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low compression in one cylinder,
- roccbottom
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- 1984 gpz1100, 1995 kz1000p
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- bountyhunter
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old rings? new rings? Oversize rings?and cylinder honing done
1979 KZ-750 Twin
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- porchev914
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- Whats that? Half of my swingarm is missing?!?!?
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FRANKEN Z!
1978 KZ1000 A2A with 08'Speed Triple SSSA and '06 GSXR1000 front end
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- roccbottom
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- 1984 gpz1100, 1995 kz1000p
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- larrycavan
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guys please help me out, heres the run down.had a valve job and cylinder honing done,valve adjustment and corrections done, valve timing set,carbs synced.added new spark plugs,and wires,Now after having no compression before getting the cams lined up correctly, set the cams to have the following numbers from the cylinders,#1-120 #2-100 #3-140 #4-150. added the cap full of oil,compression didn't change. so i tore the top half down once more.hoping to find something broken or out of place. no such luck.B.T.W/ it's my 84 GPz 1100. where should i begin looking? or is it just time to purchase another engine..
Are you saying you had the cams mistimed at one point?
Based on that "assumption" and the fact that oil didn't raise the PSI, I would suspect you may have tagged a valve in the low cylinder. Try pouring liquid in the ports and see if they leak.
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- BSKZ650
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what was causing it to shut down?
77 kz650, owned for over 25 years
77 ltd1000, current rider
76 kz900, just waiting
73 z1,, gonna restore this one
piglet, leggero harley davidson
SR, Ride captian, S.E.Texas Patriot Guard Riders.. AKA KawaBob
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- roccbottom
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- 1984 gpz1100, 1995 kz1000p
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- dshelly
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Occupation:Machinist 25+ exp.
'77 Kz1000B1
'78 Kz1000A2
'76 Kz900LTD
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- mark1122
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- Keep twisting it
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added the cap full of oil,compression didn't change. :
This would be a strong symptem of a poor valve seating. if u add oil u seal the rings, if compresion does not change, then u must suspect the valves. likely a bent valve or poor seat.
follow Lary's advice and check that the valve will hold penatrating oil.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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- roccbottom
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- 1984 gpz1100, 1995 kz1000p
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- TeK9iNe
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- What did you do!?!
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Make sure every valve is perfect, and with the head upside down, fill the valve area "bowls" with gasoline. If it leaks past a valve it will need to be lapped.
Install the head.
Cams must be installed/timed correctly and hand turn over motor slowly to ensure no valve/piston contact.
Your cams are probly fine.
If a shop did the work prior, demand a refund or the work be done properly.
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- bountyhunter
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Did they straight edge the head and cylinder surfaces to make sure they are not warped?okay guys, wiped out the bottom of the head. poured some wd 40 in each cylinder,nothing leaked out.just guessing here: but could my cams be bad?
1979 KZ-750 Twin
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