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Valkyrie Riders Cruiser Club > General > 1500 Tech Board > Compression testing question
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Author Topic: Compression testing question  (Read 635 times)
Scott Center
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Posts: 3
« on: March 21, 2015, 11:27:53 PM »
When perfoming a compression test, the manual says to open the throttle all the way while cranking the engine - if I do won't there be gas all over by the time I get to checking the fifth or sixth cylinders?
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bentwrench
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Posts: 760

Philadelphia,Pa.
« Reply #1 on: March 22, 2015, 05:19:01 AM »
Nope,WOT at cranking speed pulls much air than fuel,no accel pump to add fuel so crank away.
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matt
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Posts: 577

Derry New Hampshire
« Reply #2 on: March 22, 2015, 05:19:36 AM »
Does bike run? If so you could run till out of fuel, or drain carbs we used to disconnect fuel on carburetor.  Before fuel injected
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dpcarson
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Posts: 405


Lillington, NC
« Reply #3 on: March 22, 2015, 05:46:10 AM »
disconnect the spark plugs then it will not fire up.
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John Schmidt
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Posts: 15225


a/k/a Stuffy. '99 I/S Valk Roadsmith Trike

De Pere, WI (Green Bay)
« Reply #4 on: March 22, 2015, 07:14:48 AM »
As mentioned, these carbs don't have accelerator pumps to you're not pumping raw gas in with each twist of the throttle. Pull the plugs and have at it.
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indybobm
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Posts: 1601

Franklin, Indiana VRCC # 5258
« Reply #5 on: March 22, 2015, 08:18:27 AM »
According to the Honda Service Manual, it says to remove all plug wires and then remove one plug at at time to check compression. I have always removed all the plugs to let the engine spun faster when checking compression.
What do you guys do?
Do you agree with the manual?
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So many roads, so little time
VRCC # 5258
dpcarson
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Posts: 405


Lillington, NC
« Reply #6 on: March 22, 2015, 08:26:26 AM »
I only remove one plug at a time.  On every engine, outboards, inboards, car motors......  Always one plug out only.
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da prez
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Posts: 4361

. Rhinelander Wi. Island Lake Il.
« Reply #7 on: March 22, 2015, 08:39:23 AM »
  Racking the grey matter. One plug at a time will help find a blown head gasket  between cylinders.
  All plugs out will give a higher compression reading. All cylinders checked should be the same (approx) number of revolutions. There is also a wet test , putting oil in the cylinders , (just a squirt) to test the blow by in the rings. It has been a while and if I miss-stated , I am sure someone on this board will gently correct me.

                                          da prez
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