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Adjusting valves on a Honda Rebel 250

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As I continue to ride my 1986 Honda Rebel 250, I decided to check the valve gaps. In this video, follow along as I remove the valve cover, rotate the crank, and check the valve gaps. For the '86 Rebel, the manual states that both intake and exhaust valves should be .002". Check your manual for the proper gap!
Links to the tools I used:
Harbor Freight Feeler Gauge - www.harborfreight.com/feeler-...
Harbor Freight Impact Screwdriver - www.harborfreight.com/6-bit-i...
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27 сен 2021

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Комментарии : 20

@geraldscott4302 2 года назад

NEVER use power tools to remove or install the valve cover bolts. They will snap like toothpicks. I use large hardened washers held with Vise-Grips to remove those two plugs. Even then it is likely you will cause some damage to them. Very bad design by Honda. You don't really have to remove the top one, as there is another way to see if the cylinder is at TDC on the compression stroke for the valves you want to adjust. You will notice there is a square notch on the left end of the camshaft. Turn the crankshaft COUNTERCLOCKWISE until that square notch is pointed toward the back of the bike. One of the cylinders will be at TDC on the compression stroke. It could be either side. The rocker arms will be loose on that side. Go ahead and adjust those valves. Then turn the crankshaft one full revolution (which will be two full revolutions of the camshaft) putting the square notch back where it was, and you can adjust the valves for the other side. The book says 0.002-0.004 inches intake and exhaust (they are both the same) I use 0.003 inches. Before using the feeler gauge, I use some spray brake cleaner to clean the oil off the valve stems and adjusters, as it can interfere with the way the feeler gauge feels. After doing a valve adjustment, I start up the engine, warm it up, and change the oil.

@ificanfixitsocanyou 2 года назад

Eeek - good to know! I'm definitely overestimating the strength of these bolts and will use more caution going forward. Thank you for your tips on adjusting the valve clearance! One of the reasons for making this channel was to spread some knowledge, and I'm very lucky to have commenters providing their wealth of experience to help me learn even more! Thanks Gerald! (Be on the lookout for 1973 CB450 videos! These bikes are so much fun!)

@mrmark8603 9 месяцев назад

Thanks.

@thehashslingingslashertheh2439 Месяц назад

What exhaust does he have shoot

@dladalegmail 5 месяцев назад

Do you have more videos of the Honda 250? My AF adjuster broke, and I need to find a replacement and how to. Any suggestions?

@rondunlap4976 Год назад

If one intake rocker is all the way down the other should be in the middle of the camshaft base circle and good to adjust, and so on.

@shayanschmieder1589 2 года назад

In my 1985 Rebel manual it says to turn the crankshaft clockwise to set at TDC, however online im seeing many go counterclockwise ? is there a difference ? my rocker arm on the right side and exhaust valve is loose when at TDC meaning i have a bent valve?

@ificanfixitsocanyou 2 года назад

Interesting! I just checked the manual for the 1986 Rebel and it clearly states counterclockwise. (The PDF manual I have has instructions in English, French, and German and I'm referring to page 92). When the flywheel is at TDC, that means that ONE of the pistons is at TDC on its compression stroke. One way to ensure that the piston who's valve clearance you are adjusting is on it's compression stroke, is to first remove its spark plug. Then, place your thumb/finger over the spark plug hole and rotate the flywheel. You will feel air pressure pushing on your finger as the piston is rising for it's compression stroke. If you are at TDC and you felt no pressure, that means the piston was on it's exhaust stroke.

@geraldscott4302 Год назад

The engine runs counterclockwise (from the left) The problem with turning it clockwise (backwards) is that it can damage the cam chain. The cam chain needs to move over the tensioner in the proper direction. The rocker arms will be loose at TDC on the compression stroke, and tight at TDC on the exhaust stroke. Check the compression. If the valve is bent it will not seat properly, and the cylinder will not have any compression.

@adnanaliferozi2220 2 года назад

Which Guage number use in Intake and exhaust valve clearance guage ?

@ificanfixitsocanyou 2 года назад

For my 1986 Rebel, the manual states to use a .003" (three thousandths of an inch) clearance for both intake and exhaust. Double check your manual for the proper adjustment!

@adnanaliferozi2220 2 года назад

@@ificanfixitsocanyou you mean 003 0.08mm ??

@ificanfixitsocanyou 2 года назад

@@adnanaliferozi2220 Yep - 3 thousandths of an inch is about .08mm! (really .076mm) Again, double check your manual and your gauges for the correct specs.

@arcticgummibear4500 10 месяцев назад

Did you have to drain the oil to take off the lower access ports?

@ificanfixitsocanyou 10 месяцев назад

If by lower access port, you mean the one in the center (for the crankshaft), then no. I did not drain the oil before performing this work!

@eligames3794 2 года назад

So my exhaust from the head fell off And it was like the for like 2 weeks do think that could have messed up the valve And cause them to need hey valve adjustment

@eligames3794 2 года назад

@ificanfixitsocanyou 2 года назад

I don't think that would affect valve clearance. Did the exhaust rust off? Or the bolts fell out? Hope you can fix it soon!