Question about 2002 Laverda Formula 750

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Valve guide seals for early 750 twins

Can you fit inlet valve guide seals from later 750 twins into the 1968 (small port motors) or are the guides different? Are they needed anyway?

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If you have guides allowing to fit them there should be no problem. There is only one type of 8mm guide seals for the whole 750s range. I think the original guides of early models didn’t have the possibility to fit them as they didn’t have a smaller diameter in that area. At those times many motocycles didn’t have them at all and it worked quite well I personally wouldn’t change the guides just for that. Aftermarket guides are only of the type that allows to fit the seals. ,,,

Posted on Nov 10, 2008

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1968 bonnie. Tried to start the bike this morning after putting it away for winter. Put the tappets down to provide fuel and the gas just started pouring out the tubes coming out of the carburetors.

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I have 83 750 magna carbs fouilin plugs

Hi, Anonymous and the usual suspects are:
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3. Piston rings badly worn or broken.
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Kawasaki zzr1100c what is the valve clearence

hi there,
this table will help you. I used to own one.. beautiful bikes easy to work on too!
Valve clearance: Inlet 0.13 0.19 mm
Exhaust 0.18 0.24 mm
Valve head thickness: Inlet 0.5mm 0.25 mm
Exhaust 0.8mm 0.5mm
Valve stem bend 0.05 mm TIR
Valve stem diameter: Inlet 4.975 4.990 mm 4.96 mm
Exhaust 4.955 4.970 mm 4.94 mm
Valve guide inside diameter 5.000 5.01 2 mm 5.08 mm
Valve/valve guide clearance
(wobble method): Inlet 0.02 0.07 mm 0.18 mm
Exhaust 0.06 0.11 mm 0.21 mm
Valve seating surface:
Outside diameter: Inlet 30.8 31.0 mm
Exhaust 26.3 26.5 mm
Width 0.5 1.0 mm
Valve spring free length: Inner 35.5 mm 33.6 mm
Outer 40.5 mm 38.6 mm
Valve seat cutting angle 32 degrees, 45 degrees, 60 degrees

Hope it helps.. Ken

Aug 18, 2014 | kawasaki ZZR 1100 Motorcycles

2 Answers

2002 ace shadow 750 with 2" cobra pipes. It has sat for a while, I am third owner. The front cylinder is smoking in first at take off, both plugs are black and are ngk 7. Even in neutral you can rev...

Check the mating surface where the head meets the cylinder. Bad oil stains on the cooling fins in this area would suggest a bad head gasket. Do a compression check. Chances are the rings are bad or frozen to the piston from a long period of storage. In any event, the head would need to come off for a repair. So go ahead and stick in new valve guide seals and have the valves re-seated.

Aug 18, 2011 | 2002 Honda VT 750 CD Shadow A.C.E. Deluxe

1 Answer

White smoke of the exhaust system why please

Constant smoke is bad piston rings. Smoking only when starting or pulling away from a stop sign is caused by bad valve guide seals. Below is a diagram of your engine. Please rate my answer. Thanks!

Nov 29, 2009 | 2002 Suzuki GSX-R 750

1 Answer

Oil in cylinder

Oil in the cylinders mean worn rings or worn valve stem seals. You can try a blow down test to see if it is rings - get an old spark plug and bust out the ceramic weld in a fitting to press with air and air up the cyl. if you here air in the crankcase you have worn rings. You just have to replace the valve guide seals no test there. 

Oct 29, 2009 | 1993 Yamaha YZF 750 R

1 Answer

How 2 adust clutch ,bike stalls when dropped into gear ,shift is quite clunky

The old design of slave cylinder (fitted to 2001 and prior bikes) wears badly leading to the unit drawing air in and ultimately loss of clutch action. A new seal usually cures things but the housing itself can wear too, so this might also need to be replaced. Alternatively the later, improved slave cylinder can be fitted, but this necessitates fitting of the later (longer) clutch pushrod. Or, try one of the many "LARGE" piston type slave cylinders that are available. These reduce the lever pressure by approx 30%.
Bleeding process is:
  • bleed valve closed
  • squeeze clutch
  • open bleed valve - clutch lever will come in to bar - hold it!
  • close bleed valve
  • release clutch
repeat till there are no more bubbles and operation is restored.

Jul 01, 2009 | 2001 Ducati 750 SS i.e. N-C

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