250 Compression Test - Honda Rebel Forum
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post #1 of 41 Old 06-01-2011, 08:11 PM Thread Starter
 
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250 Compression Test

You need a compression test gage.
-Warm the engine
-Remove both spark plugs and install the gage in place of a spark plug.
-Turn the petcock to off.
-Open the throttle ALL the way.
-Then press the starter button.
-Watch the gage until it stops rising. Compression should be 159psi or 11.2 kg/square cm or 1,100kPa for the second generation and for the first generation, 198 psi give or take 28 psi, 1,400/200 kPa, 14/2kg/cm2.
-Repeat for the other side.

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post #2 of 41 Old 06-02-2011, 07:36 AM
 
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Should also be mentioned that If you get a low reading, you can try adding a bit of oil in the cylinder. If that helps, then you probably got bad piston rings.

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post #3 of 41 Old 12-16-2011, 04:23 AM
 
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Quote:
Originally Posted by 88nightrider View Post
Should also be mentioned that If you get a low reading, you can try adding a bit of oil in the cylinder. If that helps, then you probably got bad piston rings.
is that engine oil or gas??

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post #4 of 41 Old 12-16-2011, 04:54 AM
 
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Engine oil. If you add a few drops of oil and the compression goes up it lets you know the rings are leaking. If not that means it could be the valves or head gasket.

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post #5 of 41 Old 12-19-2011, 01:06 AM
 
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what if i can't get hold of compressor gauge?
any other ideas???here mech shops are very low tech and Honda showroom doesn't touch other bikes than they sell.
Thumb test can be tricky....i found same pressure in both sides...what if both sides are low or high???

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post #6 of 41 Old 12-19-2011, 10:12 AM
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Holding your thumb over the spark plug hole instead of using a compression tester, isn't sensitive enough to detect significant pressure changes. To be accurate, you really need a gauge.

Here are a bunch on ebay: engine compression tester | eBay

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post #7 of 41 Old 12-19-2011, 08:02 PM
 
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O'Reilly Auto Supply test gauge kit $25.00 but you may have to purchase an additional adapter 10mm since their test gauge kit only goes down to 12mm. I believe the Rebel needs the 10mm spark plug adapter. I got the adapter from EBAY for $6.
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post #8 of 41 Old 12-19-2011, 08:04 PM
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Not sure O'Riley has expanded to Nepal yet.

Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #9 of 41 Old 12-20-2011, 12:08 AM
 
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Quote:
Originally Posted by flitecontrol View Post
Holding your thumb over the spark plug hole instead of using a compression tester, isn't sensitive enough to detect significant pressure changes. To be accurate, you really need a gauge.

Here are a bunch on ebay: engine compression tester | eBay
thanks for the link...it looks similar to the tire pressure checker...can i somehow modify the tire pressure gauge and make it work?? any ideas??and to order you need a credit card right?which i don't have we only use debit card which is applicable only through out Nepal and India!

any out of the box thinking?any ideas?

@humbegeo: it would be nice if i could get my hand to it!! thanks anyway man.

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post #10 of 41 Old 12-20-2011, 12:30 AM
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Do you have a Paypal account? You could pay that way.

I believe a dial type air pressure gauge will only read current pressure. As the valves open and close rapidly, the needle on the indicator dial would be moving too much to get a good reading.

Keepin' all the left over parts. Gonna use 'em to build another bike!

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