Forum

[Dennis C]

I am sure you guys will correct me if I am wrong, but I understand that this bike doesn't have a pressure relief valve and the pump will lift off its seat and stop pumping when pressure is reached.

Even with a relief valve the excess oil will be bypassed so why fit the bigger pump?.

[Dean]

the bike has been fitted with the aftwermarket pressure relief valve. Looked up the tech notes on the rockers. The oil hole is currently 1/8th. Don't mean to show my ignorance, but how does this correlate with 2.5m. Alan recommended drilling out to 1/16th - but as mentioned the hole measures at 1/8th currently. Do you suppose someone already got in there and opened it up?

[Dean]

Alan - The tech notes describe drilling out the existing hole in the bottom of the rocker block. Are you recommending drilling a new hole in the top of the rocker cover? Should I just ream out the existing hole, as the tech notes describe or is there something else needs be done. Want to do all I can do to keep the top end from burning up like it did. Will try to download photos of the piston - its fried.
thanks

[Mark M]

Dean, if your top end is "burning up" resulting in a "fried" piston your problem isn't going to be solved by getting more oil to the rockers! Seriously, your problem is more likely to be carburation, ignition timing or possibly a tight piston/bore fit. Can you post pictures of the offending piston and the inside of the head showing valves?
REgards, Mark

[Dennis C]

As Mark says, you are on the wrong track with the oil pumps, ignition wrong or more likely running far too lean.

[PeteF]

Quite right, if the rockers weren't getting enough oil then the big end would complain first. On this design ALL the oil has to circulate via the rockers so if they don't get enough the big end doesn't either. (Unless it all leaks out somewhere)

[Alan R]

Hi DEAN------ Could you tell us if there are any variations from the bikes original standard specifications ?? .. As the others have indicated it shouldn't have done this without due reason.. Those photos will be a great help.......... 1/8" or (0.125 Inch) = 3.175 Millimetre(s)

[Midge]

Im rather loathe to get involved with an oil discussion as so many people have different views. However, I think there is general confusion between pressure and flow. The thicker the oil, generally the greater the pressure but with less flow and the visa versa. Unless the engine has been greatly modified and all components are not worn the standard set up is perfectly adequate. If there is a lubrication failure, something has failed, worn or not been maintained correctly. Its best to fix the problem and not the symptom. Mr H offers clear advice on what oils to use for each engine type, and I am not going to argue with him.