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

--------------------------------------------------------------------------------

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)

ChatBox (No new messages since your last visit)
Loading...
Message...
Ask your questions in the forums. The ChatBox is for small talk. Lamps to everyone!

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 02:49 PM Location: Key West Florida My Ride: 2007 Honda VFR800 .... 1993 CB750 NightHawk View my Photo Gallery Posts: 920 Thanks: 84 Thanked 60 Times in 49 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 01:54 PM Location: Calgary, Alberta.Canada My Ride: 1984 !st Gen VF1000F 1990 K75 RT 1990 ZX R600 Ninga Posts: 148 Thanks: 87 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

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Gas	smalls408	First & Second Generation 1983-1989	39	03-14-2009 12:02 PM
84 vf700 with low compression	John365	First & Second Generation 1983-1989	17	06-24-2008 08:21 PM
Fuel requirement	dskelton	Mechanics Garage	13	11-15-2006 04:45 AM
Suspension Setup	Les Halls	VF/VFR Mailing List	0	05-22-2006 06:38 AM