crank bearings would it be obvious? When rotating the engine? The noise I heard was quite loud. My dad also heard it and suggested the top end tear down and inspect rod play. I'd hate to tear it all down for no reason...
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Post by Walms on Aug 4, 2017 10:24:32 GMT -5
Like Zambia said, sometimes you get some contact from clutch to cases. Another thing is to make sure the tach drive worm is still tight on the nose of the crank. Maybe worth to reassemble and take a short video, that might go along way for suggestions.
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Post by klnteg on Aug 4, 2017 11:26:02 GMT -5
Thanks walms...
I did just install a new tach cable. Before when it was running I didn't have a tach cable. I'm really hesitant that it's the crank bearings based on my findings so far.
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Post by pipe welder on Aug 4, 2017 13:57:01 GMT -5
Was it knocking while riding? High speed or low speed or only at idle? Loaded or coasting with no load? Constant or only intermittent?
Sometimes these things can help point to a possible issue.
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Post by klnteg on Aug 4, 2017 14:14:36 GMT -5
Knocking at idle but it happened while riding just heard it of a sudden then pulled over shut it off
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Post by pipe welder on Aug 4, 2017 14:36:14 GMT -5
Guys thanks for all the suggestions honestly!! Top end had 155-160psi compression before tearing down the top end. Top end looks just fine other than minor scoring on left piston. Barrels where good. Removed clutch cover and found small amounts of metal findings but I cannot see where they are from inside the cover. I've inspected all around the clutch and crank gear and see no damage. If it were crank bearings would it be obvious? When rotating the engine? The noise I heard was quite loud. My dad also heard it and suggested the top end tear down and inspect rod play. I'd hate to tear it all down for no reason... Sometimes things are never as obvious as we think they should be. You should verify that the small metal findings in the trans. are metal and not aluminium. Use a magnet if your not sure. If you remove the clutch or prime gear you can support the rods with some rags and rotate the crank without the transmission. That may help you determine if the crank is smooth and noise free. If the crank bearing cages were an issue you would think the pieces would have gone up to the pistons and made a mark of some kind as was mentioned. They obviously can't get in the transmission but there could possibly be a transmission bearing issue. Keep hunting. Your on the right track.
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Post by 650hardtail on Aug 5, 2017 11:06:00 GMT -5
pull your primary gear off the crank..it will isolate crank from trans for diagnosing the noise source
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Post by speedgeeza on Aug 6, 2017 18:54:42 GMT -5
This "click" noise... I have experienced numerous bearings where the surface of one of the balls has failed and a piece flaked off. Rotating the suspected shaft back and forth gave a faint click sound. But the noise whilst running was more of a deep rumble, with an increase of vibration.
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