minimum compression?

curt d · 07-04-2009, 02:03 PM

i have 1983 vf750 interceptor has 120psi compression is that to low to run?

CandyRedRC46 · 07-04-2009, 07:40 PM

is it even across all 4 cylinders?

mrich12000 · 07-04-2009, 08:13 PM

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So you took it apart. So did ya place the rings in the proper order on the piston?
The comp should be @ 170 and higher and uniform in all cyls. next Question is you did a deglase of the cyls?
Run the engine and do a breakin policy of up and down on the throtle keep the rpm below 5000 for the first 180 miles modulating the throtle up and down again . After all this redo the comp test to see if it had gone up to a normal range. Also do a wet test wth oil to se if the comp increas's -
Hope this helps (dam spell check is off)

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07-04-2009, 02:03 PM	#1 (permalink)
curt d Junior Member Join Date: Jul 2009 Last Online: 07-05-2009 12:33 PM Posts: 2 Thanks: 1 Thanked 0 Times in 0 Posts	minimum compression? i have 1983 vf750 interceptor has 120psi compression is that to low to run?

07-04-2009, 07:40 PM	#2 (permalink)
CandyRedRC46 Senior Member Join Date: Feb 2009 Last Online: Today 01:47 AM Location: Key West Florida My Ride: 2007 Honda VFR800 .... 1993 CB750 NightHawk View my Photo Gallery Posts: 869 Thanks: 80 Thanked 57 Times in 46 Posts	is it even across all 4 cylinders? __________________ + ZG ST, Heli's, Fender Eliminator, Throttlemeisser, Triangle Flip+Preload, BMC Filter. 200*Fan Switch, VTR Fan Blade - Snorkel, Flapper, Velocity Stacks. Pair Valves, and Evap Canister. Rounded off Entries to Throttle Bodies Motad Header and Two Brothers Exhaust Fully heat wrapped and sealed in high temp black Power Commander 3 USB & O2 Eliminators Custom Tune Done By AMR SUPERBIKES

07-04-2009, 08:13 PM	#3 (permalink)
mrich12000 Transit Union Join Date: May 2009 Last Online: Today 12:18 AM Location: Calgary, Alberta.Canada My Ride: 1984 !st Gen VF1000F 1990 K75 RT 1990 ZX R600 Ninga Posts: 141 Thanks: 79 Thanked 9 Times in 8 Posts	-------------------------------------------------------------------------------- So you took it apart. So did ya place the rings in the proper order on the piston? The comp should be @ 170 and higher and uniform in all cyls. next Question is you did a deglase of the cyls? Run the engine and do a breakin policy of up and down on the throtle keep the rpm below 5000 for the first 180 miles modulating the throtle up and down again . After all this redo the comp test to see if it had gone up to a normal range. Also do a wet test wth oil to se if the comp increas's - Hope this helps (dam spell check is off) __________________ Sliding into the corners at Monza Remember our Troops Royal Combat Engineers. ret Show your Ham Ticket VE 3 CEH

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