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Piston crown level?
Posted: Thu Jun 18, 2015 2:00 pm
by bryansmudge
After removing the exhaust to sort a different snag, I noticed that the top of the piston at BDC is still a touch proud of the exhaust port...by approx 1mm. The scoot has been running fine with the exception of a loose exhaust, when I built the engine I'm sure the piston was level with the port, but it was around 8 years ago...so memory not what it used to be. Obviously the exhaust port is being reduced because of this, so I have packers coming to sort that out. I'm using a 1-1.5mm head gasket to get the squish - I'm assuming just reduce the head gasket to suit? What about timing, will I need to reset that?
Re: Piston crown level?
Posted: Thu Jun 18, 2015 4:56 pm
by Minority
How was the piston in relation to the transfers, what cylinder is it (Standard cast, TS1, Imola etc etc), what crank (stroke/ conrod length) as I suspect all this could have a bearing on any advice given.
Re: Piston crown level?
Posted: Thu Jun 18, 2015 5:18 pm
by bryansmudge
Standard sized crank and rod, TS1 in standard form, Indian casings.
Re: Piston crown level?
Posted: Thu Jun 18, 2015 6:03 pm
by Muppet
leave as is
Re: Piston crown level?
Posted: Thu Jun 18, 2015 11:23 pm
by bryansmudge
Removed the cylinder head and one of the studs winds out, no probs me thinks. Stud winds out, but sticks, pull the cylinder off and low and behold there's a poxy thread repair been carried out at some point, which has now decided to let go. Where or who does timeserts? I have the capability to carry out the repair... Except welding.