Quote:
Originally Posted by Maylands Performance  Hi Pitmaster.
The piston shows some scuffing at the top of the piston above the ring lands.It shouldnt show any contact at those points.Also the carbon deposits that normally build up a piston can be Eroded away in spots if an engine is suffering detonation.
Can you take a pic looking down on top of the piston crown.
It sounds like you have a possible pre-ignition/detonation problem from what you have said.
Things to check !!!
Check your piston ring gaps.Worn rings allow a piston to rock excessively in the cylinder bore,allowing the piston to rattle !!!!!
Have you changed/advanced the ignition timing at all ??
Have you made any jetting changes ?
Premium fuel will not cause engine problems in a low comp engine it is purely just a waste of $ The only damage is caused to the hip pocket
Cheers Brian |
Howdy Brian,
i havent changed ignition timing or anything like that,
only thing i did since its started is:
change to Premium fuel every tank,
changed airfilter from the enclosed Z50 black box type, to a open air pod filter,
the sparkplug is a perfect coffee brown colour, no oil deposits etc, looks perfect,
before i pulled the engine down, i checked compresion, and it was right in the middle of the spec sheet,
how is the ignition timing adjusted on these engines? could i try retarding it just a bees dick?
heres the pic,
Cheers Paul
