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 Post subject: Oil and valve adjustment
PostPosted: Tue Jan 09, 2018 6:10 pm 
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Joined: May 30, 2017
Motorcycle: 2000 Honda Rebel 250
Rebel: 250
Country: USA
State/Province: AZ
City: Tucson
Hi everyone. So I was doing a valve adjustment check. Good god was the clearance off! Anyways my question for you: should there be oil in this part of the engine? The entire area in there (where you make the adjustments)?

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 Post subject: Re: Oil and valve adjustment
PostPosted: Tue Jan 09, 2018 6:21 pm 
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Joined: Feb 23, 2009
Motorcycle: Rebel 250 plus a few others
Rebel: 250
Country: Canada
State/Province: NB
City: Fredericton
There should be some oil in the valve gallery area of the head, but there would not be a large pool of oil. When the engine is running, oil is being pumped up to the camshaft bearings and the rocker arm shafts to lubricate the cam and rockers. This oil flow is constantly running back down into the engine sump. Were you careful to check the valve clearance when the corresponding valve on the other cylinder is fully open? What clearance did you find?

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2004 Honda Rebel 250
2003 BMW K1200GT
2004 BMW R1200GS
1996 Ducati 900SS
1973 Norton 850 Interstate
1968 Triumph Bonneville


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 Post subject: Re: Oil and valve adjustment
PostPosted: Wed Jan 10, 2018 5:27 pm 
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Joined: May 30, 2017
Motorcycle: 2000 Honda Rebel 250
Rebel: 250
Country: USA
State/Province: AZ
City: Tucson
I’m not exactly sure what you mean by fully open. I did the procedure step by step based off of a video on YouTube by a fella named zeprider. I cranked until I got to top dead center and checked the left side. I couldn’t even get the slimmest feeler gauge in there (slimmer that .002). I adjusted those two until they were at .003. I then cranked the flywheel 180 degrees so that “the pac man” (as zeprider called it in the video) was facing the opposite direction and did the same for the right side.

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 Post subject: Re: Oil and valve adjustment
PostPosted: Wed Jan 10, 2018 10:25 pm 
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Joined: Feb 23, 2009
Motorcycle: Rebel 250 plus a few others
Rebel: 250
Country: Canada
State/Province: NB
City: Fredericton
The Rebel has a 360 degree crankshaft which means both cylinders are at top dead center at the same time. One cylinder will be just beginning its power stroke and the other will be just beginning its intake stroke. (4 180 degree strokes being intake,compression, power, exhaust) . You want to set the valves when both valves are closed between the compression and power strokes. The other cylinder will be about to start its intake stroke meaning both valves will be open (rocker arms down on the valve stem, no clearance)

I hope you meant you cranked the flywheel 360 degrees not 180 to check the other cylinder since the crank should be turned one full revolution.

Actually, its easier just to just set one valve when it's opposite number on the other cylinder is fully open (rocker all the way down on the valve stem). This guarantees the valve you are checking is in the midpoint of the round part of the cam (valve fully closed) . There is a wide margin of error on this since the cam is round for more than 180 degrees of its revolution so you don't need to worry about top dead center.

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2004 Honda Rebel 250
2003 BMW K1200GT
2004 BMW R1200GS
1996 Ducati 900SS
1973 Norton 850 Interstate
1968 Triumph Bonneville


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 Post subject: Re: Oil and valve adjustment
PostPosted: Wed Jan 17, 2018 12:59 am 
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Joined: Jul 4, 2009
Motorcycle: 2016 Honda Rebel
Rebel: 250
Country: USA
State/Province: AZ
City: Chandler
To get an idea of how it works, remove the cam cover, and turn the engine over with a socket. As it turns over, you will notice the rocker arms going up and down. You will notice they stay up for a while, then go down and stay down for awhile. The valves are closed when the rocker arm is UP. You can use the timing mark under the plug just above the plug you have to remove to turn the crankshaft, but it isn't necessary. Just turn the engine over a few times, watch how long the valves stay closed, and make sure you adjust them while they are fully closed. I set mine just a tiny bit loose, because as the valves and seats wear, the clearance tightens up.

If you are the least bit unsure about whether you did it right, do it over again. You can do some serious damage to the engine if you get them too tight, and out of 4 Rebels I've owned, I've never found the clearance to be way off.

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