Wanna play? Valves setting saga and other myths - Honda Rebel 300 & 500 Forum
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post #1 of 42 (permalink) Old 11-21-2018, 10:58 AM Thread Starter
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Wanna play? Valves setting saga and other myths

Sooo, 20000kms on odo, and my mechanic doesn't have time, so I'm on my own on this this year...
Oil was easy...


But air filter... holly smoke, from now on it will be changed on yearly base
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post #2 of 42 (permalink) Old 11-21-2018, 08:08 PM
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Yup, just a little dirty there
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post #3 of 42 (permalink) Old 11-22-2018, 04:43 AM Thread Starter
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And then, valves... if anybody tells you that it is easy and quick process, I told you, it is very time and nerve consumption, with no place to work. Most fun is with electrics under gas tank. Bucket of cables, relays and connectors is very hefty, pastic trays are hard to move... And you have to disconnect gas cables and clutch cable...
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post #4 of 42 (permalink) Old 11-22-2018, 04:50 AM Thread Starter
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And when you came to valve cover, one more thing, when unbolt cover itself and some kind of valve on top, you must drain coolant and take away upper rubber coolant hose, because cover will go off head only to the left side, on the right side are timing sprocket on the way...
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post #5 of 42 (permalink) Old 11-22-2018, 04:53 AM Thread Starter
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Sparks, it stays pretty life in them- I suppose and again... I don't see how a man would change them without all that mess- spark plug caps are very long, with very limited space???
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post #6 of 42 (permalink) Old 11-22-2018, 08:59 AM
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i've never put enough miles on a bike to change the spark plugs, this will be the first. those look like ones i've changed on a car with at least 50,000 miles, not just the 12,000 you've put on...
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post #7 of 42 (permalink) Old 11-22-2018, 03:36 PM Thread Starter
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Don't know on Yamaha they won't go much over 10000kms, and they not look very well at that mileage, only on Bimmer bokser machines they came out white and clean like new... So for now I would call it good, and machine didn't use a drop of oil between changes (messy air filter indicates somewhat oily motor, but draining hose was dry as well after 20000kms). It looks it's nature of beast, also according to someone posted even messier air filter at half less mileage
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post #8 of 42 (permalink) Old 11-22-2018, 03:41 PM Thread Starter
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And according to light tan color of spark plug insulator, these machines aren't running ridicolous lean, that is so common these days
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post #9 of 42 (permalink) Old 11-24-2018, 03:48 PM Thread Starter
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Ok, here's old vs new filter and filter housing- it is like new, even no dust inside...
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post #10 of 42 (permalink) Old 11-24-2018, 04:01 PM Thread Starter
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And now, back to valves.
Everybody, including dealer, told me it's not necessary to check valves, but me, ok, let's play, and boy it was so worth all the hassle! Why? It was very shocking experience, when discovered valves out of specs, intake especially. Numbers?
Intake side from chain to other side: 0,1mm , 0,1mm , 0,1mm , 0,08 or less mm and mfg specs 0,16 +/- 0,03mm!


Exhaust side, same order: all four 0,25mm mfg specs 0,27 +/-0,03mm


So, according to this it seems urgent to perform valves check at least at second service if not at first 12000kms! It's not likely that all will be in same boat, but I would not risk to ruin motor...
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