Author Topic: REBUILD COMPRESSION  (Read 2219 times)

b s

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REBUILD COMPRESSION
« on: December 31, 2012, 11:49:19 PM »
HOW LOW DOES COMPRESSION HAVE TO BE TO BE REBUILD COMPRESSION ?

hoodlum

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Re: REBUILD COMPRESSION
« Reply #1 on: January 01, 2013, 08:44:14 AM »
There's no magic number since there are several things that effect the number reading....The bore size,altitude,any head work,etc. all effect the numbers...I know what mine usually runs on the normal,and if I see a 5psi drop,I know it's time for a rebuild....I would guess that for a 350,that number would probably be in the 125-130 range if it's stock....
Hoodlum

b s

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Re: REBUILD COMPRESSION
« Reply #2 on: January 01, 2013, 10:36:59 AM »
MY COMPRESSION IS AT 130 AND IM AT SEA LEAVAL

ENGINE IS ALL STOCK

hoodlum

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Re: REBUILD COMPRESSION
« Reply #3 on: January 01, 2013, 11:19:45 AM »
Manual says 138 psi....Have you checked it with another gauge to verify yours is accurate? Are you holding the throttle wide open when checking? How long have you owned the oddy? Have you noticed any changes in idle or hard starting? How long has it been since the last top end was done,or should I say,how much riding?

b s

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Re: REBUILD COMPRESSION
« Reply #4 on: January 01, 2013, 06:50:52 PM »
132 or 133 psi

Don't know how long ago it was rebuilt
« Last Edit: January 02, 2013, 01:56:53 AM by b s »

hoodlum

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Re: REBUILD COMPRESSION
« Reply #5 on: January 02, 2013, 05:39:13 AM »
132 or 133 psi

Don't know how long ago it was rebuilt

What are these numbers? Reading with another gauge?

LiveWire

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Re: REBUILD COMPRESSION
« Reply #6 on: January 02, 2013, 05:45:15 AM »
Pull the exhaust and look through the exhaust port at the intake side of the cylinder. It should have a cross hatch pattern. If it looks like a mirror, it is worn. If it has vertical grooves, it is worn.

odypilots

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Re: REBUILD COMPRESSION
« Reply #7 on: January 02, 2013, 07:41:03 AM »
I've seen 350s run with 100 psi, so some would say it's not rebuild time. It's up to the owner. I start thinking rebuild at a 10 lb drop.
The usual 'my two cents' disclaimer applies. :)